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1

DEVELOPMENT PLAN OF A SUSTAINABLE MICRO-HYDRO POWER PLANT AND DISTRIBUTION SYSTEM FOR A TRIBAL VILLAGE CLUSTER IN RURAL INDIA  

EPA Science Inventory

Columbia University Engineers Without Borders (CU-EWB) is developing a sustainable micro-hydro power plant for the Badi Trika Gouda village in the Indian state of Orissa. The community currently relies on firewood and animal waste matter for lighting and cooking. Our ...

2

A simplified propeller turbine runner design for stand alone micro-hydro power generation units  

Microsoft Academic Search

In most developing countries, the vast majority of potential micro-hydro power generation sites, i.e. with power outputs up to 100kW, are found in areas with high rainfall or extensive irrigation works with small canal drops. These sites, where the available head does not exceed 5m, are usually referred to as low head sites. The present paper introduces a simplified design

G. M. Demetriades; A. A. Williams; N. P. A. Smith

1996-01-01

3

Installation and practical operation of the first micro hydro power system in Taiwan using irrigation water in an agriculture canal  

Microsoft Academic Search

This paper presents the design, installation, and field-measurement results of the first micro hydro power (MHP) generation system in Taiwan. This MHP prototype employs the irrigation water flowing in one of the irrigation canals of Yunlin irrigation association of Taiwan. Since the primary function of the irrigation canal is to distribute irrigation water to farmlands, the designed MHP must meet

Li Wang; Dong-Jing Lee; Jian-Hong Liu; Zan-Zia Chen; Zone-Yuan Kuo; Huei-Yuan Jang; Jiunn-Ji You; Jin-Tsang Tsai; Ming-Hua Tsai; Wey-Tau Lin; Yeun-Jong Lee

2008-01-01

4

Decentralized Micro-hydro Energy Systems in Nepal: En Route to Sustainable Energy Development  

Microsoft Academic Search

At present, 85 percent of Nepalese people live in remote areas with limited access to energy except fuel wood and other biomass for their energy source. This article examines the sustainable energy projects, considering socioeconomic conditions of the country. In this study, it is revealed that micro-hydro operations in remote\\/isolated areas are considered to be one of the most feasible

G. R. Pokharel; A. B. Chhetri; M. I. Khan; M. R. Islam

2008-01-01

5

Idaho Micro Hydro Handbook  

Microsoft Academic Search

This handbook addresses the development of micro-hydroelectric systems. An overview of microhydro systems, methods for determining site feasibility and guidance in system design are provided. The technology is well developed and equipment is available from a variety of sources. By following the steps outlined here, the site developer will be able to move through the site development process. The basic

J. Volkman; B. Eastlake

1983-01-01

6

Idaho Micro Hydro Handbook.  

National Technical Information Service (NTIS)

This handbook addresses the development of micro-hydroelectric systems. An overview of microhydro systems, methods for determining site feasibility and guidance in system design are provided. The technology is well developed and equipment is available fro...

J. Volkman B. Eastlake

1983-01-01

7

Idaho Micro Hydro Handbook  

SciTech Connect

This handbook addresses the development of micro-hydroelectric systems. An overview of microhydro systems, methods for determining site feasibility and guidance in system design are provided. The technology is well developed and equipment is available from a variety of sources. By following the steps outlined here, the site developer will be able to move through the site development process. The basic information presented here is not intended to answer all the questions a developer may have. The reference section in the back will guide those in need to additional information.

Volkman, J.; Eastlake, B.

1983-01-01

8

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana, First Annual Progress Report (Covering Field Season July-November 1982).  

SciTech Connect

This fisheries study is to determine the potential cumulative biological and economic effects of 20 small or micro-hydro-electric facilities (less than 5 megawatts) proposed to be constructed on tributaries to the Swan River, a 1738 square kilometer (671 square mile) drainage located in northwestern Montana. The study addresses portions of measure 1204 (b) (2) of the Norwthwest Power Planning Council's Columbia River Basin Fish and Wildlife Program. Aerial pre-surveys conducted during 1982 identified 102 stream reaches that may support fish populations in the Swan drainage between Swan and Lindbergh lakes. These reaches were located in 49 tributary streams and constituted 416 kilometers (258 miles) of potential fish habitat. Construction of all proposed small hydro projects would divert water from 54 kilometers (34 miles) or about 13 percent of the tributary system. Only two of the 20 proposed hydro sites did not support trout populations and most were populated by migratory bull trout and westslope cutthroat trout. Potential cumulative habitat losses that could result from dewatering of all proposed project areas were predicted using a stream reach classification scheme involving stream gradient, drainage ara, and fish population data. Preliminary results of this worst case analysis indicate that 23, 19 and 6 percent of the high quality rearing habitat for cutthroat, bull, and brook trout respectively would be lost.

Leathe, Stephen A.; Graham, Patrick J.

1984-03-01

9

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana. First Annual Progress Report (Covering Field Season July-November 1982).  

National Technical Information Service (NTIS)

This fisheries study is to determine the potential cumulative biological and economic effects of 20 small or micro-hydro-electric facilities (less than 5 megawatts) proposed to be constructed on tributaries to the Swan River, a 1738 square kilometer (671 ...

P. J. Graham S. A. Leathe

1983-01-01

10

Micro-hydro water current turbine control for grid connected or islanding operation  

Microsoft Academic Search

This paper deals with the up-to-date issue of renewable energy production systems. For their exploitation these systems need advanced integrated controls that include power electronics facilities. A study of a micro- hydro water turbine based energy production system is presented. This study is oriented on controlling the micro- hydro generation system in grid-connected and in islanded operation. For each of

M. Andreica; S. Bacha; D. Roye; I. Exteberria-Otadui; I. Munteanu

2008-01-01

11

Experimental optimization of a free vortex propeller runner for micro hydro application  

Microsoft Academic Search

The turbine technology for low head application in the micro hydro range has been vastly neglected despite niche available in scattered regions of valley flows as well as in wastewater canals and other energy recovery schemes, where the available head does not exceed 2 meters. The goal of this study is to develop hydraulically optimized propeller turbines for the micro

Punit Singh; Franz Nestmann

2009-01-01

12

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana. Volume I. Summary Report. Final Report.  

National Technical Information Service (NTIS)

This study was designed to develop and apply methods to evaluate the cumulative effects of 20 proposed small hydro projects on the fisheries resources of the Swan River drainage located in northwestern Montana. Fish population and reach classification inf...

S. A. Leathe M. D. Enk

1985-01-01

13

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana. Volume 2. Technical Information. Final Report, 1985.  

National Technical Information Service (NTIS)

This report summarizes a study to determine the potential cumulative effects of proposed small hydro development on the fisheries of the Swan River drainage. This report contains technical information and is a support document for the main report (Leathe ...

S. A. Leathe S. Bartelt L. M. Morris

1985-01-01

14

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana. 3. Fish and Habitat Inventory of Tributary Streams. Final Report.  

National Technical Information Service (NTIS)

This report summarizes a study of the fisheries of the Swan River drainage in relation to potential small hydro development. This information was collected in order to obtain a reliable basin-wide database which was used to evaluate the potential cumulati...

S. A. Leathe S. Bartelt L. M. Morris

1985-01-01

15

Cumulative Effects of Micro-Hydro Development on the Fisheries of the Swan River Drainage, Montana, Volume II, Technical Information, 1983-1984 Final Report.  

SciTech Connect

This report summarizes a study to determine the potential cumulative effects of proposed small hydro development on the fisheries of the Swan River drainage. This report contains technical information and is a support document for the main report (Leathe and Enk, 1985). Consequently, discussion of results was minimized. The sections on fish population monitoring, streambed monitoring, habitat survey comparisons, and water temperature are the only portions that were not discussed in the main report. 5 refs., 55 figs., 44 tabs.

Leathe, Stephen A.

1985-07-01

16

Self-Excited Induction Generator for Micro-Hydro Plants Using Water Current Turbines Type  

Microsoft Academic Search

A study of a micro-hydro run-of-the-river project using a squirrel cage induction generator is presented. A water current turbine, propeller type, is considered. A three-phase voltage source inverter is used to establish with deadbeat control on the AC side, the required currents to excite the generator. A DC control loop with PI controller is used to maintain the DC bus

J. Faria; E. Margato; M. J. Resende

2005-01-01

17

Designs and Applications for Floating-Hydro Power Systems in Small Streams.  

National Technical Information Service (NTIS)

The project focuses on an appropriate technology for small-scale hydro power: floating waterwheels and turbines. For background, relic and existing systems such as early floating mills, traditional Amish waterwheels, and micro-hydro systems are examined. ...

J. B. Rehder

1983-01-01

18

Heatpipe power system development  

SciTech Connect

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The objective of the project was to develop a design approach that could enable the development of near-term, low-cost, space fission-power systems. Sixteen desired attributes were identified for such systems and detailed analyses were performed to verify that they are feasible. Preliminary design work was performed on one concept, the Heatpipe Power system (HPS). As a direct result of this project, funding was obtained from the National Aeronautics and Space Administration to build and test an HPS module. The module tests went well, and they now have funding to build a bimodal module.

Houts, M.G.; Poston, D.I.

1998-12-31

19

Power Systems Development Facility  

SciTech Connect

This report discusses Test Campaign TC12 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (SW) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using a particulate control device (PCD). While operating as a gasifier, either air or oxygen can be used as the oxidant. Test run TC12 began on May 16, 2003, with the startup of the main air compressor and the lighting of the gasifier start-up burner. The Transport Gasifier operated until May 24, 2003, when a scheduled outage occurred to allow maintenance crews to install the fuel cell test unit and modify the gas clean-up system. On June 18, 2003, the test run resumed when operations relit the start-up burner, and testing continued until the scheduled end of the run on July 14, 2003. TC12 had a total of 733 hours using Powder River Basin (PRB) subbituminous coal. Over the course of the entire test run, gasifier temperatures varied between 1,675 and 1,850 F at pressures from 130 to 210 psig.

None

2003-07-01

20

Power Systems Development Facility  

SciTech Connect

This report discusses Test Campaign TC15 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Power Generation, Inc. (SPG) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or gasifier using a particulate control device (PCD). While operating as a gasifier, either air or oxygen can be used as the oxidant. Test run TC15 began on April 19, 2004, with the startup of the main air compressor and the lighting of the gasifier startup burner. The Transport Gasifier was shutdown on April 29, 2004, accumulating 200 hours of operation using Powder River Basin (PRB) subbituminous coal. About 91 hours of the test run occurred during oxygen-blown operations. Another 6 hours of the test run was in enriched-air mode. The remainder of the test run, approximately 103 hours, took place during air-blown operations. The highest operating temperature in the gasifier mixing zone mostly varied from 1,800 to 1,850 F. The gasifier exit pressure ran between 200 and 230 psig during air-blown operations and between 110 and 150 psig in oxygen-enhanced air operations.

Southern Company Services

2004-04-30

21

New developments in power semiconductors  

NASA Technical Reports Server (NTRS)

This paper represents an overview of some recent power semiconductor developments and spotlights new technologies that may have significant impact for aircraft electric secondary power. Primary emphasis will be on NASA-Lewis-supported developments in transistors, diodes, a new family of semiconductors, and solid-state remote power controllers. Several semiconductor companies that are moving into the power arena with devices rated at 400 V and 50 A and above are listed, with a brief look at a few devices.

Sundberg, G. R.

1983-01-01

22

POWER SYSTEMS DEVELOPMENT FACILITY  

SciTech Connect

This report discusses test campaign GCT3 of the Halliburton KBR transport reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The transport reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using one of two possible particulate control devices (PCDs). The transport reactor was operated as a pressurized gasifier during GCT3. GCT3 was planned as a 250-hour test run to commission the loop seal and continue the characterization of the limits of operational parameter variations using a blend of several Powder River Basin coals and Bucyrus limestone from Ohio. The primary test objectives were: (1) Loop Seal Commissioning--Evaluate the operational stability of the loop seal with sand and limestone as a bed material at different solids circulation rates and establish a maximum solids circulation rate through the loop seal with the inert bed. (2) Loop Seal Operations--Evaluate the loop seal operational stability during coal feed operations and establish maximum solids circulation rate. Secondary objectives included the continuation of reactor characterization, including: (1) Operational Stability--Characterize the reactor loop and PCD operations with short-term tests by varying coal feed, air/coal ratio, riser velocity, solids circulation rate, system pressure, and air distribution. (2) Reactor Operations--Study the devolatilization and tar cracking effects from transient conditions during transition from start-up burner to coal. Evaluate the effect of process operations on heat release, heat transfer, and accelerated fuel particle heat-up rates. Study the effect of changes in reactor conditions on transient temperature profiles, pressure balance, and product gas composition. (3) Effects of Reactor Conditions on Syngas Composition--Evaluate the effect of air distribution, steam/coal ratio, solids circulation rate, and reactor temperature on CO/CO{sub 2} ratio, H{sub 2}/converted carbon ratio, gasification rates, carbon conversion, and cold and hot gas efficiencies. Test run GCT3 was started on December 1, 2000, with the startup of the thermal oxidizer fan, and was completed on February 1, 2001. This test was conducted in two parts; the loop seal was commissioned during the first part of this test run from December 1 through 15, which consisted of hot inert solids circulation testing. These initial tests provided preliminary data necessary to understand different parameters associated with the operation and performance of the loop seal. The loop seal was tested with coal feed during the second part of the test run and additional data was gathered to analyze reactor operations and to identify necessary modifications to improve equipment and process performance. In the second part of GCT3, the gasification portion of the test, from January 20 to February 1, 2001, the mixing zone and riser temperatures were varied between 1,675 and 1,825 F at pressures ranging from 200 to 240 psig. There were 306 hours of solid circulation and 184 hours of coal feed attained in GCT3.

Unknown

2002-05-01

23

"Word Power" (Vocabulary Development).  

ERIC Educational Resources Information Center

Containing numerous vocabulary-building activities and exercises, this guidebook is designed to help elementary students learn to manipulate language as they gain concrete experiences with words, increase their "word power," and have fun. The activities described involve dictionary games, synonyms, "saidonyms" (alternatives for the overused word…

Voorhees, Roxy

24

An overview of renewable energy technologies with a view to stand alone power generation and water provision  

Microsoft Academic Search

A brief overview is provided of renewable energy technologies suited to stand alone power generation; in practice this means wind turbines and photovoltaics (PV) as these can be used in diverse locations, and to a lesser extent micro-hydro which is more site specific and bio-energy although this last one may not be effective at the smaller scales mostly involved. The

D. G. Infield

2009-01-01

25

Nanosatellite electrical power system development  

NASA Astrophysics Data System (ADS)

Nanosatellites have the potential to carry out the complex work of today's larger satellites at a fraction of the cost. Their small designs drastically reduce launch costs and allow many research projects and technology demonstration missions to be flown. The development of small satellites has created a need for smaller, lightweight electrical power systems (EPS) without compromising the power capacity. This thesis focuses on the electrical power system of the YUsend-1 mission. The work carried out in designing and developing the EPS for the YUsend mission utilizing commercial technologies is outlined. Mission modes are developed and a power budget is assigned for the different subsystems setting a baseline for how much power is needed. Different battery chemistries are analyzed in order to find a type that would suit the needs of the YUsend program. Commercially available batteries are put through space environment testing and the results are presented. The fabrication, testing, and space qualification results of solar panels using Triangular Advanced Solar Cells (TASCs) are also presented. Lastly the layout for the distribution board is developed.

Navarathinam, Nimal

26

High voltage power transistor development  

NASA Technical Reports Server (NTRS)

Design considerations, fabrication procedures, and methods of evaluation for high-voltage power-transistor development are discussed. Technique improvements such as controlling the electric field at the surface and perserving lifetimes in the collector region which have advanced the state of the art in high-voltage transistors are discussed. These improvements can be applied directly to the development of 1200 volt, 200 ampere transistors.

Hower, P. L.

1981-01-01

27

Nanosat Intelligent Power System Development  

NASA Technical Reports Server (NTRS)

NASA Goddard Space Flight Center is developing a class of satellites called nano-satellites. The technologies developed for these satellites will enable a class of constellation missions for the NASA Space Science Sun-Earth Connections theme and will be of great benefit to other NASA enterprises. A major challenge for these missions is meeting significant scientific- objectives with limited onboard and ground-based resources. Total spacecraft power is limited by the small satellite size. Additionally, it is highly desirable to minimize operational costs by limiting the ground support required to manage the constellation. This paper will describe how these challenges are met in the design of the nanosat power system. We will address the factors considered and tradeoffs made in deriving the nanosat power system architecture. We will discuss how incorporating onboard fault detection and correction capability yields a robust spacecraft power bus without the mass and volume penalties incurred from redundant systems and describe how power system efficiency is maximized throughout the mission duration.

Johnson, Michael A.; Beaman, Robert G.; Mica, Joseph A.; Truszkowski, Walter F.; Rilee, Michael L.; Simm, David E.

1999-01-01

28

Plastic Laminate Pulsed Power Development  

SciTech Connect

The desire to move high-energy Pulsed Power systems from the laboratory to practical field systems requires the development of compact lightweight drivers. This paper concerns an effort to develop such a system based on a plastic laminate strip Blumlein as the final pulseshaping stage for a 600 kV, 50ns, 5-ohm driver. A lifetime and breakdown study conducted with small-area samples identified Kapton sheet impregnated with Propylene Carbonate as the best material combination of those evaluated. The program has successfully demonstrated techniques for folding large area systems into compact geometry's and vacuum impregnating the laminate in the folded systems. The major operational challenges encountered revolve around edge grading and low inductance, low impedance switching. The design iterations and lessons learned are discussed. A multistage prototype testing program has demonstrated 600kV operation on a short 6ns line. Full-scale prototypes are currently undergoing development and testing.

ALEXANDER,JEFF A.; SHOPE,STEVEN L.; PATE,RONALD C.; RINEHART,LARRY F.; JOJOLA,JOHN M.; RUEBUSH,MITCHELL H.; CROWE,WAYNE; LUNDSTROM,J.; SMITH,T.; ZAGAR,D.; PRESTWICH,K.

2000-09-01

29

Wind, Sun and Water: Complexities of Alternative Energy Development in Rural Northern Peru  

ERIC Educational Resources Information Center

Drawing on recent research with NGO-driven projects in rural Cajamarca, Peru, we examine the paradoxes of relying on wind, solar and micro-hydro generation of electricity for rural community development. In spite of cost, vagaries of these energy resources and limited material benefits, especially with wind and solar systems, villagers are eagerly…

Love, Thomas; Garwood, Anna

2011-01-01

30

Renewable Energy for Sustainable Rural Village Power  

SciTech Connect

It is estimated that two billion people live without electricity and its services worldwide. In addition, there is a sizeable number of rural villages that have limited electrical service, with either part-day operation by diesel generator or partial electrification. For many villages connected to the grid, power is often sporadically available and of poor quality. The US National Renewable Energy Laboratory (NREL) in Golden, Colorado, has initiated a program that involves hybrid systems, to address these potential electricity opportunities in rural villages through the application of renewable energy technologies.1 The objective of this program is to develop and implement applications that demonstrate the technical performance, economic competitiveness, operational viability, and environmental benefits of renewable rural electric solutions, compared to the conventional options of line extension and isolated diesel mini-grids. Hybrid systems are multi-disciplinary, multi-technology, multi-application programs composed of six activities, including village applications development, computer model development, systems analysis, pilot project development, technical assistance, and Internet-based village power project data base. While the current program emphasizes wind, photovoltaics (PV), and their hybrids with diesel generator, micro-hydro and micro-biomass technologies may be integrated in the future. Thirteen countries are actively engaged in hybrid systems for rural and remote applications and another dozen countries have requested assistance in exploring wind/PV hybrid systems within their territories. At present rural/remote site application of renewable technologies is the fastest growing aspect of renewable energy worldwide.

Touryan, J. O. V.; Touryan, K. J.

1999-08-05

31

Role of nuclear power in the Philippine power development program  

SciTech Connect

The reintroduction of nuclear power in the Philippines is favored by several factors such as: the inclusion of nuclear energy in the energy sector of the science and technology agenda for national development (STAND); the Large gap between electricity demand and available local supply for the medium-term power development plan; the relatively lower health risks in nuclear power fuel cycle systems compared to the already acceptable power systems; the lower environmental impacts of nuclear power systems compared to fossil fuelled systems and the availability of a regulatory framework and trained personnel who could form a core for implementing a nuclear power program. The electricity supply gap of 9600 MW for the period 1993-2005 could be partly supplied by nuclear power. The findings of a recent study are described, as well as the issues that have to be addressed in the reintroduction of nuclear power.

Aleta, C.R. [Philippine Nuclear Research Institite, Quezon City (Philippines)

1994-12-31

32

X2000 power system electronics development  

NASA Technical Reports Server (NTRS)

The X2000 Power System Electronics (PSE) is a Jet Propulsion Laboratory (JPL) task to develop a new generation of power system building blocks for potential use on future deep space missions. The effort includes the development of electronic components and modules that can be used as building blocks in the design of generic spacecraft power systems.

Carr, Greg; Deligiannis, Frank; Franco, Lauro; Jones, Loren; Lam, Barbara; Nelson, Ron; Pantaleon, Jose; Ruiz, Ian; Treichler, John; Wester, Gene; Sauers, Jim; Giampoli, Paul; Haskell, Russ; Mulvey, Jim; Repp, John

2005-01-01

33

25 CFR 137.6 - Power development.  

Code of Federal Regulations, 2011 CFR

...Section 137.6 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR FINANCIAL ACTIVITIES REIMBURSEMENT OF CONSTRUCTION COSTS, SAN CARLOS INDIAN IRRIGATION PROJECT, ARIZONA § 137.6 Power development. The cost of the power...

2011-04-01

34

Renewables for sustainable village power  

SciTech Connect

It is estimated that two billion people live without electricity and its services. In addition, there is a sizeable number of rural villages that have limited electrical service, with either part-day operation by diesel gen-sets or partial electrification (local school or community center and several nearby houses). For many villages connected to the grid, power is often sporadically available and of poor quality. The U.S. National Renewable Energy Laboratory (NREL) in Golden, Colorado, has initiated a program to address these potential electricity opportunities in rural villages through the application of renewable energy (RE) technologies. The objective of this program is to develop and implement applications that demonstrate the technical performance, economic competitiveness, operational viability, and environmental benefits of renewable rural electric solutions, compared to the conventional options of line extension and isolated diesel mini-grids. These four attributes foster sustainability; therefore, the program is entitled Renewables for Sustainable Village Power (RSVP). The RSVP program is a multi-technology, multi-application program composed of six activities, including village applications development, computer model development, systems analysis, pilot project development, technical assistance, and Internet-based village power project data base. While the current program emphasizes wind, photovoltaics (PV), and their hybrids with diesel gen-sets, micro-hydro and micro-biomass technologies may be integrated in the future. NREL`s RSVP team is currently involved in rural electricity projects in thirteen countries, with U.S., foreign, and internationally based agencies and institutions. The integration of the technology developments, institutional experiences, and the financial solutions for the implementation of renewables in the main line rural electrification processes in both the developing world and remote regions of the developed world is the goal.

Flowers, L.

1997-03-01

35

PEM fuel cell utility power plant development  

Microsoft Academic Search

Summary form only given as follows. Development of fuel cell power plants for utility applications has been the major thrust of this technology over the years. Phosphoric acid fuel cell power plants have been the first to be placed in field demonstrations and to be offered as commercial products. Molten carbonate and solid oxide fuel cell power plants have been

J. R. Huff; D. S. Watkins; R. Cohen

1994-01-01

36

Developments in Electric Power Transmission  

Microsoft Academic Search

A brief account of some significant events in the history of electric power transmission related by a past-president of the Institute whose name is closely linked with many of those events and who for many years has been actively engaged in the study of high voltage phenomena.

Harris J. Ryan

1934-01-01

37

Development of YBCO power devices in Japan  

NASA Astrophysics Data System (ADS)

A new Japanese national project, called M-PACC, to develop high temperature superconducting electric power devices started in June last year (FY2008-FY2012). This project aims to develop three different types of electric power devices that are expected to provide stable power supplies with large capacity and small size by using YBCO coated conductors. The first program is the development of a 2 GJ class superconducting magnetic energy storage system to control stable electric power systems. It is planned to develop several sets of element coils for a 20 MJ class system as a technological feasibility study for a 2 GJ class coil. The second program is the development of two different types of power cables with higher performance than existing power cables; one is a three-core 66 kV-5 kA class large current cable and the other is a single-phase 275 kV-3 kA class high voltage cable. These cable were required several technological developments, namely, large current and low AC loss, high voltage insulation and low dielectric loss, and power and heat balance for both cables. The third program is the development of a 20 MVA class power transformer with 66 kV/6.9 kV as a distribution transformer. In this project, power transformer systematization technology including 2 kA class large current coil technology, anti short-circuit wire winding technology, AC loss reduction technology, and winding technology will be developed.

Fujiwara, N.; Hayashi, H.; Nagaya, S.; Shiohara, Y.

2010-11-01

38

High power microwave source development  

NASA Astrophysics Data System (ADS)

The requirements of this project have been to: (1) improve and expand the sources available in the facility for testing purposes and (2) perform specific tasks under direction of the Defense Nuclear Agency about the applications of high power microwaves (HPM). In this project the HPM application was power beaming. The requirements of this program were met in the following way: (1) We demonstrated that a compact linear induction accelerator can drive HPM sources at repetition rates in excess of 100 HZ at peak microwave powers of a GW. This was done for the relativistic magnetron. Since the conclusion of this contract such specifications have also been demonstrated for the relativistic klystron under Ballistic Missile Defense Organization funding. (2) We demonstrated an L band relativistic magnetron. This device has been used both on our single pulse machines, CAMEL and CAMEL X, and the repetitive system CLIA. (3) We demonstrated that phase locking of sources together in large numbers is a feasible technology and showed the generation of multigigawatt S-band radiation in an array of relativistic magnetrons.

Benford, James N.; Miller, Gabriel; Potter, Seth; Ashby, Steve; Smith, Richard R.

1995-05-01

39

U.S. Wind Power Development  

SciTech Connect

The report provides an overview of domestic wind power development which provides an understanding of where the industry stands today, how it got there, and where it is going. The advent of state renewable portfolio standards and the 3-year renewal of the production tax credit have driven wind power to record levels. A key objective of the report is to provide a comprehensive view of what is behind these developments, so that industry participants can take advantage of the opportunity offered by wind power. Topics covered include: overview of U.S. wind power including its history, current status, and future prospects; business drivers of the U.S. wind power market; barriers to the growth of the U.S. wind power market; keys to successful wind power project development; economics of U.S. wind power, including cost, revenue, and government subsidy components; analysis of key state markets for wind power development; and, profiles of major U.S. wind power project developers.

NONE

2007-11-15

40

Development of Power Assisting Suit  

NASA Astrophysics Data System (ADS)

In order to realize a wearable power assisting suit for assisting a nurse to carry a patient in her arms, the power supply and control systems of the suit have to be miniaturized, and it has to be wireless and pipeline-less. The new wearable suit consists of shoulders, arms, back, waist and legs units to be fitted on the nurse's body. The arms, waist and legs have new pneumatic rotary actuators driven directly by micro air pumps supplied by portable Ni-Cd batteries. The muscle forces are sensed by a new muscle hardness sensor utilizing a sensing tip mounted on a force sensing film device. An embedded microcomputer is used for the calculations of control signals. The new wearable suit was applied practically to a human body and a series of movement experiments that weights in the arms were held and taken up and down was performed. Each unit of the suit could transmit assisting torque directly to each joint verifying its practicability.

Yamamoto, Keijiro; Ishii, Mineo; Hyodo, Kazuhito; Yoshimitsu, Toshihiro; Matsuo, Takashi

41

Advanced development of a programmable power processor  

NASA Technical Reports Server (NTRS)

The need for the development of a multipurpose flexible programmable power processor (PPP) has increased significantly in recent years to reduce ever rising development costs. One of the program requirements the PPP specification will cover is the 25 kW power module power conversion needs. The 25 kW power module could support the Space Shuttle program during the 1980s and 1990s and could be the stepping stone to future large space programs. Trades that led to selection of a microprocessor controlled power processor are briefly discussed. Emphasis is given to the power processing equipment that uses a microprocessor to provide versatility that allows multiple use and to provide for future growth by reprogramming output voltage to a higher level (to 120 V from 30 V). Component selection and design considerations are also discussed.

Lukens, F. E.; Lanier, J. R., Jr.; Kapustka, R. E.; Graves, J.

1980-01-01

42

Development of a Modular Power Converter  

NASA Astrophysics Data System (ADS)

This report describes the most important details of elaboration of a versatile power module that can be utilized as a part of various converters. Two or more modules connected together can form a frequency converter or multilevel converter or 3-phase inverter/rectifier etc. Initially the module was developed for fast prototyping of uninterruptible power supplies and energy systems with alternative energy sources. The module can be used also as a basis for laboratory equipment of the power electronics course.

Stepanov, A.; Biesenieks, L.; Sokolovs, A.; Galkin, I.

2009-01-01

43

High-Power Electromagnetic Thruster Being Developed  

NASA Technical Reports Server (NTRS)

High-power electromagnetic thrusters have been proposed as primary in-space propulsion options for several bold new interplanetary and deep-space missions. As the lead center for electric propulsion, the NASA Glenn Research Center designs, develops, and tests high-power electromagnetic technologies to meet these demanding mission requirements. Two high-power thruster concepts currently under investigation by Glenn are the magnetoplasmadynamic (MPD) thruster and the Pulsed Inductive Thruster (PIT).

LaPointe, Michael R.; Mikellides, Pavlos G.

2001-01-01

44

Multikilowatt power electronics development for spacecraft  

NASA Technical Reports Server (NTRS)

Attention is given to several multikilowatt power electronic components developed by TRW for the Space Station Power Management and Distribution test bed at NASA Lewis Research Center. These components include a 12.5-kW DC-DC converter, a 6.25-kW battery charge/discharge regulator, an 82-channel sequential shunt unit, a 10-A remote power controllers, and three different types of 1-kW load converters. TRW is also monitoring the development of 120-V fuses for space applications. The authors discuss these developments and provide steady-state and dynamic performance parameters.

Decker, D. K.; Inouye, L. Y.; Rolandelli, D. L.

1991-01-01

45

Multikilowatt power electronics development for spacecraft  

NASA Astrophysics Data System (ADS)

Attention is given to several multikilowatt power electronic components developed by TRW for the Space Station Power Management and Distribution test bed at NASA Lewis Research Center. These components include a 12.5-kW DC-DC converter, a 6.25-kW battery charge/discharge regulator, an 82-channel sequential shunt unit, a 10-A remote power controllers, and three different types of 1-kW load converters. TRW is also monitoring the development of 120-V fuses for space applications. The authors discuss these developments and provide steady-state and dynamic performance parameters.

Decker, D. K.; Inouye, L. Y.; Rolandelli, D. L.

46

Experimental development of power reactor advanced controllers  

Microsoft Academic Search

A systematic approach for developing and verifying advanced controllers with potential application to commercial nuclear power plants is suggested. The central idea is to experimentally demonstrate an advanced control concept first on an ultra safe research reactor followed by demonstration on a passively safe experimental power reactor and then finally adopt the technique for improving safety, performance, reliability and operability

R. M. Edwards; C. K. Weng; R. W. Lindsay

1992-01-01

47

Roadmap for power quality standards development  

Microsoft Academic Search

Power quality standards provide the basis for achieving compatibility between the characteristics of the electric supply system and end use equipment. They provide the methods for evaluating performance, define equipment requirements, and outline relative responsibilities. This paper describes the status of important power quality standards around the world and presents a roadmap for ongoing standards development.

M. McGranaghan

2005-01-01

48

High power millimeter wave source development program  

NASA Technical Reports Server (NTRS)

High power millimeter wave sources for fusion program; ECH source development program strategy; and 1 MW, 140 GHz gyrotron experiment design philosophy are briefly outlined. This presentation is represented by viewgraphs only.

George, T. V.

1989-01-01

49

Space Station Power System Advanced Development  

NASA Technical Reports Server (NTRS)

The objectives of the Space Station Advanced Development Program are related to the development of a set of design options and/or new capabilities to support Space Station development and operation, taking into account also a quantification of the performance and risk of key state-of-the-art technologies, and a reduction of the cost and schedule risk in Space Station development. Attention is given to the photovoltaic power system, a solar dynamic system, and aspects of power management and distribution. A major issue will be the selection of the power generation system. In view of the advantages of the solar dynamic system, it is attempted to resolve issues associated with this system.

Forestieri, A. F.; Baraona, C. R.; Valgora, M. E.

1985-01-01

50

Expected development of chemical power sources  

NASA Astrophysics Data System (ADS)

An investigation of chemical power sources considers their use by professional consumers in terms of loadability, weight, life, purchase price, operating price, maintenance requirements, and reliability. The criteria for non-professional consumers are mainly purchase price and whether the system is maintenance-free. The single power sources evaluated according to technical requirements, economic properties, convenience, and prognosis include lead-acid accumulators; Ni-Cd accumulators; Ni-Fe accumulators; Ni-Zn accumulators; Ag-Zn accumulators; Zn-Br system accumulators; and accumulators operating at high and average temperatures. Also considered are Leclanchecells; alkali-manganese dioxide cells; elements with Li anode; and fuel cells. It is concluded that present power sources will probably continue to be used for the next 5-10 years, and further development is proposed in various areas, including power supplies for spacecraft and satellites.

Kulcsar, S.

1984-02-01

51

E3000 High Power SADM development  

NASA Astrophysics Data System (ADS)

Astrium UK has been actively involved in the study, design, development, manufacture and test of Solar Array Drive Mechanisms (SADMs) and Bearing and Power Transfer Assemblies (BAPTAs) since the early 1970s having delivered 105 of these mechanisms to 22 spacecraft programs. As a result Astrium UK has accumulated in excess of 700 years of failure free SADM operation in-orbit. During that period power transfer requirements have grown steadily from below 1kW to 9.9kW and beyond. With this increase in power handling capability comes the associated problem of handling and dissipating the heat being generated within the SADM. The Eurostar 2000 family of SADMs were designed to handle up to 5.6kW for the E2000 family of spacecraft but the High Power SADM was conceived to meet the needs of the much bigger Eurostar 3000 family of spacecraft that could potentially grow to 15kW.

Bamford, Steve G.; McMahon, Paul

2003-09-01

52

Wind Farm Power System Model Development.  

National Technical Information Service (NTIS)

In some areas, wind power has reached a level where it begins to impact grid operation and the stability of local utilities. In this paper, the model development for a large wind farm will be presented. Wind farm dynamic behavior and contribution to stabi...

E. Muljadi C. P. Butterfield

2004-01-01

53

Fuel cell stationary power business development  

NASA Astrophysics Data System (ADS)

This paper discusses the recent business and product development activities at Ballard Generation Systems. Ballard Generation Systems was formed in late 1996 as a venture between Ballard Power Systems and GPU International. The focus of this venture is to commercialize fuel cell power plants for stationary applications using Ballard's polymer electrolyte membrane (PEM) fuel cell. This paper will discuss the framework and structure of this model strategic alliance for fuel cell commercialization. This paper will provide the perspective and rationale of Ballard Power Systems in developing this unique business relationship to bring its PEM fuel cell power plants to market. It will also provide insight into the GPU International viewpoint on the fuel cell business and the GPU International rationale for their investment. As well, this paper will discuss the benefits Ballard and GPU International expect to achieve through this relationship. Having recently completed the construction and commissioning of the prototype of the company's first commercial product, this paper will discuss recent achievements of the company's product development activities as it moves towards product introduction.

Weiner, Scott A.

54

Experimental development of power reactor advanced controllers  

SciTech Connect

A systematic approach for developing and verifying advanced controllers with potential application to commercial nuclear power plants is suggested. The central idea is to experimentally demonstrate an advanced control concept first on an ultra safe research reactor followed by demonstration on a passively safe experimental power reactor and then finally adopt the technique for improving safety, performance, reliability and operability at commercial facilities. Prior to completing an experimental sequence, the benefits and utility of candidate advanced controllers should be established through theoretical development and simulation testing. The applicability of a robust optimal observer-based state feedback controller design process for improving reactor temperature response for a TRIGA research reactor, Liquid Metal-cooled Reactor (LMR), and a commercial Pressurized Water Reactor (PWR) is presented to illustrate the potential of the proposed experimental development concept.

Edwards, R.M. (Pennsylvania State Univ., University Park, PA (United States). Dept. of Nuclear Engineering); Weng, C.K. (Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical Engineering); Lindsay, R.W. (Argonne National Lab., Idaho Falls, ID (United States))

1992-01-01

55

Experimental development of power reactor advanced controllers  

SciTech Connect

A systematic approach for developing and verifying advanced controllers with potential application to commercial nuclear power plants is suggested. The central idea is to experimentally demonstrate an advanced control concept first on an ultra safe research reactor followed by demonstration on a passively safe experimental power reactor and then finally adopt the technique for improving safety, performance, reliability and operability at commercial facilities. Prior to completing an experimental sequence, the benefits and utility of candidate advanced controllers should be established through theoretical development and simulation testing. The applicability of a robust optimal observer-based state feedback controller design process for improving reactor temperature response for a TRIGA research reactor, Liquid Metal-cooled Reactor (LMR), and a commercial Pressurized Water Reactor (PWR) is presented to illustrate the potential of the proposed experimental development concept.

Edwards, R.M. [Pennsylvania State Univ., University Park, PA (United States). Dept. of Nuclear Engineering; Weng, C.K. [Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical Engineering; Lindsay, R.W. [Argonne National Lab., Idaho Falls, ID (United States)

1992-06-01

56

Development of power quality diagnosis system for power quality improvement  

Microsoft Academic Search

This paper represents the structure and functions of total power quality data management system including power quality monitoring system (PQMS), GUI system, and PQ diagnosis system. PQMS characterizes RMS value, harmonics, and frequency, and detects power quality (PQ) events. GUI system manages and stores power quality data received from a number of PQMSs and displays the power quality trends and

Il-Yop Chung; Dong-Jun Won; Joong-Moon Kim; Seon-Ju Ahn; Seung-Il Moon; Jang-Cheol Seo; Jong-Woong Choe

2003-01-01

57

Status of superconducting power transformer development  

SciTech Connect

Development of the superconducting transformer is arguably the most difficult of the ac power applications of superconductivity - this is because of the need for very low ac losses, adequate fault and surge performance, and the rigors of the application environment. This paper briefly summarizes the history of superconducting transformer projects, reviews the key issues for superconducting transformers, and examines the status of HTS transformer development. Both 630-kVA, three-phase and 1-MVA single phase demonstration units are expected to operate in late 1996. Both efforts will further progress toward the development of economical and performance competitive superconducting transformers.

Johnson, R.C.; McConnell, B.W.; Mehta, S.P. [and others

1996-03-01

58

OTEC power system development and environmental impacts  

SciTech Connect

Ocean Thermal Energy Conversion (OTEC) is a proven solar energy technology with enormous potential as a supplier of electric power. However, before this potential can be realized there must be significant reductions in OTEC plant investment costs estimated for state-of-the-art designs. A comprehensive survey of the opportunities for reducing costs of the heat exchangers and other components of the power system of closed-cycle OTEC plants is given. These cost-reducing inventives are strongly dependent on the extent to which the environmental impacts of OTEC plants will have to be controlled. The environmental concerns associated with the deployment of OTEC plants are reviewed, and approaches to alleviating these concerns are described. Finally, the key roles of the OTEC-1 component test facility and the OTEC pilot plant planned for a 1984 start up in providing information about the critical power system development and environmental impact problems are summarized.

Sather, N.F.

1980-02-20

59

Laws of power industry development: Elusory essence  

NASA Astrophysics Data System (ADS)

Ideas, hopes, and disappointments related to a quarter-century research into the laws of power industry development and its relations with society are reviewed; new hypotheses concerning the character and characteristics of these relations are formulated, and some preliminary results of the quantitative verification of these hypotheses are presented. The scope of future investigations is outlined and difficulties encountered in the attempts to collect the necessary retrospective information are considered.

Makarov, Aleksei A.; Makarov, Aleksandr A.

2010-12-01

60

Wireless Power Transmission Technology Development and Demonstrations  

NASA Astrophysics Data System (ADS)

The Wireless Power Transmission (WPT) technology has been treated to a wide extent in the recent years. A broad variety of applications has been investigated, from earth to orbit, orbit to earth, in-orbit and planetary ones, as for moon and Mars missions. In this course the question to use laser or microwave technology has widely been discussed. Beaming energy to spacecrafts could provide an important space mission-economic potential. It promises significant reduction in the cost of access to space, for scientific and commercial missions, and increases the mission capabilities for in-space systems. For the future enhancement of ISS capabilities and operational efficiency, the use of WPT technology became part of the technology research planning for the ISS. The WPT may have the potential of providing operational benefits, increase of spacecraft systems efficiency for elements like co-orbiting platforms, transfer vehicles or other ISS related in-orbit spacecrafts, and planetary exploration vehicles. The laser technology provides specific technical, operational and economic benefits compared to microwave applications and provides the actual basis for the envisioned wireless power transmission concepts. An outlook in terms of future wireless power perspectives, both for terrestrial as for space-to-space scenarios is given; these applications are part of a technology demonstration roadmap for wireless power transmission key- and supporting technologies, which is characterized by dedicated technology demonstration milestones on ground and in space. The actual technology development philosophy as conceived at EADS-Space Transportation is described and includes main system demonstration missions, as a laboratory test bed employing a small rover system, a scaled airship model demonstration as planned in 2004 and an experiment onboard the International Space Station ISS. These demonstrations represent milestones in terms of technical capability verification on the way to solar power platforms in space, as an actual Solar Power Platform Design Concept in the 400 kW range for GEO including the receiver side on ground. Special attention is given to the fact, that technological spin-offs out of the Solar Power Platforms development are an essential aspect of the activities. The application of the suitable type of laser systems for future solar power concepts in space will be discussed, based on recent investigations in the frame of the EADS technology development work. The experimental application of a laser system for power transmission to a moveable and steerable target, a small rover, is addressed also and the demonstration philosophy and experimental set-up are detailed. The ground test objectives, the definition, design and performance of a "Wireless Power Transmission" system and the demonstration of the basic principles of power transmission and target acquisition, pointing and tracking are covered. The lessons learned and consequences for a continuation of this type of demonstration are outlined.

Steinsiek, F.; Weber, K.-H.; Foth, W.-P.; Foth, H. J.; Schäfer, C.

2004-12-01

61

High-power copper vapor laser development  

NASA Astrophysics Data System (ADS)

Copper vapor laser (CVL) devices of 60 mm bore have been developed for atomic vapor laser isotope separation, and recently an average power per device of over 200W (211W maximum) has been achieved by expanding the discharge length to 3000 mm. In order to further improve the power output by increasing the discharge volume, it is important to supply discharge energy efficiently to the laser tube and to maintain the optimum copper vapor density in the larger volume. Now a CVL discharge circuit has been designed using a CVL discharge simulation code able to calculate time-dependent plasma resistance. In addition, a thermal insulation structure that effectively maximizes the laser gain volume has been designed using a thermal simulation code that takes thermal conduction and emission loss from the tube ends into account. This code yields results which show good agreement with experimental data. The results demonstrate that codes which simulate electrical and thermal characteristics are effective tools in the design of high-power CVL devices. In this paper, the methods of designing CVL electrical circuits and laser head structures using CVL simulation codes are reported, and some resulting high-power devices are discussed.

Aoki, Nobutada; Kimura, Hironobu; Konagai, Chikara; Shirayama, Shimpey; Miyazawa, Tatsuo; Takahashi, Tomoyuki

1991-05-01

62

Development of superconducting power transmission technology  

SciTech Connect

Superconducting power transmission cables are the latest innovation in a technology which is as old as electric power engineering. The construction of central electricity generating stations by Thomas Edison in the USA and Sebastian Ferranti in England in the 1880's immediately posed the problem of how customers could be connected to the power source. Distribution by means of wires suspended from poles was tried briefly but the densely populated areas chosen as sites for the early generators soon forced the distribution system underground. Edison's low voltage dc system was a technological dead-end but by 1890 Ferranti had built a 7 mile-long underground cable system from the generating plant at Deptford to central London which operated at the then unprecedented level of 10,000 V, alternating current. Ferranti was remarkably prescient in his choice of wrapped brown paper for the cable insulation, a material which has continued to be used in this application until the present day. Paper was chosen for the insulation because it gave good operating performance at low cost compared to other insulating materials then available, such as rubber and gutta percha. Economic considerations must be weighed carefully in the design of underground power transmission systems and they have been a compelling factor in the pattern of development from the turn of the century to the advanced superconducting systems under test in the 1980's.

Forsyth, E.B.

1985-01-01

63

Advanced Power Regulator Developed for Spacecraft  

NASA Technical Reports Server (NTRS)

The majority of new satellites generate electrical power using photovoltaic solar arrays and store energy in batteries for use during eclipse periods. Careful regulation of battery charging during insolation can greatly increase the expected lifetime of the satellite. The battery charge regulator is usually custom designed for each satellite and its specific mission. Economic competition in the small satellite market requires battery charge regulators that are lightweight, efficient, inexpensive, and modular enough to be used in a wide variety of satellites. A new battery charge regulator topology has been developed at the NASA Lewis Research Center to address these needs. The new regulator topology uses industry-standard dc-dc converters and a unique interconnection to provide size, weight, efficiency, fault tolerance, and modularity benefits over existing systems. A transformer-isolated buck converter is connected such that the high input line is connected in series with the output. This "bypass connection" biases the converter's output onto the solar array voltage. Because of this biasing, the converter only processes the fraction of power necessary to charge the battery above the solar array voltage. Likewise, the same converter hookup can be used to regulate the battery output to the spacecraft power bus with similar fractional power processing.

1996-01-01

64

Autonomous power expert system advanced development  

NASA Technical Reports Server (NTRS)

The autonomous power expert (APEX) system is being developed at Lewis Research Center to function as a fault diagnosis advisor for a space power distribution test bed. APEX is a rule-based system capable of detecting faults and isolating the probable causes. APEX also has a justification facility to provide natural language explanations about conclusions reached during fault isolation. To help maintain the health of the power distribution system, additional capabilities were added to APEX. These capabilities allow detection and isolation of incipient faults and enable the expert system to recommend actions/procedure to correct the suspected fault conditions. New capabilities for incipient fault detection consist of storage and analysis of historical data and new user interface displays. After the cause of a fault is determined, appropriate recommended actions are selected by rule-based inferencing which provides corrective/extended test procedures. Color graphics displays and improved mouse-selectable menus were also added to provide a friendlier user interface. A discussion of APEX in general and a more detailed description of the incipient detection, recommended actions, and user interface developments during the last year are presented.

Quinn, Todd M.; Walters, Jerry L.

1991-01-01

65

Solid state power controller fuse development program  

NASA Astrophysics Data System (ADS)

The purpose of this development program is to design a family of fail-safe fuses (2-30A, 28VDC, 115/230V-400 Hz) for applications in aircraft electrical systems solid state power controllers (SSPCs). The SSPC functions as a circuit interrupter and a load controller, and when operating properly should protect the aircraft wiring between itself and the load. However, if the SSPC fails to open during a short or overload condition, excessive current can flow, resulting in serious damage to aircraft wiring. The purpose of the SSPC fuse is to prevent wire damage in this double fault condition.

Spauhorst, V. R.; Curtis, W. H.; Kalra, V.

1983-10-01

66

Ultrafast Power Processor for Smart Grid Power Module Development  

SciTech Connect

This project’s goal was to increase the switching speed and decrease the losses of the power semiconductor devices and power switch modules necessary to enable Smart Grid energy flow and control equipment such as the Ultra-Fast Power Processor. The primary focus of this project involves exploiting the new silicon-based Super-GTO (SGTO) technology and build on prototype modules already being developed. The prototype super gate-turn-off thyristor (SGTO) has been tested fully under continuously conducting and double-pulse hard-switching conditions for conduction and switching characteristics evaluation. The conduction voltage drop measurement results indicate that SGTO has excellent conduction characteristics despite inconsistency among some prototype devices. Tests were conducted with two conditions: (1) fixed gate voltage and varying anode current condition, and (2) fixed anode current and varying gate voltage condition. The conduction voltage drop is relatively a constant under different gate voltage condition. In terms of voltage drop as a function of the load current, there is a fixed voltage drop about 0.5V under zero current condition, and then the voltage drop is linearly increased with the current. For a 5-kV voltage blocking device that may operate under 2.5-kV condition, the projected voltage drop is less than 2.5 V under 50-A condition, or 0.1%. If the device is adopted in a converter operating under soft-switching condition, then the converter can achieve an ultrahigh efficiency, typically above 99%. The two-pulse switching test results indicate that SGTO switching speed is very fast. The switching loss is relatively low as compared to that of the insulated-gate-bipolar-transistors (IGBTs). A special phenomenon needs to be noted is such a fast switching speed for the high-voltage switching tends to create an unexpected C?dv/dt current, which reduces the turn-on loss because the dv/dt is negative and increases the turn-off loss because the dv/dt is positive. As a result, the turn-on loss at low current is quite low, and the turn-off loss at low current is relatively high. The phenomenon was verified with junction capacitance measurement along with the dv/dt calculation. Under 2-kV test condition, the turn-on and turn-off losses at 25-A is about 3 and 9 mJ, respectively. As compared to a 4.5-kV, 60-A rated IGBT, which has turn-on and turn-off losses about 25 and 20 mJ under similar test condition, the SGTO shows significant switching loss reduction. The switching loss depends on the switching frequency, but under hard-switching condition, the SGTO is favored to the IGBT device. The only concern is during low current turn-on condition, there is a voltage bump that can translate to significant power loss and associated heat. The reason for such a current bump is not known from this study. It is necessary that the device manufacturer perform though test and provide the answer so the user can properly apply SGTO in pulse-width-modulated (PWM) converter and inverter applications.

MAITRA, ARINDAM [EPRI] [EPRI; LITWIN, RAY [EPRI] [EPRI; lai, Jason [Enertronics] [Enertronics; Syracuse, David [Silicon Power] [Silicon Power

2012-12-30

67

Development of a portable thermophotovoltaic power generator  

NASA Astrophysics Data System (ADS)

A 150 Watt thermophotovoltaic (TPV) power generator is being developed. The technical approach taken in the design focused on optimizing the integrated performance of the primary subsystems in order to yield high energy conversion efficiency and cost effectiveness. An important aspect of the approach is the use of a selective emitter radiating to a bandgap matched photovoltaic array to minimize thermal and optical recuperation requirements, as well as the non-recoverable heat losses. For the initial prototype system, fibrous ytterbia emitters radiating in a band centered at 980 nm are matched with high efficiency silicon photoconverters. The integrated system includes a dielectric stack filter for optical energy recovery and a ceramic recuperator for thermal energy recovery. The system has been operated with air preheat temperatures up to 1350K. The design of the system and development status are presented.

Becker, Frederick E.; Doyle, Edward F.; Shukla, Kailash

1997-03-01

68

An accelerated fusion power development plan  

NASA Astrophysics Data System (ADS)

Energy for electricity and transportation is a national issue with worldwide environmental and political implications. The world must have energy options for the next century that are not vulnerable to possible disruption for technical, environmental, public confidence, or other reasons. Growing concerns about the greenhouse effect and the safety of transporting oil may lead to reduced burning of coal and other fossil fuels, and the incidents at Three Mile Island and Chernobyl, as well as nuclear waste storage problems, have eroded public acceptance of nuclear fission. Meeting future world energy needs will require improvements in energy efficiency and conservation. However, the world will soon need new central station power plants and increasing amounts of fuel for the transportation sector. The use of fossil fuels, and possibly even fission power, will very likely be restricted because of environmental, safety, and, eventually, supply considerations. Time is running out for policymakers. New energy technologies cannot be brought to the marketplace overnight. Decades are required to bring a new energy production technology from conception to full market penetration. With the added urgency to mitigate deleterious environmental effects of energy use, policymakers must act decisively now to establish and support vigorous energy technology development programs. The U.S. has invested 8 billion over the past 40 years in fusion research and development. If the U.S. fusion program proceeds according to its present strategy, an additional 40 years, and more money, will be expended before fusion will provide commercial electricity. Such an extended schedule is neither cost-effective nor technically necessary. It is time to launch a national venture to construct and operate a fusion power pilot plant. Such a plant could be operational within 15 years of a national commitment to proceed.

Dean, Stephen O.; Baker, Charles C.; Cohn, Daniel R.; Kinkead, Susan D.

1991-06-01

69

Development of a novel power system for space applications  

NASA Technical Reports Server (NTRS)

This paper will describe the power ASICs, module and slices, the key performance capabilities, and the power system architecture of a sample system. In addition the current development status of the X2000 Power System components will be presented.

Deligiannis, F.; Carr, G.; Jones, L.; Lam, B.; Nelson, R.; Pantaleon, J.; Ruiz, I.; Treicler, J.; Wester, G.; Sauers, J.; Giampoli, P.; Haskell, R.; Mulvey, J.; Repp, J.

2003-01-01

70

The Power Systems Development Facility -- Current status  

SciTech Connect

Southern Company Services, Inc. (SCS) has entered into a cooperative agreement with the US Department of Energy (DOE) to build and operate the Power Systems Development Facility (PSDF), currently under construction in Wilsonville, Alabama, 40 miles southeast of Birmingham. The objectives of the PSDF are to develop advanced coal-fired power generation technologies through testing and evaluation of hot gas cleanup systems and other major components at the pilot scale. The performance of components will be assessed and demonstrated in an integrated mode of operation and at a component size readily scaleable to commercial systems. The facility will initially contain five modules: (1) a transport reactor gasifier and combustor, (2) an advanced pressurized fluidized-bed combustion (APFBC) system, (3) a particulate control module, (4) an advanced burner-gas turbine module, and (5) a fuel cell. The five modules will initially be configured into two separate test trains, the transport reactor train (2 tons/hour of coal feed) and the APFBC train (3 tons/hour of coal feed). In addition to a project description, the project design and construction status, preparations for operations, and project test plans are reported in this paper.

Pinkston, T.E.; Maxwell, J.D.; Leonard, R.F.; Vimalchand, P.

1995-11-01

71

Reactive power market development considering power system security  

Microsoft Academic Search

In the new open access environment, in pursuit of profit, power producers tend to operate closer to the security boundaries\\u000a and consequently, the voltage instability, which is caused by insufficient reactive power support, threats system security\\u000a and reliability. This paper presents a day-ahead reactive power market based on uniform auction price scheme considering voltage\\u000a security. First, expected payment function (EPF),

Abdorreza Rabiee; Nima Amjady; Heidarali Shayanfar

2010-01-01

72

Development of virtual simulation system on power plant construction process  

Microsoft Academic Search

As the complexity of power plant construction process, the virtual simulation technology is applied to power plant construction area. Three-dimension models of the power plant parts are established, and virtual simulation system of power plant construction process is developed. The system simulates dynamically the construction process of all equipments in the power plant. Combined with voice caption and word description,

Che De-yong; Li Shao-hua; Liang Xing-bao; Zhang Qing-zhe; Yao Jian-feng; Wang Hu

2010-01-01

73

Gyrotron development for space power beaming  

NASA Technical Reports Server (NTRS)

The use of a gyrotron for space power beaming, especially in the form of a lunar orbiting power station is discussed. The advantages of phased array power beaming, output power, and the design of a quasi-optical gyrotron are discussed.

Manheimer, Wallace M.

1989-01-01

74

Development of Superconducting Power Transmission Technology.  

National Technical Information Service (NTIS)

Superconducting power transmission cables are the latest innovation in a technology which is as old as electric power engineering. The construction of central electricity generating stations by Thomas Edison in the USA and Sebastian Ferranti in England in...

E. B. Forsyth

1985-01-01

75

High-power fiber lasers: new developments  

Microsoft Academic Search

We assess different power limits of cladding-pumped fiber lasers. Despite recent advances in pump sources, these are still primarily limited by available pump power. We find that it should be possible to reach output powers beyond 1 kW in single-mode ytterbium doped fiber lasers. Experimentally, we have realized an ytterbium-doped fiber laser with 272 W of output power at 1080

Johan Nilsson; Jayanta K. Sahu; Yoochan Jeong; W. A. Clarkson; R. Selvas; Anatoly B. Grudinin; Shaiful Alam

2003-01-01

76

Development of superconducting power devices in Europe  

NASA Astrophysics Data System (ADS)

Europe celebrated last year (2008) the 100-year anniversary of the first liquefaction of helium by H. Kammerling Onnes in Leiden. It led to the discovery of superconductivity in 1911. Europe is still active in the development of superconducting (SC) devices. The discovery of high critical temperature materials in 1986, again in Europe, has opened a lot of opportunities for SC devices by broking the 4 K cryogenic bottleneck. Electric networks experience deep changes due to the emergence of dispersed generation (renewable among other) and to the advances in ICT (Information Communication Technologies). The networks of the future will be “smart grids”. Superconductivity will offer “smart” devices for these grids like FCL (Fault Current Limiter) or VLI (Very Low Inductance) cable and would certainly play an important part. Superconductivity also will participate to the required sustainable development by lowering the losses and enhancing the mass specific powers. Different SC projects in Europe will be presented (Cable, FCL, SMES, Flywheel and Electrical Machine) but the description is not exhaustive. Nexans has commercialized the first two FCLs without public funds in the European grid (UK and Germany). The Amsterdam HTS cable is an exciting challenge in term of losses for long SC cables. European companies (Nexans, Air Liquide, Siemens, Converteam, …) are also very active for projects outside Europe (LIPA, DOE FCL, …).

Tixador, Pascal

2010-11-01

77

Kilovolt dc solid state remote power controller development  

NASA Astrophysics Data System (ADS)

The experience gained in developing and applying solid state power controller (SSPC) technology at high voltage dc (HVDC) potentials and power levels of up to 25 kilowatts is summarized. The HVDC switching devices, power switching concepts, drive circuits, and very fast acting overcurrent protection circuits were analyzed. A 25A bipolar breadboard with Darlington connected switching transistor was built. Fault testing at 900 volts was included. A bipolar transistor packaged breadboard design was developed. Power MOSFET remote power controller (RPC) was designed.

Mitchell, J. T.

1982-10-01

78

Kilovolt dc solid state remote power controller development  

NASA Technical Reports Server (NTRS)

The experience gained in developing and applying solid state power controller (SSPC) technology at high voltage dc (HVDC) potentials and power levels of up to 25 kilowatts is summarized. The HVDC switching devices, power switching concepts, drive circuits, and very fast acting overcurrent protection circuits were analyzed. A 25A bipolar breadboard with Darlington connected switching transistor was built. Fault testing at 900 volts was included. A bipolar transistor packaged breadboard design was developed. Power MOSFET remote power controller (RPC) was designed.

Mitchell, J. T.

1982-01-01

79

National strategies for nuclear power reactor development  

Microsoft Academic Search

The document assesses the potential for design innovation in three areas of nuclear power plant technology: light-water reactor systems; liquid-metal reactor systems; and high-temperature-gas reactor systems. The question of how capital costs scale with unit size in nuclear power reactor systems is addressed. Small modular high temperature gas reactor designs are reviewed, and an electric-power-system capacity-planning model that allows estimates

R. K. Lester; M. J. Driscoll; M. W. Golay; D. D. Lanning; L. M. Lidsky

1985-01-01

80

Developing relational exchange : Effectiveness and power  

Microsoft Academic Search

Argues that relational exchange is dependent upon both effectiveness and power considerations. The primary objective is to study the effect of power and effectiveness on the relational exchange process between voluntary retail chains and their vendors. In particular, proposes that relational exchange between the chain and the vendor is dependent on (1) the chain’s ability to obtain necessary coordination and

Aksel I. Rokkan; Sven A. Haugland

2002-01-01

81

Further development of “self-powered boilers”  

Microsoft Academic Search

The concept of “self-powered” appliances is one where a normally flame-heated appliance generates enough electricity also to operate its electrical components, and therefore the unit operates free from the electric grid. This would be in contrast to cogeneration, in which surplus electric power is generated to be used for other functions beyond the principal purpose of the appliance. Thermoelectric generating

D. T. Alien; W. C. Mallon

1999-01-01

82

Solar Dynamic Power System Development for Space Station Freedom.  

National Technical Information Service (NTIS)

The development of a solar dynamic electric power generation system as part of the Space Station Freedom Program is documented. The solar dynamic power system includes a solar concentrator, which collects sunlight; a receiver, which accepts and stores the...

1993-01-01

83

Human exploration of space and power development  

NASA Technical Reports Server (NTRS)

Reasons for mounting the Space Exploration Initiative, the variables facing U.S. planners, and the developmental technologies that will be needed to support this initiative are discussed. The three more advanced technological approaches in the field of power generation described include a lunar-based solar power system, a geosynchronous-based earth orbit solar power satellite system, and the utilization of helium-3/deuterium fusion reaction to create a nuclear fuel cycle. It is noted that the major elements of the SEI will include a heavy-lift launch vehicle, a transfer vehicle and a descent/ascent vehicle for use on lunar missions and adaptable to Mars exploration.

Cohen, Aaron

1991-01-01

84

Nanostructured Materials Development for Space Power  

NASA Technical Reports Server (NTRS)

There have been many recent advances in the use of nanostructured materials for space power applications. In particular, the use of high purity single wall nanotubes holds promise for a variety of generation and storage devices including: thin film lithium ion batteries, microelectronic proton exchange membrane (PEM) fuel cells, polymeric thin film solar cells, and thermionic power supplies is presented. Semiconducting quantum dots alone and in conjunction with carbon nanotubes are also being investigated for possible use in high efficiency photovoltaic solar cells. This paper will review some of the work being done at RIT in conjunction with the NASA Glenn Research Center to utilize nanomaterials in space power devices.

Raffaelle, Ryne P.; Landi, B. J.; Elich, J. B.; Gennett, T.; Castro, S. L.; Bailey, Sheila G.; Hepp, Aloysius F.

2003-01-01

85

Nanostructured Materials Development for Space Power.  

National Technical Information Service (NTIS)

There have been many recent advances in the use of nanostructured materials for space power applications. In particular, the use of high purity single wall nanotubes holds promise for a variety of generation and storage devices including: thin film lithiu...

R. P. Raffaelle B. J. Landi J. B. Elich T. Gennett S. L. Castro S. G. Bailey A. F. Hepp

2002-01-01

86

New developments in RF power sources  

SciTech Connect

The most challenging rf source requirements for high-energy accelerators presently being studied or designed come from the various electron-positron linear collider studies. All of these studies except TESLA (the superconducting entry in the field) have specified rf sources with much higher peak powers than any existing tubes at comparable high frequencies. While circular machines do not, in general, require high peak power, the very high luminosity electron-positron rings presently being designed as B factories require prodigious total average rf power. In this age of energy conservation, this puts a high priority on high efficiency for the rf sources. Both modulating anodes and depressed collectors are being investigated in the quest for high efficiency at varying output powers.

Miller, R.H.

1994-06-01

87

ZERO EMISSION POWER GENERATION TECHNOLOGY DEVELOPMENT  

Microsoft Academic Search

Clean Energy Systems (CES) was previously funded by DOE's ''Vision 21'' program. This program provided a proof-of-concept demonstration that CES' novel gas generator (combustor) enabled production of electrical power from fossil fuels without pollution. CES has used current DOE funding for additional design study exercises which established the utility of the CES-cycle for retrofitting existing power plants for zero-emission operations

Ronald Bischoff; Stephen Doyle

2005-01-01

88

Novel Development of Power Transformation Technology Supporting Electric Power and Energy  

NASA Astrophysics Data System (ADS)

The power transformation technology which is the key point of electric power transmission supports our life base in the electric power energy field. Especially, the static apparatus which is used as the electric power conversion and control has an important role at the substation. In this review, the novel development of power transformation technology supporting electric power and energy is described with the maintenance diagnostic technology of sustainability and safety transformer, condenser and its applied technology for variation of power supply and load under the electric power system, high current technology under the power and electric filed and surge analysis technology at the substation. The power transformation technology and static apparatus have been developed in a high level in our country. The problem in this review will be expected to overcome soon.

Okubo, Kenji; Nishimura, Shoji; Goda, Yutaka; Baba, Yoshihiro

89

Development of the NEXT Power Processing Unit  

NASA Technical Reports Server (NTRS)

Boeing Electron Dynamic Devices, Inc. (EDD) has designed and fabricated a breadboard version of a 6 kW power processing unit (PPU) for gridded ion thrusters. This breadboard PPU will be integrated with an engineering model 40 cm ion engine designed and tested at NASA Glenn. The results of our tests using resistive loads are reported in this paper. The PPU demonstrated efficiencies to date are higher than 95 percent for the beam supply and higher than 92 percent for the discharge supply at full power. Overall PPU efficiency is greater than 94 percent at full throttle settings.

Phelps, Thomas K.; Wiseman, Steve; Komm, David S.; Bond, Thomas; Pinero, Luis R.

2005-01-01

90

Solar power tower development: Recent experiences  

SciTech Connect

Recent experiences with the 10 MW{sub e} Solar Two and the 2.5 MW{sub t} TSA (Technology Program Solar Air Receiver) demonstration plants are reported. The heat transfer fluids used in these solar power towers are molten-nitrate salt and atmospheric air, respectively. Lessons learned and suggested technology improvements for next-generation plants are categorized according to subsystem. The next steps to be taken in the commercialization process for each these new power plant technologies is also presented.

Tyner, C.; Kolb, G.; Prairie, M. [and others

1996-12-01

91

Development of the PowerCyber SCADA security testbed  

Microsoft Academic Search

Meeting current demands for critical infrastructure cyber security education and research will require accurate testbed development. The PowerCyber was designed to closely resemble power grid communication utilizing actual field devices and SCADA software. The testbed provides a novel environment where students can explore cyber attacks and defenses while evaluating their impact on power flow. This paper documents the design and

Adam Hahn; Ben Kregel; Manimaran Govindarasu; Justin Fitzpatrick; Rafi Adnan; Siddharth Sridhar; Michael Higdon

2010-01-01

92

Development of the NEXT Power Processing Unit.  

National Technical Information Service (NTIS)

Boeing Electron Dynamic Devices, Inc. (EDD) has designed and fabricated a breadboard version of a 6 kW power processing unit (PPU) for gridded ion thrusters. This breadboard PPU will be integrated with an engineering model 40 cm ion engine designed and te...

T. K. Phelps S. Wiseman D. S. Komm T. Bond L. R. Pinero

2005-01-01

93

Geothermal power development: 1984 overview and update  

Microsoft Academic Search

The status of geothermal power plants as of mid-1984 is given. There are 15 countries with active plants, and France (Guadeloupe) is expected to join the roster in the near future. The total number of operating units (defined as individual turbo-generator sets) is 145; the total installed capacity is somewhat less than 3770 MW. If plans for additional plants are

DiPippo

1984-01-01

94

Human exploration of space and power development  

NASA Technical Reports Server (NTRS)

The possible role of Solar Power Satellites (SPS) in advancing the goals of the Space Exploration Initiative is considered. Three approaches are examined: (1) the use of lunar raw materials to construct a large SPS in GEO, (2) the construction of a similar system on the lunar surface, and (3) a combination of (1) and (2). Emphasis is given to the mining of He-3 from the moon and its use by the SPS.

Cohen, Aaron

1991-01-01

95

Advanced Power Plant Development and Analysis Methodologies  

SciTech Connect

Under the sponsorship of the U.S. Department of Energy/National Energy Technology Laboratory, a multi-disciplinary team led by the Advanced Power and Energy Program of the University of California at Irvine is defining the system engineering issues associated with the integration of key components and subsystems into advanced power plant systems with goals of achieving high efficiency and minimized environmental impact while using fossil fuels. These power plant concepts include 'Zero Emission' power plants and the 'FutureGen' H2 co-production facilities. The study is broken down into three phases. Phase 1 of this study consisted of utilizing advanced technologies that are expected to be available in the 'Vision 21' time frame such as mega scale fuel cell based hybrids. Phase 2 includes current state-of-the-art technologies and those expected to be deployed in the nearer term such as advanced gas turbines and high temperature membranes for separating gas species and advanced gasifier concepts. Phase 3 includes identification of gas turbine based cycles and engine configurations suitable to coal-based gasification applications and the conceptualization of the balance of plant technology, heat integration, and the bottoming cycle for analysis in a future study. Also included in Phase 3 is the task of acquiring/providing turbo-machinery in order to gather turbo-charger performance data that may be used to verify simulation models as well as establishing system design constraints. The results of these various investigations will serve as a guide for the U. S. Department of Energy in identifying the research areas and technologies that warrant further support.

A.D. Rao; G.S. Samuelsen; F.L. Robson; B. Washom; S.G. Berenyi

2006-06-30

96

Advanced Power Plant Development and Analyses Methodologies  

SciTech Connect

Under the sponsorship of the U.S. Department of Energy/National Energy Technology Laboratory, a multi-disciplinary team led by the Advanced Power and Energy Program of the University of California at Irvine is defining the system engineering issues associated with the integration of key components and subsystems into advanced power plant systems with goals of achieving high efficiency and minimized environmental impact while using fossil fuels. These power plant concepts include ''Zero Emission'' power plants and the ''FutureGen'' H{sub 2} co-production facilities. The study is broken down into three phases. Phase 1 of this study consisted of utilizing advanced technologies that are expected to be available in the ''Vision 21'' time frame such as mega scale fuel cell based hybrids. Phase 2 includes current state-of-the-art technologies and those expected to be deployed in the nearer term such as advanced gas turbines and high temperature membranes for separating gas species and advanced gasifier concepts. Phase 3 includes identification of gas turbine based cycles and engine configurations suitable to coal-based gasification applications and the conceptualization of the balance of plant technology, heat integration, and the bottoming cycle for analysis in a future study. Also included in Phase 3 is the task of acquiring/providing turbo-machinery in order to gather turbo-charger performance data that may be used to verify simulation models as well as establishing system design constraints. The results of these various investigations will serve as a guide for the U. S. Department of Energy in identifying the research areas and technologies that warrant further support.

G.S. Samuelsen; A.D. Rao

2006-02-06

97

Development of power distribution cabinet for higher-voltage direct-current power feeding system  

Microsoft Academic Search

Reducing the feeding loss of information and communications technology equipment, such as servers and routers, is very effective for reducing the total power consumption in data centers and telecommunication buildings. In this paper, the structure and function of a higher-voltage direct-current (HVDC) power feeding system prototype is presented. This system was developed to reduce power delivery and conversion losses by

Tadatoshi Babasaki; Toshimitsu Tanaka; Kaoru Asakura; Yousuke Nozaki; Fujio Kurokawa

2010-01-01

98

A Practical Approach to Starting Fission Surface Power Development  

Microsoft Academic Search

The Prometheus Power and Propulsion Program has been reformulated to address NASA needs relative to lunar and Mars exploration. Emphasis has switched from the Jupiter Icy Moons Orbiter (JIMO) flight system development to more generalized technology development addressing Fission Surface Power (FSP) and Nuclear Thermal Propulsion (NTP). Current NASA budget priorities and the deferred mission need date for nuclear systems

2006-01-01

99

Curriculum Reform, Professional Development, and Powerful Learning  

NSDL National Science Digital Library

The authors consider the important relationship between standards-based curriculum implementation and professional development. They begin by looking at the key recommendations about student learning and then discuss how curriculum materials can embody these recommendations. Because the result is nontraditional curriculum materials, they then consider the role of professional development for increasing the effectiveness of those materials. Finally, they discuss a professional development strategy that begins with selecting materials for curriculum reform.

Short, James B.; Powell, Janet C.; Landes, Nancy M.

2002-01-01

100

Practical Superconductor Development for Electrical Power Applications.  

National Technical Information Service (NTIS)

This is a multiyear experimental research program that focuses on improving relevant material properties of high-Tc superconductors (HTS) and developing fabrication methods that can be transferred to industry for production of commercial conductors. A key...

2001-01-01

101

Practical Superconductor Development for Electrical Power Applications.  

National Technical Information Service (NTIS)

This is a multiyear experimental research program focused on improving relevant material properties of high-Tc superconductors (HTSs) and on development of fabrication methods that can be transferred to industry for production of commercial conductors. Th...

2001-01-01

102

Geothermal power development: 1984 overview and update  

SciTech Connect

The status of geothermal power plants as of mid-1984 is given. There are 15 countries with active plants, and France (Guadeloupe) is expected to join the roster in the near future. The total number of operating units (defined as individual turbo-generator sets) is 145; the total installed capacity is somewhat less than 3770 MW. If plans for additional plants are met, the total could jump by more than 200 MW over the next two years. Recent growth is presented and the worldwide installed capacity is traced. A graphic portrayal of the growth pattern is presented. The countries that will be most responsible for sustaining this growth are the US, the Philippines, Mexico, and Indonesia. Other countries that will contribute significantly include Italy, Japan, Kenya, Nicaragua, and Turkey. The following countries do not now have any geothermal plants but may bring some online by 1990: Guatemala, Costa Rica, Greece, St. Lucia, Thailand, and Ethiopia.

DiPippo, R.

1984-10-01

103

Radioisotope-based Nuclear Power Strategy for Exploration Systems Development  

SciTech Connect

Nuclear power will play an important role in future exploration efforts. Its benefits pertain to practically all the different timeframes associated with the Exploration Vision, from robotic investigation of potential lunar landing sites to long-duration crewed missions on the lunar surface. However, the implementation of nuclear technology must follow a logical progression in capability that meets but does not overwhelm the power requirements for the missions in each exploration timeframe. It is likely that the surface power infrastructure, particularly for early missions, will be distributed in nature. Thus, nuclear sources will have to operate in concert with other types of power and energy storage systems, and must mesh well with the power architectures envisioned for each mission phase. Most importantly, they must demonstrate a clear advantage over other non-nuclear options (e.g., solar power, fuel cells) for their particular function. This paper describes a strategy that does this in the form of three sequential system developments. It begins with use of radioisotope generators currently under development, and applies the power conversion technology developed for these units to the design of a simple, robust reactor power system. The products from these development efforts would eventually serve as the foundation for application of nuclear power systems for exploration of Mars and beyond.

Schmidt, George R.; Houts, Michael G. [NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)

2006-01-20

104

Practical superconductor development for electrical power applications  

SciTech Connect

Development of useful high-critical-temperature (high-[Tc]) superconductors requires synthesis of superconducting compounds; fabrication of wires, tapes, and films from these compounds; production of composite structures that incorporate stabilizers or insulators; and design and testing of efficient components. This report describes the technical progress of research and development efforts aimed at producing superconducting components that are based on the Y-Ba-Cu, Bi-Sr-Ca-Cu, Bi-Pb-Sr-Ca-Cu, and (TI,Pb)-(Ba,Sr)-Ca-Cu oxide systems. Topics discussed are synthesis and heat treatment of high-[Tc] superconductors, formation of monolithic and composite wires and tapes, superconductor/metal connectors, characterization of structures and superconducting and mechanical properties, fabrication and properties of thin films, and development of prototype components. Collaborations with industry and academia are documented.

Goretta, K.C. (comp.)

1992-10-01

105

High power gyrotrons. Development and applications  

Microsoft Academic Search

We present a brief description of first steps in gyrotron development, analysis of current status of megawatt gyrotron creation for nuclear fusion program and survey of gyrotron applications: for basic researches of quasi-optical millimeter wave beam interaction with matter (including free localized gaseous discharge in focused mm wave beams, mm waves phase conjugation, electromagnetically induced transparency) for electron cyclotron plasma

A. G. Litvak

2008-01-01

106

Selection and development of small solar thermal power applications  

NASA Technical Reports Server (NTRS)

The paper discusses the approach of the JPL Point Focusing Thermal and Electric Power Applications Project to selecting and developing applications for point-focusing distributed-receiver solar thermal electric power systems. Six application categories are defined. Results of application studies of U.S. utilities are presented. The economic value of solar thermal power systems was found to range from $900 to $2100/kWe in small community utilities of the Southwest.

Bluhm, S. A.; Kuehn, T. J.; Gurfield, R. M.

1979-01-01

107

Heat engine development for solar thermal power systems  

NASA Technical Reports Server (NTRS)

The parabolic dish solar collector systems for converting sunlight to electrical power through a heat engine will, require a small heat engine of high performance long lifetime to be competitive with conventional power systems. The most promising engine candidates are Stirling, high temperature Brayton, and combined cycle. Engines available in the current market today do not meet these requirements. The development of Stirling and high temperature Brayton for automotive applications was studied which utilizes much of the technology developed in this automotive program for solar power engines. The technical status of the engine candidates is reviewed and the components that may additional development to meet solar thermal system requirements are identified.

Pham, H. Q.; Jaffe, L. D.

1981-01-01

108

Development of an efficient photovoltaic maximum power point tracking controller  

Microsoft Academic Search

A high performance boost converter for maximum power point tracking (MPPT) of photovoltaic (PV) systems is presented. The proposed boost converter uses a new active snubber to minimize losses in the switching and improve efficiency of the converter. For tracking the maximum power point of a PV array, a closed loop fuzzy logic based MPPT controller has been developed. The

Subiyanto; Azah Mohamed; MA Hannan

2011-01-01

109

Development of a High Average Power Glass Laser Source.  

National Technical Information Service (NTIS)

The subject contract has as its objective the development of a high average power glass laser by systematically improving the factors which influence the ability of a laser glass to handle large power levels. Based upon the availability of the athermal la...

J. D. Myers

1984-01-01

110

Power Systems Development Facility: Design, Construction, and Commissioning Status  

SciTech Connect

This paper will provide an introduction to the Power Systems Development Facility, a Department of Energy sponsored, engineering scale demonstration of two advanced coal-fired power technologies; and discuss current status of design, construction and commissioning of this facility. 28 viewgraphs, including 2 figs.

Powell, C.A.; Vimalchand; Hendrix, H.L.; Honeycut, P.M.

1996-12-31

111

Developing and analysis of power systems using psat software  

Microsoft Academic Search

The paper shows the use of Power System Analysis Toolbox (PSAT) in analysis of power system stability, in conditions of small and large disturbances. The system comprises 13 buses, 5 synchronous generators, 15 transmission lines and 9 load centers. The PSAT software runs under Matlab and Simulink environment which offer flexibility and ability of easy simulation and development.

D. Sarussi; R. Rabinovici

2008-01-01

112

High power space TWTA development activities for new broadcasting satellites  

NASA Astrophysics Data System (ADS)

This paper describes the development activities including the design, improved performance characteristics and evaluation test results of several types of high power space TWTAs (TWT and EPCs) of 22 and 12 GHz which will be useful for future high power broadcasting satellites.

Morishita, Yoji; Hoshino, Hitoshi; Nakagawa, Hitoshi; Makino, Toshimoto; Hamada, Sadanori; Kubo, Hideichi; Koike, Tatsuya; Takahashi, Kenji; Iwanami, Yoshitomo

113

Development of Lightweight Radiators for Lunar Based Power Systems.  

National Technical Information Service (NTIS)

This report discusses application of a new lightweight carbon-carbon (C-C) space radiator technology developed under the NASA Civil-Space Technology Initiative (CSTI) High Capacity Power Program to a 20 kWe lunar based power system. This system comprises ...

A. J. Juhasz H. S. Bloomfield

1994-01-01

114

THE AECL SYMPOSIUM ON ENGINEERING DEVELOPMENT IN NUCLEAR POWER  

SciTech Connect

Eleven papers and a final panel session summary are included in the conference proceedings. Paper titles are: Electrical power in Canada's future; Nuclear power in the next decade and AECL's program to meet it; The status of heat-transfer and fluid-dynamics research related to the Candu power reactor program; Mechanical engineering research and development in AECL; Isotope energy source development at commercial products; Extrusion of aluminum, uranium, and zirconium alloys at CRNL; The chemical engineer's role in nuclear-power-reaction design, development and operation; Chemical engineering research and development for fuel reprocessing and heavy-water production; Future reactor design criteria and how they can be met; Instrumentation and control; Accelerator research and engineering; and, the Panel session summary.

None

1971-11-15

115

Practical Approach to Starting Fission Surface Power Development.  

National Technical Information Service (NTIS)

The Prometheus Power and Propulsion Program has been reformulated to address NASA needs relative to lunar and Mars exploration. Emphasis has switched from the Jupiter Icy Moons Orbiter (JIMO) flight system development to more generalized technology develo...

L. S. Mason

2006-01-01

116

Development of a General Purpose Power System Control Board  

SciTech Connect

In an effort to control modern solid state power modules, a general purpose, multi function power system control board (PSCB) has been under development as a collaboration project between Pohang Accelerator Laboratory (PAL), Korea, and Stanford Linear Accelerator Center (SLAC), USA. The PSCB is an embedded, interlock supervisory, diagnostic, timing, and set-point control board. It is designed to use in various power systems such as sequenced kicker pulsers, solid state RF modulators, simple DC magnet power supplies, etc. The PSCB has the Ethernet communication with the TCP/IP Modbus protocol.

Nam, S.H.; Jeong, S.H.; Kim, S.H.; Kim, S.C.; Park, S.S.; Suh, J.H.; /Pohang Accelerator Lab.; Bellomo, P.; Cassel, R.; Larsen, R.; Nguyen, M.N.; /SLAC

2007-07-23

117

Technological implications of SNAP reactor power system development on future space nuclear power systems  

SciTech Connect

Nuclear reactor systems are one method of satisfying space mission power needs. The development of such systems must proceed on a path consistent with mission needs and schedules. This path, or technology roadmap, starts from the power system technology data base available today. Much of this data base was established during the 1960s and early 1970s, when government and industry developed space nuclear reactor systems for steady-state power and propulsion. One of the largest development programs was the Systems for Nuclear Auxiliary Power (SNAP) Program. By the early 1970s, a technology base had evolved from this program at the system, subsystem, and component levels. There are many implications of this technology base on future reactor power systems. A review of this base highlights the need for performing a power system technology and mission overview study. Such a study is currently being performed by Rockwell's Energy Systems Group for the Department of Energy and will assess power system capabilities versus mission needs, considering development, schedule, and cost implications. The end product of the study will be a technology roadmap to guide reactor power system development.

Anderson, R.V.

1982-11-16

118

Approach to developing reliable space reactor power systems  

NASA Technical Reports Server (NTRS)

During Phase II, the Engineering Development Phase, the SP-100 Project has defined and is pursuing a new approach to developing reliable power systems. The approach to developing such a system during the early technology phase is described along with some preliminary examples to help explain the approach. Developing reliable components to meet space reactor power system requirements is based on a top-down systems approach which includes a point design based on a detailed technical specification of a 100-kW power system. The SP-100 system requirements implicitly recognize the challenge of achieving a high system reliability for a ten-year lifetime, while at the same time using technologies that require very significant development efforts. A low-cost method for assessing reliability, based on an understanding of fundamental failure mechanisms and design margins for specific failure mechanisms, is being developed as part of the SP-100 Program.

Mondt, Jack F.; Shinbrot, Charles H.

1991-01-01

119

On applicability of reciprocating flow turbines developed for wave power to tidal power conversion  

Microsoft Academic Search

Tidal power generation with reciprocating turbines in a simple system is investigated on a performance simulation in order to enlarge the capability of practical use of tidal power with extra-low head and time-varying energy density characteristics. Four reciprocating turbines, which are two types of impulse and a Wells developed for wave power conversion systems, and a cross-flow type of Darrieus

K. Takenouchi; K. Okuma; A. Furukawa; T. Setoguchi

2006-01-01

120

MGX: a high-power, pulsed microwave generator development project  

SciTech Connect

A high-power, short-pulse microwave source, MGX, is being developed at Lawrence Livermore National Laboratory. It will be used for high-power microwave vulnerability and lethality studies, investigation of air breakdown, and high-power microwave diagnostic development. The microwave source, a virtual cathode oscillator (VIRCATOR), is initially designed to operate at 8 GHz, with an output power greater than 1 GW, and 70 ns pulse width. The pulsed power source is a modified one-unit FXR Blumlein system charged to approximately 650 kV. A new insulator and electron-beam diode have been designed. In addition, a water-breakdown gap has been included to suppress diode prepulse and to sharpen the pulse rise time. The VIRCATOR has been extensively modeled with the MASK code at LLNL. Preliminary results are presented.

Scarpetti, R.; Vogtlin, G.; Lundberg, R.; Burkhart, S.; Hofer, W.

1983-06-03

121

On-site fuel cell power plant technology development program  

NASA Astrophysics Data System (ADS)

Fuel cell power plant designs, specifications and technologies were evaluated to define a power plant approach having the potential for meeting initial on-site commercial service market requirements and costs. An intial commerical market segment was defined for a range of power plant sizes. A preliminary power plant specification and model power plant system were selected as a baseline for further technology development and cost reduction efforts in subsequent program phases. Inverter designs with advanced individual commutation circuitry were defined and evaluated. Sulphur-tolerant reformer catalysts were tested and cell performance on sulphur-bearing fuels was determined. Electrode substrates having greater electrolyte storage capacity and intercell cooler concepts having improved corrosion resistance were developed.

Mientek, A. P.

1982-07-01

122

Full power level development of the Space Shuttle main engine  

NASA Technical Reports Server (NTRS)

Development of the Space Shuttle main engine for nominal operation at full power level (109 percent rated power) is continuing in parallel with the successful flight testing of the Space Transportation System. Verification of changes made to the rated power level configuration currently being flown on the Orbiter Columbia is in progress and the certification testing of the full power level configuration has begun. The certification test plan includes the accumulation of 10,000 seconds on each of two engines by early 1983. Certification testing includes the simulation of nominal mission duty cycles as well as the two abort thrust profiles: abort to orbit and return to launch site. Several of the certification tests are conducted at 111 percent power to demonstrate additional safety margins. In addition to the flight test and development program results, future plans for life demonstration and engine uprating will be discussed.

Johnson, J. R.; Colbo, H. I.

1982-01-01

123

Development status of the heatpipe power and bimodal systems  

NASA Astrophysics Data System (ADS)

Space fission power systems can potentially enhance or enable ambitious lunar and Martian surface missions. Research into space fission power systems has been ongoing (at various levels) since the 1950s, but to date the United States (US) has flown only one space fission system, SNAP-10A, in 1965. Cost and development time have been significant reasons why space fission systems have not been used by the US. High cost and long development time are not inherent to the use of space fission power. However, high cost and long development time are inherent to any program that tries to do too much at once. Nearly all US space fission power programs have attempted to field systems capable of high power, even though more modest systems had not yet been flown. All of these programs have failed to fly a space fission system. Relatively low power (10 to 100 kWe) fission systems may be useful for near-term lunar and Martian surface missions, including missions in which in situ resource utilization is a priority. Such systems may also be useful for deep-space science missions and other missions. These systems can be significantly less expensive to develop than high power systems. Experience gained in the development of low-power space fission systems can then be used to enable cost-effective development of high-power (>1000 kWe) fission systems. The Heatpipe Power System (HPS) is a potential, near-term, low-cost space fission power system. The Heatpipe Bimodal System (HBS) is a potential, near-term, low-cost space fission power and/or propulsion system. Both systems will be composed of independent modules, and all components use existing technology and operate within the existing database. The HPS and HBS have relatively few system integration issues; thus, the successful development of a module is a significant step toward verifying system feasibility and performance estimates. A prototypic HPS module was fabricated, and initial testing was completed in April 1997. All test objectives were accomplished, demonstrating the basic feasibility of the HPS. Fabrication of an HBS module is under way, and testing should begin in 1999.

Poston, David I.; Houts, Michael G.; Emrich, William J.

1999-01-01

124

Development of ceramic superconductors for electric power applications  

SciTech Connect

The U.S. Department of Energy supports an applied superconductivity program entitled {open_quotes}Superconductivity Program for Electric Power Systems.{close_quotes} Activities under this program are designed to help develop the high-temperature superconductor (HTS) technology that is needed for industry to proceed with the commercial development of electric power applications. Research is conducted in three categories: wire development, systems technology development, and Superconductivity Partnership Initiative (SPI). Wire development activities are devoted to improving the critical current density (J{sub c}) of short-length HTS wire, whereas activities in systems technology development focus on fabrication of long-length wires, coils, and magnets. Finally, SPI activities focus on the development of prototypes that consist of a generator coil, a fault current limiter, a transmission cable, and a motor. A current overview and recent progress in the development of HTSs are outlined in this paper. 48 refs., 6 figs.

Balachandran, U.

1997-03-01

125

Development of an analytical tool to study power quality of AC power systems for large spacecraft  

NASA Technical Reports Server (NTRS)

A harmonic power flow program applicable to space power systems with sources of harmonic distortion is described. The algorithm is a modification of the Electric Power Research Institute's HARMFLO program which assumes a three phase, balanced, AC system with loads of harmonic distortion. The modified power flow program can be used with single phase, AC systems. Early results indicate that the required modifications and the models developed are quite adequate for the analysis of a 20 kHz testbed built by General Dynamics Corporation. This is demonstrated by the acceptable correlation of present results with published data. Although the results are not exact, the discrepancies are relatively small.

Kraft, L. Alan; Kankam, M. David

1991-01-01

126

Development of an analytical tool to study power quality of ac power systems for large spacecraft  

NASA Technical Reports Server (NTRS)

A harmonic power flow program applicable to space power systems with sources of harmonic distortion is described. The algorithm is a modification of Electric Power Research Institute's HARMFLO program which assumes a three-phase, balanced, ac system with loads of harmonic distortion. The modified power flow program can be used with single phase, ac systems. Early results indicate that the required modifications and the models developed are quite adequate for the analysis of a 20-kHz testbed built by General Dynamics Corporation. This is demonstrated by the acceptable correlation of the present results with published data. Although the results are not exact, the discrepancies are relatively small.

Kraft, L. A.; Kankam, M. D.

1991-01-01

127

Development status of the small community solar power system  

NASA Technical Reports Server (NTRS)

The development status and test results for the Small Community Solar Thermal Power Experiment are presented. Activities on the phase 2 power module development effort are presented with emphasis on the receiver, the plant control subsystem, and the energy transport subsystem. The components include a single prototype power module consisting of a parabolic dish concentrator, a power conversion assembly (PCA), and a multiple-module plant control subsystem. The PCA consists of a cavity receiver coupled to an organic Rankine cycle engine-alternator unit defined as the power conversion subsystem; the PCA is mounted at the focus of a parabolic dish concentrator. At a solar insolation of 100 W/sq m and ambient temperature of 28 C (82 F), the power module produces approximately 20 kW of 3-phase, 3 kHz ac power, depending on the concentrator employed. A ground-mounted rectifier to the central collection site where it is supplied directly to the common dc bus which collects the power from all modules in the plant.

Pons, R. L.

1982-01-01

128

Ultra-low power microwave CHFET integrated circuit development  

SciTech Connect

This report summarizes work on the development of ultra-low power microwave CHFET integrated circuit development. Power consumption of microwave circuits has been reduced by factors of 50--1,000 over commercially available circuits. Positive threshold field effect transistors (nJFETs and PHEMTs) have been used to design and fabricate microwave circuits with power levels of 1 milliwatt or less. 0.7 {micro}m gate nJFETs are suitable for both digital CHFET integrated circuits as well as low power microwave circuits. Both hybrid amplifiers and MMICs were demonstrated at the 1 mW level at 2.4 GHz. Advanced devices were also developed and characterized for even lower power levels. Amplifiers with 0.3 {micro}m JFETs were simulated with 8--10 dB gain down to power levels of 250 microwatts ({mu}W). However 0.25 {micro}m PHEMTs proved superior to the JFETs with amplifier gain of 8 dB at 217 MHz and 50 {mu}W power levels but they are not integrable with the digital CHFET technology.

Baca, A.G.; Hietala, V.M.; Greenway, D.; Sloan, L.R.; Shul, R.J.; Muyshondt, G.P.; Dubbert, D.F.

1998-04-01

129

Innovation on Energy Power Technology (13)Development of Geothermal Power Generating Facilities  

NASA Astrophysics Data System (ADS)

The geothermal power generating facilities that utilize the geothermal energy from the earth are environment-friendly, because they scarcely emit the greenhouse gases such as carbon dioxide (CO2) or the environmental pollution substances such as nitrogen oxides (NOx) and sulfur oxides (SOx). On the other hand, they should work swallowing the geothermal steam that contains much amount of chemical impurities such as hydrogen sulfides (H2S), sulfates (SO42-), chlorides (Cl-), silica (SiO2), etc. Therefore, it is not too much to say that the geothermal power generation is a fight against the chemical impurities. Since the first practical geothermal power generating facility in Japan began operating with a small capacity of 30kW in 1960 at Hakone Kowakien, Japanese manufacturers have been developing geothermal power generating facilities and supplying them worldwide. The geothermal power generation is one of the technical challenges that gives a hope for a sustainable development of the human society.

Sakai, Yoshihiro

130

Current status of SMPRs and manpower development for nuclear power.  

National Technical Information Service (NTIS)

The development of SMPRs could make it possible for countries with small electrical grids to use nuclear power. SMPRs are still in the developing stages and none of them have the capability of good plant performance. Most of the SMPRs are in the 300 MWe r...

M. P. Dias

1994-01-01

131

High power space TWTA development activities for new broadcasting satellites  

NASA Astrophysics Data System (ADS)

This paper describes the development activities including the design, improved performance characteristics and evaluation test results of two types of high power space TWTAs (TWTs and EPCs) of 22 GHz and 12 GHz which will be useful for future high power broadcasting satellites. The typical output power and overall efficiency of 22 GHz, 200 W TWT are 230 W and 48 percent, respectively, with the input power of +8 dBm. The EPC efficiency for this TWT is 90 percent. For the 12 GHz band TWTA, the saturated output power of 420 W and efficiency of 49 percent are obtained for the TWT. The EPC performance will be expected almost the same as that of the 22 GHz band. The techniques for these TWTAs are discussed in detail.

Hoshino, H.; Nakagawa, H.; Morishita, Y.; Koike, T.; Takahashi, K.

132

Development of a multikilowatt ion thruster power processor  

NASA Technical Reports Server (NTRS)

A feasibility study was made of the application of silicon-controlled, rectifier series, resonant inverter, power conditioning technology to electric propulsion power processing operating from a 200 to 400 Vdc solar array bus. A power system block diagram was generated to meet the electrical requirements of a 20 CM hollow cathode, mercury bombardment, ion engine. The SCR series resonant inverter was developed as a primary means of power switching and conversion, and the analog signal-to-discrete-time-interval converter control system was applied to achieve good regulation. A complete breadboard was designed, fabricated, and tested with a resistive load bank, and critical power processor areas relating to efficiency, weight, and part count were identified.

Schoenfeld, A. D.; Goldin, D. S.; Biess, J. J.

1972-01-01

133

Repetitive high energy pulsed power technology development for industrial applications  

SciTech Connect

The technology base for Repetitive High Energy Pulsed Power (RHEPP) was originally developed to support defense program applications. As RHEPP technology matures, its potential for use in commercial applications can be explored based on inherent strengths of high average power, high dose rate, cost efficient scaling with power, and potential for long life performance. The 300 kW, 2 MeV RHEPP II accelerator is now in operation as a designated DOE User Facility, exploring applications where high dose-rate ({gt}10{sup 8}Gy/s) may be advantageous, or very high average power is needed to meet throughput requirements. Material surface and bulk property modification, food safety, and large-scale timber disinfestation are applications presently under development. Work is also in progress to generate the reliability database required for the design of 2{sup nd} generation systems. {copyright} {ital 1997 American Institute of Physics.}

Schneider, L.X.; Reed, K.W.; Kaye, R.J. [Sandia National Laboratories, Albuquerque, New Mexico 87185-1152 (United States)

1997-02-01

134

Repetitive high energy pulsed power technology development for industrial applications  

SciTech Connect

The technology base for Repetitive High Energy Pulsed Power (RHEPP) was originally developed to support defense program applications. As RHEPP technology matures, its potential for use in commercial applications can be explored based on inherent strengths of high average power, high dose rate, cost efficient scaling with power, and potential for long life performance. The 300 kW, 2 MeV RHEPP II accelerator is now in operation as a designated DOE User Facility, exploring applications where high dose-rate (> 10{sup 8} Gy/s) may be advantageous, or very high average power is needed to meet throughput requirements. Material surface and bulk property modification, food safety, and large-scale timber disinfestation are applications presently under development. Work is also in progress to generate the reliability database required for the design of 2nd generation systems.

Schneider, L.X.; Reed, K.R.; Kaye, R.J.

1996-10-01

135

The environment power system analysis tool development program  

NASA Technical Reports Server (NTRS)

The Environment Power System Analysis Tool (EPSAT) is being developed to provide space power system design engineers with an analysis tool for determining system performance of power systems in both naturally occurring and self-induced environments. The program is producing an easy to use computer aided engineering (CAE) tool general enough to provide a vehicle for technology transfer from space scientists and engineers to power system design engineers. The results of the project after two years of a three year development program are given. The EPSAT approach separates the CAE tool into three distinct functional units: a modern user interface to present information, a data dictionary interpreter to coordinate analysis; and a data base for storing system designs and results of analysis.

Jongeward, Gary A.; Kuharski, Robert A.; Kennedy, Eric M.; Stevens, N. John; Putnam, Rand M.; Roche, James C.; Wilcox, Katherine G.

1990-01-01

136

Electrical standards development activities for nuclear power plant maintenance  

SciTech Connect

This paper presents information describing the concern for nuclear power plant electrical equipment maintenance and the IEEE Nuclear Power Engineering Committee's method to address that concern. That method includes the creation of Working Group 3.3, ''Maintenance Good Practices'' which is developing specific maintenance good practice documents, supporting technical information exchange, and providing a vehicle to promote practices which can reduce cost and enhance plant safety.

Gradin, L.P.; Sorenson, R.M.

1986-02-01

137

Space Solar Dynamic Power Systems Status and Development  

Microsoft Academic Search

An analysis and design trade study was conducted to compare different solar dynamic power systems(SDPS) for space missions application. Closed Brayton Cycle(CBC), alkali-metal Rankine Cycle(RC), free-piston Stirling Cycle(SC) and cogeneration cycles were evaluated and also compared with each other. Conceptual designs were developed for cogeneration cycles of CBC combining with Organic RC or new two-phase power cycle, the Organic RC

Bin Wu; Yu-ming Xing

2010-01-01

138

DEVELOPMENT OF A SOLAR POWERED DIFFUSION ABSORPTION COOLING MACHINE  

Microsoft Academic Search

This paper is about the development, investigation and simulation of a single-effect solar powered ammonia\\/water (NH3\\/H2O) Diffusion-Absorption Cooling Machine (DACM). The designed cooling capacity of the cooling machine is 2.5 kW at evaporator temperatures ranging between -10°C and +5°C. The indirectly heated, solar powered generator with its bubble pump is the main new feature of this cooling machine. The challenges

Uli Jakob; Ursula Eicker; Ahmad H. Taki; Malcolm J. Cook

139

Current and future developments in diesel powered hovercraft  

NASA Astrophysics Data System (ADS)

After evaluating the development status of the application of diesel power to air-cushion vehicles (ACVs) and surface-effect ships (SESs), attention is given to the AP1-88 ACV, which is both the first and largest operational diesel-powered amphibious craft of this type. An account is given of the ACV and SES features that are dictated by the need to accommodate diesel power sources; the major advantages and disadvantages of diesel (vs gas turbine) engines are discussed. Although cost reductions are achievable against gas turbine powerplant use, lower payload fractions and slightly lower performance capabilities appear to be inescapable.

Leonard, J. C.; Stevens, M. J.; Buttigieg, J. A.

140

High power blue LED development using different growth modes  

NASA Astrophysics Data System (ADS)

Blue high brightness light emitting diodes (HB-LEDs) have been developed using different growth modes in the active layers. Piezoelectric field engineering improves the optical output power in multiple quantum well (MQW) LEDs by inserting an optimized transitional superlattice (TSL) before the active MQW layers. Within single quantum well (SQW) LEDs, quasi-Quantum Dot (QD) growth for Indium localization has been realized. The SQW LED output power exceeds the strain engineered MQW LEDs. The experimental data indicates that Indium localization enhances overall quantum efficiency and results in increased output power for HB-LEDs.

Lee, Dong S.; Florescu, Doru I.; Lu, Dong; Ramer, Jeff C.; Merai, Vinod; Parekh, Aniruddh; Begarney, Michael J.; Armour, Eric A.

2004-09-01

141

Geothermal Power Development Resource Evaluation Aspects for Kyushu Electric Power Co., Inc., Fukuoka, Japan  

SciTech Connect

This report is a limited review of and presents comments on the geothermal resource exploration program of Kyushu Electric Power Company (KEPCO). This program is for developing geothermal resources to generate electric power on Kyushu Island, Japan. Many organizations in Japan and in particular Kyushu Electric Power Co., Inc. are actively exploring for and developing geothermal resources on Kyushu Island. KEPCO has already demonstrated an ability and expertise to explore for geothermal resources by their successful exploration and subsequent development of several fields (Hatchobaru and Otake) on the island of Kyushu for electric power generation. The review and comments are made relative to the geothermal resource aspects of Kyushu Electric Power Company's geothermal exploration program, and within the time, budget, and scope of the Rogers Engineering's effort under the existing contract. Rogers and its consultants have had a wide variety of geothermal exploration experience and have used such experience in the analysis of what has been presented by KEPCO. The remainder of the introduction section develops general knowledge concerning geothermal power development with particular emphasis on the resource exploration. The data received section describes the information available to perform the project work. There are no interpretative parts to the data received section. The philosophy section relates our understanding of the KEPCO thinking and conditions surrounding current geothermal resource development in Japan. The survey and methods sections presents three important items about each study KEPCO has performed in the resource exploration program. These three aspects are: what should be obtained from the method, what data was obtained and presented, and what is a review and analysis of where the KEPCO exploration program is currently in terms of progress and successful location of reservoirs. The final section presents recommendations on the many aspects of the resource exploration for geothermal power development.

None

1980-10-30

142

Development of an Organic Rankine-Cycle Power Module for a Small Community Solar Thermal Power Experiment.  

National Technical Information Service (NTIS)

An organic Rankine-cycle (ORC) power module was developed for use in a multimodule solar power plant to be built and operated in a small community. Many successful components and subsystems, including the reciever, power conversion subsystem, energy trans...

T. Kiceniuk

1985-01-01

143

Utilization of recently developed codes for high power Brayton and Rankine cycle power systems  

NASA Technical Reports Server (NTRS)

Two recently developed FORTRAN computer codes for high power Brayton and Rankine thermodynamic cycle analysis for space power applications are presented. The codes were written in support of an effort to develop a series of subsystem models for multimegawatt Nuclear Electric Propulsion, but their use is not limited just to nuclear heat sources or to electric propulsion. Code development background, a description of the codes, some sample input/output from one of the codes, and state future plans/implications for the use of these codes by NASA's Lewis Research Center are provided.

Doherty, Michael P.

1993-01-01

144

Development status of the NSTAR ion propulsion system power processor  

NASA Astrophysics Data System (ADS)

A 0.5-2.3 kW xenon ion propulsion system is presently being developed under the NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) program. This propulsion system includes a 30 cm diameter xenon ion thruster, a Digital Control Interface Unit, a xenon feed system, and a power processing unit (PPU). The PPU consists of the power supply assemblies which operate the thruster neutralizer, main discharge chamber, and ion optics. Also included are recycle logic and a digital microcontroller. The neutralizer and discharge power supplies employ a dual use configuration which combines the functions of two power supplies into one, significantly simplifying the PPU. Further simplification was realized by implementing a single thruster control loop which regulates the beam current via the discharge current. Continuous throttling is possible over a 0.5-2.3 kW output power range. All three power supplies have been fabricated and tested with resistive loads, and have been combined into a single breadboard unit with the recycle logic and microcontroller. All line and load regulation test results show the power supplies to be within the NSTAR flight PPU specified power output of 1.98 kW. The overall efficiency of the PPU, calculated as the combined efficiencies of the power supplies and controller, at 2.3 kW delivered to resistive loads was 0.90. The component was 6.16 kg. Integration testing of the neutralizer and discharge power supplies with a functional model thruster revealed no issues with discharge ignition or steady state operation.

Hamley, John A.; Pinero, Luis R.; Rawlin, Vincent K.; Miller, John R.; Cartier, Kevin C.; Bowers, Glen E.

1995-10-01

145

Development status of the NSTAR ion propulsion system power processor  

NASA Technical Reports Server (NTRS)

A 0.5-2.3 kW xenon ion propulsion system is presently being developed under the NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) program. This propulsion system includes a 30 cm diameter xenon ion thruster, a Digital Control Interface Unit, a xenon feed system, and a power processing unit (PPU). The PPU consists of the power supply assemblies which operate the thruster neutralizer, main discharge chamber, and ion optics. Also included are recycle logic and a digital microcontroller. The neutralizer and discharge power supplies employ a dual use configuration which combines the functions of two power supplies into one, significantly simplifying the PPU. Further simplification was realized by implementing a single thruster control loop which regulates the beam current via the discharge current. Continuous throttling is possible over a 0.5-2.3 kW output power range. All three power supplies have been fabricated and tested with resistive loads, and have been combined into a single breadboard unit with the recycle logic and microcontroller. All line and load regulation test results show the power supplies to be within the NSTAR flight PPU specified power output of 1.98 kW. The overall efficiency of the PPU, calculated as the combined efficiencies of the power supplies and controller, at 2.3 kW delivered to resistive loads was 0.90. The component was 6.16 kg. Integration testing of the neutralizer and discharge power supplies with a functional model thruster revealed no issues with discharge ignition or steady state operation.

Hamley, John A.; Pinero, Luis R.; Rawlin, Vincent K.; Miller, John R.; Cartier, Kevin C.; Bowers, Glen E.

1995-01-01

146

Soft-Fault Detection Technologies Developed for Electrical Power Systems  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center, partner universities, and defense contractors are working to develop intelligent power management and distribution (PMAD) technologies for future spacecraft and launch vehicles. The goals are to provide higher performance (efficiency, transient response, and stability), higher fault tolerance, and higher reliability through the application of digital control and communication technologies. It is also expected that these technologies will eventually reduce the design, development, manufacturing, and integration costs for large, electrical power systems for space vehicles. The main focus of this research has been to incorporate digital control, communications, and intelligent algorithms into power electronic devices such as direct-current to direct-current (dc-dc) converters and protective switchgear. These technologies, in turn, will enable revolutionary changes in the way electrical power systems are designed, developed, configured, and integrated in aerospace vehicles and satellites. Initial successes in integrating modern, digital controllers have proven that transient response performance can be improved using advanced nonlinear control algorithms. One technology being developed includes the detection of "soft faults," those not typically covered by current systems in use today. Soft faults include arcing faults, corona discharge faults, and undetected leakage currents. Using digital control and advanced signal analysis algorithms, we have shown that it is possible to reliably detect arcing faults in high-voltage dc power distribution systems (see the preceding photograph). Another research effort has shown that low-level leakage faults and cable degradation can be detected by analyzing power system parameters over time. This additional fault detection capability will result in higher reliability for long-lived power systems such as reusable launch vehicles and space exploration missions.

Button, Robert M.

2004-01-01

147

Development of decommissioning technology for nuclear power plants  

NASA Astrophysics Data System (ADS)

More than 30 years have already passed since the first commercial nuclear power plant in Japan was put in operation. Presently, about 50 commercial nuclear power plants (NPPs) are operating and in the future NPP will be ceased the operation and the plant will be decommissioned. NUPEC has been developing the decommissioning technology undertaking the safe, secure, and rational decommissioning for NPPs since 1982. NUPEC has focused its development effort on techniques for decontamination before dismantling, reactor facility dismantling, measurement of residual radioactivity in buildings, waste decontamination, recycling.

Ogawa, Nagano; Saishu, Sadanori; Ishikura, Takeshi

2000-01-01

148

The electric power system of the International Space Station-a platform for power technology development  

Microsoft Academic Search

The electrical power system developed for the International Space Station represents the largest space-based power system ever designed and, consequently, has driven some key technology aspects and operational challenges. The full U.S.-built system consists of a 160 V DC primary network, and a more tightly regulated 120 V DC secondary network. Additionally, the U.S. system interfaces with the 28 V

Eric B. Gietl; Edward W. Gholdston; Bruce A. Manners; Rex A. Delventhal

2000-01-01

149

Simplified models of a single-phase power electronic inverter for railway power system stability analysis—Development and evaluation  

Microsoft Academic Search

Use of power electronic equipment has increased and introduced new dynamical phenomena in power systems. For example, new electric rail vehicles (locomotives) equipped with modern power electronic traction chains have caused situations of low-frequency power oscillations and instability in single-phase railway power supply systems. This paper presents the development and implementation of an instantaneous value model and simplified fundamental frequency

Steinar Danielsen; Olav B. Fosso; Marta Molinas; Jon Are Suul; Trond Toftevaag

2010-01-01

150

The MGX: A high power, pulsed microwave generator development project  

NASA Astrophysics Data System (ADS)

Lawrence Livermore National Laboratory. It will be used for high-power microwave vulnerability and lethality studies, investigation of air breakdown, and high-power microwave diagnostic development. The microwave source, a virtual cathode oscillator (VIRCATOR), is initially designed to operate at 8 GHz, with an output power greater than 1 GW, and 70 ns pulse width. The pulsed power source is a modified one-unit FXR Blumlein system charged to approximately 650 kV. A new insulator and electron-beam diode have been designed. In addition, a water-breakdown gap has been included to suppress diode prepulse and to sharpen the pulse rise time. The VIRCATOR has extensively modeled with the MASK code at LINI. Preliminary results are presented.

Scarpetti, R.; Vogtlin, G.; Lundberg, R.; Burkhart, S.; Hofer, W.

1983-06-01

151

Newly developed high-power laser diode bars  

NASA Astrophysics Data System (ADS)

High Power Laser Diode (LD) modules are widely used as high-brightness light sources for pumping solid-state lasers and for direct diode laser processing utilizing a compact feature. The LD bars installed in modules are required with higher output power, efficiency and beam quality. We have optimized the LD bar structure for high output power and efficient operation. The water-cooled heat sink has been designed for excellent thermal performance as well as long-term stable cooling performance. We have also developed the thermal expansion controlled assembly technique to suppress the "smile". As a result, we have achieved an output power of over 200 W and a conversion efficiency of 58% from 940 nm LD bars under continuous wave (CW) operation with very low smile of 0.8 ?m.

Kageyama, Nobuto; Morita, Takenori; Torii, Kousuke; Takauji, Motoki; Nagakura, Takehito; Maeda, Junya; Miyajima, Hirofumi; Yoshida, Harumasa

2012-02-01

152

Middle Eastern power systems; Present and future developments  

SciTech Connect

Middle Eastern Power systems have evolved independently of each other over many decades. The region covers a wide geographical area of over 4 million square kilometers with an estimated population in 1990 of over 120 million people. This paper discusses the present status and future power system developments in the Middle East with emphasis on the Mashrequ Arab Countries (MAC). MAC consists of Egypt, Iraq, Jordan, Lebanon, Syria, Yemen, and the six Gulf Cooperation Council (GCC) countries, namely, Bahrain, Kuwait, Qatar, Saudi Arabia, Oman, and the United Arab Emirates (UAE). Interconnections within MAC and possible extensions to Turkey, Europe, and Central Africa are discussed. A common characteristic of the MAC power systems is that they are all operated by government or semi-government bodies. The energy resources in the region are varied. Countries such as Iraq, Egypt, and Syria have significant hydro power resources. On the other hand, the GCC countries and Iraq have abundant fossil fuel reserves.

Not Available

1992-06-01

153

Development of lightweight radiators for lunar based power systems  

NASA Astrophysics Data System (ADS)

This report discusses application of a new lightweight carbon-carbon (C-C) space radiator technology developed under the NASA Civil-Space Technology Initiative (CSTI) High Capacity Power Program to a 20 kWe lunar based power system. This system comprises a nuclear (SP-100 derivative) heat source, a Closed Brayton Cycle (CBC) power conversion unit with heat rejection by means of a plane radiator. The new radiator concept is based on a C-C composite heat pipe with integrally woven fins and a thin walled metallic liner for containment of the working fluid. Using measured areal specific mass values (1.5 kg/m2) for flat plate radiators, comparative CBC power system mass and performance calculations show significant advantages if conventional heat pipes for space radiators are replaced by the new C-C heat pipe technology.

Juhasz, Albert J.; Bloomfield, Harvey S.

1994-05-01

154

Development of a dual-field heteropoplar power converter  

NASA Technical Reports Server (NTRS)

The design and testing of a 400 watt, dual phase, dual rotor, field modulated inductor alternator is described. The system is designed for use as a flywheel to ac utility line or flywheel to dc bus (electric vehicle) power converter. The machine is unique in that it uses dual rotors and separately controlled fields to produce output current and voltage which are in phase with each other. Having the voltage and current in phase allows the power electronics to be made of simple low cost components. Based on analytical predictions and experimental results, development of a complete 22 kilowatt (30 Hp) power conversion system is recommended. This system would include power electronics and controls and would replace the inductor alternator with an improved electromagnetic conversion system.

Eisenhaure, D. B.; Johnson, B.; Bliamptis, T.; St. George, E.

1981-01-01

155

A Practical Approach to Starting Fission Surface Power Development  

SciTech Connect

The Prometheus Power and Propulsion Program has been reformulated to address NASA needs relative to lunar and Mars exploration. Emphasis has switched from the Jupiter Icy Moons Orbiter (JIMO) flight system development to more generalized technology development addressing Fission Surface Power (FSP) and Nuclear Thermal Propulsion (NTP). Current NASA budget priorities and the deferred mission need date for nuclear systems prohibit a fully funded reactor Flight Development Program. However, a modestly funded Advanced Technology Program can and should be conducted to reduce the risk and cost of future flight systems. A potential road-map for FSP technology development leading to possible flight applications could include three elements: 1) Conceptual Design Studies, 2) Advanced Component Technology, and 3) Non-Nuclear System Testing. The Conceptual Design Studies would expand on recent NASA and DOE analyses while increasing the depth of study in areas of greatest uncertainty such as reactor integration and human-rated shielding. The Advanced Component Technology element would address the major technology risks through development and testing of reactor fuels, structural materials, primary loop components, shielding, power conversion, heat rejection, and power management and distribution (PMAD). The Non-Nuclear System Testing would provide a modular, technology test-bed to investigate and resolve system integration issues. (author)

Mason, Lee [NASA Glenn Research Center, 21000 Brook Park Road, Cleveland, Ohio 44135 (United States)

2006-07-01

156

Progress in High Power Free-Piston Stirling Convertor Development  

NASA Technical Reports Server (NTRS)

The U.S. Space Exploration Policy has established a vision for human exploration of the moon and Mars. One option for power for future outposts on the lunar and Martian surfaces is a nuclear reactor coupled with a free-piston Stirling convertor at a power level of 30-40 kWe. A 25 kW convertor was developed in the 1990s under the SP-100 program. This system consisted of two 12.5 kWe engines connected at their hot ends and mounted in tandem to cancel vibration. Recently, NASA began a new project with Auburn University to develop a 5 kWe, single convertor for use in such a possible lunar power system. Goals of this development program include a specific power in excess of 140 We/kg at the convertor level, lifetime in excess of five years and a control system that will safely manage the convertors in case of an emergency. Foster-Miller, Inc. is developing the 5 kWe Stirling Convertor Assembly. The characteristics of the design along with progress in developing the system will be described.

Brandhorst, Henry W., Jr.; Kirby, Raymond L.; Chapman, Peter A.; Walter, Thomas J.

2008-01-01

157

A Practical Approach to Starting Fission Surface Power Development  

NASA Technical Reports Server (NTRS)

The Prometheus Power and Propulsion Program has been reformulated to address NASA needs relative to lunar and Mars exploration. Emphasis has switched from the Jupiter Icy Moons Orbiter (JIMO) flight system development to more generalized technology development addressing Fission Surface Power (FSP) and Nuclear Thermal Propulsion (NTP). Current NASA budget priorities and the deferred mission need date for nuclear systems prohibit a fully funded reactor Flight Development Program. However, a modestly funded Advanced Technology Program can and should be conducted to reduce the risk and cost of future flight systems. A potential roadmap for FSP technology development leading to possible flight applications could include three elements: 1) Conceptual Design Studies, 2) Advanced Component Technology, and 3) Non-Nuclear System Testing. The Conceptual Design Studies would expand on recent NASA and DOE analyses while increasing the depth of study in areas of greatest uncertainty such as reactor integration and human-rated shielding. The Advanced Component Technology element would address the major technology risks through development and testing of reactor fuels, structural materials, primary loop components, shielding, power conversion, heat rejection, and power management and distribution (PMAD). The Non-Nuclear System Testing would provide a modular, technology testbed to investigate and resolve system integration issues.

Mason, Lee S.

2006-01-01

158

Power Systems Development Facility Gasification Test Campaing TC14  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high pressure solids handling systems. This report details test campaign TC14 of the PSDF gasification process. TC14 began on February 16, 2004, and lasted until February 28, 2004, accumulating 214 hours of operation using Powder River Basin (PRB) subbituminous coal. The gasifier operating temperatures varied from 1760 to 1810 F at pressures from 188 to 212 psig during steady air blown operations and approximately 160 psig during oxygen blown operations.

Southern Company Services

2004-02-28

159

Early history of Korean electric light and power development  

Microsoft Academic Search

This paper attempted to serve as a research for the revival of the electric light plant (Jeondeungso) erected at the Gyeongbokgung Palace in 1887. This report provided a chronological overview of the development of electric light and power in late Joseon dynasty (Korea) before 1900's. It mainly focused on the establishment of light plant in the palace and the erection

Moon-Hyon Nam

2007-01-01

160

Development and Calibration of Rogowski coils for pulsed power systems  

Microsoft Academic Search

Rogowski coils have been used for decades for non-invasive current measurement when other probe, such as current shunts, current transformers are impracticable. The measurement of diode beam current in pulse power system under vacuum and high voltage are challenging task which requires development of Rogowski coil for specific applications. They operate in large radiation fields, under intense electron bombardment and

P. C. Saroj; Ritu Agrawal; A. Roy; R. Menon; Sandeep Singh; S. R. Raul; M. R. Kulkarni; Archana Sharma; K. V. Nagesh; D. P. Chakravarthy

2011-01-01

161

An ICF (Inertial Confinement Fusion) power plant development program  

SciTech Connect

The development of Inertial Confinement Fusion (ICF) as a power source will require demonstrating four principal objectives: ignition and propagating burn, adequate gain ({eta}G {approx gt} 10) at low drive energy for the reactor driver, reactor pulse rates of a few Hz, and the long-term reliability and economics of a reactor. Additionally, the potential value and applicability of special-purpose ICF reactors, such as tritium breeding reactors and reactors for burning high level fission waste (actinide and fission products) should be investigated. To keep development time and costs to a minimum these should be accomplished with as few major facilities as possible, and subsystems should be developed only as they are needed. A viable scenario for Inertial Fusion Energy (IFE) would include establishing the first milestone in the National Academy of Sciences (NAS) and Fusion Policy Advisory Committee (FPAC) recommended Nova Upgrade, and the latter three in an Engineering Test Facility (ETF)/Demonstration Power Plant (DPP), i.e. two major facilities. To be successful in so short a time, operations at the major facilities would have to be supported by off-line reactor driver and other technology development. The program plan discussed here assumes that enhanced funding is available beginning in FY 1992. It is estimated that such a program could provide a prototype IFE power plant by the second decade of the 21st century and make commercial power available in mid to late 2020s.

Storm, E.; Hogan, W.J.; Lindl, J.D.

1990-06-05

162

DEVELOPMENT OF AN RFQ INPUT POWER COUPLING SYSTEM  

Microsoft Academic Search

Development of RF power coupling system for a radio frequency quadrupole (RFQ) accelerating structure for operation at 402.5 MHz is presented. The system employs two coaxial loop couplers for reliable operation. Each coupler has a coaxial loop antenna that is fed through a coaxial alumina ceramic window. The two coaxial couplers are fed through a waveguide magic-T hybrid junction used

Y. W. Kang; A. Vassioutchenko; A. V. Aleksandrov; M. M. Champion; M. S. Champion; M. Crofford; P. Gibson; H. L. Haenichen; T. Hardek; P. Ladd; M. P. McCarthy; D. Stout

163

Development of a solar-powered passive ejector cooling system  

Microsoft Academic Search

This paper describes the development of an ejector refrigeration system that is powered by solar thermal energy. The cooling system contains no active parts and is therefore deemed passive. Water is used as the refrigerant though other natural refrigerants could be used for lower temperature operation. A prototype system was built with a nominal cooling capacity of 7 kW. This

V. M Nguyen; S. B Riffat; P. S Doherty

2001-01-01

164

Preliminary working paper: satellite power system and lesser developed countries  

Microsoft Academic Search

The objective of this report is to screen selected countries that, by geographical location, might be appropriate sites for the rectenna system and for which technical, environmental, social, demographic, political, and economic factors make a Satellite Power System (SPS) project appear possible. The study focused on countries that are referred to as Lesser Developed Countries (LDCs). Of 130 countries, sovereignties,

T. E. Oliver; L. T. Ventry; C. DuBois; R. Dhanda

1980-01-01

165

Satellite Power System Concept Development and Evaluation Program  

Microsoft Academic Search

The progress made by the Concept Development and Evaluation Program (CDEP), set up to consider the Satellite Power System (SPS) program, is assessed. It is pointed out that from a technical standpoint the SPS concept now has at least two options for each of the following subsystems: conversion of solar energy to electrical energy; conversion of electrical energy to radio

F. A. Koomanoff; C. A. Sandahl

1980-01-01

166

300-Watt Power Source Development at the Jet Propulsion Laboratory  

NASA Technical Reports Server (NTRS)

This viewgraph presentation reviews the JPL program to develop a 300 Watt direct methanol fuel cell. The immediate use of the fuel cell is to power test instrumentation on armored vehicles. It reviews the challenges, the system design and the system demonstration.

Valdez, Thomas I.

2005-01-01

167

The Hazards Posed by the Global Development of Nuclear Power  

ERIC Educational Resources Information Center

Outlines the growth in the demand for energy on a world-wide basis. Reviews the development of nuclear power and points out the many hazards in the nuclear fuel cycle. Describes the nature of nuclear wastes and explains the quantities involved and the current techniques for waste disposal. (GS)

O'Reilly, S. A.

1976-01-01

168

Recent technical and marketing developments in high power fiber lasers  

Microsoft Academic Search

The presentation discusses recent advances in high power fiber lasers, including new and future fiber laser offerings. Also a review of the impact that fiber lasers are making in the material processing market and new applications that fiber lasers have developed.

B. Shiner

2009-01-01

169

System Planning for Bay of Fundy Tidal Power Developments  

Microsoft Academic Search

This paper focuses attention on the markets that could be served by potential tidal projects in the Bay of Fundy, describes the system considerations and computer models used to analyze the technical and economic viability of such developments and outlines the transmission requirements necessary for their integration into the power system networks. It also details the results of a study

A. N. Karas

1978-01-01

170

Development and advances in conventional high power RF systems  

SciTech Connect

The development of rf systems capable of producing high peak power (hundreds of megawatts) at relatively short pulse lengths (0.1--5 microseconds) is currently being driven mainly by the requirements of future high energy linear colliders, although there may be applications to industrial, medical and research linacs as well. The production of high peak power rf typically involves four basic elements: a power supply to convert ac from the ``wall plug`` to dc; a modulator, or some sort of switching element, to produce pulsed dc power; an rf source to convert the pulsed dc to pulsed rf power; and possibly an rf pulse compression system to further enhance the peak rf power. Each element in this rf chain from wall plug to accelerating structure must perform with high efficiency in a linear collider application, such that the overall system efficiency is 30% or more. Basic design concepts are discussed for klystrons, modulators and rf pulse compression systems, and their present design status is summarized for applications to proposed linear colliders.

Wilson, P.B.

1995-06-01

171

Heat engine development for solar thermal power systems  

NASA Technical Reports Server (NTRS)

The technical status of three heat engines (Stirling, high-temperature Brayton, and Combined cycle) for use in solar thermal power systems is presented. Performance goals necessary to develop a system competitive with conventional power requirements include an external heated engine output less than 40 kW, and efficiency power conversion subsystem at least 40% at rated output, and a half-power efficiency of at least 37%. Results show that the Stirling engine can offer a 39% efficiency with 100 hours of life, and a 20% efficiency with 10,000 hours of life, but problems with seals and heater heads exist. With a demonstrated efficiency near 31% at 1500 F and a minimum lifetime of 100,000 hours, the Brayton engine does not offer sufficient engine lifetime, efficiency, and maintenance for solar thermal power systems. Examination of the Rankine bottoming cycle of the Combined cycle engine reveals a 30 year lifetime, but a low efficiency. Additional development of engines for solar use is primarily in the areas of components to provide a long lifetime, high reliability, and low maintenance (no more than $0.001/kW-hr).

Pham, H. Q.; Jaffe, L. D.

1981-01-01

172

Status of Brayton cycle power conversion development at NASA GRC  

NASA Astrophysics Data System (ADS)

The NASA Glenn Research Center is pursuing the development of Brayton cycle power conversion for various NASA initiatives. Brayton cycle power systems offer numerous advantages for space power generation including high efficiency, long life, high maturity, and broad salability. Candidate mission applications include surface rovers and bases, advanced propulsion vehicles, and earth orbiting satellites. A key advantage is the ability for Brayton converters to span the wide range of power demands of future missions from several kilowatts to multi-megawatts using either solar, isotope, or reactor heat sources. Brayton technology has been under development by NASA since the early 1960's resulting in engine prototypes in the 2 to 15 kW-class that have demonstrated conversion efficiency of almost 30% and cumulative operation in excess of 40,000 hours. Present efforts at GRC are focusing on a 2 kW testbed as a proving ground for future component advances and operational strategies, and a 25 kW engine design as a modular building block for 100 kW-class electric propulsion and Mars surface power applications. .

Mason, Lee S.; Shaltens, Richard K.; Dolce, James L.; Cataldo, Robert L.

2002-01-01

173

Solar Power Satellite Development: Advances in Modularity and Mechanical Systems  

NASA Technical Reports Server (NTRS)

Space solar power satellites require innovative concepts in order to achieve economically and technically feasible designs. The mass and volume constraints of current and planned launch vehicles necessitate highly efficient structural systems be developed. In addition, modularity and in-space deployment will be enabling design attributes. This paper reviews the current challenges of launching and building very large space systems. A building block approach is proposed in order to achieve near-term solar power satellite risk reduction while promoting the necessary long-term technology advances. Promising mechanical systems technologies anticipated in the coming decades including modularity, material systems, structural concepts, and in-space operations are described

Belvin, W. Keith; Dorsey, John T.; Watson, Judith J.

2010-01-01

174

Development and fabrication of an augmented power transistor  

NASA Technical Reports Server (NTRS)

The development of device design and processing techniques for the fabrication of an augmented power transistor capable of fast switching and high voltage power conversion is discussed. The major device goals sustaining voltages in the range of 800 to 1000 V at 80 A and 50 A, respectively, at a gain of 14. The transistor switching rise and fall times were both to have been less than 0.5 microseconds. The development of a passivating glass technique to shield the device high voltage junction from moisture and ionic contaminants is discussed as well as the development of an isolated package that separates the thermal and electrical interfaces. A new method was found to alloy the transistors to the molybdenum disc at a relatively low temperature. The measured electrical performance compares well with the predicted optimum design specified in the original proposed design. A 40 mm diameter transistor was fabricated with seven times the emitter area of the earlier 23 mm diameter device.

Geisler, M. J.; Hill, F. E.; Ostop, J. A.

1983-01-01

175

Development of large wind energy power generation system  

NASA Technical Reports Server (NTRS)

The background and development of an experimental 100 kW wind-energy generation system are described, and the results of current field tests are presented. The experimental wind turbine is a two-bladed down-wind horizontal axis propeller type with a 29.4 m diameter rotor and a tower 28 m in height. The plant was completed in March, 1983, and has been undergoing trouble-free tests since then. The present program calls for field tests during two years from fiscal 1983 to 1984. The development of technologies relating to the linkage and operation of wind-energy power generation system networks is planned along with the acquisition of basic data for the development of a large-scale wind energy power generation system.

1985-01-01

176

Development of high-power holmium-doped fibre amplifiers  

NASA Astrophysics Data System (ADS)

Resonantly pumped holmium fibre lasers present a range of opportunities for the development of novel fibre laser and amplifier devices due to the availability of mature, efficient high power thulium fibre pump lasers. In this paper we describe the operation of a large mode area holmium-doped fibre amplifier. The master-oscillator is an all-fibre linearly polarised, core pumped single mode laser operating at 27 W at 2.11 ?m. This laser was amplified in a large mode area fibre producing up to 265 W of output power. This system is the first demonstration of a resonantly pumped holmiumdoped fibre amplifier. It is also the highest power fibre amplifier that is capable of operating in an atmospheric transmission window <2.05 ?m. This monolithic all-fibre system is able to address a wide range of remote sensing, scientific, medical and defence applications.

Hemming, Alexander; Simakov, Nikita; Davidson, Alan; Oermann, Michael; Corena, Len; Stepanov, Dmitrii; Carmody, Neil; Haub, John; Swain, Robert; Carter, Adrian

2014-03-01

177

Material Science Developments Enhancing Excess of Power Reproducibility  

NASA Astrophysics Data System (ADS)

Material science research activities have been carried out in order to increase the reproducibility of the excess of power production during electrochemical loading of palladium with deuterium. In the past a wide work was developed to obtain a metallurgical structure of the palladium able to ensure a significant loading of deuterium above the threshold of 0.95 (D/Pd atomic fraction). It was observed that the high loading of the Pd cathode with deuterium was a necessary condition to have the occurrence of the excess of power production. The more recent work was mainly oriented to optimize the material properties in order to have a significant improvement of the reproducibility of the excess of power. During the last campaign of experiments more than 50% of the experienced cathodes produced excess of heat ranging from 30% up to more than 100% of the input.

Violante, V.; Bertolotti, M.; Castagna, E.; McKubre, M.; Sarto, F.; Sibilia, C.; Tanzella, F.; Zilov, T.

2007-03-01

178

Power console development for NASA's electric propulsion outreach program  

NASA Technical Reports Server (NTRS)

NASA LeRC is developing a 30 cm diameter xenon ion thruster for auxiliary and primary propulsion applications. To maximize expectations for user-acceptance of ion propulsion technology, NASA LeRC, through their Electric Propulsion Outreach Program, is providing sectors of industry with portable power consoles for operation of 5 KW-class xenon ion thrusters. This power console provides all necessary functions to permit thruster operations over a 0.5-5 KW envelope under both manual and automated control. These functions include the following: discharge, cathode heater, neutralizer keeper, and neutralizer heater currents, screen and accelerator voltages, and a gas feed system to regulate and control propellant flow to the thruster. An electronic circuit monitors screen and accelerator currents and controls arcing events. The power console was successfully integrated with the NASA 30 cm thruster.

Pinero, Luis R.; Patterson, Michael J.; Satterwhite, Vincent E.

1993-01-01

179

Development of the small community solar power system  

NASA Technical Reports Server (NTRS)

The status of the Small Community Solar Thermal Power Experiment is presented. Activities on the Phase 2 single/module development effort are presented, together with plans for the Phase 3 1 MWe demonstration plant. A description of the various subsystems and components is given with emphasis on the unmanned microprocessor based plant control subsystem. Latest performance figures are given for the 1 MWe plant, based on 56 power modules, each consisting of a 12m low cost concentrator, a cavity receiver, a Rankine power conversion subsystem and a ground mounted solid-state rectifier. Overall plant efficiency at rated conditions is 15.8 percent. Advanced glass concentrator designs yield 20 percent overall efficiencies.

Babbe, R. H.

1981-01-01

180

Power electronics development for the SPT-100 thruster  

NASA Technical Reports Server (NTRS)

Russian electric propulsion technologies have recently become available on the world market. Of significant interest is the Stationary Plasma Thruster (SPT) which has a significant flight heritage in the former Soviet space program. The SPT has performance levels of up to 1600 seconds of specific impulse at a thrust efficiency of 0.50. Studies have shown that this level of performance is well suited for stationkeeping applications, and the SPT-100, with a 1.35 kW input power level, is presently being evaluated for use on Western commercial satellites. Under a program sponsored by the Innovative Science and Technology Division of the Ballistic Missile Defense Organization, a team of U.S. electric propulsion specialists observed the operation of the SPT-100 in Russia. Under this same program, power electronics were developed to operate the SPT-100 to characterize thruster performance and operation in the U.S. The power electronics consisted of a discharge, cathode heater, and pulse igniter power supplies to operate the thruster with manual flow control. A Russian designed matching network was incorporated in the discharge supply to ensure proper operation with the thruster. The cathode heater power supply and igniter were derived from ongoing development projects. No attempts were made to augment thruster electromagnet current in this effort. The power electronics successfully started and operated the SPT-100 thruster in performance tests at NASA Lewis, with minimal oscillations in the discharge current. The efficiency of the main discharge supply was measured at 0.92, and straightforward modifications were identified which could increase the efficiency to 0.94.

Hamley, John A.; Hill, Gerald M.; Sankovic, John M.

1994-01-01

181

Power electronics development for the SPT-100 thruster  

NASA Astrophysics Data System (ADS)

Russian electric propulsion technologies have recently become available on the world market. Of significant interest is the Stationary Plasma Thruster (SPT) which has a significant flight heritage in the former Soviet space program. The SPT has performance levels of up to 1600 seconds of specific impulse at a thrust efficiency of 0.50. Studies have shown that this level of performance is well suited for stationkeeping applications, and the SPT-100, with a 1.35 kW input power level, is presently being evaluated for use on Western commercial satellites. Under a program sponsored by the Innovative Science and Technology Division of the Ballistic Missile Defense Organization, a team of U.S. electric propulsion specialists observed the operation of the SPT-100 in Russia. Under this same program, power electronics were developed to operate the SPT-100 to characterize thruster performance and operation in the U.S. The power electronics consisted of a discharge, cathode heater, and pulse igniter power supplies to operate the thruster with manual flow control. A Russian designed matching network was incorporated in the discharge supply to ensure proper operation with the thruster. The cathode heater power supply and igniter were derived from ongoing development projects. No attempts were made to augment thruster electromagnet current in this effort. The power electronics successfully started and operated the SPT-100 thruster in performance tests at NASA Lewis, with minimal oscillations in the discharge current. The efficiency of the main discharge supply was measured at 0.92, and straightforward modifications were identified which could increase the efficiency to 0.94.

Hamley, John A.; Hill, Gerald M.; Sankovic, John M.

1994-02-01

182

Technology Development for a Stirling Radioisotope Power System  

NASA Technical Reports Server (NTRS)

NASA Glenn Research Center and the Department of Energy are developing a Stirling convertor for an advanced radioisotope power system to provide spacecraft on-board electric power for NASA deep space missions. NASA Glenn is addressing key technology issues through the use of two NASA Phase II SBIRs with Stirling Technology Company (STC) of Kennewick, WA. Under the first SBIR, STC demonstrated a synchronous connection of two thermodynamically independent free-piston Stirling convertors and a 40 to 50 fold reduction in vibrations compared to an unbalanced convertor. The second SBIR is for the development of an Adaptive Vibration Reduction System (AVRS) that will essentially eliminate vibrations over the mission lifetime, even in the unlikely event of a failed convertor. This paper presents the status and results for these two SBIR projects and also discusses a new NASA Glenn in-house project to provide supporting technology for the overall Stirling radioisotope power system development. Tasks for this new effort include convertor performance verification, controls development, heater head structural life assessment, magnet characterization and thermal aging tests, FEA analysis for a lightweight alternator concept, and demonstration of convertor operation under launch and orbit transfer load conditions.

Thieme, Lanny G.; Qiu, Songgang; White, Maurice A.

2000-01-01

183

West European nuclear power generation research and development  

SciTech Connect

This report assesses the status of West European research and development (R D) in support of nuclear power generation. The focus is on light-water reactors (LWRs), as they will likely be the only concept commerically implemented within the next decade. To a laser degree, alternative concepts such as the high-temperature gas cooled reactor and the liquid-metal reactor (LMR) are also assessed. To bound the study, only the fuel cycle stages of fuel fabrication, power generation, and fuel reprocessing are considered. Under the topic of power generation, the subtopics of core reactor physics, materials, instrumentation and control systems, nuclear power safety, and power plant fabrication and construction are addressed. The front-end fuel cycle stages of mining and milling, conversion and enrichment, and the back-end fuel cycle stages of waste conditioning and disposal and not considered. Most assessments for light-water reactor R D are completed on a country-by-country basis since there is limited cooperation among the West European countries due to the commercial relevance of R D in this area.

Turinsky, P.J.; Baron, S.; Burch, W.D.; Corradini, M.L.; Lucas, G.E.; Matthews, R.B.; Uhrig, R.E.

1991-09-01

184

West European nuclear power generation research and development  

SciTech Connect

This report assesses the status of West European research and development (R&D) in support of nuclear power generation. The focus is on light-water reactors (LWRs), as they will likely be the only concept commerically implemented within the next decade. To a laser degree, alternative concepts such as the high-temperature gas cooled reactor and the liquid-metal reactor (LMR) are also assessed. To bound the study, only the fuel cycle stages of fuel fabrication, power generation, and fuel reprocessing are considered. Under the topic of power generation, the subtopics of core reactor physics, materials, instrumentation and control systems, nuclear power safety, and power plant fabrication and construction are addressed. The front-end fuel cycle stages of mining and milling, conversion and enrichment, and the back-end fuel cycle stages of waste conditioning and disposal and not considered. Most assessments for light-water reactor R&D are completed on a country-by-country basis since there is limited cooperation among the West European countries due to the commercial relevance of R&D in this area.

Turinsky, P.J.; Baron, S.; Burch, W.D.; Corradini, M.L.; Lucas, G.E.; Matthews, R.B.; Uhrig, R.E.

1991-09-01

185

Long Duration Balloon Maximum Power Point Tracking (MPPT) solar power system development  

NASA Astrophysics Data System (ADS)

High altitude scientific balloons have been used for many years to provide scientists with access to near space at a fraction of the cost of satellite based or sounding rocket experiments. In recent years, these balloons have been successfully used for long duration missions of up to 40 days. Longer missions, with durations of up to 100 days (Ultra Long), are in the planning stages. Due to the flight durations, solar power systems have been utilized throughout the Long Duration Balloon (LDB) flight program to power the necessary electronic systems. Recently, Maximum Power Point Tracking (MPPT) charge controllers have become available off-the-shelf. These controllers along with high efficiency mono-crystalline solar cells have become reliable, low cost solutions even in the harsh environments they operate in. The LDB program at the Columbia Scientific Balloon Facility (CSBF) began supporting solar power systems with custom units fabricated by the Physical Science Laboratory (PSL) of New Mexico State University (NMSU). These charge controllers proved to be very reliable systems; however, they required intensive labor to build and were relatively expensive. As off-the-shelf MPPT charge controllers have become available, they have been integrated into the LDB flight support systems. Coupled with PSL developed interface electronics for monitoring and power switching, they have proven to be as reliable, less expensive, and more efficient. The addition of MPPT allows for the controller to operate the solar panel at it highest power production point. Newer, off-the-shelf controllers with smarter MPPT, are currently being tested. This paper describes the long and ultra-long balloon missions and the role that solar power plays in mission success. More importantly, it discusses the recent developments in off-the-shelf MPPT charge controllers configured for use in the harsh high altitude balloon environment.

Perez, Juan

186

High-Power Krypton Hall Thruster Technology Being Developed for Nuclear-Powered Applications  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center has been performing research and development of moderate specific impulse, xenon-fueled, high-power Hall thrusters for potential solar electric propulsion applications. These applications include Mars missions, reusable tugs for low-Earth-orbit to geosynchronous-Earth-orbit transportation, and missions that require transportation to libration points. This research and development effort resulted in the design and fabrication of the NASA-457M Hall thruster that has been tested at input powers up to 95 kW. During project year 2003, NASA established Project Prometheus to develop technology in the areas of nuclear power and propulsion, which are enabling for deep-space science missions. One of the Project-Prometheus-sponsored Nuclear Propulsion Research tasks is to investigate alternate propellants for high-power Hall thruster electric propulsion. The motivation for alternate propellants includes the disadvantageous cost and availability of xenon propellant for extremely large scale, xenon-fueled propulsion systems and the potential system performance benefits of using alternate propellants. The alternate propellant krypton was investigated because of its low cost relative to xenon. Krypton propellant also has potential performance benefits for deep-space missions because the theoretical specific impulse for a given voltage is 20 percent higher than for xenon because of krypton's lower molecular weight. During project year 2003, the performance of the high-power NASA-457M Hall thruster was measured using krypton as the propellant at power levels ranging from 6.4 to 72.5 kW. The thrust produced ranged from 0.3 to 2.5 N at a discharge specific impulse up to 4500 sec.

Jacobson, David T.; Manzella, David H.

2004-01-01

187

2007 Wholesale Power Rate Case Final Proposal : Wholesale Power Rate Development Study.  

SciTech Connect

The Wholesale Power Rate Development Study (WPRDS) serves two primary purposes. It synthesizes information supplied by the other final studies that comprise the BPA rate proposal and shows the actual calculations for BPA's power rates. In addition, the WPRDS is the primary source for certain information used in establishing the power rates. Information developed in the WPRDS includes rate design (including seasonal and diurnal shapes for energy rates, demand, and load variance rates), the risk mitigation tools (Cost Recovery Adjustment Clause (CRAC), along with the [N]ational Marine Fisheries Service [F]ederal Columbia River Power System [B]iological Opinion (NFB) Adjustment, the Emergency NFB Surcharge, and Dividend Distribution Clause (DDC)), development of the Slice rate, and all discounts and other adjustments that are included in the rate schedules and the General Rate Schedule Provisions. The WPRDS also includes the description of the methodology for the Cost of Service Analysis (COSA), and the various rate design steps necessary to establish BPA's power rates. The WPRDS also shows the calculations for inter-business line revenues and expenses, the revenue forecast and, finally, includes a description of all of the rate schedules. The actual rate schedules are shown in ''Administrator's Final Record of Decision (ROD), Appendix A: 2007 Wholesale Power Rate Schedules and General Rate Schedule Provisions, WP-07-A-02''. The WPRDS also includes the Partial Resolution of Issues, shown in Attachment 1 of the ROD. The Partial Resolution of Issues affected many of the features described in this study. These are noted where appropriate.

United States. Bonneville Power Administration.

2006-07-01

188

Development and fabrication of improved Schottky power diodes  

NASA Technical Reports Server (NTRS)

Reproducible methods for the fabrication of silicon Schottky diodes have been developed for tungsten, aluminum, conventional platinum silicide, and low temperature platinum silicide. Barrier heights and barrier lowering under reverse bias have been measured, permitting the accurate prediction of forward and reverse diode characteristics. Processing procedures have been developed that permit the fabrication of large area (about 1 sq cm) mesageometry power Schottky diodes with forward and reverse characteristics that approach theoretical values. A theoretical analysis of the operation of bridge rectifier circuits has been performed, which indicates the ranges of frequency and voltage for which Schottky rectifiers are preferred to p-n junctions. Power Schottky rectifiers have been fabricated and tested for voltage ratings up to 140 volts.

Cordes, L. F.; Garfinkel, M.; Taft, E. A.

1975-01-01

189

Development of lead/acid batteries for photovoltaic power systems  

NASA Astrophysics Data System (ADS)

In order to increase charging efficiency and reduce maintenance such as topping up, lead/acid batteries should not be overcharged. However, when they are used for long periods without overcharging, stratification of the electrolyte can result because the electrolyte is not agitated by the gas evolved during overcharging, thus reducing battery life. In consequence, we have developed two types of lead/acid batteries: vented (Model SLB), and sealed (Model SRE), for photovoltaic power applications.

Tsubota, Masaharu

190

Developing Countries & Global Climate Change: Electric Power Options in Korea  

NSDL National Science Digital Library

The Pew Center on Global Climate Change has recently placed online the October 1999 report entitled "Developing Countries & Global Climate Change: Electric Power Options in Korea." Written by Jin-Gyu Oh and others, the report (.pdf format) discusses the implications of Korea's energy choices -- coal, gas, nuclear, or renewable energy -- and how the chosen "mix of policy, growth, and technology will affect investment costs and the local and global environment."

Chandler, William.; Jo, Sung B.; Kim, Jinwoo.; Logan, Jeffrey.; Oh, Jin-Gyu.; Roh, Dong-Seok.

1999-01-01

191

An ICF (Inertial Confinement Fusion) power plant development program  

Microsoft Academic Search

The development of Inertial Confinement Fusion (ICF) as a power source will require demonstrating four principal objectives: ignition and propagating burn, adequate gain (ηG {approx gt} 10) at low drive energy for the reactor driver, reactor pulse rates of a few Hz, and the long-term reliability and economics of a reactor. Additionally, the potential value and applicability of special-purpose ICF

E. Storm; W. J. Hogan; J. D. Lindl

1990-01-01

192

Power Systems Development Facility Gasification Test Campaign TC20  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coal. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of the first demonstration of the Transport Gasifier following significant modifications of the gasifier configuration. This demonstration took place during test campaign TC20, occurring from August 8 to September 23, 2006. The modifications proved successful in increasing gasifier residence time and particulate collection efficiency, two parameters critical in broadening of the fuel operating envelope and advancing gasification technology. The gasification process operated for over 870 hours, providing the opportunity for additional testing of various gasification technologies, such as PCD failsafe evaluation and sensor development.

Southern Company Services

2006-09-30

193

Development of a high-power vacuum interrupter  

NASA Astrophysics Data System (ADS)

Attempts to develop a vacuum interrupter with a voltage capability in the 72-80 kV range and a current capability in the 63-80 kA range with a continuous current rating of 3000 A are described. Arc physics, vacuum breakdown, mechanical problems, and interrupter fabrication and testing are described. A triggered vacuum gap interrupter of rod array type whose performance in a vacuum was at 63 kA, 97 kV rated voltage was developed. Its application as a very fast, high voltage, high current crowbar switch for protecting power transmission equipment and circuits is considered. The problem of arc transfer is discussed.

Rich, J. A.; Farrall, G. A.; Iman, I.; Sofianek, J. C.

1981-06-01

194

The power of enzyme kinetics in the drug development process.  

PubMed

Drug development is a long and expensive process. It starts from the identification of a small molecule (hit compound) endowed with the ability to suppress a cellular or viral enzyme essential for the development of a given disease and proceeds through subsequent rounds of structural changes and optimization until the desired pharmacological properties are reached (lead compound). At any point of the hit-to-lead optimization process, it is of essence to monitor the behavior of the intermediate molecules with respect to their molecular targets. This involves precise mechanism of action studies as well as quantitative measurement of the performance of the compound against its target. Enzyme kinetic studies are thus an essential component of the drug development process. Relevant examples of the power of enzyme kinetics in the antiviral drug development process will be discussed in the context of anti-HIV chemotherapy. PMID:22429137

Samuele, Alberta; Crespan, Emmanuele; Garbelli, Anna; Bavagnoli, Laura; Maga, Giovanni

2013-06-01

195

Development of Power Assisting Suit for Assisting Nurse Labor  

NASA Astrophysics Data System (ADS)

In order to realize a power assisting suit for assisting a nurse caring a patient in her arm, a hardness sensor of muscle using load cell and a pneumatic rotary actuator utilizing pressure cuffs have been developed. The power assisting suit consists of shoulders, arms, waist and legs made of aluminum, and is fitted on the nurse body. The power assisting suit is originated with the concept of a master and slave system in one body. The arms, waist and legs have the pneumatic rotary actuators. The pneumatic rotary actuators are constructed with pressure cuffs sandwiched between thin plates. The action of the arms, waist and legs of the nurse are sensed with the muscle hardness sensor utilizing load cell with diaphragm mounted on a sensing tip. The dent of the sensing tip corresponds to the hardness of the muscle so that exerting muscle force produces electric signal. This paper gives the design and characteristics of the power assisting suit using the cuff type pneumatic rotary actuators and the muscle hardness sensor verifying its practicability.

Yamamoto, Keijiro; Hyodo, Kazuhito; Ishii, Mineo; Matsuo, Takashi

196

Development of Validation Testing Technology for the Custom Power Device in Korea  

Microsoft Academic Search

As the concern for power quality grows, many electric utilities across the world are considering approaches to offering pure power to their customers who have electric equipment and processes that are sensitive to power fluctuations by CPD (custom power device). To improve operating technology for the custom power device, we developed validation testing technology considering power system's characters of Korea.

Y. S. Jeon; S. H. Park; N. H. Kwak

2005-01-01

197

DEVELOPMENT OF INFORMATION EMBEDDED POWER SYSTEM USING OPNET  

Microsoft Academic Search

Due to the significant changes, information embedded power system is required to efficiently transmit power system data so as to control and monitor entire power sysetm effectively. Power system protocol plays significant role in realiably transmitting critical data from different power intelligent electronic devices (IEDs) to the main control centre. An experimental analysis was performed to analyse different power system

M. T. O. Amanullah; A. Kalam; A. Zayegh

198

New opportunity of developing nuclear power under the low carbonized economy  

Microsoft Academic Search

Facing the low carbonized economy's development model, the electric power profession became a row of new force of reducing, this article has analyzed the low carbonized characteristic of the nuclear power, the international nuclear power development situation and the present situation of our country's nuclear power, proposed that the nuclear power will become the focal point which the 21st century

Zou Yiqin

2010-01-01

199

Power Systems Development Facility Gasification Test Campaign TC16  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR (formerly Kellogg Brown & Root) Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report discusses Test Campaign TC16 of the PSDF gasification process. TC16 began on July 14, 2004, lasting until August 24, 2004, for a total of 835 hours of gasification operation. The test campaign consisted of operation using Powder River Basin (PRB) subbituminous coal and high sodium lignite from the North Dakota Freedom mine. The highest gasifier operating temperature mostly varied from 1,760 to 1,850 F with PRB and 1,500 to 1,600 F with lignite. Typically, during PRB operations, the gasifier exit pressure was maintained between 215 and 225 psig using air as the gasification oxidant and between 145 and 190 psig while using oxygen as the oxidant. With lignite, the gasifier operated only in air-blown mode, and the gasifier outlet pressure ranged from 150 to 160 psig.

Southern Company Services

2004-08-24

200

Power Systems Development Facility Gasification Test Campaign TC21  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coal. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a Transport Gasifier, a hot gas particulate control device (PCD), advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of the first demonstration of gasification operation with lignite coal following the 2006 gasifier configuration modifications. This demonstration took place during test campaign TC21, occurring from November 7, 2006, through January 26, 2007. The test campaign began with low sodium lignite fuel, and after 304 hours of operation, the fuel was changed to high sodium lignite, for 34 additional hours of operation. Both fuels were from the North Dakota Freedom mine. Stable operation with low sodium lignite was maintained for extended periods, although operation with high sodium lignite was problematic due to agglomeration formation in the gasifier restricting solids circulation.

Southern Company Services

2007-01-30

201

Power Systems Development Facility Gasification Test Campaign TC17  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR (formerly Kellogg Brown & Root) Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results gasification operation with Illinois Basin bituminous coal in PSDF test campaign TC17. The test campaign was completed from October 25, 2004, to November 18, 2004. System startup and initial operation was accomplished with Powder River Basin (PRB) subbituminous coal, and then the system was transitioned to Illinois Basin coal operation. The major objective for this test was to evaluate the PSDF gasification process operational stability and performance using the Illinois Basin coal. The Transport Gasifier train was operated for 92 hours using PRB coal and for 221 hours using Illinois Basin coal.

Southern Company Services

2004-11-30

202

High Power Piezoelectric Characterization for Piezoelectric Transformer Development  

NASA Astrophysics Data System (ADS)

The major goal was to develop characterization techniques to identify and define guidelines to manufacture high power density actuators. We particularly aim at improving the strengths of piezoelectric transformers, namely the high efficiency, ease of manufacturing, low electromagnetic noise, and high power to weight ratio resulting in an adaptor application by identifying material limitations, geometrical limitations and offer guidelines to counter drawbacks limiting the power density. There are 3 losses present in piezoelectrics. Namely dielectric, elastic and piezoelectric losses. These losses can be calculated using mechanical quality factors of the resonating piezoelectric actuator. But in order to calculate all three losses, the mechanical quality factor for resonance and anti resonance need to be measured. Although the mechanical quality factor for resonance is conventionally measured, measurements in antiresonance have been ignored. Since there was no unique measurement technique to address antiresonance and resonance Q in one single sweep, in this study constant vibration velocity method was developed. During the constant vibration velocity measurement, the input electrical energy is monitored and significant differences between resonance and antiresonance drives are observed. For the same output work (identical vibration velocity) significant differences in the losses were observed. Thermographic images have shown increasing temperature differences for resonance and antiresonance nodal point temperatures, with higher vibration velocities. The theoretical evaluation identified the difference observed in the mechanical quality factors at resonance and antiresonance to stem from the piezoelectric loss. In order to investigate losses in the absence of thermal effects a transient characterization technique was adopted. The burst technique, originally developed for characterization of the mechanical quality factor at resonance, has been modified with a switch circuit to leave the resonator in an open circuit condition. The newly introduced open circuits burst have resulted in antiresonance quality factor measurements along with resonance quality factors in a "non-heating" sample. In this technique too, resonance and antiresonance losses showed significant difference. Resonance burst mode characterizations at elevated ambient temperatures have shown that the lower vibration velocity mechanical quality factors appear to be more sensitive to the ambient temperature. Design criteria's to produce the most power dense structure were investigated. Common device shapes were investigated to see which one does enhance the power density of the piezoelectric device. Disk shaped piezoelectric actuators have proven to have lower matching impedances and higher, farther persisting mechanical quality factors with respect to vibration velocities. In order to achieve identical power level, plate shaped samples will have been to strain ~3.5 times more than disk shaped samples. Thus the most power dense structure has been concluded to be a disk shape ~1W/cm3 Once the actuators shape was fixed, further design on structure were conducted with (c)ATILA finite element method. For the transformer application, the design considered following key factors; 1-Controlling the output impedance by optimizing number of layers and layer thicknesses of the multilayer and 2- Evaluation of various electrodes and their affect on high power performance was evaluated. As the thickness of active layers decreased, the number of electrode layers increases. This increase in the metal to piezoelectric ratio and the relative increase in the electrode resistance under high current loads, both will have to be accounted for. Thus; with the piezoelectric composition and the device structure optimized, the research input electrical power. Once the actuators shape was fixed, further design on structure were conducted with (c)ATILA finite element method. For the transformer application, the design considered following key factors; 1-Controlling the output imped

Ural, Seyit O.

203

Organic Rankine power conversion subsystem development for the small community solar thermal power system  

NASA Technical Reports Server (NTRS)

The development and preliminary test results for an air-cooled, hermetically sealed 20 kW sub E organic Rankine cycle engine/alternator unit for use with point focussing distributed receiver solar thermal power system. A 750 F toluene is the working fluid and the system features a high speed, single-stage axial flow turbine direct-coupled to a permanent magnet alternator. Good performance was achieved with the unit in preliminary tests.

Barber, R. E.; Boda, F. P.

1982-01-01

204

Organic Rankine power conversion subsystem development for the small community solar thermal power system  

SciTech Connect

The development and preliminary test results for an air-cooled, hermetically sealed 20 kW sub E organic Rankine cycle engine/alternator unit for use with point focussing distributed receiver solar thermal power system. A 750 F toluene is the working fluid and the system features a high speed, single-stage axial flow turbine direct-coupled to a permanent magnet alternator. Good performance was achieved with the unit in preliminary tests.

Barber, R.E.; Boda, F.P.

1982-07-01

205

Technology status and project development risks of advanced coal power generation technologies in APEC developing economies  

SciTech Connect

The report reviews the current status of IGCC and supercritical/ultrasupercritical pulverized-coal power plants and summarizes risks associated with project development, construction and operation. The report includes an economic analysis using three case studies of Chinese projects; a supercritical PC, an ultrasupercritical PC, and an IGCC plant. The analysis discusses barriers to clean coal technologies and ways to encourage their adoption for new power plants. 25 figs., 25 tabs.

Lusica, N.; Xie, T.; Lu, T.

2008-10-15

206

Access to Power: Governance and Development in the Pakistani Electrical Power Sector  

NASA Astrophysics Data System (ADS)

This dissertation explores governance in Pakistan through a study of the state-run electrical power sector. At both the micro and macro level, the Pakistani power sector provides a lens into the heart of the Pakistani state and its governance institutions. This ethnographic and historical study offers an in-depth look at state operations in a developing country, situates the current Pakistani power crisis in a larger context of continuity through periods of dictatorship and democracy, and suggests how efforts to make state service delivery more responsive to citizens might be reconceived. A historical review of the Pakistani power sector establishes first and foremost that the current crisis is the product of longer-term processes for which the policy solutions currently being proposed (with the support of international donors and multilateral lenders) are inadequate. Depoliticized attempts at power sector reform have little to offer in light of the pervasively informal and negotiated nature of the fragmented Pakistani state. The institutions of power sector governance are mutually constituted by the formal rules and the informal---personal relationships, language, violence, money, and power. These rules of the game are as relevant to relations within and between public sector organizations as they are to the engagement of citizens with their state. The same rules apply at the margins of the state---informal squatter settlements---as at the core, though the resources brought to bear and the resultant outcomes are different. The internal incoherence of this state underscores the limitations of formal rules in determining outcomes, and the poor prospects for reform efforts that focus exclusively on the formal aspects of governance. To proactively engage with the question of political will leads away from top-down policy perspectives and counter to the depoliticizing tendencies that currently shape policy reforms. Instead, an energized and informed local participation can be a counterweight to the inertial tendencies of a Pakistani state whose reforms tend to be co-opted by existing power centers rather than result in changed outcomes.

Naqvi, Ijlal

207

Continuing Development for Free-Piston Stirling Space Power Systems  

NASA Astrophysics Data System (ADS)

Long-life radioisotope power generators based on free-piston Stirling engines are an energy-conversion solution for future space applications. The high efficiency of Stirling machines makes them more attractive than the thermoelectric generators currently used in space. Stirling Technology Company (STC) has been developing free-piston Stirling machines for over 30 years, and its family of Stirling generators is ideally suited for reliable, maintenance-free operation. This paper describes recent progress and status of the STC RemoteGen™ 55 W-class Stirling generator (RG-55), presents an overview of recent testing, and discusses how the technology demonstration design has evolved toward space-qualified hardware.

Peterson, Allen A.; Qiu, Songgang; Redinger, Darin L.; Augenblick, John E.; Petersen, Stephen L.

2004-02-01

208

High power space TWTA development activities for new broadcasting satellites  

NASA Astrophysics Data System (ADS)

Development activities regarding 22-GHz and 12-GHz high-power TWTs and EPCs for future broadcasting satellites are discussed. Design advances in the electron gun and electron beam focusing section, the slow wave circuit, and the collector of the 22-GHz 200-W TWT are reviewed, and some test results are briefly presented. Tube design advances and test results for the 12-GHz 400-W TWT are summarized, showing typical performances. A block diagram of the EPC is shown and discussed, and EPC test results for the 22-GHz 200-W TWT are summarized.

Morishita, Yoji; Hoshino, Hitoshi; Nakagawa, Hitoshi; Makino, Toshimoto; Hamada, Sadanori

1989-10-01

209

Organizing for nuclear power facility development. Final draft report  

SciTech Connect

Centralized power development concepts have been of interest for some years and have been given considerable study in the past, e.g., the Congressionally-directed 1975 NRC studies. In general, while all such studies have concluded that such Centers did offer potential benefits and were feasible, in the mid-1970's, when most of these studies were done, the advantages did not appear to make use of Energy Centers on balance, preferable to continued conventional or dispersed siting. The DOE recognized that more recent circumstances, particularly the TMI accident, and the new imperatives which have been defined since that event for the proper conduct of the nuclear power ''enterprise'' may well have changed that balance. Centralized siting may today offer important benefits, but clearly those benefits can only be realized if the Center is effectively organized and if the institutional problems of organization (i.e., financial, political and jurisdictional) can be dealt with. Thus the Department of Energy asked the S.M. Stoller Corporation (SMSC) to outline the institutional factors and the organizational considerations to be taken into account in the establishment of nuclear power energy centers in the United States.

Not Available

1980-10-01

210

Development of an HTS hydroelectric power generator for the hirschaid power station  

NASA Astrophysics Data System (ADS)

This paper describes the development and manufacture of a 1.7MW, 5.25kV, 28pole, 214rpm hydroelectric power generator consisting of superconducting HTS field coils and a conventional stator. The generator is to be installed at a hydro power station in Hirschaid, Germany and is intended to be a technology demonstrator for the practical application of superconducting technology for sustainable and renewable power generation. The generator is intended to replace and uprate an existing conventional generator and will be connected directly to the German grid. The HTS field winding uses Bi-2223 tape conductor cooled to about 30K using high pressure helium gas which is transferred from static cryocoolers to the rotor via a bespoke rotating coupling. The coils are insulated with multi-layer insulation and positioned over laminated iron rotor poles which are at room temperature. The rotor is enclosed within a vacuum chamber and the complete assembly rotates at 214rpm. The challenges have been significant but have allowed Converteam to develop key technology building blocks which can be applied to future HTS related projects. The design challenges, electromagnetic, mechanical and thermal tests and results are presented and discussed together with applied solutions.

Fair, Ruben; Lewis, Clive; Eugene, Joseph; Ingles, Martin

2010-06-01

211

Advanced on-site power plant development technology program  

NASA Technical Reports Server (NTRS)

A 30-cell, full area short stack containing advanced cell features was tested for 2900 hours. A stack acid addition approach was selected and will be evaluated on the stack at 5000 hours test time. A brassboard inverter was designed and fabrication was initiated. Evaluation of this brassboard inverter will take place in 1984. A Teflon coated commercial heat exchanger was selected as the preferred approach for the acid condenser. A reformer catalyst with significantly less pressure drop and equivalent performance relative to the 40-K baseline catalyst was selected for the development reformer. The early 40-kW field power plant history was reviewed and adjustments were made to the On-Site Technology Development Program to address critical component issues.

1984-01-01

212

Power Systems Development Facility Gasification Test Campaign TC24  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of TC24, the first test campaign using a bituminous coal as the feedstock in the modified Transport Gasifier configuration. TC24 was conducted from February 16, 2008, through March 19, 2008. The PSDF gasification process operated for about 230 hours in air-blown gasification mode with about 225 tons of Utah bituminous coal feed. Operational challenges in gasifier operation were related to particle agglomeration, a large percentage of oversize coal particles, low overall gasifier solids collection efficiency, and refractory degradation in the gasifier solids collection unit. The carbon conversion and syngas heating values varied widely, with low values obtained during periods of low gasifier operating temperature. Despite the operating difficulties, several periods of steady state operation were achieved, which provided useful data for future testing. TC24 operation afforded the opportunity for testing of various types of technologies, including dry coal feeding with a developmental feeder, the Pressure Decoupled Advanced Coal (PDAC) feeder; evaluating a new hot gas filter element media configuration; and enhancing syngas cleanup with water-gas shift catalysts. During TC24, the PSDF site was also made available for testing of the National Energy Technology Laboratory's fuel cell module and Media Process Technology's hydrogen selective membrane.

Southern Company Services

2008-03-30

213

Power Systems Development Facility Gasification Test Campaign TC25  

SciTech Connect

In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of TC25, the second test campaign using a high moisture lignite coal from the Red Hills mine in Mississippi as the feedstock in the modified Transport Gasifier configuration. TC25 was conducted from July 4, 2008, through August 12, 2008. During TC25, the PSDF gasification process operated for 742 hours in air-blown gasification mode. Operation with the Mississippi lignite was significantly improved in TC25 compared to the previous test (TC22) with this fuel due to the addition of a fluid bed coal dryer. The new dryer was installed to dry coals with very high moisture contents for reliable coal feeding. The TC25 test campaign demonstrated steady operation with high carbon conversion and optimized performance of the coal handling and gasifier systems. Operation during TC25 provided the opportunity for further testing of instrumentation enhancements, hot gas filter materials, and advanced syngas cleanup technologies. The PSDF site was also made available for testing of the National Energy Technology Laboratory's fuel cell module and Media Process Technology's hydrogen selective membrane with syngas from the Transport Gasifier.

Southern Company Services

2008-12-01

214

Development Status of the Fission Power System Technology Demonstration Unit  

NASA Technical Reports Server (NTRS)

This paper summarizes the progress that has been made in the development of the Fission Power System Technology Demonstration Unit (TDU). The reactor simulator core and Annular Linear Induction Pump have been fabricated and assembled into a test loop at the NASA Marshall Space Flight Center. A 12 kWe Power Conversion Unit (PCU) is being developed consisting of two 6 kWe free-piston Stirling engines. The two 6 kWe engines have been fabricated by Sunpower Inc. and are currently being tested separately prior to integration into the PCU. The Facility Cooling System (FCS) used to reject convertor waste heat has been assembled and tested at the NASA Glenn Research Center (GRC). The structural elements, including a Buildup Assembly Platform (BAP) and Upper Truss Structure (UTS) have been fabricated, and will be used to test cold-end components in thermal vacuum prior to TDU testing. Once all components have been fully tested at the subsystem level, they will be assembled into an end-to-end system and tested in thermal vacuum at GRC.

Briggs, Maxwell H.; Gibson, Marc A.; Geng, Steven M.; Pearson, Jon Boise; Godfoy, Thomas

2012-01-01

215

Development Status of the Fission Power System Technology Demonstration Unit  

NASA Technical Reports Server (NTRS)

This paper summarizes the progress that has been made in the development of the Fission Power System Technology Demonstration Unit (TDU). The reactor simulator core and Annular Linear Induction Pump have been fabricated and assembled into a test loop at the NASA Marshall Space Flight Center. A 12 kWe Power Conversion Unit (PCU) is being developed consisting of two 6 kWe free-piston Stirling engines. The two 6 kWe engines have been fabricated by Sunpower Inc. and are currently being tested separately prior to integration into the PCU. The Facility Cooling System (FCS) used to reject convertor waste heat has been assembled and tested at the NASA Glenn Research Center (GRC). The structural elements, including a Buildup Assembly Platform (BAP) and Upper Truss Structure (UTS) have been fabricated, and will be used to test cold-end components in thermal vacuum prior to TDU testing. Once all components have been fully tested at the subsystem level, they will be assembled into an end-to-end system and tested in thermal vacuum at NASA GRC.

Briggs, Maxwell H.; Gibson, Marc A.; Geng, Steven M; Pearson, Jon Boise; Godfroy, Thomas

2012-01-01

216

Development of a small scale BIGGT power plant. Technical report  

SciTech Connect

Cratech, Inc. is progressing on a 3-phase plan to develop a one ton per hour (tph) biomass-fueled integrated-gasifier gas turbine (BIGGT) power plant. The goal is to develop economical, small scale (1--20 MWe) power plants for entities worldwide that desire to use a variety of biomass resources for fuel including those with high ash content and prone to slagging. Phase 1 included design, fabrication and operation of a 0.5 tph air-blown pressurized fluidized bed gasification unit complete with a hot gas cleanup system. The unit was fueled with cotton gin trash (CGT), a biomass resource that is high in ash and very prone to slagging. The system demonstrated production of a gas from CGT that can be maintained at a minimum chemical heating value of 130 Btu/SCF, at an outlet temperature of 1265 {+-} 15 F with a maximum particle content of 6.4 ppmw of 2.8 microns maximum particle size.

Craig, J.D.

1994-10-02

217

ENGINEERING DEVELOPMENT OF COAL-FIRED HIGH PERFORMANCE POWER SYSTEMS  

SciTech Connect

A High Performance Power System (HIPPS) is being developed. This system is a coal-fired, combined cycle plant with indirect heating of gas turbine air. Foster Wheeler Development Corporation and a team consisting of Foster Wheeler Energy Corporation, Bechtel Corporation, University of Tennessee Space Institute and Westinghouse Electric Corporation are developing this system. In Phase 1 of the project, a conceptual design of a commercial plant was developed. Technical and economic analyses indicated that the plant would meet the goals of the project which include a 47 percent efficiency (HHV) and a 10 percent lower cost of electricity than an equivalent size PC plant. The concept uses a pyrolyzation process to convert coal into fuel gas and char. The char is fired in a High Temperature Advanced Furnace (HITAF). The HITAF is a pulverized fuel-fired boiler/air heater where steam is generated and gas turbine air is indirectly heated. The fuel gas generated in the pyrolyzer is then used to heat the gas turbine air further before it enters the gas turbine. The project is currently in Phase 2 which includes engineering analysis, laboratory testing and pilot plant testing. Research and development is being done on the HIPPS systems that are not commercial or being developed on other projects. Pilot plant testing of the pyrolyzer subsystem and the char combustion subsystem are being done separately, and after each experimental program has been completed, a larger scale pyrolyzer will be tested at the Power Systems Development Facility (PSDF) in Wilsonville, Al. The facility is equipped with a gas turbine and a topping combustor, and as such, will provide an opportunity to evaluate integrated pyrolyzer and turbine operation. This report addresses the areas of technical progress for this quarter. Preliminary process design was started with respect to the integrated test program at the PSDF. All of the construction tasks at Foster Wheeler's Combustion and Environmental Test Facility (CETF) have been completed in preparation for the char combustion test program, this includes installation of the char burner, and the on-line mass spectrometer. A test matrix has been defined, utilizing a statistical design of experiment (SDOE) methodology, for the char combustion program. The first phase of the CETF shakedown has been completed, and all analog devices (thermocouples, transmitters, etc.) have been calibrated.

NONE

1998-10-01

218

Prospectives for China's solar thermal power technology development  

Microsoft Academic Search

China's total installed electrical power capacity reached 700GW by the end of 2007 and is predicted to surpass 900GW in 2010. The rapid increase in energy demand and increasing global warming have both pushed China to change its current electrical power structure where coal power accounts for nearly 75% of the total electric power generation. China has already become the

Zhifeng Wang

2010-01-01

219

Research on application of non-grid-connected wind power in less developed areas  

Microsoft Academic Search

Distributed generation has become a new research focus in power system worldwide. Non-grid-connected wind power, as a special kind of distributed generation, develops along environmental sustainable development and technological advancement. Non-grid-connected wind power system will provide a road to diversification of wind power utilization. This article analyzes how the wind power is utilized in less developed areas, and combines the

Liya Zhou; Fang Min

2009-01-01

220

Integrated and modular digital modeling approach for the space station electrical power system development  

Microsoft Academic Search

An electrical power system for the Space Station was designed, developed and built. This system provides for electrical power generation, conditioning, storage, and distribution. The initial configuration uses photovoltaic power generation. The power system control is based on a hierarchical architecture to support the requirements of automation. In the preliminary design and technology development phase of the program, various modeling

F. J. Gombos; N. Dravid

1988-01-01

221

Development of a 413 MW railway power supply converter  

Microsoft Academic Search

In Datteln, West Germany, at the site of a new 1100 MW hard coal fired power plant world's largest railway power supply converter station will be built and will convert after completition and commissioning in 2011 up to 413 MW 50 Hz three-phase power into 16.7 Hz two-phase power for Germany's 110 kV traction power system. The converter station exists

H. Wrede; N. Umbricht

2009-01-01

222

Development and testing of high power RF vector modulators  

Microsoft Academic Search

A fan-out RF power distribution system can allow many accelerating cavities to be powered by a single high-power klystron amplifier. High-power vector modulators can perform independent control of amplitudes and phases of RF voltages at the cavities without changing the klystron signal. A prototype high-power RF vector modulator employing a quadrature hybrid and two ferrite phase shifters in coaxial TEM

Yoon W Kang; Joshua L Wilson; Mark Champion; Thomas W Hardek; Sang-Ho Kim; Mike McCarthy; Alexandre V Vassioutchenko

2007-01-01

223

Engineering Development of Coal-Fired High Performance Power Systems  

SciTech Connect

This report presents work carried out under contract DE-AC22-95PC95144 ''Engineering Development of Coal-Fired High Performance Systems Phase II and III.'' The goals of the program are to develop a coal-fired high performance power generation system (HIPPS) that is capable of: thermal efficiency (HHV) {ge} 47% NOx, SOx, and particulates {le} 10% NSPS (New Source Performance Standard) coal providing {ge} 65% of heat input all solid wastes benign cost of electricity {le}{le} 90% of present plants Phase I, which began in 1992, focused on the analysis of various configurations of indirectly fired cycles and on technical assessments of alternative plant subsystems and components, including performance requirements, developmental status, design options, complexity and reliability, and capital and operating costs. Phase I also included preliminary R&D and the preparation of designs for HIPPS commercial plants approximately 300 MWe in size. Phase II, had as its initial objective the development of a complete design base for the construction and operation of a HIPPS prototype plant to be constructed in Phase III. As part of a descoping initiative, the Phase III program has been eliminated and work related to the commercial plant design has been ended. The rescoped program retained a program of engineering research and development focusing on high temperature heat exchangers, e.g. HITAF development (Task 2); a rescoped Task 6 that is pertinent to Vision 21 objectives and focuses on advanced cycle analysis and optimization, integration of gas turbines into complex cycles, and repowering designs; and preparation of the Phase II Technical Report (Task 8). This rescoped program deleted all subsystem testing (Tasks 3, 4, and 5) and the development of a site-specific engineering design and test plan for the HIPPS prototype plant (Task 7). Work reported herein is from: Task 2.2 HITAF Air Heaters

None

2000-12-31

224

Power Systems Development Facility Gasification Test Run TC09  

SciTech Connect

This report discusses Test Campaign TC09 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). The Transport Gasifier was operated as a pressurized gasifier during TC09 in air- and oxygen-blown modes. Test Run TC09 was started on September 3, 2002, and completed on September 26, 2002. Both gasifier and PCD operations were stable during the test run, with a stable baseline pressure drop. The oxygen feed supply system worked well and the transition from air to oxygen was smooth. The gasifier temperature varied between 1,725 and 1,825 F at pressures from 125 to 270 psig. The gasifier operates at lower pressure during oxygen-blown mode due to the supply pressure of the oxygen system. In TC09, 414 hours of solid circulation and over 300 hours of coal feed were attained with almost 80 hours of pure oxygen feed.

Southern Company Services

2002-09-30

225

Power Systems Development Facility Gasification Test Run TC11  

SciTech Connect

This report discusses Test Campaign TC11 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). Test run TC11 began on April 7, 2003, with startup of the main air compressor and the lighting of the gasifier start-up burner. The Transport Gasifier operated until April 18, 2003, when a gasifier upset forced the termination of the test run. Over the course of the entire test run, gasifier temperatures varied between 1,650 and 1,800 F at pressures from 160 to 200 psig during air-blown operations and around 135 psig during enriched-air operations. Due to a restriction in the oxygen-fed lower mixing zone (LMZ), the majority of the test run featured air-blown operations.

Southern Company Services

2003-04-30

226

Development of radiometers for high power thermal radiation  

NASA Astrophysics Data System (ADS)

The development of instrumentation to measure high heat-flux levels (greater than or equal to 1.0 MW/sq m) is described. The progress has followed the provision of arc-image thermal irradiation facilities of power inputs between 2.30 kW. Fast response radiometers have been constructed and - after calibration against an absolute calorimetric measurement - used to indicate incident radiant intensity. Constantan-foil disc radiometers can confer a high degree of spatial as well as temporal resolution with a high degree of precision. Delicate disc-centre thermocouple joints were necessary as well as robust peripheral welding to a cold solderless junction. About ten different coating blacks have been assessed for burn-off tendency over the linear region of response, up to thermal intensities of 5.9 MW/sq m.

Balderston, J.; King, P. W.

1980-01-01

227

Preliminary design development of 100 KW rotary power transfer device  

NASA Technical Reports Server (NTRS)

Contactless power transfer devices for transferring electrical power across a rotating spacecraft interface were studied. A power level of 100 KW was of primary interest and the study was limited to alternating current devices. Rotary transformers and rotary capacitors together with the required dc to ac power conditioning electronics were examined. Microwave devices were addressed. The rotary transformer with resonant circuit power conditioning was selected as the most feasible approach. The rotary capacitor would be larger while microwave devices would be less efficient. A design analysis was made of a 100 KW, 20 kHz power transfer device consisting of a rotary transformer, power conditioning electronics, drive mechanism and heat rejection system. The size, weight and efficiency of the device were determined. The characteristics of a baseline slip ring were presented. Aspects of testing the 100 KW power transfer device were examined. The power transfer device is a feasible concept which can be implemented using presently available technologies.

Weinberger, S. M.

1981-01-01

228

Power Electronics Being Developed for Deep Space Cryogenic Applications  

NASA Technical Reports Server (NTRS)

Electronic circuits and systems designed for deep space missions need to operate reliably and efficiently in harsh environments that include very low temperatures. Spacecraft that operate in such cold environments carry a large number of heaters so that the ambient temperature for the onboard electronics remains near 20 C. Electronics that can operate at cryogenic temperatures will simplify system design and reduce system size and weight by eliminating the heaters and their associated structures. As a result, system development and launch cost will be reduced. At the NASA Glenn Research Center, an ongoing program is focusing on the development of power electronics geared for deep space low-temperature environments. The research and development efforts include electrical components design, circuit design and construction, and system integration and demonstration at cryogenic temperatures. Investigations are being carried out on circuits and systems that are targeted for use in NASA missions where low temperatures will be encountered: devices such as ceramic and tantalum capacitors, metal film resistors, semiconductor switches, magnetics, and integrated circuits including dc/dc converters, operational amplifiers, voltage references, and motor controllers. Test activities cover a wide range of device and circuit performance under simple as well as complex test conditions, such as multistress and thermal cycling. The effect of low-temperature conditions on the switching characteristics of an advanced silicon-on-insulator field effect transistor is shown. For gate voltages (VGS) below 2.6 V, drain currents at -190 C are lower than drain currents at room temperature (20 C).

Patterson, Richard L.; Hammoud, Ahmad

2003-01-01

229

Development of a high permeability cored transintegumental power transformer.  

PubMed

Circulatory support devices require 10-20 W. Currently, several devices are under development for the transmission of this power via transcutaneous transformers, with the secondary implanted subcutaneously and the primary worn externally. Because these devices are air cored, they have relatively large, bulky external appliances, poor coil to coil coupling, and result in significant stray fields passing through adjacent tissues. This article reports on the engineering design of a novel, high permeability cored transformer implanted in a transenteric configuration using an isolated intestinal pouch. Such an approach offers greater energy transmission efficiency, less heat dissipation, less stray electromagnetic energy, and greatly reduced device size. Two competing designs using this concept have been developed and tested. Each consists of the transformer, together with power interface electronics, forming a direct current (DC)/DC resonant converter. Operating frequencies are 90.2 and 14.7 kHz, respectively, with primary/secondary turns ratios of 10/10 and 11/14, respectively. In addition, data interface electronics allows communication across the transformer of up to four signals at a per channel sample rate of 10 Hz. Both designs are able to continuously transmit 25 W at an output level of 12 Vdc into a 5.8 omega load. Calorimetry tests indicate DC to DC efficiencies greater than 75% and coil to coil efficiencies greater than 96%. Total package size for the implantable portion of each device (including sensor internal interface electronics) is less than 40 ml, with a weight weight of less than 100 g. The results of short-term implantation studies have been favorable. Long-term implantation studies currently are under way. PMID:8944956

Helmicki, A J; Melvin, D M; Henderson, H T; Nebrigic, D; Venkat, R; Glos, D L

1996-01-01

230

Development Efforts Expanded in Ion Propulsion: Ion Thrusters Developed With Higher Power Levels  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center was the major contributor of 2-kW-class ion thruster technology to the Deep Space 1 mission, which was successfully completed in early 2002. Recently, NASA s Office of Space Science awarded approximately $21 million to Glenn to develop higher power xenon ion propulsion systems for large flagship missions such as outer planet explorers and sample return missions. The project, referred to as NASA's Evolutionary Xenon Thruster (NEXT), is a logical follow-on to the ion propulsion system demonstrated on Deep Space 1. The propulsion system power level for NEXT is expected to be as high as 25 kW, incorporating multiple ion thrusters, each capable of being throttled over a 1- to 6-kW power range. To date, engineering model thrusters have been developed, and performance and plume diagnostics are now being documented. The project team-Glenn, the Jet Propulsion Laboratory, General Dynamics, Boeing Electron Dynamic Devices, the Applied Physics Laboratory, the University of Michigan, and Colorado State University-is in the process of developing hardware for a ground demonstration of the NEXT propulsion system, which comprises a xenon feed system, controllers, multiple thrusters, and power processors. The development program also will include life assessments by tests and analyses, single-string tests of ion thrusters and power systems, and finally, multistring thruster system tests in calendar year 2005. In addition, NASA's Office of Space Science selected Glenn to lead the development of a 25-kW xenon thruster to enable NASA to conduct future missions to the outer planets of Jupiter and beyond, under the High Power Electric Propulsion (HiPEP) program. The development of a 100-kW-class ion propulsion system and power conversion systems are critical components to enable future nuclear-electric propulsion systems. In fiscal year 2003, a team composed of Glenn, the Boeing Company, General Dynamics, the Applied Physics Laboratory, the Naval Research Laboratory, the University of Wisconsin, the University of Michigan, and Colorado State University will perform a 6-month study that will result in the design of a 25-kW ion thruster, a propellant feed system, and a power processing architecture. The following 2 years will involve hardware development, wear tests, single-string tests of the thruster-power circuits and the xenon feed system, and subsystem service life analyses. The 2-kW-class ion propulsion technology developed for the Deep Space 1 mission will be used for NASA's discovery mission Dawn, which involves maneuvering a spacecraft to survey the asteroids Ceres and Vesta. The 6-kW-class ion thruster subsystem technology under NEXT is scheduled to be flight ready by calendar year 2006. The less mature 25- kW ion thruster system under HiPEP is expected to be ready for a flight advanced development program in calendar year 2006.

Patterson, Michael J.; Rawlin, Vincent K.; Sovey, James S.

2003-01-01

231

Multi-kilowatt modularized spacecraft power processing system development  

NASA Technical Reports Server (NTRS)

A review of existing information pertaining to spacecraft power processing systems and equipment was accomplished with a view towards applicability to the modularization of multi-kilowatt power processors. Power requirements for future spacecraft were determined from the NASA mission model-shuttle systems payload data study which provided the limits for modular power equipment capabilities. Three power processing systems were compared to evaluation criteria to select the system best suited for modularity. The shunt regulated direct energy transfer system was selected by this analysis for a conceptual design effort which produced equipment specifications, schematics, envelope drawings, and power module configurations.

Andrews, R. E.; Hayden, J. H.; Hedges, R. T.; Rehmann, D. W.

1975-01-01

232

Development of a 1 kW polymer electrolyte fuel cell power source  

NASA Astrophysics Data System (ADS)

This paper reports on the development of key components, specifications, configuration and operating characteristics of a hydrogen-fueled portable power source with polymer electrolyte fuel cell (PEFC). A 1 kW class fuel cell module operating on an exclusive method of internal humidification was developed for the power source. A dc-ac inverter, in which a general-purpose integrated power module (IPM) was used as a switching device for microprocessor-based power conversion control, was developed to save the cost of generating dc power output from the cell module. The power source supplies full power within 2 min from start-up, and is capable of generating rated 1 kW power for about 3 h and even longer if the cylinders are replaced. This power source has been confirmed to offer a high power generation efficiency of 30% or higher in overall output range, yielding good-quality power with little noise.

Susai, T.; Kawakami, A.; Hamada, A.; Miyake, Y.; Azegami, Y.

233

Next Generation Integrated Power System: NGIPS Technology Development Roadmap.  

National Technical Information Service (NTIS)

The need for integrated power systems will increase in the coming decades with the increased projected propulsion and ship service power demands for future combatants with advanced sensors and weapons such as railguns and lasers. Integrated propulsion sys...

K. McCoy N. Doerry

2007-01-01

234

Development of an Organic Rankine-Cycle power module for a small community solar thermal power experiment  

NASA Technical Reports Server (NTRS)

An organic Rankine-cycle (ORC) power module was developed for use in a multimodule solar power plant to be built and operated in a small community. Many successful components and subsystems, including the reciever, power conversion subsystem, energy transport subsystem, and control subsystem, were tested. Tests were performed on a complete power module using a test bed concentrator in place of the proposed concentrator. All major single-module program functional objectives were met and the multimodule operation presented no apparent problems. The hermetically sealed, self-contained, ORC power conversion unit subsequently successfully completed a 300-hour endurance run with no evidence of wear or operating problems.

Kiceniuk, T.

1985-01-01

235

Nuclear power for sustainable development: Current status and future prospects  

Microsoft Academic Search

Interest in nuclear power has been revived as a result of volatile fossil fuel prices, concerns about the security of energy supplies, and global climate change. This paper describes the current status and future plans for expansion of nuclear power, the advances in nuclear reactor technology, and their impacts on the associated risks and performance of nuclear power. Advanced nuclear

A. Adamantiades; I. Kessides

2009-01-01

236

Latest development of high-power fiber lasers in SPI  

Microsoft Academic Search

High Power Fiber Lasers (HPFLs) and High Power Fiber Amplifiers (HPFAs) promise a number of benefits in terms of their high optical efficiency, degree of integration, beam quality, reliability, spatial compactness and thermal management. These benefits are driving the rapid adoption of HPFLs in an increasingly wide range of applications and power levels ranging from a few Watts, in for

Stephen Norman; Mikhail N. Zervas; Andrew Appleyard; Michael K. Durkin; Ray Horley; Malcolm P. Varnham; Johan Nilsson; Yoonchan Jeong

2004-01-01

237

Power Systems Development Facility Gasification Test Run TC08  

SciTech Connect

This report discusses Test Campaign TC08 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode using a particulate control device (PCD). The Transport Gasifier was operated as a pressurized gasifier in air- and oxygen-blown modes during TC08. Test Run TC08 was started on June 9, 2002 and completed on June 29. Both gasifier and PCD operations were stable during the test run with a stable baseline pressure drop. The oxygen feed supply system worked well and the transition from air to oxygen blown was smooth. The gasifier temperature was varied between 1,710 and 1,770 F at pressures from 125 to 240 psig. The gasifier operates at lower pressure during oxygen-blown mode due to the supply pressure of the oxygen system. In TC08, 476 hours of solid circulation and 364 hours of coal feed were attained with 153 hours of pure oxygen feed. The gasifier and PCD operations were stable in both enriched air and 100 percent oxygen blown modes. The oxygen concentration was slowly increased during the first transition to full oxygen-blown operations. Subsequent transitions from air to oxygen blown could be completed in less than 15 minutes. Oxygen-blown operations produced the highest synthesis gas heating value to date, with a projected synthesis gas heating value averaging 175 Btu/scf. Carbon conversions averaged 93 percent, slightly lower than carbon conversions achieved during air-blown gasification.

Southern Company Services

2002-06-30

238

Power Systems Development Facility Gasification Test Run TC07  

SciTech Connect

This report discusses Test Campaign TC07 of the Kellogg Brown & Root, Inc. (KBR) Transport Reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using a particulate control device (PCD). The Transport Reactor was operated as a pressurized gasifier during TC07. Prior to TC07, the Transport Reactor was modified to allow operations as an oxygen-blown gasifier. Test Run TC07 was started on December 11, 2001, and the sand circulation tests (TC07A) were completed on December 14, 2001. The coal-feed tests (TC07B-D) were started on January 17, 2002 and completed on April 5, 2002. Due to operational difficulties with the reactor, the unit was taken offline several times. The reactor temperature was varied between 1,700 and 1,780 F at pressures from 200 to 240 psig. In TC07, 679 hours of solid circulation and 442 hours of coal feed, 398 hours with PRB coal and 44 hours with coal from the Calumet mine, and 33 hours of coke breeze feed were attained. Reactor operations were problematic due to instrumentation problems in the LMZ resulting in much higher than desired operating temperatures in the reactor. Both reactor and PCD operations were stable and the modifications to the lower part of the gasifier performed well while testing the gasifier with PRB coal feed.

Southern Company Services

2002-04-05

239

Power Systems Development Facility. Quarterly report, July--September 1995  

SciTech Connect

The objective of this project is to evaluate hot gas particle control technologies using coal-derived gas streams. This will entail the design, construction, installation, and use of a flexible test facility which can operate under realistic gasification and combustion conditions. The major particulate control device issues to be addressed include the integration of the particulate control devices into coal utilization systems, on-line cleaning techniques, chemical and thermal degradation of components, fatigue or structural failures, blinding, collection efficiency as a fimction of particle size, and scale-up of particulate control systems to commercial size. The conceptual design of the facility was extended to include a within scope, phased expansion of the existing Hot Gas Cleanup Test Facility Cooperative Agreement to also address systems integration issues of hot particulate removal in advanced coal-based power generation systems. This expansion included the consideration of the following modules at the test facility in addition to the original Transport Reactor gas source and hot gas cleanup units: carbonizer/pressurized circulating fluidized bed gas source; hot gas cleanup units to mate to all gas streams; combustion gas turbine; and fuel cell and associated gas treatment. This expansion to the Hot Gas Cleanup Test Facility is herein referred to as the Power Systems Development Facility (PSDF). The major emphasis during this reporting period was continuing the detailed design of the facility towards completion and integrating the balance-of-plant processes and particulate control devices (PCDS) into the structural and process designs. Substantial progress in construction activities was achieved during the quarter. Delivery and construction of the process structural steel is nearing completion. Nearly all equipment are set in its place and the FW equipment and the PCDs are being set in the structure.

NONE

1995-11-01

240

DEVELOPMENT AND TESTING OF HIGH POWER RF VECTOR MODULATORS*  

SciTech Connect

A fan-out RF power distribution system can allow many accelerating cavities to be powered by a single high-power klystron amplifier. High-power vector modulators can perform independent control of amplitudes and phases of RF voltages at the cavities without changing the klystron signal. A prototype highpower RF vector modulator employing a quadrature hybrid and two ferrite phase shifters in coaxial TEM transmission lines has been built and tested for 402.5 MHz. RF properties of the design and results of high power testing are presented.

Kang, Yoon W [ORNL; Wilson, Joshua L [ORNL; Champion, Mark [FNAL; Hardek, Thomas W [ORNL; Kim, Sang-Ho [ORNL; McCarthy, Mike [ORNL; Vassioutchenko, Alexandre V [ORNL

2007-01-01

241

Power Hardware-in-the-loop Simulation of a Gas Engine Cogeneration System for Developing a Power Converter System  

Microsoft Academic Search

This research focuses on the development scheme of a power converter in a gas engine cogeneration system using a power hardware-in-the-loop simulation. A matrix converter is adopted to substitute a conventional ac\\/dc\\/ac converter and transfers three phase electricity to single phase electricity directly. To inevstigate the interaction between gas engine-generator unit and the proposed matrix converter, a power hardware-in-the-loop simulation

Miao Hong; Satoshi Horie; Yushi Miura; Tosifumi Ise; Yuki Sato; Toshinari Momose; Christian Dufour

2010-01-01

242

Development of d.c. power supply for gyrotron with energy recovery system  

Microsoft Academic Search

A new type of power supply system for a gyrotron with collector potential depression (CPD) to enhance gyrotron efficiency was developed. The power supply system is composed of a main power supply (MPS) and an acceleration power supply (APS). The APS which provides the stable high field to the magnetron injection gun (MIG) of the gyrotron is the key point

M. Tsuneoka; H. Fujita; K. Sakamoto; A. Kasugai; T. Imai; T. Nagashima; T. Asaka; N. Kamioka; M. Yasuda; T. Iiyama; T. Yoshida; H. Nara; M. Ishibashi

1997-01-01

243

High power gas laser - Applications and future developments  

NASA Technical Reports Server (NTRS)

Fast flow can be used to create the population inversion required for lasing action, or can be used to improve laser operation, for example by the removal of waste heat. It is pointed out that at the present time all lasers which are capable of continuous high-average power employ flow as an indispensable aspect of operation. High power laser systems are discussed, taking into account the gasdynamic laser, the HF supersonic diffusion laser, and electric discharge lasers. Aerodynamics and high power lasers are considered, giving attention to flow effects in high-power gas lasers, aerodynamic windows and beam manipulation, and the Venus machine. Applications of high-power laser technology reported are related to laser material working, the employment of the laser in controlled fusion machines, laser isotope separation and photochemistry, and laser power transmission.

Hertzberg, A.

1977-01-01

244

Study on Control State and Development of Power Quality for Railway Traction Power Supply System  

Microsoft Academic Search

In this paper, some major factors to affect power quality for electrified railway were introduced. And the approaches of control power quality for electrified railway were studied detailedly. The advantages and disadvantages of these measures are generalized respectively. In the view of reliability, economy and technology, integrated control scheme of power quality for electrified railway was put forward as matters

Xiangzheng Xu; Baichao Chen

2009-01-01

245

Nuclear power technologies at the stage of sustainable nuclear power development  

Microsoft Academic Search

It is not simple to solve the problem of competitiveness of nuclear power technologies in evolutionary upgrading the conventional nuclear power plants (NPP) such as light water reactors (LWR), which requires high expenditure for safety. Moreover, the existing LWRs cannot provide nuclear power (NP) for a long time (hundreds of years) because the efficiency of use of natural uranium is

G. I. Toshinsky; O. G. Komlev; K. G. Mel’nikov

2011-01-01

246

DEVELOPMENT OF REALITY ORIENTED SIMULATION MODELS OF POWER PLANTS AND POWER SYSTEMS FOR RESTORATION STUDIES  

Microsoft Academic Search

With the unbundling, deregulation and liberalisation of the European Inte r- connected Network a reduction of the security and stability limits of the electrical power system has to be expected. In this context the availability of reality oriented simulation models of power plants and power systems becomes more and more important. These models are necessary both for pre-fault-scenarios concerning the

H. W. Weber; F. Prillwitz; M. Hladky; H.-P. Asal

2000-01-01

247

National strategies for nuclear power reactor development. Executive summary  

Microsoft Academic Search

The document assesses the potential for design innovation in three areas of nuclear power plant technology: light-water reactor systems; liquid metal reactor systems; and high-temperature-gas reactor systems. The question of how capital costs scale with unit size in nuclear power reactor systems is addressed. Small modular high-temperature-gas reactor designs are reviewed, and an electric-power-system capacity planning model that allows estimates

R. K. Lester; M. J. Driscoll; M. W. Golay; D. D. Lanning; L. M. Lidsky

1985-01-01

248

Development of molten carbonate fuel cell power plant  

NASA Astrophysics Data System (ADS)

User requirements and power plant subsystem alternatives and characteristics were defined. A total of 27 laboratory cells were operated and a total of nine cells continued on test at the end of the quarter. Investigation of alternative anode and cathode materials proceeded; a dual-porosity anode was fabricated and tested. Over 10,000 endurance hours on a state of the art cell carried-over from a previous program was achieved and 1500 hours endurance was obtained with sheet metal cells. Results presented for electrolyte structure development include comparative data for spray-dried and modified aqueous slurry process powders. Shakedown tests with a rotating disc electrode apparatus for fundamental measurements are described. Concept designs for both prototype and subscale stacks were identified. An overall test plan to commercialization for molten carbonate fuels cells and a functional specification for the tenth-scale stack test facility were proposed. Cost-effective manufacturing assessment of available designs and processes was initiated. Available contaminants concentration and effects information was gathered and initial projections of contaminant ranges and concentrations were prepared.

Peterson, J. R.

1980-07-01

249

Development of an Organic Rankine-Cycle Power Module for a Small Community Solar Thermal Power Experiment.  

National Technical Information Service (NTIS)

An organic Rankine-cycle (ORC) power module was designed and developed for use in a multi-module solar power plant to be built and operated in a small community. Although neither final design nor construction of the multi-module plant took place, many suc...

T. Kiceniuk

1985-01-01

250

Power Systems Development Facility Gasification Test Run TC10  

SciTech Connect

This report discusses Test Campaign TC10 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). The Transport Gasifier was operated as a pressurized gasifier during TC10 in air- (mainly for transitions and problematic operations) and oxygen-blown mode. Test Run TC10 was started on November 16, 2002, and completed on December 18, 2002. During oxygen-blown operations, gasifier temperatures varied between 1,675 and 1,825 F at pressures from 150 to 180 psig. After initial adjustments were made to reduce the feed rate, operations with the new fluidized coal feeder were stable with about half of the total coalfeed rate through the new feeder. However, the new fluidized-bed coal feeder proved to be difficult to control at low feed rates. Later the coal mills and original coal feeder experienced difficulties due to a high moisture content in the coal from heavy rains. Additional operational difficulties were experienced when several of the pressure sensing taps in the gasifier plugged. As the run progressed, modifications to the mills (to address processing the wet coal) resulted in a much larger feed size. This eventually resulted in the accumulation of large particles in the circulating solids causing operational instabilities in the standpipe and loop seal. Despite problems with the coal mills, coal feeder, pressure tap nozzles and the standpipe, the gasifier did experience short periods of stability during oxygenblown operations. During these periods, the syngas quality was high. During TC10, the gasifier gasified over 609 tons of Powder River Basin subbituminous coal and accumulated a total of 416 hours of coal feed, over 293 hours of which were in oxygen-blown operation. No sorbent was used during the run.

Southern Company Services

2002-12-30

251

Design and Development of Thermistor based Power Meter at 140 GHz Frequency Band  

NASA Astrophysics Data System (ADS)

Design and development of thermistor based power meter at 140 gigahertz (GHz) frequency band have been presented. Power meter comprises power sensor, amplifier circuit and dialog based graphical user interface in visual C++ for the average power measurement. The output power level of a component or system is very critical design factor. Thus there was a need of a power meter for the development of millimeter wave components at 140 GHz frequency band. Power sensor has been designed and developed using NTC (Negative Temperature Coefficient) thermistors. The design aims at developing a direct, simple and inexpensive power meter that can be used to measure absolute power at 140 GHz frequency band. Due to absorption of 140 GHz frequencies, resistance of thermistor changes to a new value. This change in resistance of thermistor can be converted to a dc voltage change and amplified voltage change can be fed to computer through data acquisition card. Dialog based graphical user interface (GUI) has been developed in visual C++ language for average power measurement in dBm. WR6 standard rectangular waveguide is the input port for the sensor of power meter. Temperature compensation has been achieved. Moderate sensor return loss greater than 20 dB has been found over the frequency range 110 to 170 GHz. The response time of the power sensor is 10 second. Average power accuracy is better than ±0.25 dB within the power range from -10 to 10 dBm at 140 GHz frequency band.

Roy, Rajesh; Kush, Abhimanyue Kumar; Dixit, Rajendra Prasad

2011-12-01

252

Bi-Directional Four Quadrant (BDQ4) Power Converter Development.  

National Technical Information Service (NTIS)

The feasibility for implementation of a concept for direct ac/dc multikilowatt power conversion with bidirectional transfer of energy was investigated. A 10 kHz current carrier was derived directly from a common 60 Hz three phase power system. This carrie...

F. C. Schwarz

1979-01-01

253

Development of 70kV, 22A DC power supply for High Power RF and microwave tubes  

NASA Astrophysics Data System (ADS)

Our institute (IPR) is involved in the development of High Power RF and Microwave sources for various fusion related heating and current drive applications. All the high power RF and microwave tubes e.g. Klystron, Gyrotron tetrode etc need a high voltage DC power supply to deliver the required high power with necessary protections. To cater to the initial testing and commissioning requirements, the development of 70kV, 22A power supply is initiated. The supply ratings are chosen to meet general tube requirements i.e. Klystron, Gyrotron and Tetrode used in RF group. The supply would be a part of test facility, rather than a regular supply for use in an experiment. Hence some ripple and regulation requirements are relaxed to optimize the cost. However all protections including crowbar protection are accommodated. This supply when ready enables continuous full power testing of TH 2103D Klystrons, GLGD-82.6/0.2 Gyrotron and short time (3Sec-"ON", 120Sec-"OFF") full power testing of 1.5MW Tetrode. This paper presents analysis of requirements of various tubes, power supply rating optimization, topology selection, protection requirements and other facilities required. Remote monitoring through DAC and remote control requirement from various locations, are highlighted. Present status of development is mentioned.

Srinivas, Y. S. S.; Babu, Rajan; Makwana, Azad; Parmar, Kirit; Kulkarni, S. V.; Rf Group

2010-02-01

254

Development and Testing of an Ultracapacitor Based Uninterruptible Power Supply (UPS) System.  

National Technical Information Service (NTIS)

The NASA Glenn Research Center (GRC) initiated the development and testing of an ultracapacitor based uninterruptible power supply (UPS) system as a means to provide backup power for the many critical NASA applications. A UPS system typically utilizes bat...

D. J. Eichenberg

2010-01-01

255

Subsystems design and component development for the parabolic dish module for solar thermal power systems  

NASA Technical Reports Server (NTRS)

Solar thermal power systems parabolic dish activities are summarized. Subsystem designs of concentrators, receivers, engines, power converters, and thermal transport are discussed. Analyses, test results, field tests, small community system development and the parabolic dish test site are also included.

Stein, C. K.

1982-01-01

256

Development of an organic Rankine-cycle power module for a small community solar thermal power experiment  

SciTech Connect

An organic Rankine-cycle (ORC) power module was designed and developed for use in a multi-module solar power plant to be built and operated in a small community. Although neither final design nor construction of the multi-module plant took place, many successful components and subsystems, including the receiver, power conversion subsystem, energy transport subsystem, and control subsystem, were developed and tested before the program was halted. In addition, tests were performed on a complete power module using a test bed concentrator in place of the proposed concentrator at the Jet Propulsion Laboratory's Parabolic Dish Test Site at Edwards Air Force Base, California. Test results with the complete module verified that all major single-module program functional objectives were met and that multi-module operation presented no apparent problems. The hermetically sealed, self-contained, ORC power conversion unit subsequently successfully completed a 300-h endurance run with no evidence of wear or operating problems.

Kiceniuk, T.

1985-01-15

257

Integrated Micro-Power System (IMPS) Development at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

Glenn Research Center (GRC) has a long history of energy related technology developments for large space related power systems, including photovoltaics, thermo-mechanical energy conversion, electrochemical energy storage. mechanical energy storage, power management and distribution and power system design. Recently, many of these technologies have begun to be adapted for small, distributed power system applications or Integrated Micro-Power Systems (IMPS). This paper will describe the IMPS component and system demonstration efforts to date.

Wilt, David; Hepp, Aloysius; Moran, Matt; Jenkins, Phillip; Scheiman, David; Raffaelle, Ryne

2003-01-01

258

Innovation on Energy Power Technology (11)A History on Improvement of Disassembled Transportation Technology and Development of Large Power Transformer  

NASA Astrophysics Data System (ADS)

The restrictions of transportation are one of the major parameters for transformer design and affect the available capacity, various characteristics and even reliability. With the progress of increasing power demand, transformer size and weight have been increasing. However, in Japan the restrictions for size and weight in rail and road are strict, and several kinds of technology for transformer construction and transportation method have been developed to meet these requirements. One technology is the disassembled transportation method for transformer. Fortunately we have experienced three type disassembled transportation methods for Kamishiiba power station for approximately 50 years. This paper introduces a history on improvement of disassembled transportation technology and development of large power transformer.

Amano, Naoki; Watanabe, Masaru

259

Satellite power system. Concept development and evaluation program  

SciTech Connect

The Reference System description emphasizes technical and operational information required in support of environmental, socioeconomic, and comparative assessment studies. Supporting information has been developed according to a guideline of implementing two 5 GW SPS systems per year for 30 years beginning with an initial operational data of 2000 and with SPS's being added at the rate of two per year (10 GW/year) until 2030. The Reference System concept, which features gallium--aluminum--arsenide (GaAlAs) and silicon solar cell options, is described in detail. The concept utilizes a planar solar array (about 55 km/sup 2/) built on a graphite fiber reinforced thermoplastic structure. The silicon array uses a concentration ratio of one (no concentration), whereas the GaAlAs array uses a concentration ratio of two. A one-kilometer diameter phased array microwave antenna is mounted on one end. The antenna uses klystrons as power amplifiers with slotted waveguides as radiating elements. The satellite is constructed in geosynchronous orbit in a six-month period. The ground receiving stations (rectenna) are completed during the same time period. The other two major components of an SPS program are (1) the construction bases in space and launch and mission control bases on earth and (2) fleets of various transportation vehicles that support the construction and maintenance operations of the satellites. These transportation vehicles include Heavy Lift Launch Vehicles (HLLV), Personnel Launch Vehicles (PLV), Cargo Orbit Transfer Vehicles (COTV), and Personnel Orbit Transfer Vehicles (POTV). The earth launch site chosen is the Kennedy Space Center, pending further study.

Not Available

1978-10-01

260

Research issues in developing compact pulsed power for high peak power applications on mobile platforms  

Microsoft Academic Search

Pulsed power is a technology that is suited to drive electrical loads requiring very large power pulses in short bursts (high-peak power). Certain applications require technology that can be deployed in small spaces under stressful environments, e.g., on a ship, vehicle, or aircraft. In 2001, the U.S. Department of Defense (DoD) launched a long-range (five-year) Multidisciplinary University Research Initiative (MURI)

JOHN A. GAUDET; ROBERT J. BARKER; C. JERALD BUCHENAUER; CHRISTOS CHRISTODOULOU; JAMES DICKENS; MARTIN A. GUNDERSEN; RAVINDA P. JOSHI; HERMANN G. KROMPHOLZ; JUERGEN F. KOLB; ANDRÁS KUTHI; MOUNIR LAROUSSI; ANDREAS NEUBER; WILLIAM NUNNALLY; EDL SCHAMILOGLU; KARL H. SCHOENBACH; J. SCOTT TYO; ROBERT J. VIDMAR

2004-01-01

261

Development and analysis for core power gamma thermometer adaptation  

SciTech Connect

The gamma thermometer (GT) has gained increasing interest to replace the local power range monitor (LPRM) and the traversing in-core probe (TIP) as the core monitoring device in new boiling water reactor (BWR) designs. The number of GTs is designed between the number of LPRMs, 4, and the number of TIPs, 24, per string, but its optimal number is yet to be determined. The authors have modified the BWR core Simulator PANACEA for analyzing the core power GT adaptation and have compared the axial core-averaged relative power distributions and two thermal limits of the GT 8- and 12-point adaptations against those of the TIP 24-point adaptation.

Ren-Tai Chiang; Leong, T. [General Electric Co., San Jose, CA (United States)

1996-12-31

262

Response of Rocky Mountain Elk (Cervus elaphus) to Wind-power Development  

Microsoft Academic Search

Wind-power development is occurring throughout North America, but its effects on mammals are largely unexplored. Our objective was to determine response (i.e., home-range, diet quality) of Rocky Mountain elk (Cervus elaphus) to wind-power development in southwestern Oklahoma. Ten elk were radiocollared in an area of wind-power devel- opment on 31 March 2003 and were relocated bi-weekly through March 2005. Wind-power

W. David Walter; David M. Leslie; Jonathan A. Jenks

2006-01-01

263

Photovoltaic power conditioning subsystem: State of the art and development opportunities  

NASA Technical Reports Server (NTRS)

Photovoltaic systems, the state of the art of power conditioning subsystem components, and the design and operational interaction between photovoltaic systems and host utilities are detailed in this document. Major technical issues relating to the design and development of power conditioning systems for photovoltaic application are considered; these include: (1) standards, guidelines, and specifications; (2) cost effective hardware design; (3) impact of advanced components on power conditioning development; (4) protection and safety; (5) quality of power; (6) system efficiency; and (7) system integration with the host utility. Theories of harmonic distortion and reactive power flow are discussed, and information about power conditioner hardware and manufacturers is provided.

Krauthamer, S.; Bahrami, K.; Das, R.; Macie, T.; Rippel, W.

1984-01-01

264

Development and Application of the High Bandwidth Powered Resonance Tube.  

National Technical Information Service (NTIS)

The Powered Resonance Tube (PRT) actuator, which is an adaptation of the Hartmann whistle, was selected for bandwidth enhancement. The operation and near field features of this actuator were characterized both experimentally and computationally. An improv...

A. Cain G. Raman E. Kerschen C. Nelson

2005-01-01

265

Inductor Network Development for Aircraft High Power Supplies.  

National Technical Information Service (NTIS)

This report presents the results of a study program undertaken to perform a comparative analysis of several approaches to the generation of high electrical power by storing tens to hundreds of kilojoules of energy in a compact, superconducting inductive s...

J. Teno R. L. Bryan S. Ghoshroy L. M. Lontai O. K. Sonju

1977-01-01

266

Prospects for the power sector in nine developing countries.  

National Technical Information Service (NTIS)

Based on information drawn primarily from official planning documents issued by national governments and/or utilities, the authors examined the outlook for the power sector in the year 2000 in nine countries: China, India, Indonesia, Thailand, the Philipp...

S. Meyers N. Goldman N. Martin R. Friedmann

1993-01-01

267

Development of automated power system management techniques. [spacecraft design  

NASA Technical Reports Server (NTRS)

The basic approach in the automated power system management (APSM) implementation is to use one central microprocessor for the overall power system supervision and several local microprocessors dedicated to one or more major subassemblies to perform simple monitoring and control functions. Communication between the central and each local processor is through a dedicated two-wire network employing serial data transfer. The block diagrams of the processors, the data bus characteristics, and the software functions and organization are presented.

Imamura, M. S.; Moser, R. L.; Skelly, L. A.; Weiner, H.

1978-01-01

268

Beyond blue pico laser: development of high power blue and low power direct green  

NASA Astrophysics Data System (ADS)

There is a big need on R&D concerning visible lasers for projection applications. The pico-size mobile projection on the one hand awaits the direct green lasers with sufficiently long lifetimes at optical powers above 50mW. In this paper we demonstrate R&D-samples emitting at 519nm with lifetimes up to 10.000 hours. The business projection on the other hand requires high power operation and already uses blue lasers and phosphor conversion, but there is a strong demand for higher power levels. We investigate the power limits of R&D laser structures. In continuous wave operation, the power is limited by thermal roll-over. With an excellent power conversion efficiency of up to 29% the thermal roll-over is as high as 2.5W for a single emitter in TO56 can. We do not observe significant leakage at high currents. Driven in short pulse operation to prevent the laser from self heating, linear laser characteristics of optical power versus electrical current are observed up to almost 8W of optical power.

Vierheilig, Clemens; Eichler, Christoph; Tautz, Sönke; Lell, Alfred; Müller, Jens; Kopp, Fabian; Stojetz, Bernhard; Hager, Thomas; Brüderl, Georg; Avramescu, Adrian; Lermer, Teresa; Ristic, Jelena; Strauss, Uwe

2012-02-01

269

The development of electromechanical batteries for power system support and for sthort-term standby power  

Microsoft Academic Search

The slow move from a fossil-fuel powered society to a renewable-energy powered society is creating and will continue to create a demand for good energy storage techniques. The electromechanical battery (EMB), comprising a flywheel energy storage system with electrical input and output, is one of the many candidate technologies. Two different EMB types are evaluated in this present project. The

Michael Peter OLeary

1997-01-01

270

Development of an expert system for power quality advisement using CLIPS 6.0  

NASA Technical Reports Server (NTRS)

Proliferation of power electronic devices has brought in its wake both deterioration in and demand for quality power supply from the utilities. The power quality problems become apparent when the user's equipment or systems maloperate or fail. Since power quality concerns arise from a wide variety of sources and the problem fixes are better achieved from the expertise of field engineers, development of an expert system for power quality advisement seems to be a very attractive and cost-effective solution for utility applications. An expert system thus developed gives an understanding of the adverse effects of power quality related problems on the system and could help in finding remedial solutions. The paper reports the design of a power quality advisement expert system being developed using CLIPS 6.0. A brief outline of the power quality concerns is first presented. A description of the knowledge base is next given and details of actual implementation include screen output from the program.

Chandrasekaran, A.; Sarma, P. R. R.; Sundaram, Ashok

1994-01-01

271

Advanced pulsed power concept and component development for KrF laser IFE  

Microsoft Academic Search

The Electra advanced pulsed power development program has the goal of developing and demonstrating pulsed power technology that is applicable for KrF (krypton fluoride) laser IFE (inertial fusion energy). The application presents efficiency, lifetime and cost challenges that mandate the use of advanced pulse compression topologies. In turn, these advanced topologies require the development of critical components and the establishment

D. Weidenheimer; I. Smith; F. T. Warren; D. Morton; L. Schlitt; D. Giorgi; J. Driscoll; J. Sethian

2002-01-01

272

Adapting the experience of DOD\\/Industry to developing fusion power reactors  

Microsoft Academic Search

Recent advances in controlled fusion research providing grounds for optimism are pointed out, and the program outlook for fusion power and management approaches to fusion reactor development are discussed. Contributions by the aerospace industry to fusion power development are discussed; comparisons between aerospace engineering design technology and needs of the fusion development program are cited (design to cost; scheduling and

W. C. Gough; W. B. Briggs

1977-01-01

273

Development of Jet Noise Power Spectral Laws Using SHJAR Data  

NASA Technical Reports Server (NTRS)

High quality jet noise spectral data measured at the Aeroacoustic Propulsion Laboratory at the NASA Glenn Research Center is used to examine a number of jet noise scaling laws. Configurations considered in the present study consist of convergent and convergent-divergent axisymmetric nozzles. Following the work of Viswanathan, velocity power factors are estimated using a least squares fit on spectral power density as a function of jet temperature and observer angle. The regression parameters are scrutinized for their uncertainty within the desired confidence margins. As an immediate application of the velocity power laws, spectral density in supersonic jets are decomposed into their respective components attributed to the jet mixing noise and broadband shock associated noise. Subsequent application of the least squares method on the shock power intensity shows that the latter also scales with some power of the shock parameter. A modified shock parameter is defined in order to reduce the dependency of the regression factors on the nozzle design point within the uncertainty margins of the least squares method.

Khavaran, Abbas; Bridges, James

2009-01-01

274

Power  

NASA Technical Reports Server (NTRS)

The space station requires an increase in power or energy of at least several orders of magnitude compared to previous space missions. With the requirement up in the range of 10 kilowatt hours, this obviiously requires the development of new technology. Although the power area is very well integrated in the spacecraft itself, it represents a diverse set of components necessary for energy conversion, electronics, and energy distribution. Considerable work is ongoing at NASA Lewis in the power devices development area, including transformers, large area solid-state chips, transistors, and fast recovery diodes. This work is oriented toward eventual application to both AC and DC power conversion approaches. In the energy storage area, there are many options available to fit into the space station representing various degrees of risk and leverage combination, such as the near-term integral-pressure-vessel nickel hydrogen battery, an advanced Ni-H2 battery concept, and the regenrative hydrogen-oxygen system utilizing essentially the Shuttle orbiter type of fuel cell.

Corbett, R.

1984-01-01

275

Village power hybrid systems development in the United States.  

National Technical Information Service (NTIS)

The energy demand in developing countries is growing at a rate seven times that of the OECD countries, even though there are still 2 billion people living in developing countries without electricity. Many developing countries have social and economic deve...

L. Flowers J. Green M. Bergey A. Lilley L. Mott

1994-01-01

276

Development of valve-regulated lead acid batteries for power storage  

Microsoft Academic Search

The authors developed valve-regulated lead-acid batteries for power storage with long cycle life, designed for accumulating excess power that is cheap during the nighttime and for making peak cuts in daytime power and for leveling the loads. To increase their cycle life, the units were made to conform to a new set of specifications, such as (1) an positive plate

H. Takabayashi; I. Shimoura; Y. Matsuda; K. Onoue

2003-01-01

277

Recent research and development on power systems with a large number of distributed generating facilities  

Microsoft Academic Search

The paper describes the achievements and trend in research and development in Japan related to power system connections of a large number of distributed generation (DG). The major results from some of the R&D projects related to power system connections of PV or wind power generations are presented. In addition, current research activities for new technologies for distributing and managing

T. Ichikawa

2002-01-01

278

Airworthiness criteria development for powered-lift aircraft: A program summary  

NASA Technical Reports Server (NTRS)

A four-year simulation program to develop airworthiness criteria for powered-lift aircraft is summarized. All flight phases affected by use of powered lift (approach, landing, takeoff) are treated with regard to airworthiness problem areas (limiting flight conditions and safety margins: stability, control, and performance; and systems failure). The general features of powered-lift aircraft are compared to conventional aircraft.

Heffley, R. K.; Stapleford, R. L.; Rumold, R. C.

1977-01-01

279

Hydrothermal industrialization electric-power systems development. Final report  

SciTech Connect

The nature of hydrothermal resources, their associated temperatures, geographic locations, and developable capacity are described. The parties involved in development, required activities and phases of development, regulatory and permitting requirements, environmental considerations, and time required to complete development activities ae examined in detail. These activities are put in proper perspective by detailing development costs. A profile of the geothermal industry is presented by detailing the participants and their operating characteristics. The current development status of geothermal energy in the US is detailed. The work on market penetration is summarized briefly. Detailed development information is presented for 56 high temperature sites. (MHR)

Not Available

1982-03-01

280

Development of a highly reliable power electronic unit for helicopters  

Microsoft Academic Search

This paper introduces a concept for a reliable and miniaturized power control unit (PCU). With this PCU, an electro-mechanical actuator (EMA) is controlled. This EMA is intended to be used in a swashplateless helicopter control system. As this is a safety relevant part of the helicopter, the PCU needs to work reliably under challenging ambient and operating conditions. At the

Gudrun Feix; Christoph Marczok; Eckart Hoene; Tomasz Napierala; Daniel Fuerst

2010-01-01

281

Nuclear power in developing countries: an analysis of decision making  

Microsoft Academic Search

This study began in the fall of 1978, unaware of the problems to be encountered as the project unfolded. The editors focused explicitly on nuclear power generation, avoiding Third World nuclear proliferation and weapons potential. Although preferring to include authors with backgrounds in the countries being studied, nonnationals were not excluded when their research or experience included the proper perspectives

J. E. Katz; O. S. Marwah

1982-01-01

282

Ecological problems in the development of nuclear power  

Microsoft Academic Search

Conclusions The initial and middle stages of the nuclear fuel cycle, i.e., mining and reprocessing of ore, uranium enrichment, production of fuel elements, and the normal operation of a nuclear power plant, do not cause any serious danger to the environment. Comparisons show that the negative-effect coal-fired HEP is much greater.

B. Gerzhmansky

1980-01-01

283

Cold DeNOx development for oxyfuel power plants  

Microsoft Academic Search

Flue gas purification is a necessary method to avoid emission of sour gases like SOx and NOx into the environment. Another important aspect is the zero CO2 emission from coal-fired power plants. Oxyfuel technology is one of the processes to reach this goal. LINDE KCA Dresden in cooperation with Vattenfall Europe is operating a pilot plant producing liquefied CO2. Product

Florian Winkler; Nicole Schoedel; Hans-Jörg Zander; Roland Ritter

2011-01-01

284

Development of an Electric Powered Tiller for House Gardening  

Microsoft Academic Search

This report describes the design, manufacturing, analysis, control, and experimental activities in which a student conducted for a motor-powered tiller for house gardening work. In Japan, the engagement in agricultural business was decreased to 50% during the past 20 years, and labor-saving and efficiency has been demanded. Besides, the elderly engagements are about 50 %. In this research, a student

Haruo Sakamoto

2007-01-01

285

Development of the next generation of powerful electron accelerators  

NASA Astrophysics Data System (ADS)

The construction and principal circuit of the powerful accelerators of the next generation is described. These are the accelerator ELV-6M with two extraction windows and accelerator "Tourch" where electron beam is extracted into the atmosphere trough the little hole with the using the differential vacuum pumping.

Kuksanov, N. K.; Korabelnikov, B. M.; Kosilov, M. R.; Nemytov, P. I.; Prudnikov, V. R.; Salimov, R. A.; Veis, M. E.

1995-02-01

286

Power Generation from Coal: Ongoing Developments and Outlook  

Microsoft Academic Search

Coal is an important source of energy for the world, particularly for power generation. To meet the growth in demand for energy over the past decade, the contribution from coal has exceeded that of any other energy source. Additionally, coal has contributed almost half of total growth in electricity over the past decade. As a result, CO2 emissions from coal-fired

Keith Burnard; Sankar Bhattacharya

2011-01-01

287

Development of a photovoltaic power supply for wireless sensor networks.  

SciTech Connect

This report examines the design process of a photovoltaic (solar) based power supply for wireless sensor networks. Such a system stores the energy produced by an array of photovoltaic cells in a secondary (rechargeable) battery that in turn provides power to the individual node of the sensor network. The goal of such a power supply is to enable a wireless sensor network to have an autonomous operation on the order of years. Ideally, such a system is as small as possible physically while transferring the maximum amount of available solar energy to the load (the node). Within this report, there is first an overview of current solar and battery technologies, including characteristics of different technologies and their impact on overall system design. Second is a general discussion of modeling, predicting, and analyzing the extended operation of a small photovoltaic power supply and setting design parameters. This is followed by results and conclusions from the testing of a few basic systems. Lastly, some advanced concepts that may be considered in order to optimize future systems will be discussed.

Harvey, Matthew R.; Kyker, Ronald D.

2005-06-01

288

Space Solar Power Satellite Technology Development at the Glenn Research Center: An Overview  

NASA Technical Reports Server (NTRS)

NASA Glenn Research Center (GRC). is participating in the Space Solar Power Exploratory Research and Technology program (SERT) for the development of a solar power satellite concept. The aim of the program is to provide electrical power to Earth by converting the Sun's energy and beaming it to the surface. This paper will give an overall view of the technologies being pursued at GRC including thin film photovoltaics, solar dynamic power systems, space environmental effects, power management and distribution, and electric propulsion. The developmental path not only provides solutions to gigawatt sized space power systems for the future, but provides synergistic opportunities for contemporary space power architectures. More details of Space Solar Power can be found by reading the references sited in this paper and by connecting to the web site http://moonbase.msfc.nasa.gov/ and accessing the "Space Solar Power" section "Public Access" area.

Dudenhoefer, James E.; George, Patrick J.

2000-01-01

289

Power Sector Reform in Developing Countries: A Return to Basics  

SciTech Connect

Instead of following the Restructuring Model most often used in the international community since the 1990s, developing countries should adopt an alternative conceptual model called the Integrated Model in order to develop and implement effective electricity reform programs. (author)

Douglas, James B.

2006-12-15

290

Development of a high-power lithium-ion battery  

NASA Astrophysics Data System (ADS)

Safety is a key concern for a high-power energy storage system such as will be required in a hybrid vehicle. Present lithium-ion technology, which uses a carbon/graphite negative electrode, lacks inherent safety for two main reasons: (1) carbon/graphite intercalates lithium at near lithium potential, and (2) there is no end-of-charge indicator in the voltage profile that can signal the onset of catastrophic oxygen evolution from the cathode (LiCoO 2). Our approach to solving these safety/life problems is to replace the graphite/carbon negative electrode with an electrode that exhibits stronger two-phase behavior further away from lithium potential, such as Li 4Ti 5O 12. Cycle-life and pulse-power capability data are presented in accordance with the Partnership for a New Generation of Vehicles (PNGV) test procedures, as well as a full-scale design based on a spreadsheet model.

Jansen, A. N.; Kahaian, A. J.; Kepler, K. D.; Nelson, P. A.; Amine, K.; Dees, D. W.; Vissers, D. R.; Thackeray, M. M.

291

Development and Use of the Galileo and Ulysses Power Sources  

SciTech Connect

Paper presented at the 45th Congress of the International Astronautical Federation, October 1994. The Galileo mission to Jupiter and the Ulysses mission to explore the polar regions of the Sun required a new power source: the general-purpose heat source radioisotope thermoelectric generator (GPHS-RTG), the most powerful RTG yet flow. Four flight-qualified GPHS-RTGs were fabricated with one that is being used on Ulysses, two that are being used on Galileo and one that was a common spare (and is now available for the Cassini mission to Saturn). In addition, and Engineering Unit and a Qualification Unit were fabricated to qualify the design for space through rigorous ground tests. This paper summarizes the ground testing and performance predictions showing that the GPHS-RTGs have met and will continue to meet or exceed the performance requirements of the ongoing Galileo and Ulysses missions. There are two copies in the file.

Bennett, Gary L; Hemler, Richard J; Schock, Alfred

1994-10-01

292

The development of high power Li\\/SOCl2 batteries  

Microsoft Academic Search

Electrochemical testing and mathematical modeling has led to the design of Li\\/SOCl2 batteries weighing 25 lbs capable of delivering 50 kW. The goal was to achieve the highest possible specific power and energy in a 4.2 kWh battery. The battery should deliver a minimum 2 kW\\/lb during periodic short discharges over its 5-10 year lifetime. This presents a number of

Peter Harris; Martin Guentert; Franz Goebel

1990-01-01

293

CCMR: Development of a High Power Membraneless Fuel Cell  

NSDL National Science Digital Library

Fuel cells can convert the chemical energy from an electrochemical reaction into electrical energy. Typically, hydrogen gas/oxygen gas fuel cells have a proton exchange membrane (PEM) that keeps the fuel and oxidant from mixing and allows protons to travel from the anode surface to the cathode surface. By establishing laminar flow, the Abruña group has been able to eliminate the need for a PEM in a micro fuel cell. Data obtained by running 150mM NaBH4 in 3M NaOH (fuel) and 0.5 M Ce(NH4)2(NO3)6 in 1M HNO3 (oxidant) through these membraneless micro fuel cells indicate that they have much higher power density than most direct methanol fuel cells and use much less fuel. Recently, a scaled up version of these micro fuel cells was built. If this scaled up membraneless fuel cell can be successfully assembled and run using the same fuel and oxidant, then previously obtained performance data indicates that enough power should be generated to power an iPod Nano. It will also indicate that the design is scalable and is commercially practical.

Watts, David J.

2009-08-15

294

TEPCO's Approach to Power-Engineer Human Resource Development  

NASA Astrophysics Data System (ADS)

We think 'human resources and technology' is developed only by self-training continuously, keeping higher motivation and practicing repeatedly. Moreover it is indispensable for sustainable development of company. Management vision, top-down message with vertical communication, and bottom-up systematic approaches are necessary for sustainable human resource development, sharing the value with coordination, and in addition, OJT and Off-JT method should be used effectively. This paper shows TEPCO's attempts to develop engineers' technical skills as a reference of a in-company continuing professional development.

Sato, Masaki

295

"Power To" or "Power Over": Reflections on Issues of Power Raised in Development Courses for Educational Managers.  

ERIC Educational Resources Information Center

The management style of a school leader deeply influences the ethos of a school. To explicate the workings of power in such leaders, an analysis of education management styles is presented here. The paper works from the premise that effective and productive management styles are empowering. The text acknowledges how difficult it is to frame a…

Gold, Anne

296

Engineering development of coal-fired high-performance power systems. Technical report, July - September 1996.  

National Technical Information Service (NTIS)

A High Performance Power System (HIPPS) is being developed. This system is a coal-fired, combined cycle plant with indirect heating of gas turbine air. Foster Wheeler Development Corporation and a team consisting of Foster Wheeler Energy Corporation, Alli...

1996-01-01

297

ASME development of risk-based inspection guidelines for nuclear power plants.  

National Technical Information Service (NTIS)

A methodology has been developed for use in preparing guidelines for the in-service inspection of nuclear power plant pressure boundary and structural components. This methodology is a further development of a general methodology previously published by t...

B. F. Gore, K. R. Balkey

1992-01-01

298

Development and Testing of a Prototype Grid-Tied Photovoltaic Power System  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center (GRC) has developed and tested a prototype 2 kW DC grid-tied photovoltaic (PV) power system at the Center. The PV system has generated in excess of 6700 kWh since operation commenced in July 2006. The PV system is providing power to the GRC grid for use by all. Operation of the prototype PV system has been completely trouble free. A grid-tied PV power system is connected directly to the utility distribution grid. Facility power can be obtained from the utility system as normal. The PV system is synchronized with the utility system to provide power for the facility, and excess power is provided to the utility. The project transfers space technology to terrestrial use via nontraditional partners. GRC personnel glean valuable experience with PV power systems that are directly applicable to various space power systems, and provide valuable space program test data. PV power systems help to reduce harmful emissions and reduce the Nation s dependence on fossil fuels. Power generated by the PV system reduces the GRC utility demand, and the surplus power aids the community. Present global energy concerns reinforce the need for the development of alternative energy systems. Modern PV panels are readily available, reliable, efficient, and economical with a life expectancy of at least 25 years. Modern electronics has been the enabling technology behind grid-tied power systems, making them safe, reliable, efficient, and economical with a life expectancy of at least 25 years. Based upon the success of the prototype PV system, additional PV power system expansion at GRC is under consideration. The prototype grid-tied PV power system was successfully designed and developed which served to validate the basic principles described, and the theoretical work that was performed. The report concludes that grid-tied photovoltaic power systems are reliable, maintenance free, long life power systems, and are of significant value to NASA and the community.

Eichenberg, Dennis J.

2009-01-01

299

The 40-kw field test power plant modification and development, phase 2  

NASA Technical Reports Server (NTRS)

Progression on the design and development of a 40 KW fuel cell system for on-site installation for providing both thermal and electrical power is reported. Development of the steam reformer fuel processor, power section, inverter, control system, and thermal management and water treatment systems is described.

1980-01-01

300

Civilian nuclear power on the drawing board: the development of Experimental Breeder Reactor-II  

Microsoft Academic Search

On September 28, 2001 a symposium was held at Argonne National Laboratory as part of the festivities to mark the 100th birthday of Enrico Fermi. The symposium celebrated Fermi's ''contribution to the development of nuclear power'' and focused on one particular ''line of development'' resulting from Fermi's interest in power reactors: Argonne's fast reactor program. Symposium participants made many references

Westfall

2003-01-01

301

Development of design tool for hybrid power systems of hybrid electric military combat vehicles  

Microsoft Academic Search

This paper introduces a developed hybrid power modeling and simulation tool for series hybrid electric military combat vehicles. A simulation tool for determining optimal hybrid power in hybrid components such as motor, engine, generator, and storages and for evaluating designed driving control strategy and energy management strategy is essential in designing a hybrid system. The developed tool is based on

Dong Hwan Choi; Seong Jun Lee; Bo-Hyung Cho; Yeo Giel Yoon

2010-01-01

302

Advanced heat source development for static and dynamic radioisotope space power systems  

Microsoft Academic Search

An advanced radioisotope heat source development for spacecraft power ; systems using thermoelectric generators or Brayton, Rankine, or Stirling power ; cycles is described. In the past, the majority of heat sources developed and ; launched have been comprised of one or two capsules containing the total fuel ; inventory in a single reentry heat shield. The new technology in

F. A. Schumann; W. E. Osmeyer

1975-01-01

303

Development of a MEMS-Based Rankine Cycle Steam Turbine For Power Generation: Project Status  

Microsoft Academic Search

This paper summarizes de challenges, prospects, and status of the on-going project to develop a MEMS-based microturbine device that implements a steam Rankine power cycle for portable power generation. First, the device configuration is motivated by a discussion of the unique characteristics of the Rankine cycle. Progress to date on the development of the rotating and thermal subsystems is then

L. G. Fréchette; C. Lee; S. Arslan

2004-01-01

304

Innovation Approaches to Development and Ground Testing of Advanced Bimodal Space Power and Propulsion Systems  

Microsoft Academic Search

The last major development effort for nuclear power and propulsion systems ended in 1993. Currently, there is not an initiative at either the National Aeronautical and Space Administration (NASA) or the U.S. Department of Energy (DOE) that requires the development of new nuclear power and propulsion systems. Studies continue to show nuclear technology as a strong technical candidate to lead

Thomas Johnathan Hill; Cheryl Ann Noble; J. Martinell; S. Borowski

2000-01-01

305

DEVELOPMENT AND APPLICATION OF PROBABILISTIC SAFETY ASSESSMENT PSA IN DAYA BAY NUCLEAR POWER STATION  

Microsoft Academic Search

This paper discusses the development and application of Level 1 PSA used for safety review, risk monitoring and on line maintenance of the nuclear power plant. PSA development includes the analysis of event tree, fault tree, FMEA, PSA quantification and the equipment reliability database. We have collected and processed the reliability data of external power source, the equipment reliability data

Weigang Huang; Jiefei Chen; Jianbing Guo; Wei Zhen

306

Power Hardware-in-the-loop Simulation of a Gas Engine Cogeneration System for Developing a Power Converter System  

NASA Astrophysics Data System (ADS)

This research focuses on the development scheme of a power converter in a gas engine cogeneration system using a power hardware-in-the-loop simulation. A matrix converter is adopted to substitute a conventional ac/dc/ac converter and transfers three phase electricity to single phase electricity directly. To inevstigate the interaction between gas engine-generator unit and the proposed matrix converter, a power hardware-in-the-loop simulation is carried out, in which a piece of real matrix converter is installed in the simulation loop and interfaces with the numerical model of gas engine-generator unit. Numerical models of gas engine and generator are presented and verified by experiment. The configuration of the power hardware-in-the-loop simulation is described and results are also presented, through which the practical application of matrix converter is well demonstrated.

Hong, Miao; Horie, Satoshi; Miura, Yushi; Ise, Tosifumi; Sato, Yuki; Momose, Toshinari; Dufour, Christian

307

TEPCO's Approach to Power-Engineer Human Resource Development  

Microsoft Academic Search

We think 'human resources and technology' is developed only by self-training continuously, keeping higher motivation and practicing repeatedly. Moreover it is indispensable for sustainable development of company. Management vision, top-down message with vertical communication, and bottom-up systematic approaches are necessary for sustainable human resource development, sharing the value with coordination, and in addition, OJT and Off-JT method should be used

Masaki Sato

2006-01-01

308

Within- and between-session reliability of power, force, and rate of force development during the power clean.  

PubMed

Although there has been extensive research regarding the power clean, its application to sports performance, and use as a measure of assessing changes in performance, no research has determined the reliability assessing the kinetics of the power clean across testing session. The aim of this study was to determine the within- and between-session reliability of kinetic variables during the power clean. Twelve professional rugby league players (age 24.5 ± 2.1 years; height 182.86 ± 6.97 cm; body mass 92.85 ± 5.67 kg; 1 repetition maximum [1RM] power clean 102.50 ± 10.35 kg) performed 3 sets of 3 repetitions of power cleans at 70% of their 1RM, while standing on a force plate, to determine within-session reliability and repeated on 3 separate occasions to determine reliability between sessions. Intraclass correlation coefficients revealed a high reliability within- (r ? 0.969) and between-sessions (r ? 0.988). Repeated-measures analysis of variance showed no significant difference (p > 0.05) in peak vertical ground reaction force, rate of force development, and peak power between sessions, with small standard error of the measurements and smallest detectable differences for each kinetic variable (3.13 and 8.68 N; 84.39 and 233.93 N·s; 24.54 and 68.01 W, respectively). Therefore, to identify a meaningful change in performance, the strength and conditioning coach should look for a change in peak force ?8.68 N, rate of force development ?24.54 N·s, and a change in peak power ?68.01 W to signify an adaptive response to training, which is greater than the variance between sessions, in trained athletes proficient at performing the power clean. PMID:22843043

Comfort, Paul

2013-05-01

309

Synergistic Catalysis: A Powerful Synthetic Strategy for New Reaction Development  

PubMed Central

Synergistic catalysis is a synthetic strategy wherein both the nucleophile and the electrophile are simultaneously activated by two separate and distinct catalysts to afford a single chemical transformation. This powerful catalysis strategy leads to several benefits, specifically synergistic catalysis can (i) introduce new, previously unattainable chemical transformations, (ii) improve the efficiency of existing transformations, and (iii) create or improve catalytic enantioselectivity where stereocontrol was previously absent or challenging. This perspective aims to highlight these benefits using many of the successful examples of synergistic catalysis found in the literature.

Allen, Anna E.; MacMillan, David W. C.

2012-01-01

310

Photovoltaic power systems for rural areas of developing countries  

NASA Technical Reports Server (NTRS)

Photovoltaic (PV) applications for rural areas of underdeveloped countries are discussed in relation to PV system technology, reliability, and present and projected cost. The information presented is derived mainly from NASA, Lewis Research Center experience with PV systems deployed with a variety of users for applications relevant to LDCs. A detailed description of two village power systems is included. Energy cost comparisons are presented for PV systems versus alternative energy sources. It is concluded, based on present PV system technology, reliability and cost that photovoltaics provides a realistic energy option for LDCs in both the near- and far-term.

Rosenblum, L.; Bifano, W. J.; Hein, G. F.; Ratajczak, A. F.

1979-01-01

311

Power supply technologies - Keystones for space and terrestrial development  

NASA Astrophysics Data System (ADS)

Terrestrial and space energy systems share such technical requirements as high conversion efficiencies, long service life, high reliability, and substantial adaptability to user requirements, in conjunction with growth capacity. Attention is presently given to current technological possibilities in solar energy utilization, energy storage, and such regenerative media energy-supply concepts as solar cells. Both solar-dynamic and photovoltaic solar systems are discussed; the former may operate according to the Stirling, organic Rankine, or Brayton cycles. In any of these cases, solar dynamic power systems will benefit from extensive existing experience with turbomachinery.

Fritzsche, A.; Reich, G.; Schwarzott, W.

1990-10-01

312

The development of power specific redlines for SSME safety monitoring  

NASA Astrophysics Data System (ADS)

Over the past several years, there has been an increased awareness in the necessity for rocket engine health monitoring because of the cost and complexity of present and future systems. A current rocket engine system, the Space Shuttle Main Engine (SSME), combines a limited redline system with closed-loop control of the engine's thrust level and mixture ratio. Despite these features, 27 tests of the SSME have resulted in major incidents. A SSME transient model was used to examine the effect of variations in high pressure turbopump performance on various engine parameters. Based on analysis of the responses, several new parameters are proposed for further investigation as power-level specific redlines.

Maul, William A.; Bosch, Claudia M.

1989-06-01

313

Development of safety assessment of nuclear power plants using indicators.  

National Technical Information Service (NTIS)

The study is based on an indicator system which is under development at the Radiation and Nuclear Safety Authority (STUK). The goal of this study was to define and develop both PSA-based indicators and indicators from failure statistics. As PSA-based indi...

P. Tiippana

1997-01-01

314

Literacy, Knowledge, Power, and Development--Multiple Connections.  

ERIC Educational Resources Information Center

Development must offer people not only release from poverty but also social esteem and political freedom. While knowledge production has exploded, its distribution and use is still limited, especially in the Third World. Literacy is the most promising means of bringing information and technology to common people in developing nations. Each country…

Bhola, H. S.

315

Development of Micromachine Gas Turbine for Portable Power Generation  

NASA Astrophysics Data System (ADS)

Micromachine gas turbine with centrifugal impellers of 10mm diameter fabricated by 5-axis micro-milling is under development at Tohoku University, in conjunction with Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI), Tohoku-Gakuin University, and Sankyo Seiki Mfg. Co., Ltd. The development is currently at the stage of proving the feasibility of the gas turbine cycle by component tests. Micro-combustors have been developed for both hydrogen and methane fuel. Over 99.9% of the combustion efficiency has been realized in both combustors and the baseline configuration of the combustor for the gas turbine is set. A compressor of 10mm diameter has been developed as a micromachined turbocharger. The performance test of the micromachined turbocharger has been started, and ran up to 566000rpm, which is approximately 65% of the design speed. Compressor performance has been successfully measured along a constant speed line at 55% of the design speed.

Isomura, Kousuke; Tanaka, Shuji; Togo, Shinichi; Kanebako, Hideki; Murayama, Motohide; Saji, Nobuyoshi; Sato, Fumihiro; Esashi, Masayoshi

316

Nuclear power in developing countries: an analysis of decision making  

SciTech Connect

This study began in the fall of 1978, unaware of the problems to be encountered as the project unfolded. The editors focused explicitly on nuclear power generation, avoiding Third World nuclear proliferation and weapons potential. Although preferring to include authors with backgrounds in the countries being studied, nonnationals were not excluded when their research or experience included the proper perspectives or insights. Because of the sensitivity of the nuclear issue in some of the countries, it was necessary in some cases to obtain replacement authors. In spite of the problems encountered in completing the project, the editors feel the case studies yielded useful insights for the entire global community; further, a firm intellectual base was established for future work in the area. A separate abstract was prepared for each of the 19 chapters.

Katz, J.E.; Marwah, O.S.

1982-01-01

317

Advanced Gas Turbine (AGT) power-train system development  

NASA Technical Reports Server (NTRS)

Technical work on the design and component testing of a 74.5 kW (100 hp) advanced automotive gas turbine is described. Selected component ceramic component design, and procurement were tested. Compressor tests of a modified rotor showed high speed performance improvement over previous rotor designs; efficiency improved by 2.5%, corrected flow by 4.6%, and pressure ratio by 11.6% at 100% speed. The aerodynamic design is completed for both the gasifier and power turbines. Ceramic (silicon carbide) gasifier rotors were spin tested to failure. Improving strengths is indicated by burst speeds and the group of five rotors failed at speeds between 104% and 116% of engine rated speed. The emission results from combustor testing showed NOx levels to be nearly one order of magnitude lower than with previous designs. A one piece ceramic exhaust duct/regenerator seal platform is designed with acceptable low stress levels.

Helms, H. E.; Johnson, R. A.; Gibson, R. K.

1982-01-01

318

Integrated Power and Attitude Control System (IPACS) technology developments  

NASA Technical Reports Server (NTRS)

Integrated Power and Attitude Control System (IPACS) studies performed over a decade ago established the feasibility of storing electrical energy in flywheels and utilizing the resulting angular momentum for spacecraft attitude control. Such a system has been shown to have numerous attractive features relative to more contemporary technology, and is appropriate to many applications (including high-performance slewing actuators). Technology advances over the last two decades in composite rotors, motor/generator/electronics, and magnetic bearings are found to support the use of IPACS for increasingly sophisticated applications. It is concluded that the concept offers potential performance advantages as well as savings in mass and life-cycle cost. Viewgraphs and discussion on IPACS are included.

Eisenhaure, David B.; Bechtel, Robert; Hockney, Richard; Oglevie, Ron; Olszewski, Mitch

1990-01-01

319

Factors driving wind power development in the United States  

SciTech Connect

In the United States, there has been substantial recent growth in wind energy generating capacity, with growth averaging 24 percent annually during the past five years. About 1,700 MW of wind energy capacity was installed in 2001, while another 410 MW became operational in 2002. This year (2003) shows promise of significant growth with more than 1,500 MW planned. With this growth, an increasing number of states are experiencing investment in wind energy projects. Wind installations currently exist in about half of all U.S. states. This paper explores the key factors at play in the states that have achieved a substantial amount of wind energy investment. Some of the factors that are examined include policy drivers, such as renewable portfolio standards (RPS), federal and state financial incentives, and integrated resource planning; as well as market drivers, such as consumer demand for green power, natural gas price volatility, and wholesale market rules.

Bird, Lori A.; Parsons, Brian; Gagliano, Troy; Brown, Matthew H.; Wiser, Ryan H.; Bolinger, Mark

2003-05-15

320

The Power of Rich Syntax for Model-based Development  

Microsoft Academic Search

During the last century, many general purpose program- ming languages have been developed, all having rigid syn- tax and often a von-Neuman view of the world. With the rise of model-based development this changes: Feature- oriented programming, domain specific languages, and platform-based design use rich and custom syntaxes to capture domain specific abstractions, refinement mappings, and design spaces. In this

Ethan K. Jackson; Wolfram Schulte; Janos Sztipanovits

321

Activity and accomplishments of dish/Stirling electric power system development  

NASA Technical Reports Server (NTRS)

The development of the solar parabolic-dish/Stirling-engine electricity generating plant known as the dish/Stirling electric power system is described. The dish/Stirling electric power system converts sunlight to electricity more efficiently than any known existing solar electric power system. The fabrication and characterization of the test bed concentrators that were used for Stirling module testing and of the development of parabolic dish concentrator No. 2, an advanced solar concentrator unit considered for use with the Stirling power conversion unit is discussed.

Livingston, F. R.

1985-01-01

322

High power laser research and development at the Laboratory for Laser Energetics  

SciTech Connect

As part of its research mission - to investigate the interaction of intense radiation with matter - the Laboratory for Laser Energetics (LLE) of the University of Rochester is developing a number of high-peak power and high-average-power laser systems. In this paper we highlight some of the LLE work on solid-state laser research, development and applications. Specifically, we discuss the performance and operating characteristics of Omega, a twenty-four beam, 4000 Joule, Nd:glass laser system which is frequently tripled using the polarization mismatch scheme. We also discuss progress in efforts to develop high-average-power solid-state laser systems with active-mirror and slab geometries and to implement liquid-crystal devices in high-power Nd:glass lasers. Finally we present results from a program to develop a compact, ultrahigh-peak-power solid-state laser using the concept of frequency chirped pulse amplification.

Soures, J.M.; McCrory, R.L.; Cerqua, K.A.; Craxton, R.S.; Hutchison, R.; Jacobs, S.D.; Kessler, T.; Kelly, J.; Mourou, G.; Seka, W.

1986-01-01

323

Materials advances to enhance development of geothermal power  

SciTech Connect

In order to assure the continued development of geothermal resources, many advances in materials technology are required so that high costs resulting from the severe environments encountered during drilling, well completion and energy extraction can be reduced. These needs will become more acute as higher temperature and chemically aggressive fluids are encountered. High priority needs are for lost circulation control and lightweight well completion materials, and tools such as drill pipe protectors, rotating head seals, blow-out preventers, and downhole drill motors. The lack of suitable hydrolytically stable chemical systems that can bond previously developed elastomers to metal reinforcement is a critical but as yet unaddressed impediment to the development of these tools. In addition, the availability of low cost corrosion and scale-resistant tubular lining materials would greatly enhance transport and energy extraction processes utilizing hypersaline brines. Work to address these materials needs is underway at Brookhaven National Laboratory (BNL), and recent accomplishments are summarized in the paper. 15 refs.

Kukacka, L.E.

1989-03-01

324

Advanced on-site power plant development technology program  

NASA Technical Reports Server (NTRS)

A 30-cell stack was tested for 7200 hours. At 6000 hours the stack was successfully refilled with acid with no loss of performance. A second stack containing the advanced Configuration B cell package was fabricated and assembled for testing in 1985. A 200-kW brassboard inverter was successfully evaluated, verifying the design of the two-bridge ASCR circuit design. A fuel processing catalyst train was tested for 2000 hours verifying the catalyst for use in a 200-kW development reformer. The development reformer was fabricated for evaluation in 1985. The initial test plan was prepared for a 200-kW verification test article.

Kemp, F. S.

1985-01-01

325

Photovoltaics. [research and development of terrestrial electric power systems  

NASA Technical Reports Server (NTRS)

The federal government has sponsored a program of research and development on terrestrial photovoltaic systems that is designed to reduce the costs of such systems through technological advances. There are many potential paths to lower system costs, and successful developments have led to increased private investment in photovoltaics. The prices for photovoltaic collectors and systems that appear to be achievable within this decade offer hope that the systems will soon be attractive in utility applications within the United States. Most of the advances achieved will also be directly applicable to the remote markets in which photovoltaic systems are now commercially successful

Smith, J. L.

1981-01-01

326

Satellite power system: Concept development and evaluation program. Volume 3: Power transmission and reception. Technical summary and assessment  

NASA Technical Reports Server (NTRS)

Efforts in the DOE/NASA concept development and evaluation program are discussed for the solar power satellite power transmission and reception system. A technical summary is provided together with a summary of system assessment activities. System options and system definition drivers are described. Major system assessment activities were in support of the reference system definition, solid state system studies, critical technology supporting investigations, and various system and subsystem tradeoffs. These activities are described together with reference system updates and alternative concepts for each of the subsystem areas. Conclusions reached as a result of the numerous analytical and experimental evaluations are presented. Remaining issues for a possible follow-on program are identified.

Dietz, R. H.; Arndt, G. D.; Seyl, J. W.; Leopold, L.; Kelley, J. S.

1981-01-01

327

Development of Thin-Film Battery Powered Transdermal Medical Devices.  

National Technical Information Service (NTIS)

Research carried out at ORNL has led to the development of solid state thin- film rechargeable lithium and lithium-ion batteries. These unique devices can be fabricated in a variety of shapes and to any required size, large or small, on virtually any type...

J. B. Bates T. Sein

1999-01-01

328

Development Status of the NSTAR Ion Propulsion System Power Processor.  

National Technical Information Service (NTIS)

A 0.5-2.3 kW xenon ion propulsion system is presently being developed under the NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) program. This propulsion system includes a 30 cm diameter xenon ion thruster, a Digital Control Interfa...

J. A. Hamley L. R. Pinero V. K. Rawlin J. R. Miller K. C. Cartier

1995-01-01

329

Advanced PEFC development for fuel cell powered vehicles  

NASA Astrophysics Data System (ADS)

Vehicles equipped with fuel cells have been developed with much progress. Outcomes of such development efforts include a Toyota fuel cell electric vehicle (FCEV) using hydrogen as the fuel which was developed and introduced in 1996, followed by another Toyota FCEV using methanol as the fuel, developed and introduced in 1997. In those Toyota FCEVs, a fuel cell system is installed under the floor of each RAV4L, to sports utility vehicle. It has been found that the CO concentration in the reformed gas of methanol reformer can be reduced to 100 ppm in wide ranges of catalyst temperature and gas flow rate, by using the ruthenium (Ru) catalyst as the CO selective oxidizer, instead of the platinum (Pt) catalyst known from some time ago. It has been also found that a fuel cell performance equivalent to that with pure hydrogen can be ensured even in the reformed gas with the carbon monoxide (CO) concentration of 100 ppm, by using the Pt-Ru (platinum ruthenium alloy) electrocatalyst as the anode electrocatalyst of a polymer electrolyte fuel cell (PEFC), instead of the Pt electrocatalyst known from some time ago.

Kawatsu, Shigeyuki

330

Development of partial oxidizer/reformer for PAFC power plants  

NASA Astrophysics Data System (ADS)

The development of a methanol partial oxidation reformer designed to provide hydrogen to a 3 kW Phosphoric Acid Fuel Cell Powerplant is discussed. The partial oxidation reformer operates on neat methanol and utilizes the fuel cell cathode exhaust stream as the oxidant.

Christner, L. G.; Steinfeld, G.

1985-11-01

331

The Power of Planning Developing Effective Read-Alouds  

ERIC Educational Resources Information Center

In the midst of many circle times, one can overhear small voices adding to the words from the book being read aloud by the teacher. Sometimes the children's words relate to the text, sometimes not. Early childhood educators recognize the importance of reading aloud every day to develop children's language and early literacy skills. Recommendations…

Shedd, Meagan K.; Duke, Nell K.

2008-01-01

332

Development of NPP (Nuclear Power Plants) Operational Safety Training Courses.  

National Technical Information Service (NTIS)

The objective of the project is to develop a training course text for the betterment of reactor operation and assurance of its safety in general by providing training materials of the advanced compact nuclear simulator which will become operation in Septe...

C. K. Lee D. S. Lee B. S. Lee W. K. Lee H. R. Juhn

1987-01-01

333

Aluminum-Air Power Cell Research and Development Progress Report.  

National Technical Information Service (NTIS)

The wedge-shaped cell design, of the aluminum-air battery being developed, is mechanically simple and capable of full anode utilization and rapid full or partial recharge. To maintain constant interelectrode separation and to collect anodic current, the c...

J. F. Cooper

1984-01-01

334

A Power Consumption Analysis Technique Using UML-Based Design Models in Embedded Software Development  

NASA Astrophysics Data System (ADS)

Although the power consumption of embedded system depends on the operation of hardware devices, software behaviors give great effect to the power consumption because of its functionality and complexity growth. This paper proposes a power consumption estimation technique using design models of software to support energy-efficient embedded software development. Even though code-based power analysis techniques have been proposed, these techniques have demerits that the analysis time is long and feedback is not easy. Our proposed technique makes use of UML behavior models for the power consumption analysis in order to overcome the demerits of code-based analysis. When comparing with the existing code-based analysis, our technique can provide the power analysis result at earlier phase than implementation. Therefore, software engineer can apply our technique to select energy-efficient design decisions in embedded software development process.

Kim, Doo-Hwan; Kim, Jong-Phil; Hong, Jang-Eui

335

Predicting premature mortality from new power plant development in Virginia.  

PubMed

The authors estimated the number of premature deaths from particulate matter less than 2.5 microm (PM2.5) that would result from making 29 proposed fossil fuel power plants in Virginia operational. We used a U.S. Environmental Protection Agency air quality model (Climatological Regional Dispersion model) to calculate changes in ambient concentrations of PM2.5 and Cox proportional hazard modeling to calculate the resulting premature mortality. The model predicted that if all 29 plants were operational, PM2.5 concentrations would rise in 271 counties across 19 states 5 and increased average annual PM2.5 concentrations would result in a rate of 17 deaths per 37,900,026 people aged 30 yr and older (0.45 deaths per million, 95% confidence interval = 0.31, 0.59) per year by the end of 2004, increasing thereafter. Over a 6 yr period, 104 cumulative excess deaths would occur due to operations of these proposed plants. The authors recommend that precautionary principles be considered when policy decisions related to energy production from fossil fuels are made. PMID:16425664

Hermann, Richard P; Divita, Frank; Lanier, Jack O

2004-10-01

336

Commercial Research and Development: Power to Explore, Opportunities from Discovery  

NASA Technical Reports Server (NTRS)

The technical and economic goals of commercial use of space are laudable, and are addressed as a high priority by almost every national space program and most major aerospace companies the world over. Yet, the focus of most organizational agendas and discussions tends to focus on one or two very narrow enabling aspects of this potentially large technological and economic opportunity. While government sponsored commercial launch activities and private space platforms are an integral part of efforts to leverage the commercial use of space, these activities are possibly one of the smallest parts of creating, a viable and sustainable market for the commercial use of space. Most of the current programs usually do not appropriately address some of the critical issues of the current, already interested, potential space user communities. Current programs place the focus of the majority of the user requirements on the vehicle payload weight and mass performance considerations as the primary payload economical factor in providing a commercial market with a stimulating price for gaining access to the space environment. The larger user challenges of transformation from Earth-based research and development approaches to space environment approaches are not addressed early enough in programs to impact the new business considerations of potential users. Currently, space-based research and development user activities require a large user investment in time, in development of new areas of support expertise, in development of new systems, in risk of schedule to completion, and in long term capital positioning. The larger opportunities for stimulating a strong market driven interest in commercial use of space that could result from the development of vehicle payload "leap ahead technologies" for users are being missed, and there is a real risk of limiting the potentially broader market base to support a more technologically advanced and economically lucrative outcome. A major driving force for strengthening the commercial space activities is not only the technological advances in launch vehicle, or newer satellites, but the myriad of enabling payloads technologies that could, as a goal, result in an almost transparent facilitation to regular CD a, -n access to space and microgravity environments by the future users from the existing Earth-based research and development organizations market segments. Rather than focusing only on developing high lift performance launch vehicles and then developing payloads to fit them, the real focus from a business model perspective should to be on the customer payloads requirements, and on designing launch vehicles and platforms systems for a space transportation and facility infrastructure to support all aspects of the business model for the user market. To harness the full potential of space commercialization, new efforts need to be made to comprehensively examine all the critical business model areas for commercial research, development, and manufacturing in space so as to identify specific products and efforts; to determine how such operations must be both similar to and different from current Earth-based activities; to evaluate the enabling technological devices, processes and efforts so that like efforts can be addressed in a synergistic fashion for maximum user cost effectiveness; to delineate the services that are both needed and can be provided by such activities; and to use this information to drive design and development of space commercialization efforts and policy.

Casas, Joseph C.; Nall, Mark; Powers, C. Blake; Henderson, Robin N. (Technical Monitor)

2002-01-01

337

Developing Information Power Grid Based Algorithms and Software  

NASA Technical Reports Server (NTRS)

This was an exploratory study to enhance our understanding of problems involved in developing large scale applications in a heterogeneous distributed environment. It is likely that the large scale applications of the future will be built by coupling specialized computational modules together. For example, efforts now exist to couple ocean and atmospheric prediction codes to simulate a more complete climate system. These two applications differ in many respects. They have different grids, the data is in different unit systems and the algorithms for inte,-rating in time are different. In addition the code for each application is likely to have been developed on different architectures and tend to have poor performance when run on an architecture for which the code was not designed, if it runs at all. Architectural differences may also induce differences in data representation which effect precision and convergence criteria as well as data transfer issues. In order to couple such dissimilar codes some form of translation must be present. This translation should be able to handle interpolation from one grid to another as well as construction of the correct data field in the correct units from available data. Even if a code is to be developed from scratch, a modular approach will likely be followed in that standard scientific packages will be used to do the more mundane tasks such as linear algebra or Fourier transform operations. This approach allows the developers to concentrate on their science rather than becoming experts in linear algebra or signal processing. Problems associated with this development approach include difficulties associated with data extraction and translation from one module to another, module performance on different nodal architectures, and others. In addition to these data and software issues there exists operational issues such as platform stability and resource management.

Dongarra, Jack

1998-01-01

338

Development of Low-Speed Low-Capacity Vertical-Axis-Type Wind Power Generator  

NASA Astrophysics Data System (ADS)

We have developed a low-speed and low-capacity wind power generator. In this paper, we introduce the outline of the 5kW multi-polar synchronous generator that generates the electric power efficiently from 50rpm to 180rpm. The generator is produced by a magnetic powder core for cost reduction. We also express the outline and field test results of the low-capacity power plant constructed in Ohmura City, Nagasaki.

Soejima, Katsunori; Higuchi, Tsuyoshi; Abe, Takashi; Hirayama, Tadashi; Kouno, Katsuiti

339

Development of an innovative seawater desalination system using non-grid-connected wind power  

Microsoft Academic Search

An innovative seawater desalination system using non-grid-connected wind power is developed. The system makes full use of the cheap, clean, and renewable sources: non-grid-connection wind power. The system adopts the low-temperature, multi-stage, high-efficiency desalination technology to produce cheap fresh water. It includes five major parts: fixed-pitch variable-speed wind turbine, power converter system, control system, seawater desalination unit and pump units

Weidong Gu; Xiaobin He

2009-01-01

340

Development of the repetitive pulsed power system for spallation neutron source beam extraction fast kicker  

Microsoft Academic Search

The spallation neutron source (SNS) is a next-generation high-intensity beam facility. The extraction kicker system is a high peak power, high average power, high-precision pulse-waveform, low beam impedance, and high repetition rate pulsed power system. It has been successfully designed and developed at Brookhaven National Laboratory, Upton, NY. The system consists of fourteen extraction magnet sections inside the ring vacuum

W. Zhang; Jon Sandberg; Roy Cutler; H. Hahn; R. Lambiase; Y. Y. Lee; J. Mi; T. Nehring; C. Pai; K. Rust; N. Tsoupas; J. Tuozzolo; D. Warburton; Jie Wei; S. Y. Zhang

2004-01-01

341

Automated Test Equipment for High Power Solid State Device Development and Characterization  

Microsoft Academic Search

This paper describes an automated High Power Amplifier Test System (HPATS) specially designed for tuning, testing and characterization of high power solid state devices during their development. In the 1.0 to 17.0 GHz bandwidth, Si Bipolar, Si MOSFET and GaAs FET transistors with output power up to 150 W for the lower end and up to 25 W for the

R. Basset; D. Raicu; G. Sarkissian; D. Phelps

1996-01-01

342

Engineering development of superconducting RF linac for high-power applications  

SciTech Connect

High-power proton linacs are a promising source of neutrons for material processing and research applications. Superconducting radiofrequency (SCRF) Rf linac technology is preferred for such applications because of power efficiency. A multi-year engineering development program is underway at Los Alamos National Laboratory to demonstrate the required SCRF technology. The program consists of development of SC cavities, power couplers, and cryomodule integration. Prototypes will be built and operated to obtain performance and integration information, and for design improvement. This paper describes the scope and present status of the development program.

Dominic Chan, K.C.; Rusnak, B.; Gentzlinger, R.C.; Campbell, B.M.; Kelley, J.P. [Los Alamos National Lab., NM (United States); Safa, H. [CEA Saclay (France)

1998-12-31

343

Development and support structures for high-power solar arrays  

NASA Technical Reports Server (NTRS)

A number of structurally efficient configurations for wing-type solar arrays are developed by a combination of deepening the planform of the blanket and structure and by partitioning the blanket with battens and frequent attachments to the support structure. This technique reduces the tension required to avoid a low natural frequency for the blanket, and the load reduction results in a lighter structure. The use of three different structures are investigated: the Astromast, the Extendible Support Structure (ESS), and a new beam called the STACBEAM (Stacking Triangular Articulated Compact Beam) and their relative performances are compared. The investigation of the STACBEAM is emphasized because its sequential deployment is more reliable for very long systems, and its linear deployment facilitates local attachments to the blanket and the development of a low mass deployer.

Knapp, K.

1984-01-01

344

Performance development requirements for elastomers of electric power network insulators  

Microsoft Academic Search

The aim of this work was to present some results of the characterization of polymers insulators during their degradation, which are used in transmission threads of 69kV. The intention was to develop performance requirements for these products.A comparative study was done among products collected in the experimental field and the new products artificially aged in laboratory, according to the methodologies

F. Noronha; J. M. G. Angelini; N. C. Góis; L. H. I. Mei

2005-01-01

345

Aluminum-air power cell research and development. Progress report  

Microsoft Academic Search

An aluminum-air battery is under development with the objective of providing an electric vehicle with the range, acceleration and rapid refueling capability of common automobiles. From tested refuelable cell designs, a wedge-shaped cell was chosen for mechanical simplicity and for its capability of full anode utilization and rapid partial- or full-recharge. The cell uses tin-plated copper tracks to maintain a

1984-01-01

346

Development of intermetallic coatings for fusion power applications  

Microsoft Academic Search

In the design of liquid-metal cooling systems, corrosion resistance of structural materials and magnetohydrodynamic (MHD) force and its subsequent influence on thermal hydraulics and corrosion are major concerns. The objective of this study is to develop stable corrosion-resistant electrical insulator coatings at the liquid-metal\\/structural-material interface, with emphasis on electrically insulating coatings that prevent adverse MHD-generated currents from passing through the

J. H. Park; T. Domenico; G. Dragel; R. Clark

1994-01-01

347

New developments in high power eye-safe LMA fibers  

Microsoft Academic Search

In this paper we present advances made in the development and fabrication of highly efficient, large-mode area fibers for eye-safe wavelengths (1.55 mum, 2.0 mum). LMA Er\\/Yb co-doped and Tm doped fibers have been successfully fabricated, with 25 mum core and 250 to 300 mum clad diameters, that are suitable for nanosecond pulsed amplification in LIDAR applications as well as

K. Tankala; B. Samson; A. Carter; J. Farroni; D. Machewirth; N. Jacobson; U. Manyam; A. Sanchez; M.-Y. Chen; A. Galvanauskas; W. Torruellas; Y. Chen

2006-01-01

348

Photovoltaic power systems for rural areas of developing countries  

NASA Technical Reports Server (NTRS)

Systems technology, reliability, and present and projected costs of photovoltaic systems are discussed using data derived from NASA, Lewis Research Center experience with photovoltaic systems deployed with a variety of users. Operating systems in two villages, one in Upper Volta and the other in southwestern Arizona are described. Energy cost comparisons are presented for photovoltaic systems versus alternative energy sources. Based on present system technology, reliability, and costs, photovoltaics provides a realistic energy option for developing nations.

Rosenblum, L.; Bifano, W. J.; Hein, G. F.; Ratajczak, A. F.

1979-01-01

349

Toward the last frontier - A strategy for the evolutionary development of space nuclear power systems  

NASA Technical Reports Server (NTRS)

A number of exciting mission opportunities are being considered for the 21st century, including advanced robotic science missions to the outer planets and beyond, human exploration of the Moon and Mars, and advanced space transportation systems. All of these missions will require some form of nuclear power; however, it is clear that current budgetary constraints preclude developing many different types of space nuclear power systems. This paper reviews the specific civil space missions which have been identified, the power levels and lifetimes required, and the technologies available. From this an evolutionary space nuclear power program is developed which builds upon the experience of radioisotope thermoelectric generators, dynamic isotope power systems, and space nuclear reactors. It is strongly suggested that not only does this approach make technical and budgetary sense but that it is consistent with the normal development of new technologies.

Bennett, Gary L.

1992-01-01

350

Development of fast-rising pulse power supply by using inductive energy storage  

Microsoft Academic Search

This R and D note reports the development of a fast-rising pulse power supply, comparable to the condenser scheme, by using a high-voltage enclosed-type high-speed interrupting element. It has a practical application as a driving power supply for highly repetitive plasma focus research.

Isao Ueno; Yuichi Taguchi; Masaharu Nakazawa; Shohei Takeda

1982-01-01

351

Integrated Process Model Development and Systems Analyses for the LIFE Power Plant  

Microsoft Academic Search

We have developed an integrated process model (IPM) for a Laser Inertial Fusion-Fission Energy (LIFE) power plant. The model includes cost and performance algorithms for the major subsystems of the plant, including the laser, fusion target fabrication and injection, fusion-fission chamber (including the tritium and fission fuel blankets), heat transfer and power conversion systems, and other balance of plant systems.

W R Meier; T Anklam; R Abbott; A Erlandson; W Halsey; R Miles; A J Simon

2009-01-01

352

Geopolitical imaginations across the North-South divide: issues of difference, development and power  

Microsoft Academic Search

In the context of development and the will to be modern, this paper explores key elements of power and representation across the North-South divide. After a short discussion of the problems involved in our contemporary usage of geo-political categories such as North and South, it is argued that the power that has been exercised over peripheral societies needs to be

David Slater

1997-01-01

353

Conceptual definition of a technology development mission for advanced solar dynamic power systems  

Microsoft Academic Search

An initial conceptual definition of a technology development mission for advanced solar dynamic power systems is provided, utilizing a space station to provide a dedicated test facility. The advanced power systems considered included Brayton, Stirling, and liquid metal Rankine systems operating in the temperature range of 1040 to 1400 K. The critical technologies for advanced systems were identified by reviewing

R. P. Migra

1986-01-01

354

Conceptual definition of a technology development mission for advanced solar dynamic power systems. Final report  

Microsoft Academic Search

An initial conceptual definition of a technology development mission for advanced solar dynamic power systems is provided, utilizing a space station to provide a dedicated test facility. The advanced power systems considered included Brayton, Stirling, and liquid metal Rankine systems operating in the temperature range of 1040 to 1400 K. The critical technologies for advanced systems were identified by reviewing

Migra

1986-01-01

355

State-of-the-art and recent developments of high-power gyrotron oscillators  

Microsoft Academic Search

Gyrotron oscillators (gyromonotrons) are mainly used as high-power millimeter wave sources for electron cyclotron resonance heating (ECRH) and diagnostics of magnetically confined plasmas for generation of energy by controlled thermonuclear fusion. High unit power and high efficiency single-mode CW gyrotrons with conventional cylindrical (1 MW) and advanced coaxial (2 MW) cavities are worldwide under development. 118 GHz, 140 GHz and

Manfred Thumm

1999-01-01

356

Development of a Solid-State Microhydraulic Energy Harvesting Mechanism for Heel Strike Power Harvesting.  

National Technical Information Service (NTIS)

A Microhydraulic Transducer (MHT) device was developed with the goal of extracting energy from heel strike motion. The required power output is approximately 1W, with an associated power density of approximately 0.1-1W/kg. The MHT relies on the incorporat...

J. L. Steyn N. W. Hagood

2003-01-01

357

Innovation on Energy Power Technology (17)Development of EMS\\/SCADA in TEPCO  

Microsoft Academic Search

Effective Load Dispatching Automatic Controller (ELDAC) is an EMS\\/SCADA system for Central Load Dispatching Office in Tokyo Electric Power Company Inc. This paper introduces the progress of development of ELDAC, which forecasts demand, sets up the most efficient generation schedule, and controls total power from generators.

Mamoru Suzuki

2009-01-01

358

Innovation on Energy Power Technology (17)Development of EMS/SCADA in TEPCO  

NASA Astrophysics Data System (ADS)

Effective Load Dispatching Automatic Controller (ELDAC) is an EMS/SCADA system for Central Load Dispatching Office in Tokyo Electric Power Company Inc. This paper introduces the progress of development of ELDAC, which forecasts demand, sets up the most efficient generation schedule, and controls total power from generators.

Suzuki, Mamoru

359

The World Bank, Support for Universities, and Asymmetrical Power Relations in International Development  

ERIC Educational Resources Information Center

This article examines the role of the World Bank in advancing higher education sectors in the developing world, considering in particular the increasing power and strength of a global knowledge-based economy. Given the powerful role that intergovernmental organizations such as the World Bank play in shaping global economic policies, the authors…

Collins, Christopher S.; Rhoads, Robert A.

2010-01-01

360

Development of GaN Based Microwave Power Amplifier for X Band Applications.  

National Technical Information Service (NTIS)

The feasibility of utilizing the GaN/AlGaN material system in the development of high power amplifiers for X-band frequencies and above was investigated. The GaN based heterojunction field effect transistor (HFET) on SiC shows remarkable power density at ...

K. W. Alt K. L. Wang

2000-01-01

361

Power.  

ERIC Educational Resources Information Center

This issue addresses advantages and disadvantages of having power. Includes Web sites, CD-ROMs and software, videos, books, and additional resources with suggested age levels and disciplines as well as ideas for appropriate related activities. Sidebars discuss the power of the pen, the power of peace, and the power of the media. (LRW)

Online-Offline, 1999

1999-01-01

362

ICRF array module development and optimization for high power density  

SciTech Connect

This report describes the analysis and optimization of the proposed International Thermonuclear Experimental Reactor (ITER) Antenna Array for the ion cyclotron range of frequencies (ICRF). The objectives of this effort were to: (1) minimize the applied radiofrequency rf voltages occurring in vacuum by proper layout and shape of components, limit the component`s surface/volumes where the rf voltage is high; (2) study the effects of magnetic insulation, as applied to the current design; (3) provide electrical characteristics of the antenna for the development and analysis of tuning, arc detection/suppression, and systems for discriminating between arcs and edge-localized modes (ELMs); (4) maintain close interface with mechanical design.

Ryan, P.M.; Swain, D.W.

1997-02-01

363

Development of high purity large forgings for nuclear power plants  

NASA Astrophysics Data System (ADS)

The recent increase in the size of energy plants has been supported by the development of manufacturing technology for high purity large forgings for the key components of the plant. To assure the reliability and performance of the large forgings, refining technology to make high purity steels, casting technology for gigantic ingots, forging technology to homogenize the material and consolidate porosity are essential, together with the required heat treatment and machining technologies. To meet these needs, the double degassing method to reduce impurities, multi-pouring methods to cast the gigantic ingots, vacuum carbon deoxidization, the warm forging process and related technologies have been developed and further improved. Furthermore, melting facilities including vacuum induction melting and electro slag re-melting furnaces have been installed. By using these technologies and equipment, large forgings have been manufactured and shipped to customers. These technologies have also been applied to the manufacture of austenitic steel vessel components of the fast breeder reactors and components for fusion experiments.

Tanaka, Yasuhiko; Sato, Ikuo

2011-10-01

364

A Comparative Analysis of Community Wind Power DevelopmentModels  

SciTech Connect

For years, farmers in the United States have looked with envy on their European counterparts ability to profitably farm the wind through ownership of distributed, utility-scale wind projects. Only within the past few years, however, has farmer- or community-owned windpower development become a reality in the United States. The primary hurdle to this type of development in the United States has been devising and implementing suitable business and legal structures that enable such projects to take advantage of tax-based federal incentives for windpower. This article discusses the limitations of such incentives in supporting farmer- or community-owned wind projects, describes four ownership structures that potentially overcome such limitations, and finally conducts comparative financial analysis on those four structures, using as an example a hypothetical 1.5 MW farmer-owned project located in the state of Oregon. We find that material differences in the competitiveness of each structure do exist, but that choosing the best structure for a given project will largely depend on the conditions at hand; e.g., the ability of the farmer(s) to utilize tax credits, preference for individual versus cooperative ownership, and the state and utility service territory in which the project will be located.

Bolinger, Mark; Wiser, Ryan; Wind, Tom; Juhl, Dan; Grace, Robert; West, Peter

2005-05-20

365

DEVELOPMENT AND ASSESSMENT OF COATINGS FOR FUTURE POWER GENERATION TURBINES  

SciTech Connect

The NETL-Regional University Alliance (RUA) continues to advance technology development critical to turbine manufacturer efforts for achieving DOE Fossil Energy (FE's) Advanced Turbine Program Goals. In conjunction with NETL, Coatings for Industry (CFI), the University of Pittsburgh, NASA GRC, and Corrosion Control Inc., efforts have been focused on development of composite thermal barrier coating (TBC) architectures that consist of an extreme temperature coating, a commercially applied 7-8 YSZ TBC, a reduced cost bond coat, and a diffusion barrier coating that are applied to nickel-based superalloys or single crystal airfoil substrate materials for use at temperatures >1450 C (> 2640 F). Additionally, construction of a unique, high temperature ({approx}1100 C; {approx}2010 F), bench-scale, micro-indentation, nondestructive (NDE) test facility at West Virginia University (WVU) was completed to experimentally address in-situ changes in TBC stiffness during extended cyclic oxidation exposure of coated single crystal coupons in air or steam containing environments. The efforts and technical accomplishments in these areas are presented in the following sections of this paper.

Alvin, Maryanne; Klotz, K.; McMordie, B.; Gleeson, B.; Zhu, D.; Warnes, B.; Kang, B.; Tannenbaum, J.

2012-01-01

366

Developing Information Power Grid Based Algorithms and Software  

NASA Technical Reports Server (NTRS)

This exploratory study initiated our effort to understand performance modeling on parallel systems. The basic goal of performance modeling is to understand and predict the performance of a computer program or set of programs on a computer system. Performance modeling has numerous applications, including evaluation of algorithms, optimization of code implementations, parallel library development, comparison of system architectures, parallel system design, and procurement of new systems. Our work lays the basis for the construction of parallel libraries that allow for the reconstruction of application codes on several distinct architectures so as to assure performance portability. Following our strategy, once the requirements of applications are well understood, one can then construct a library in a layered fashion. The top level of this library will consist of architecture-independent geometric, numerical, and symbolic algorithms that are needed by the sample of applications. These routines should be written in a language that is portable across the targeted architectures.

Dongarra, Jack

1998-01-01

367

Adult development and the transformative powers of psychotherapy.  

PubMed

This article explores the ways in which receiving, providing, and teaching others to do psychotherapy have influenced my adult development. In my 70s, I arrived at the conviction that at every stage of adulthood, practicing psychotherapy has had a direct and causal influence on my efforts to fill my personal life with meaning, virtue, and maturity. The first section of this article focuses on the ways in which learning to be a particular kind of psychoanalytic therapist facilitated my transition into early adulthood. The middle sections describe how I have used the professional practice of psychotherapy to integrate or dissolve the boundaries between work and play, and science and art, in the everyday conduct of my life. My psychobiographical analysis concludes with some reflections on a professional failure and the compensations of being an aging therapist. PMID:24953767

Geller, Jesse D

2014-08-01

368

Recent developments on the Vulcan High Power Laser Facility  

NASA Astrophysics Data System (ADS)

We present details of a refurbishment and development programme that we have undertaken on the Vulcan Nd:Glass laser system to improve delivery to its two target areas. For target area petawatt in addition to replacing the gratings in the compressor chamber we have installed a new diagnostic line for improved pulse length measurement and commissioned a high energy seed system to improve contrast. In target area west we have replaced a grating on the high energy short pulse line and improved the focal spot quality. Both areas have been re-commissioned and their laser parameters measured showing that the pulse in petawatt has been measured below 500fs and focused to a spot size of 4?m the two short pulse beam lines in target area west have been measured as short as 1ps and have been focused to 5?m.

Musgrave, I.; Boyle, A.; Carroll, D.; Clarke, R.; Heathcote, R.; Galimberti, M.; Green, J.; Neely, D.; Notley, M.; Parry, B.; Shaikh, W.; Winstone, T.; Pepler, D.; Kidd, A.; Hernandez-Gomez, C.; Collier, J.

2013-05-01

369

Aluminum-air power cell research and development. Progress report  

SciTech Connect

An aluminum-air battery is under development with the objective of providing an electric vehicle with the range, acceleration and rapid refueling capability of common automobiles. From tested refuelable cell designs, a wedge-shaped cell was chosen for mechanical simplicity and for its capability of full anode utilization and rapid partial- or full-recharge. The cell uses tin-plated copper tracks to maintain a constant interelectrode separation and to collect anodic current. Rectangular slabs of aluminum enter the cell under gravity feed and gradually assume the wedge shape during dissolution. The feed is constant and continuous and tin/aluminum junction losses are 7 mV at 2 kA/m/sup 2/. A second generation wedge cell has been developed which incorporates air- and electrolyte-manifolding into individually-replaceable air-cathode cassettes. A prototype wedge cell using replaceable cassettes was operated simultaneously with a crystallizer, which stabilized aluminate concentration and produced a granular aluminum-trihydroxide reaction product. Electrolyte was circulated between cell and fluidized-bed crystallizer, and particles of sizes greater than 0.015 mm were retained within the crystallizer using a hydrocyclone. Air electrodes have been tested over simulated vehicle drive cycles. Electrodes using advanced sintering and wet-proofing techniques and catalyzed with a non-noble metal catalyst (CoTMPP) have been operated for over 1400 drive-cycles. Fuel costs of $1.72/kg-Al (installed) were estimated on the basis of model alloy production and distribution costs, leading to a projected operating cost of 8-10 cents/mile, depending on alloy and vehicle drive-train efficiencies. Unalloyed aluminum yields a peak of 4.5 kWh/kg, while an advanced industrial Hall Process and the pilot-plant Alcoa Smelting Process have electrical energy consumptions of 11.3- and 8.3 kWh/kg, respectively.

Cooper, J.F.

1984-02-22

370

Development of intermetallic coatings for fusion power applications  

SciTech Connect

In the design of liquid-metal cooling systems, corrosion resistance of structural materials and magnetohydrodynamic (MHD) force and its subsequent influence on thermal hydraulics and corrosion are major concerns. The objective of this study is to develop stable corrosion-resistant electrical insulator coatings at the liquid-metal/structural-material interface, with emphasis on electrically insulating coatings that prevent adverse MHD-generated currents from passing through the structural walls. Vanadium and V-base alloys are potential materials for structural applications in a fusion reactor. Insulator coatings inside the tubing are required when the system is cooled by liquid metals. Various intermetallic films were produced on V, V-t, and V-20 Ti, V-5Cr-t and V-15Cr-t, and Ti, and Types 304 and 316 stainless steel. The intermetallic layers were developed by exposure of the materials to liquid lithium of 3--5 at.% and containing dissolved metallic solutes at temperatures of 416--880{degrees}C. Subsequently, electrical insulator coatings were produced by reaction of the reactive layers with dissolved nitrogen in liquid lithium or by air oxidation under controlled conditions at 600--1000{degrees}C. These reactions converted the intermetallic layers to electrically insulating oxide/nitride or oxy-nitride layers. This coating method could be applied to a commercial product. The liquid metal can be used over and over because only the solutes are consumed within the liquid metal. The technique can be applied to various shapes because the coating is formed by liquid-phase reaction. This paper will discuss initial results on the nature of the coatings and their in-situ electrical resistivity characteristics in liquid lithium at high temperatures.

Park, J.H.; Domenico, T.; Dragel, G.; Clark, R.

1994-03-01

371

Development of REBCO superconducting power transformers in Japan  

NASA Astrophysics Data System (ADS)

In Japan we started a national project to develop a 66/6.9 kV-20 MVA transformer with REBCO superconducting tapes in 2006. This paper gives an overview of progress of the development of superconducting transformers in Japan and also describes the fundamental technologies studied before now to realize a 66/6.9 kV-20 MVA transformer as follows. To reduce the ac loss in REBCO superconducting thin tapes, authors proposed a new method different from the conventional technique of reducing the ac loss in superconducting multifilamentary wires. It consists of scribing process into a multifilamentary structure by laser or chemical etching, and a special winding process. Making a multilayered solenoidal coil with laser-scribed REBCO tapes, we verified the ac loss reduction in proportion to a filament width even in coil configuration. In addition, to realize a current capacity more than the rated secondary current of 2.4 kA, we first investigated the workability of REBCO tapes in the actual winding process with forming a transposed parallel conductor, where REBCO tapes were bent edgewise at transposing points. Making a test coil of a 24-strand parallel conductor, we verified no degradation of the critical current and nearly uniform current distribution among the tapes. The result suggests the applicability of the method of enhancing the current capacity by forming a parallel conductor with REBCO tapes. Further, to realize the dielectric strength regulated for the Japanese standards, i.e. lightning impulse withstand level of 350 kV and excess ac voltage of 140 kV, we made test coils and carried out dielectric breakdown tests. As a result, we got hold of the required insulation distance at the important points from the viewpoint of insulation design.

Iwakuma, M.; Hayashi, H.; Okamoto, H.; Tomioka, A.; Konno, M.; Saito, T.; Iijima, Y.; Suzuki, Y.; Yoshida, S.; Yamada, Y.; Izumi, T.; Shiohara, Y.

2009-10-01

372

Kjernekraft - status og utvikling 1988/1989. (Nuclear power - status and development 1988/1989).  

National Technical Information Service (NTIS)

A review of the present global position of nuclear power is given. The role to play for nuclear energy in strategies for environmentally sustainable development is also dealt with. (Atomindex citation 21:003563)

R. Lingjaerde

1989-01-01

373

40-kW Field Test Power Plant Modification and Development. Phase II.  

National Technical Information Service (NTIS)

Phase II activities conducted between August 1980 and February 1982 on the 40-kW Engineering and Development power plant are reported. Principal activities during this period included incorporation and verification testing of improved components and subsy...

1983-01-01

374

Operation and management of batteries in photovoltaic power systems under development in Japan  

NASA Astrophysics Data System (ADS)

A review is given of the lead/acid battery types being used in photovoltaic power-generating systems under development by NEDO in Japan. These systems find a wide variety of applications in remote areas.

Morishige, Takanori

375

Pre-prototype 5 kW fuel cell power plant development  

NASA Astrophysics Data System (ADS)

A five kilowatt Phosphoric Acid Fuel Cell (PAFC) power plant, with the ability to operate on neat methanol, was developed and tested. Overall thermal efficiency at full load (based on the lower heating value of methanol) was 32 percent.

Abens, Sandors; Farooque, Mohammad

1987-04-01

376

Development of a Power-Spectral Gust Design Procedure for Civil Aircraft.  

National Technical Information Service (NTIS)

Three alternate forms of gust loads criterion based on power-spectral concepts are developed. These include a mission analysis criterion, a design envelope criterion, and a criterion combining advantages of each. The latter is recommended for design use. ...

F. M. Hoblit N. Paul J. D. Shelton F. E. Ashford

1966-01-01

377

Research and Technology Activities Supporting Closed-Brayton-Cycle Power Conversion System Development.  

National Technical Information Service (NTIS)

The elements of Brayton technology development emphasize power conversion system risk mitigation. Risk mitigation is achieved by demonstrating system integration feasibility, subsystem/component life capability (particularly in the context of material cre...

M. J. Barrett

2004-01-01

378

Advanced Technology and Public Policy: The Development of the Nuclear Power Reactor in Six Nations.  

National Technical Information Service (NTIS)

An analysis of how political, social, and economic forces shaped the development of nuclear power in the US, USSR, Great Britain, France, Canada, and West Germany is presented. (ERA citation 05:004506)

P. deLeon

1979-01-01

379

Update on the Development and Testing of a New Long Duration Solar Powered Autonomous Surface Vehicle.  

National Technical Information Service (NTIS)

This paper provides an update on the development and testing of a new long duration solar powered autonomous surface vehicle (ASV) for oceanographic and atmospheric scientific research missions. A fleet of three Ocean Atmosphere Sensor Integration System ...

C. Schirtzinger J. Yungel J. R. Higinbotham J. R. Moisan M. Linkswiler

2008-01-01

380

Development of a New Long Duration Solar Powered Autonomous Surface Vehicle.  

National Technical Information Service (NTIS)

This paper introduces recent activities associated with the development of a new long duration solar powered autonomous surface vehicle (ASV) known as the Ocean Atmosphere Sensor Integration System (OASIS). A brief discussion of ASV applications, platform...

G. Hitchener J. R. Higinbotham J. R. Moisan

2006-01-01

381

Development of Standardized Power Electronic Components, Subsystems, and Systems for Increased Modularity and Scalability.  

National Technical Information Service (NTIS)

Power electronics devices hold substantial promise for making distributed energy applications more efficient and cost effective. This project is motivated towards developing and testing inverters that will allow distributed energy systems to provide ancil...

B. Kroposki C. Pink G. Kern J. Price S. Chakraborty

2007-01-01

382

Pawa Mosfet (150 Watto Kurasu) No Kaihatsu (Development of Power MOSFET (150 W Class)).  

National Technical Information Service (NTIS)

An overview of the power Metal Oxide Semiconductor (MOS) Field Effect Transistor (FET) is presented. Development was being conducted to upgrade radiation resistance without impairing electrical characteristics and to improve chip process design for decrea...

S. Kuboyama T. Tamura M. Uesugi T. Kanno

1992-01-01

383

Public attitude to possibility of the nuclear power engineering development in the Republic of Belarus.  

National Technical Information Service (NTIS)

To estimate the public attitude of the Belarus population to possible ways of overcoming of energy crisis and, in particular, to nuclear power engineering development in the republic, Institute of Sociology, the Belarus Training, Research and Information ...

E. M. Babosov A. M. Grishchenko A. A. Mikhalevich N. M. Grusha A. I. Stavrov

1996-01-01

384

Comparative technology and public policy: The development of the nuclear power reactor in six nations  

Microsoft Academic Search

This essay proposes an analytic framework to compare the development and commercialization of a number of advanced civilian technologies. This framework emphasizes the multiple institutional actors and their objectives that such technology developments manifest and reflect. The construct is then illustrated in the context of the development and diffusion of the nuclear power reactor in six nations. The major policy

Peter DeLeon

1980-01-01

385

Integrating planning and design optimization for thermal power generation in developing economies: Designs for Vietnam  

Microsoft Academic Search

In the twenty first century, global warming and climate change have become environmental issues worldwide. There is a need to reduce greenhouse gas emissions from thermal power plants through improved efficiency. This need is shared by both developed and developing countries. It is particularly important in rapidly developing economies (for example, Vietnam, South Korea, and China) where there is very

John Dinh Chuong Pham

2005-01-01

386

Development and Design Characteristics of the Advanced Power Reactor 1400 (APR1400)  

Microsoft Academic Search

The Advanced Power Reactor 1400 (APR1400) is Korea's newly developed advanced reactor project. It has been developed since 1992 as one of the government's long-term national R and D projects and successfully finished its standard design licensing review in May 2002; it is now ready for actual construction. The APR1400 is an evolutionary-type nuclear power plant of a 1400 MWe

Kye-Hong

2004-01-01

387

Development of software to improve AC power quality on large spacecraft  

NASA Astrophysics Data System (ADS)

To insure the reliability of a 20 kHz, alternating current (AC) power system on spacecraft, it is essential to analyze its behavior under many adverse operating conditions. Some of these conditions include overloads, short circuits, switching surges, and harmonic distortions. Harmonic distortions can become a serious problem. It can cause malfunctions in equipment that the power system is supplying, and, during distortions such as voltage resonance, it can cause equipment and insulation failures due to the extreme peak voltages. To address the harmonic distortion issue, work was begun under the 1990 NASA-ASEE Summer Faculty Fellowship Program. Software, originally developed by EPRI, called HARMFLO, a power flow program capable of analyzing harmonic conditions on three phase, balanced, 60 Hz AC power systems, was modified to analyze single phase, 20 kHz, AC power systems. Since almost all of the equipment used on spacecraft power systems is electrically different from equipment used on terrestrial power systems, it was also necessary to develop mathematical models for the equipment to be used on the spacecraft. The modelling was also started under the same fellowship work period. Details of the modifications and models completed during the 1990 NASA-ASEE Summer Faculty Fellowship Program can be found in a project report. As a continuation of the work to develop a complete package necessary for the full analysis of spacecraft AC power system behavior, deployment work has continued through NASA Grant NAG3-1254. This report details the work covered by the above mentioned grant.

Kraft, L. Alan

1991-12-01

388

High Power MPD Thruster Development at the NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

Propulsion requirements for large platform orbit raising, cargo and piloted planetary missions, and robotic deep space exploration have rekindled interest in the development and deployment of high power electromagnetic thrusters. Magnetoplasmadynamic (MPD) thrusters can effectively process megawatts of power over a broad range of specific impulse values to meet these diverse in-space propulsion requirements. As NASA's lead center for electric propulsion, the Glenn Research Center has established an MW-class pulsed thruster test facility and is refurbishing a high-power steady-state facility to design, build, and test efficient gas-fed MPD thrusters. A complimentary numerical modeling effort based on the robust MACH2 code provides a well-balanced program of numerical analysis and experimental validation leading to improved high power MPD thruster performance. This paper reviews the current and planned experimental facilities and numerical modeling capabilities at the Glenn Research Center and outlines program plans for the development of new, efficient high power MPD thrusters.

LaPointe, Michael R.; Mikellides, Pavlos G.; Reddy, Dhanireddy (Technical Monitor)

2001-01-01

389

Development of Ada language control software for the NASA power management and distribution test bed  

NASA Technical Reports Server (NTRS)

The Ada language software developed to control the NASA Lewis Research Center's Power Management and Distribution testbed is described. The testbed is a reduced-scale prototype of the electric power system to be used on space station Freedom. It is designed to develop and test hardware and software for a 20-kHz power distribution system. The distributed, multiprocessor, testbed control system has an easy-to-use operator interface with an understandable English-text format. A simple interface for algorithm writers that uses the same commands as the operator interface is provided, encouraging interactive exploration of the system.

Wright, Ted; Mackin, Michael; Gantose, Dave

1989-01-01

390

Development and Testing of the Glenn Research Center Visitor's Center Grid-Tied Photovoltaic Power System  

NASA Technical Reports Server (NTRS)

The NASA Glenn Research Center (GRC) has developed, installed, and tested a 12 kW DC grid-tied photovoltaic (PV) power system at the GRC Visitor s Center. This system utilizes a unique ballast type roof mount for installing the photovoltaic panels on the roof of the Visitor s Center with no alterations or penetrations to the roof. The PV system has generated in excess of 15000 kWh since operation commenced in August 2008. The PV system is providing power to the GRC grid for use by all. Operation of the GRC Visitor s Center PV system has been completely trouble free. A grid-tied PV power system is connected directly to the utility distribution grid. Facility power can be obtained from the utility system as normal. The PV system is synchronized with the utility system to provide power for the facility, and excess power is provided to the utility. The project transfers space technology to terrestrial use via nontraditional partners. GRC personnel glean valuable experience with PV power systems that are directly applicable to various space power systems, and provides valuable space program test data. PV power systems help to reduce harmful emissions and reduce the Nation s dependence on fossil fuels. Power generated by the PV system reduces the GRC utility demand, and the surplus power aids the community. Present global energy concerns reinforce the need for the development of alternative energy systems. Modern PV panels are readily available, reliable, efficient, and economical with a life expectancy of at least 25 years. Modern electronics has been the enabling technology behind grid-tied power systems, making them safe, reliable, efficient, and economical with a life expectancy of at least 25 years. Based upon the success of the GRC Visitor s Center PV system, additional PV power system expansion at GRC is under consideration. The GRC Visitor s Center grid-tied PV power system was successfully designed and developed which served to validate the basic principles described, and the theoretical work that was performed. The report concludes that grid-tied photovoltaic power systems are reliable, maintenance free, long life power systems, and are of significant value to NASA and the community.

Eichenberg, Dennis J.

2009-01-01

391

Predicting future wind power generation and power demand in France using statistical downscaling methods developed for hydropower applications  

NASA Astrophysics Data System (ADS)

For many applications in the energy sector, it is crucial to dispose of downscaling methods that enable to conserve space-time dependences at very fine spatial and temporal scales between variables affecting electricity production and consumption. For climate change impact studies, this is an extremely difficult task, particularly as reliable climate information is usually found at regional and monthly scales at best, although many industry oriented applications need further refined information (hydropower production model, wind energy production model, power demand model, power balance model…). Here we thus propose to investigate the question of how to predict and quantify the influence of climate change on climate-related energies and the energy demand. To do so, statistical downscaling methods originally developed for studying climate change impacts on hydrological cycles in France (and which have been used to compute hydropower production in France), have been applied for predicting wind power generation in France and an air temperature indicator commonly used for predicting power demand in France. We show that those methods provide satisfactory results over the recent past and apply this methodology to several climate model runs from the ENSEMBLES project.

Najac, Julien

2014-05-01

392

International and Domestic Development Trends of Electromagnetic Transient Analysis Programs for Power Systems  

NASA Astrophysics Data System (ADS)

Nowadays, there is quite high demand for electromagnetic transient (EMT) analysis programs and real-time simulators for power systems. In addition to the conventional demand such as overvoltage, over-current and oscillation simulations, the new demand that includes simulations of power-electronics circuits and power quality is increasing. With this background, development groups of EMT programs and real-time simulators have made progress in terms of computational performance and user experience. In Japan, Central Research Institute of Electric Power Industry has newly developed an EMT analysis program called XTAP (eXpandable Transient Analysis Program). This article overviews these international and domestic development trends of EMT analysis programs and real-time simulators.

Noda, Taku

393

NASA's PEM Fuel Cell Power Plant Development Program for Space Applications  

NASA Technical Reports Server (NTRS)

A three-center NASA team led by the Glenn Research Center in Cleveland, Ohio is completing a five-year PEM fuel cell power plant development program for future space applications. The focus of the program has been to adapt commercial PEM fuel cell technology for space applications by addressing the key mission requirements of using pure oxygen as an oxidant and operating in a multi-gravity environment. Competing vendors developed breadboard units in the 1 to 5 kW power range during the first phase of the program, and a single vendor developed a nominal 10-kW engineering model power pant during the second phase of the program. Successful performance and environmental tests conducted by NASA established confidence that PEM fuel cell technology will be ready to meet the electrical power needs of future space missions.

Hoberecht, Mark A.

2008-01-01

394

Analysis of critical development issues towards advanced tokamak power plant CREST  

NASA Astrophysics Data System (ADS)

A development scenario of the tokamak reactor in three stages (i.e. the experimental reactor ITER, a demonstration reactor and a commercial reactor) has been recently discussed. In order to construct a feasible development strategy, it is necessary to evaluate which component of reactor technologies and to what extent should be developed. From the viewpoint of the future electric supplier, we have proposed the conceptual design of a commercial power plant, compact reversed shear tokamak (CREST), and a demonstration power plant, Demo-CREST. On the other hand, the project of the experimental reactor ITER is underway, and its experimental plan and R&D activities are almost completed. Hence, it is most important and reasonable to investigate the demonstration power plant on the track of ITER in order to show a specific development scenario of the tokamak reactor. In this report, we discuss the engineering aspect in the Demo-CREST design and analyse the critical development issues towards an advanced tokamak CREST. The power flow and power plant system for Demo-CREST are investigated for improvement in the thermal efficiency of a single device, and the development goals for each reactor component and for each development step are quantitatively analysed.

Hiwatari, R.; Okano, K.; Asaoka, Y.; Ogawa, Y.

2007-05-01

395

Update on Development of SiC Multi-Chip Power Modules  

NASA Technical Reports Server (NTRS)

Progress has been made in a continuing effort to develop multi-chip power modules (SiC MCPMs). This effort at an earlier stage was reported in 'SiC Multi-Chip Power Modules as Power-System Building Blocks' (LEW-18008-1), NASA Tech Briefs, Vol. 31, No. 2 (February 2007), page 28. The following recapitulation of information from the cited prior article is prerequisite to a meaningful summary of the progress made since then: 1) SiC MCPMs are, more specifically, electronic power-supply modules containing multiple silicon carbide power integrated-circuit chips and silicon-on-insulator (SOI) control integrated-circuit chips. SiC MCPMs are being developed as building blocks of advanced expandable, reconfigurable, fault-tolerant power-supply systems. Exploiting the ability of SiC semiconductor devices to operate at temperatures, breakdown voltages, and current densities significantly greater than those of conventional Si devices, the designs of SiC MCPMs and of systems comprising multiple SiC MCPMs are expected to afford a greater degree of miniaturization through stacking of modules with reduced requirements for heat sinking; 2) The stacked SiC MCPMs in a given system can be electrically connected in series, parallel, or a series/parallel combination to increase the overall power-handling capability of the system. In addition to power connections, the modules have communication connections. The SOI controllers in the modules communicate with each other as nodes of a decentralized control network, in which no single controller exerts overall command of the system. Control functions effected via the network include synchronization of switching of power devices and rapid reconfiguration of power connections to enable the power system to continue to supply power to a load in the event of failure of one of the modules; and, 3) In addition to serving as building blocks of reliable power-supply systems, SiC MCPMs could be augmented with external control circuitry to make them perform additional power-handling functions as needed for specific applications. Because identical SiC MCPM building blocks could be utilized in such a variety of ways, the cost and difficulty of designing new, highly reliable power systems would be reduced considerably. This concludes the information from the cited prior article. The main activity since the previously reported stage of development was the design, fabrication, and testing a 120- VDC-to-28-VDC modular power-converter system composed of eight SiC MCPMs in a 4 (parallel)-by-2 (series) matrix configuration, with normally-off controllable power switches. The SiC MCPM power modules include closed-loop control subsystems and are capable of operating at high power density or high temperature. The system was tested under various configurations, load conditions, load-transient conditions, and failure-recovery conditions. Planned future work includes refinement of the demonstrated modular system concept and development of a new converter hardware topology that would enable sharing of currents without the need for communication among modules. Toward these ends, it is also planned to develop a new converter control algorithm that would provide for improved sharing of current and power under all conditions, and to implement advanced packaging concepts that would enable operation at higher power density.

Lostetter, Alexander; Cilio, Edgar; Mitchell, Gavin; Schupbach, Roberto

2008-01-01

396

A probabilistic assessment of large scale wind power development for long-term energy resource planning  

NASA Astrophysics Data System (ADS)

A steady decline in the cost of wind turbines and increased experience in their successful operation have brought this technology to the forefront of viable alternatives for large-scale power generation. Methodologies for understanding the costs and benefits of large-scale wind power development, however, are currently limited. In this thesis, a new and widely applicable technique for estimating the social benefit of large-scale wind power production is presented. The social benefit is based upon wind power's energy and capacity services and the avoidance of environmental damages. The approach uses probabilistic modeling techniques to account for the stochastic interaction between wind power availability, electricity demand, and conventional generator dispatch. A method for including the spatial smoothing effect of geographically dispersed wind farms is also introduced. The model has been used to analyze potential offshore wind power development to the south of Long Island, NY. If natural gas combined cycle (NGCC) and integrated gasifier combined cycle (IGCC) are the alternative generation sources, wind power exhibits a negative social benefit due to its high capacity cost and the relatively low emissions of these advanced fossil-fuel technologies. Environmental benefits increase significantly if charges for CO2 emissions are included. Results also reveal a diminishing social benefit as wind power penetration increases. The dependence of wind power benefits on natural gas and coal prices is also discussed. In power systems with a high penetration of wind generated electricity, the intermittent availability of wind power may influence hourly spot prices. A price responsive electricity demand model is introduced that shows a small increase in wind power value when consumers react to hourly spot prices. The effectiveness of this mechanism depends heavily on estimates of the own- and cross-price elasticities of aggregate electricity demand. This work makes a valuable contribution by synthesizing information from research in power market economics, power system reliability, and environmental impact assessment, to develop a comprehensive methodology for analyzing wind power in the context of long-term energy planning.

Kennedy, Scott Warren

397

Design of isolated renewable hybrid power systems  

SciTech Connect

Isolated electrical power generating units can be used as an economically viable alternative to electrify remote villages where grid extension is not feasible. One of the options for building isolated power systems is by hybridizing renewable power sources like wind, solar, micro-hydro, etc. along with appropriate energy storage. A method to optimally size and to evaluate the cost of energy produced by a renewable hybrid system is proposed in this paper. The proposed method, which is based on the design space approach, can be used to determine the conditions for which hybridization of the system is cost effective. The simple and novel methodology, proposed in this paper, is based on the principles of process integration. It finds the minimum battery capacity when the availability and ratings of various renewable resources as well as load demand are known. The battery sizing methodology is used to determine the sizing curve and thereby the feasible design space for the entire system. Chance constrained programming approach is used to account for the stochastic nature of the renewable energy resources and to arrive at the design space. The optimal system configuration in the entire design space is selected based on the lowest cost of energy, subject to a specified reliability criterion. The effects of variation of the specified system reliability and the coefficient of correlation between renewable sources on the design space, as well as the optimum configuration are also studied in this paper. The proposed method is demonstrated by designing an isolated power system for an Indian village utilizing wind-solar photovoltaic-battery system. (author)

Sreeraj, E.S.; Chatterjee, Kishore [Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai 400 076 (India); Bandyopadhyay, Santanu [Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400 076 (India)

2010-07-15

398

Innovation on Energy Power Technology (22)Challenge to Development of Expert System stored Knowledge of Expert Power Network Operators  

NASA Astrophysics Data System (ADS)

Do you remember an expert system? I think there are various impressions about the system. For example, some might say “It reminds me of old days”. On the other hand, some might say “It was really troublesome”. About 25 years ago, from late 1980s to the middle of 1990s, when the Showa era was about to change into the Heisei Era, artificial intelligence boomed. Research and development for an expert system which was equipped with expertise and worked as smart as expert, was advanced in various fields. Our company also picked up the system as the new system which covered weak point of conventional computer technology. We started research and development in 1984, and installed an expert system in a SCADA system, which started operating in March 1990 in the Fukuoka Integrated Control Center. In this essay, as an electric power engineer who involved in development at that time, I introduce the situation and travail story about developing an expert system which support restorative actions from the outage and overload condition of power networks.

Sakaguchi, Hideharu

399

The alternative strategies of the development of the nuclear power industry in the 21st century  

NASA Astrophysics Data System (ADS)

This paper emphasizes the urgency of scientific-and-technical and sociopolitical problems of the modern nuclear power industry without solving of which the transition from local nuclear power systems now in operation to a large-scale nuclear power industry would be impossible. The existing concepts of the longterm strategy of the development of the nuclear power industry have been analyzed. On the basis of the scenarios having been developed it was shown that the most promising alternative is the orientation towards the closed nuclear fuel cycle with fast neutron reactors (hereinafter referred to as fast reactors) that would meet the requirements on the acceptable safety. It was concluded that the main provisions of "The Strategy of the Development of the Nuclear Power Industry of Russia for the First Half of the 21st Century" approved by the Government of the Russian Federation in the year 2000 remain the same at present as well, although they require to be elaborated with due regard for new realities in the market for fossil fuels, the state of both the Russian and the world economy, as well as tightening of requirements related to safe operation of nuclear power stations (NPSs) (for example, after the severe accident at the Fukushima nuclear power station, Japan) and nonproliferation of nuclear weapons.

Goverdovskii, A. A.; Kalyakin, S. G.; Rachkov, V. I.

2014-05-01

400

Development of Lithium-ion Battery as Energy Storage for Mobile Power Sources Applications  

NASA Astrophysics Data System (ADS)

In view of the need to protect the global environment and save energy, there has been strong demand for the development of lithium-ion battery technology as a energy storage system, especially for Light Electric Vehicle (LEV) and electric vehicles (EV) applications. The R&D trend in the lithium-ion battery development is toward the high power and energy density, cheaper in price and high safety standard. In our laboratory, the research and development of lithium-ion battery technology was mainly focus to develop high power density performance of cathode material, which is focusing to the Li-metal-oxide system, LiMO2, where M=Co, Ni, Mn and its combination. The nano particle size material, which has irregular particle shape and high specific surface area was successfully synthesized by self propagating combustion technique. As a result the energy density and power density of the synthesized materials are significantly improved. In addition, we also developed variety of sizes of lithium-ion battery prototype, including (i) small size for electronic gadgets such as mobile phone and PDA applications, (ii) medium size for remote control toys and power tools applications and (iii) battery module for high power application such as electric bicycle and electric scooter applications. The detail performance of R&D in advanced materials and prototype development in AMREC, SIRIM Berhad will be discussed in this paper.

Sulaiman, Mohd Ali; Hasan, Hasimah

2009-09-01

401

Assessment of the technology required to develop photovoltaic power system for large scale national energy applications  

NASA Technical Reports Server (NTRS)

A technical assessment of a program to develop photovoltaic power system technology for large-scale national energy applications was made by analyzing and judging the alternative candidate photovoltaic systems and development tasks. A program plan was constructed based on achieving the 10 year objective of a program to establish the practicability of large-scale terrestrial power installations using photovoltaic conversion arrays costing less than $0.50/peak W. Guidelines for the tasks of a 5 year program were derived from a set of 5 year objectives deduced from the 10 year objective. This report indicates the need for an early emphasis on the development of the single-crystal Si photovoltaic system for commercial utilization; a production goal of 5 x 10 to the 8th power peak W/year of $0.50 cells was projected for the year 1985. The developments of other photovoltaic conversion systems were assigned to longer range development roles. The status of the technology developments and the applicability of solar arrays in particular power installations, ranging from houses to central power plants, was scheduled to be verified in a series of demonstration projects. The budget recommended for the first 5 year phase of the program is $268.5M.

Lutwack, R.

1974-01-01

402

The Study of Information System Development (ISD) Process from the Perspectives of Power Development Stage and Organizational Politics  

Microsoft Academic Search

Abstract This paper ,is to ,study ,the information ,system development,(ISD) by looking ,into fifty-six cases from the perspectives ,of power ,development ,stage ,and organizational politics. We intend ,to find out why the ISD will be a ,success or a ,failure. In this research we sort out 192 examples of political games from 56 cases, which can be categorized into forty-one

Ling-hsing Chang; Tung-ching Lin; Sheng Wu

2002-01-01

403

Development of gallium arsenide high-speed, low-power serial parallel interface modules: Executive summary  

NASA Technical Reports Server (NTRS)

Final report to NASA LeRC on the development of gallium arsenide (GaAS) high-speed, low power serial/parallel interface modules. The report discusses the development and test of a family of 16, 32 and 64 bit parallel to serial and serial to parallel integrated circuits using a self aligned gate MESFET technology developed at the Honeywell Sensors and Signal Processing Laboratory. Lab testing demonstrated 1.3 GHz clock rates at a power of 300 mW. This work was accomplished under contract number NAS3-24676.

1988-01-01

404

Development of long life three phase uninterruptible power supply using flywheel energy storage unit  

Microsoft Academic Search

According to the development of computer applications, uninterruptible power supplies (UPS) are indispensable to the industrial field. But the cost of maintaining a conventional UPS is very high, because frequent replacement of parts which have short lifetime is necessary. This paper describes the research and development of a new UPS which has long life parts for maintenance free operation. To

Isao Takahashi; Yoshihisa Okita; Itaru Andoh

1996-01-01

405

Assessment of the Components of the Kalimantan and Sulawesi Power Development Project. Volume 1.  

National Technical Information Service (NTIS)

This report, conducted by Utility Consulting was funded by the U.S. Trade and Development Agency. The report concerns a power development project on the islands of Kalimantan and Sulawesi. This is TDA Volume II, the main text (Report Volume I), and it inc...

1998-01-01

406

Initial development of a solid-state fault current limiter for naval power systems protection  

Microsoft Academic Search

For the protection of electric ship distribution systems, it is desired that a system be developed which can limit fault currents to reasonable values and which can act more quickly, more reliably, and with a smaller form factor than conventional approaches. Arkansas power electronics International, Inc. (APEI) is currently collaborating with researchers at the University of Arkansas (UA) to develop

Jack Bourne; Marcelo Schupbach; Joe Carr; H. Alan Mantooth; Juan Balda

2009-01-01

407

Development of an Electrical Power Quality Monitor based on a PC  

Microsoft Academic Search

This paper describes an electric power quality monitor developed at the University of Minho. The hardware of the monitor is constituted by four current sensors based on Rogowski effect, four voltage sensors based on Hall effect, a signal conditioning board and a computer. The software of the monitor consists of several applications, and it is based on LabVIEW. The developed

Renato Alves; D. Goncalves; J. G. Pinto; José Batista; João L. Afonso

2009-01-01

408

Development of Fly Ash Derived Sorbents to Capture CO2 from Flue Gas of Power Plants  

Microsoft Academic Search

This research program focused on the development of fly ash derived sorbents to capture CO from power plant flue gas emissions. The fly ash derived sorbents developed represent an affordable alternative to existing methods using specialized activated carbons and molecular sieves, that tend to be very expensive and hinder the viability of the CO sorption process due to economic constraints.

M. Mercedes Maroto-Valer; John M. Andresen; Yinzhi Zhang; Zhe Lu

2003-01-01

409

Solar Power Generation for ICT and Sustainable Development in Emerging Economies  

ERIC Educational Resources Information Center

Purpose: The purpose of this paper is to systematically examine and draw attention to the potential benefits of solar power generation for access to and use of information and communication technologies (ICT) aimed at sustainable development in emerging economies. Design/methodology/approach: Electricity plays a crucial role in the development and…

Paul, Damasen I.; Uhomoibhi, James

2012-01-01

410

Development of Optical Fiber Current Transformer for DC Railway Power System  

Microsoft Academic Search

A novel DC current transformer (CT) based on the Faraday Effect has developed for DC railway power system. The advantages of the developed optical fiber CT are simple and light structure, easiness to handle and robustness to the external magnetic field caused by the adjacent electric current. The basic characteristics of the optical fiber CT are confirmed and compared with

Hitoshi Hayashiya; Tatsuya Kumagai; Takeshi Endo; Shinichi Hase; Masataka Akagi; Masami Hino

2006-01-01

411

Development of a ceramic receiver for a Brayton cycle solar electric power plant  

Microsoft Academic Search

The successful development of a high temperature open air Brayton cycle system depends upon the development of a ceramic receiver (heat exchanger) in which air at 9-10 atmospheres can be heated to 1000 C. A program to design a solar electric power system utilizing an open air Brayton cycle turbine is described. The heat exchanger consists of silicon carbide tubes

J.-D. Walton; J.-N. Harris

1977-01-01

412

Identification of the Electrical Power System development for creating a control model as artificial genetic code  

Microsoft Academic Search

The paper contains a new concept and some research results as regards creating initial population for systematical evolutionary algorithms (SEA). First, different models of development of electrical power system (EPS) obtained a result of identification such as matrix th and model in state space ss, and model in the form artificial genetic code such as a specific information development model

Jerzy R. Tchorzewski

2009-01-01

413

ASME development of risk-based inspection guidelines for nuclear power plants  

Microsoft Academic Search

A methodology has been developed for use in preparing guidelines for the in-service inspection of nuclear power plant pressure boundary and structural components. This methodology is a further development of a general methodology previously published by the task force for application to any industry. It is unique in that it utilizes probabilistic risk assessment (PRA) information to improve the quantification

B. F. Gore; K. R. Balkey

1992-01-01

414

Development of an extreme temperature range silicon carbide power module for aerospace applications  

Microsoft Academic Search

A silicon carbide semiconductor power module is developed for operation at wide temperature extremes. The development of a device substrate, die-attach, interconnect system, and module DC interface is presented in this paper. Electrical and mechanical components of the package are tested and chosen for the best combination to work together as a system. This allows the package to withstand thermal

Dimosthenis C. Katsis; Yunqi Zheng

2008-01-01

415

Development of LNG-Powered Heavy-Duty Trucks in Commercial Hauling  

SciTech Connect

In support of the U.S. Department of Energy's development, deployment, and evaluation of alternative fuels, NREL and the Trucking Research Institute contracted with Detroit Diesel Corporation (DDC) to develop and operate a liquid natural gas fueled tractor powered by a DDC Series 50 prototype natural gas engine. This is the final report on the project.

Detroit Diesel Corporation; Trucking Research Institute

1998-12-03

416

Development of General-Purpose Software to Analyze the Static Thermal Characteristic of Nuclear Power Plant  

NASA Astrophysics Data System (ADS)

We have developed the general-purpose software by which static thermal characteristic of the power generation system is analyzed easily. This software has the notable features as follows. -It has the new algorithm to solve non-linear simultaneous equations to analyze the static thermal characteristics such as heat and mass balance, efficiencies, etc. of various power generation systems. -It has the flexibility for setting calculation conditions. -It is able to be executed on the personal computer easily and quickly. We ensured that it is able to construct heat and mass balance diagrams of main steam system of nuclear power plant and calculate the power output and efficiencies of the system. Furthermore, we evaluated various heat recovery measures of steam generator blowdown water and found that this software could be a useful operation aid for planning effective changes in support of power stretch.

Nakao, Yoshinobu; Koda, Eiichi; Takahashi, Toru

417

Overview of NASA's Space Solar Power Technology Advanced Research and Development Program  

NASA Technical Reports Server (NTRS)

Large solar power satellite (SPS) systems that might provide base load power into terrestrial markets were examined extensively in the 1970s by the US Department of Energy (DOE) and the National Aeronautics and Space Administration (NASA). Following a hiatus of about 15 years, the subject of space solar power (SSP) was reexamined by NASA from 1995-1997 in the 'fresh look' study, and during 1998 in an SSP 'concept definition study', and during 1999-2000 in the SSP Exploratory Research and Technology (SERT) program. As a result of these efforts, during 2001, NASA has initiated the SSP Technology Advanced Research and Development (STAR-Dev) program based on informed decisions. The goal of the STAR-Dev program is to conduct preliminary strategic technology research and development to enable large, multi-megawatt to gigawatt-class space solar power (SSP) systems and wireless power transmission (WPT) for government missions and commercial markets (in-space and terrestrial). Specific objectives include: (1) Release a NASA Research Announcement (NRA) for SSP Projects; (2) Conduct systems studies; (3) Develop Component Technologies; (4) Develop Ground and Flight demonstration systems; and (5) Assess and/or Initiate Partnerships. Accomplishing these objectives will allow informed future decisions regarding further SSP and related research and development investments by both NASA management and prospective external partners. In particular, accomplishing these objectives will also guide further definition of SSP and related technology roadmaps including performance objectives, resources and schedules; including 'multi-purpose' applications (commercial, science, and other government).

Howell, Joe; Mankins, John C.; Davis, N. Jan (Technical Monitor)

2001-01-01

418

Development of Analytical Algorithm for the Performance Analysis of Power Train System of an Electric Vehicle  

NASA Astrophysics Data System (ADS)

Power train system design is one of the key R&D areas on the development process of new automobile because an optimum size of engine with adaptable power transmission which can accomplish the design requirement of new vehicle can be obtained through the system design. Especially, for the electric vehicle design, very reliable design algorithm of a power train system is required for the energy efficiency. In this study, an analytical simulation algorithm is developed to estimate driving performance of a designed power train system of an electric. The principal theory of the simulation algorithm is conservation of energy with several analytical and experimental data such as rolling resistance, aerodynamic drag, mechanical efficiency of power transmission etc. From the analytical calculation results, running resistance of a designed vehicle is obtained with the change of operating condition of the vehicle such as inclined angle of road and vehicle speed. Tractive performance of the model vehicle with a given power train system is also calculated at each gear ratio of transmission. Through analysis of these two calculation results: running resistance and tractive performance, the driving performance of a designed electric vehicle is estimated and it will be used to evaluate the adaptability of the designed power train system on the vehicle.

Kim, Chul-Ho; Lee, Kee-Man; Lee, Sang-Heon

419

Development Status of the NASA 30-cm Ion Thruster and Power Processor  

NASA Technical Reports Server (NTRS)

Xenon ion propulsion systems are being developed by NASA Lewis Research Center and the Jet Propulsion Laboratory to provide flight qualification and validation for planetary and earth-orbital missions. In the ground-test element of this program, light-weight (less than 7 kg), 30 cm diameter ion thrusters have been fabricated, and preliminary design verification tests have been conducted. At 2.3 kW, the thrust, specific impulse, and efficiency were 91 mN, 3300 s, and 0.65, respectively. An engineering model thruster is now undergoing a 2000 h wear-test. A breadboard power processor is being developed to operate from an 80 V to 120 V power bus with inverter switching frequencies of 50 kHz. The power processor design is a pathfinder and uses only three power supplies. The projected specific mass of a flight unit is about 5 kg/kW with an efficiency of 0.92 at the full-power of 2.5 kW. Preliminary integration tests of the neutralizer power supply and the ion thruster have been completed. Fabrication and test of the discharge and beam/accelerator power stages are underway.

Sovey, James S.; Haag, Thomas W.; Hamley, John A.; Mantenieks, Maris A.; Patterson, Michael J.; Pinero, Luis R.; Rawlin, Vincent K.; Kussmaul, Michael T.; Manzella, David H.; Myers, Roger M.

1994-01-01

420

Development of CAPE-OPEN unit operations for advanced power systems modeling  

Microsoft Academic Search

Reaction Engineering International (REI) is developing a suite of CORBA CAPE-OPEN compliant unit operations to support the Department of Energy NETL Advanced Process Engineering Co-Simulation (APECS) framework for advanced power systems. One of these components will provide an interface to the GateCycle software, which is widely used in the power generation industry for process modeling. Additional CAPE-OPEN components will provide

D. Swensen; S. Zitney; M. Bockelie

2007-01-01

421

Development and Application of Laser Peening System for PWR Power Plants  

Microsoft Academic Search

Laser peening is a process to improve residual stress from tensile to compressive in surface layer of materials by irradiating high-power laser pulses on the material in water. Toshiba has developed a laser peening system composed of Q-switched Nd:YAG laser oscillators, laser delivery equipment and underwater remote handling equipment. We have applied the system for Japanese operating BWR power plants

Masaki Yoda; Itaru Chida; Satoshi Okada; Makoto Ochiai; Yuji Sano; Naruhiko Mukai; Gaku Komotori; Ryoichi Saeki; Toshimitsu Takagi; Masanori Sugihara; Hirokata Yoriki

2006-01-01

422

Paths for the development of fast power reactors with a high breeding factor  

Microsoft Academic Search

The assurance of nuclear power generation being developed with fuel resources over a long time is possible with the presence of fast breeder reactors in the system. Estimates show that for the necessary rate of growth of this multicomponent nuclear power generation, fast reactors are required with high breeding factors (BF ~1.6; T2 ~7-9 yrs). The construction of these reactors

S. B. Bobrov; A. V. Danilychev; V. A. Eliseev; O. A. Zhukova; Yu. A. Zverkov; V. G. Ilyunin; V. P. Matveev; A. G. Morozov; V. M. Myrogov; A. I. Novozhilov; V. V. Orlov; I. S. Slesarev; S. A. Subbotin; M. F. Troyanov; B. F. Shafrygin

1983-01-01

423

Development of a microcontroller-based, photovoltaic maximum power point tracking control system  

Microsoft Academic Search

Maximum power point tracking (MPPT) is used in photovoltaic (PV) systems to maximize the photovoltaic array output power, irrespective of the temperature and irradiation conditions and of the load electrical characteristics. A new MPPT system has been developed, consisting of a buck-type DC\\/DC converter, which is controlled by a microcontroller-based unit. The main difference between the method used in the

Eftichios Koutroulis; Kostas Kalaitzakis; Nicholas C. Voulgaris

2001-01-01

424

Development of a homopolar electrical machine for high power density high speed applications  

Microsoft Academic Search

The high speed homopolar machine (HSHM) is investigated as a conceptual high speed electrical machine in pursuit of higher power-densities within a rated power range of up to 100 kW and speeds of up to 100000 rpm. The HSHM's topology is complex and essentially a 3D task. However, a simplified dimensioning methodology is developed and implemented for the investigation. Feasible

J. A. N. Msekela; P. N. Materu; A. H. Nzali

1996-01-01

425

Development and test of a four-module 1200 kVA distributed generation power plant  

Microsoft Academic Search

MTechnology, Inc., was retained to design and develop the power electronics system for a distributed generation power plant. The plant incorporated four 250 kW DC modules. The plant was required to operate both in grid-connect and grid-independent modes, with constraints upon the acceptable transients applied to the plant internal bus during transitions between modes. The transition from grid-connect to grid-independent

S. Fairfax; N. Dowling; David Nichols

2010-01-01

426

Development of a microprocessor controller for stand-alone photovoltaic power systems  

NASA Technical Reports Server (NTRS)

A controller for stand-alone photovoltaic systems has been developed using a low power CMOS microprocessor. It performs battery state of charge estimation, array control, load management, instrumentation, automatic testing, and communications functions. Array control options are sequential subarray switching and maximum power control. A calculator keypad and LCD display provides manual control, fault diagnosis and digital multimeter functions. An RS-232 port provides data logging or remote control capability. A prototype 5 kW unit has been built and tested successfully. The controller is expected to be useful in village photovoltaic power systems, large solar water pumping installations, and other battery management applications.

Millner, A. R.; Kaufman, D. L.

1984-01-01

427

Development of software to improve AC power quality on large spacecraft  

NASA Technical Reports Server (NTRS)

To insure the reliability of a 20 kHz, AC power system on spacecraft, it is essential to analyze its behavior under many adverse operating conditions. Some of these conditions include overloads, short circuits, switching surges, and harmonic distortions. Harmonic distortions can cause malfunctions in equipment that the power system is supplying, and during extreme distortions such as voltage resonance, it can cause equipment and insulation failures due to the extreme peak voltages. HARMFLO, a power flow computer program, which was capable of analyzing harmonic conditions on three phase, balanced, 60 Hz, AC power systems, was modified to analyze single phase, 20 kHz, AC power systems. Since almost all of the equipment used on spacecraft power systems is electrically different from equipment used on terrestrial power systems, it was also necessary to develop mathematical models for the equipment to be used on the spacecraft. The results are that (1) the harmonic power now has a model of a single phase, voltage controlled, full wave rectifier; and (2) HARMFLO was ported to the SUN workstation platform.

Kraft, L. Alan

1991-01-01

428

Progress in High Power Density SOFC Material Development for Aerospace Applications  

NASA Technical Reports Server (NTRS)

Solid oxide fuel cell (SOFC) systems for aircraft applications require order of magnitude increase in specific power density and long life under aircraft operating conditions. Advanced SOFC materials and fabrication processes are being developed at NASA GRC to increase specific power density and durability of SOFC cell and stack. Initial research efforts for increasing specific power density are directed toward increasing the operating temperature for the SOFC system and reducing the weight of the stack. While significant research is underway to develop anode supported SOFC system operating at temperatures in the range of 650 - 850 C for ground power generation applications, such temperatures may not yield the power densities required for aircraft applications. For electrode-supported cells, SOFC stacks with power densities greater than 1.0 W/sq cm are favorable at temperatures in excess of 900 C. The performance of various commercial and developmental anode supported cells is currently being evaluated in the temperature range of 900 to 1000 C to assess the performance gains and materials reliability. The results from these studies will be presented. Since metal interconnects developed for lower temperature operation are not practical at these high temperatures, advanced perovskite based ceramic interconnects with high electronic conductivity and lower sintering temperatures are being developed. Another option for increasing specific power density of SOFC stacks is to decrease the stack weight. Since the interconnect contributes to a significant portion of the stack weight, considerable weight benefits can be derived by decreasing its thickness. Eliminating the gas channels in the interconnect by engineering the pore structure in both anode and cathode can offer significant reduction in thickness of the ceramic interconnect material. New solid oxide fuel cells are being developed with porous engineered electrode supported structures with a 10 - 20 micron thin electrolyte. The performance data for advanced SOFC cells with engineered porosity in both electrodes will be presented.

Cable, Thomas L.; Sofie, Stephen W.; Setlock, John A.; Misra, Ajay K.

2004-01-01

429

Development of Ka-band 250 W peak power helix TWT  

Microsoft Academic Search

Summary form only given. This paper describes the development of a Ka-band 250 W peak power helix traveling wave tube (TWT) for the gateway terminal of the next-generation Internet satellite communication system. NEC started the development of Ka-band microwave tubes for Japanese CS satellite programs in the early 1970's. Since then, the Ka-band microwave tubes development efforts has been carried

T. Machida; T. Kanamoto; H. Fukui; K. Tsutaki

2002-01-01

430

Development of an inspection robot for 500 kV EHV power transmission lines  

Microsoft Academic Search

The developments in mobile robotics have increasingly played an important role in the inspection and maintenance work of Power Transmission Lines (PTLs). This paper presents the research and development of the inspection robots for 500kV PTLs in Shenyang Institute of Automation, Chinese Academy of Sciences (SIACAS). An overview of the research work and the development of an inspection robot AApe-B,

Hongguang Wang; Fei Zhang; Yong Jiang; Guangjun Liu; Xiaojie Peng

2010-01-01

431

Analysis and development of fourth order LCLC resonant based capacitor charging power supply for pulse power applications.  

PubMed

A fourth order (LCLC) resonant converter based capacitor charging power supply (CCPS) is designed and developed for pulse power applications. Resonant converters are preferred t utilize soft switching techniques such as zero current switching (ZCS) and zero voltage switching (ZVS). An attempt has been made to overcome the disadvantages in 2nd and 3rd resonant converter topologies; hence a fourth order resonant topology is used in this paper for CCPS application. In this paper a novel fourth order LCLC based resonant converter has been explored and mathematical analysis carried out to calculate load independent constant current. This topology provides load independent constant current at switching frequency (fs) equal to resonant frequency (fr). By changing switching condition (on time and dead time) this topology has both soft switching techniques such as ZCS and ZVS for better switching action to improve the converter efficiency. This novel technique has special features such as low peak current through switches, DC blocking for transformer, utilizing transformer leakage inductance as resonant component. A prototype has been developed and tested successfully to charge a 100 ?F capacitor to 200 V. PMID:24007087

Naresh, P; Hitesh, C; Patel, A; Kolge, T; Sharma, Archana; Mittal, K C

2013-08-01

432

Analysis and development of fourth order LCLC resonant based capacitor charging power supply for pulse power applications  

NASA Astrophysics Data System (ADS)

A fourth order (LCLC) resonant converter based capacitor charging power supply (CCPS) is designed and developed for pulse power applications. Resonant converters are preferred t utilize soft switching techniques such as zero current switching (ZCS) and zero voltage switching (ZVS). An attempt has been made to overcome the disadvantages in 2nd and 3rd resonant converter topologies; hence a fourth order resonant topology is used in this paper for CCPS application. In this paper a novel fourth order LCLC based resonant converter has been explored and mathematical analysis carried out to calculate load independent constant current. This topology provides load independent constant current at switching frequency (fs) equal to resonant frequency (fr). By changing switching condition (on time and dead time) this topology has both soft switching techniques such as ZCS and ZVS for better switching action to improve the converter efficiency. This novel technique has special features such as low peak current through switches, DC blocking for transformer, utilizing transformer leakage inductance as resonant component. A prototype has been developed and tested successfully to charge a 100 ?F capacitor to 200 V.

Naresh, P.; Hitesh, C.; Patel, A.; Kolge, T.; Sharma, Archana; Mittal, K. C.

2013-08-01

433

High-Power Hall Propulsion Development at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

The NASA Office of the Chief Technologist Game Changing Division is sponsoring the development and testing of enabling technologies to achieve efficient and reliable human space exploration. High-power solar electric propulsion has been proposed by NASA's Human Exploration Framework Team as an option to achieve these ambitious missions to near Earth objects. NASA Glenn Research Center (NASA Glenn) is leading the development of mission concepts for a solar electric propulsion Technical Demonstration Mission. The mission concepts are highlighted in this paper but are detailed in a companion paper. There are also multiple projects that are developing technologies to support a demonstration mission and are also extensible to NASA's goals of human space exploration. Specifically, the In-Space Propulsion technology development project at NASA Glenn has a number of tasks related to high-power Hall thrusters including performance evaluation of existing Hall thrusters; performing detailed internal discharge chamber, near-field, and far-field plasma measurements; performing detailed physics-based modeling with the NASA Jet Propulsion Laboratory's Hall2De code; performing thermal and structural modeling; and developing high-power efficient discharge modules for power processing. This paper summarizes the various technology development tasks and progress made to date

Kamhawi, Hani; Manzella, David H.; Smith, Timothy D.; Schmidt, George R.

2014-01-01

434

Development of a full-scale training simulator for an 800-MW power unit  

NASA Astrophysics Data System (ADS)

Stages of work involving preparation of requirements specification, development, and subsequent implementation of a project for constructing a full-scale training simulator of an 800-MW power unit are considered. The training simulator is constructed using the Kosmotronika-Venets computerized automation system developed by PIK Progress (Moscow). The entire personnel training system, the arrangement of drills, and the concept of structuring the entire personnel education system at the Surgut GRES-2 district power station, a branch of E.ON Rossiya, had to be touched in drawing up the requirements specification for elaborating the training simulator. The article describes how these problems were solved.

Zhuravlev, S. K.; Andreev, A. M.

2013-07-01

435

Space power system design and development from an economic point of view  

NASA Technical Reports Server (NTRS)

The concept of a satellite solar power system offers a feasible, but unproven, long-range energy alternative. While the basic physics of these systems is understood, many developments are necessary in order to reduce the system cost to the point of being cost-competitive with alternative energy sources. Thus, a substantial technology advancement and verification program, plus test and demonstration satellite programs are necessary before a full-scale satellite can be designed and built. It is important to properly identify those elements of the technology that should be subject to development efforts, the goals of the corresponding development programs and the appropriate funding levels and schedules. Systems studies and designs play a major role in rationally formulating a development program. This paper uses an economic approach to place these studies into a framework for formulating a viable satellite solar power system development plan.

Hazelrigg, G. A., Jr.

1977-01-01

436

Fission Surface Power Technology Development Testing at NASA's Early Flight Fission Test Facility  

NASA Technical Reports Server (NTRS)

Fission surface power (FSP) systems could be used to provide power anytime, anywhere on the surface of the Moon or Mars. FSP systems could be used at polar locations, at locations away from the poles, or in permanently shaded regions, with excellent performance at all sites. A potential reference 40 kWe option has been devised that is cost-competitive with alternatives while providing more power for less mass anywhere on the lunar surface. The reference FSP system (FSPS) is also readily extensible for use on Mars. At Mars the system would be capable of operating through global dust storms and providing year-round power at any Martian latitude. Under the NASA Exploration Technology Development Program (ETDP), NASA and the Department of Energy (DOE) have begun technology development on Fission Surface Power (FSP). The primary customer for this technology is the NASA Constellation Program which is responsible for the development of surface systems to support human exploration on the moon and Mars. The objectives of the FSP technology project are: 1) Develop FSP concepts that meet expected surface power requirements at reasonable cost with added benefits over other options. 2) Establish a hardware-based technical foundation for FSP design concepts and reduce overall development risk. 3) Reduce the cost uncertainties for FSP and establish greater credibility for flight system cost estimates. 4) Generate the key products to allow Agency decision-makers to consider FSP as a viable option for flight development. To be mass efficient, FSP systems must operate at higher coolant temperatures and use different types of power conversion than typical terrestrial systems. The primary reason is the difficulty in rejecting excess heat to space. Although many options exist, NASA s current reference FSP system uses a fast spectrum, pumped-NaK cooled reactor coupled to a Stirling power conversion subsystem. The reference system uses technology with significant terrestrial heritage while still providing excellent performance on the surface of the moon or Mars. Recent testing at NASA s Early Flight Fission Test Facility (EFF-TF) has helped assess the viability of the reference FSP system, and has helped evaluate methods for system integration. In June, 2009, a representative pumped NaK loop (provided by Marshall Space Flight Center) was coupled to a Stirling power converter (provided by Glenn Research Center) and tested at various conditions representative of those that would be seen during actual FSP system operation. In all areas, performance of the integrated system exceeded project goals. High-temperature NaK pump testing has also been performed at the EFF-TF, as has testing of methods for providing long-duration NaK purity.

Houts. Michael G.

2009-01-01

437

Development of Power Electronics for a 0.2kW-Class Ion Thruster  

NASA Technical Reports Server (NTRS)

Applications that might benefit from low power ion propulsion systems include Earth-orbit magnetospheric mapping satellite constellations, low Earth-orbit satellites, geosynchronous Earth-orbit satellite north-south stationkeeping, and asteroid orbiters. These spacecraft are likely to have masses on the order of 50 to 500 kg with up to 0.5 kW of electrical power available. A power processing unit for a 0.2 kW-class ion thruster is currently under development for these applications. The first step in this effort is the development and testing of a 0.24 kW beam power supply. The design incorporates a 20 kHz full bridge topology with multiple secondaries connected in series to obtain outputs of up to 1200 V(sub DC). A current-mode control pulse width modulation circuit built using discrete components was selected for this application. An input voltage of 28 +/- 4 V(sub DC) was assumed, since the small spacecraft for which this system is targeted are anticipated to have unregulated low voltage busses. Efficiencies in excess of 91 percent were obtained at maximum output power. The total mass of the breadboard was less than 1.0 kg and the component mass was 0.53 kg. It is anticipated that a complete flight power processor could weigh about 2.0 kg.

Pinero, Luis R.; Patterson, Michael J.; Bowers, Glen E.

1997-01-01

438

Developing a Computerized Aging Management System for Concrete Structures in Finnish Nuclear Power Plants  

NASA Astrophysics Data System (ADS)

Finland has four nuclear reactors units in two power plants. The first unit started operation in 1977 and in the early 1980's all four units were in use. During the last few years the aging management of the Nuclear Power Plant's (NPP) concrete structures has grown an important issue because the existing structures are reaching the end of their licensed operating lifetime (about 40 years). Therefore the nuclear power companies are developing aging management systems to avoid premature degradation of NPP facilities and to be able to extend their operating lifetime. This paper is about the development of a computerized ageing management system for the nuclear power plants concrete structures. The computerized ageing management system is built upon central database and implementation applications. It will assist the personnel of power companies to implement the aging management activities at different phases of the lifetime of a power plant. It will provide systematic methods for planning, surveillance, inspection, monitoring, condition assessment, maintenance and repair of structures.

Al-Neshawy, F.; Piironen, J.; Sistonen, E.; Vesikari, E.; Tuomisto, M.; Hradil, P.; Ferreira, M.

2013-07-01

439

Development of a Multi-Bus, Multi-Source Reconfigurable Stirling Radioisotope Power System Test Bed  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration (NASA) has typically used Radioisotope Thermoelectric Generators (RTG) as their source of electric power for deep space missions. A more efficient and potentially more cost effective alternative to the RTG, the high efficiency 110 watt Stirling Radioisotope Generator 110 (SRG110) is being developed by the Department of Energy (DOE), Lockheed Martin (LM), Stirling Technology Company (STC) and NASA Glenn Research Center (GRC). The SRG110 consists of two Stirling convertors (Stirling Engine and Linear Alternator) in a dual-opposed configuration, and two General Purpose Heat Source (GPHS) modules. Although Stirling convertors have been successfully operated as a power source for the utility grid and as a stand-alone portable generator, demonstration of the technology required to interconnect two Stirling convertors for a spacecraft power system has not been attempted. NASA GRC is developing a Power System Test Bed (PSTB) to evaluate the performance of a Stirling convertor in an integrated electrical power system application. This paper will describe the status of the PSTB and on-going activities pertaining to the PSTB in the NASA Thermal-Energy Conversion Branch of the Power and On-Board Propulsion Technology Division.

Coleman, Anthony S.

2004-01-01

440

Optimal loading for the development of peak power output in professional rugby players.  

PubMed

The ability to develop high levels of muscular power is considered an essential component of success in many sporting activities; however, the optimal load for the development of peak power during training remains controversial. Our aim in the present study was to determine the optimal load required to observe peak power output during the ballistic bench throw (BBT) and squat jump (SJ) in professional rugby players. Forty-seven, professional, male, rugby players of (mean +/- SD) mass 101.3 +/- 12.8 kg and height 1.82 +/- 0.08 m volunteered and gave informed consent for this study, which was approved by a university ethics committee. Players performed BBT at loads of 20, 30, 40, 50, and 60% of their predetermined 1 repetition maximum (1RM) and SJ at loads of 0, (body mass only), 20, 30, 40, 50, and 60% of their predetermined 1RM in a randomized and balanced order. Power output (PO) was determined by measurement of barbell displacement with subsequent calculation of velocity, force, and power. Relative load had a significant effect on PO for both the BBT (effect size eta(2): 0.297, p < 0.001) and SJ (Effect Size eta(2): 0.709, p < 0.001). Peak power output was produced when the athletes worked against an external load equal to 30% 1RM for the upper body and 0% 1RM for the lower body. PMID:19935101

Bevan, Huw R; Bunce, Paul J; Owen, Nick J; Bennett, Mark A; Cook, Christian J; Cunningham, Dan J; Newton, Robert U; Kilduff, Liam P

2010-01-01

441

Develop and test fuel cell powered on-site integrated total energy systems: Phase 3: Full-scale power plant development  

NASA Technical Reports Server (NTRS)

The development of a commercially viable and cost-effective phospheric acid fuel cell powered on-site integrated energy system (OS/IES) is described. The fuel cell offers energy efficients in the range of 35-40% of the higher heating value of available fuels in the form of electrical energy. In addition, by utilizing the thermal energy generated for heating, ventilating and air-conditioning (HVAC), a fuel cell OS/IES could provide total energy efficiencies in the neighborhood of 80%. Also, the Engelhard fuel cell OS/IES offers the important incentive of replacing imported oil with domestically produced methanol, including coal-derived methanol.

1982-01-01

442

Development and demonstration of high-average power W-band gyro-amplifiers for radar applications  

Microsoft Academic Search

The results of a focused program to develop high-power W-band gyro-amplifiers, which culminated in the demonstration of record average output powers from amplifiers in this band, are described. Following an experimental and theoretical study of low-duty prototype amplifiers, two high-average power devices were designed, built, and demonstrated. The first high-average power amplifier achieved 10.1-kW average output power at 33% efficiency

Monica Blank; K. Felch; B. G. James; P. Borchard; P. Cahalan; T. S. Chu; H. Jory; Bruce G. Danly; Baruch Levush; J. P. Calame; Khanh T. Nguyen; Dean E. Pershing

2002-01-01

443

Development of SMES for power system control: present status and perspective  

NASA Astrophysics Data System (ADS)

A present Japanese national project for SMES development focuses on the development of cost reduction technologies for a small-scale SMES for power system control. Optimal SMES system concepts were developed for power system stabilization and for load fluctuation compensation or frequency regulation. Performance of the designed superconductors was analyzed through fabrication and tests of short sample superconductors. Then, two kinds of model coil systems were manufactured and tested for evaluation of the design concepts and cost reduction technology developments. A multi-pole solenoid coil set as a model coil system for load fluctuation compensation SMES was successfully tested, for example, in 10 000-pulse iterative charge-discharge operations. In addition, application of high- TC superconductors to SMES has been studied for further cost reduction, more reliable operation, etc.

Ohsaki, H.; Taniguchi, S.; Nagaya, S.; Akita, S.; Koso, S.; Tatsuta, M.

2004-10-01

444

Development of a PEMFC Power System with Integrated Balance of Plant  

NASA Technical Reports Server (NTRS)

Autonomous Underwater Vehicles (AUV s) have received increasing attention in recent years as military and commercial users look for means to maintain a mobile and persistent presence in the undersea world. Compact, neutrally buoyant power systems are needed for both small and large vehicles. Batteries are usually employed in these applications, but the energy density and therefore the mission duration are limited with current battery technology. At a certain energy or mission duration requirement, other means to get long duration power become feasible. For example, above 10 kW-hrs liquid oxygen and hydrogen have better specific energy than batteries and are preferable for energy storage as long as a compact system of about 100 W/liter is achievable to convert the chemical energy in these reactants into power. Other reactant forms are possible, such as high pressure gas, chemical hydrides or oxygen carriers, but it is essential that the power system be small and light weight. Recent fuel cell work, primarily focused on NASA applications, has developed power systems that can meet this target power density. Passive flow-through systems, using ejector driven reactant (EDR) flow, integrated into a compact balance of plant have been developed. These systems are thermally and functionally integrated in much the same way as are automotive, air breathing fuel cell systems. These systems fit into the small volumes required for AUV and future NASA applications. Designs have been developed for both a 21" diameter and a larger diameter (LD) AUV. These fuel cell systems occupy a very small portion of the overall energy system, allowing most of the system volume to be used for the reactants. The fuel cell systems have been optimized to use reactants efficiently with high stack efficiency and low parasitic losses. The resulting compact, highly efficient fuel cell system provides exceptional reactant utilization and energy density. Key design variables and supporting test data are presented. Future development activities are described.

Wynne, B.; Diffenderfer, C.; Ferguson, S.; Keyser, J.; Miller, M.; Sievers, B.; Ryan, A.; Vasquez, A.

2012-01-01

445

Development and diffusion of the nuclear power reactor: a comparative analysis  

Microsoft Academic Search

This book focuses on the political and technological institutions that developed and disseminated the nuclear power reactor in six nations: the United States, England, France, the Soviet Union, the Federal Republic of Germany, and Canada. As such, it presents extensive case studies of these nations' developmental programs and, even more important, presents a generalized analytic framework which facilitates the comparison

DeLeon

1979-01-01

446

Development of Photoconductive Power Switch Technology. Progress Report, July 1, 1983-March 31, 1984.  

National Technical Information Service (NTIS)

This report describes the development of photoconductive power switch (PCPS) technology supported by the Air Force Weapons Laboratory (AFWL) during the last six months of CY 1983 and Los Alamos supporting research during the first six months of FY 1984. C...

W. C. Nunnally

1984-01-01

447

Development of an automatic steam generator level control logic at low power operations.  

National Technical Information Service (NTIS)

The main objective of this research is to develop a new feedwater control logic for Ulchin Nuclear Power Plant Unit 3(approx equal)4 (UCN 3(approx equal)4) by incorporating the steam generator level control concept utilized in the UCN 1(approx equal)2 whi...

J. T. Seo J. J. Sohn H. T. Seo C. S. Ko C. H. Kim

1993-01-01

448

Development of 275kV gas cooled type gas-insulated power transformer  

Microsoft Academic Search

A world's first 275kV gas cooled type gas insulated power transformer with a low sound level ideal for urban area, which depends on SF6 gas alone for both insulation and cooling, was developed and has been put into commercial service since 1990 in Hong Kong. This paper presents the design philosophy, the principal technical items, the rating and the feature

A. Kudo; T. Nishitani; T. Yoshikawa; C. T. Wan

1993-01-01

449

Development of a Steam-Powered, Free-Piston Air Compressor.  

National Technical Information Service (NTIS)

Development of an opposed-piston, steam-powered, free-piston air compressor is described. A single-stage model of the compressor was designed and manufactured. The machine was operated for numerous short test runs, up to 30-second duration, during which o...

R. Jones

1968-01-01

450

THE DEVELOPMENT OF RADIATION EMBRITTLEMENT MODELS FOR U.S. POWER REACTOR PRESSURE VESSEL STEELS  

Microsoft Academic Search

The information fusion technique is used to develop radiation embrittlement prediction models for reactor pressure vessel (RPV) steels from U.S. power reactors, including boiling water reactors and pressurized water reactors. The Charpy transition temperature-shift data is used as the primary index of RPV radiation embrittlement in this study. Six parameters Cu, Ni, P, neutron fluence, irradiation time, and irradiation temperature

Jy-An John Wang; Nageswara S Rao

2006-01-01

451

The development of radiation embrittlement models for US power reactor pressure vessel steels  

Microsoft Academic Search

A new approach of utilizing information fusion technique is developed to predict the radiation embrittlement of reactor pressure vessel steels. The Charpy transition temperature shift data contained in the Power Reactor Embrittlement Database is used in this study. Six parameters-Cu, Ni, P, neutron fluence, irradiation time, and irradiation temperature are used in the embrittlement prediction models. The results indicate that

J. A. Wang; N. S. V. Rao; S. Konduri

2007-01-01

452

The development of radiation embrittlement models for US power reactor pressure vessel steels  

Microsoft Academic Search

A new approach of utilizing information fusion technique is developed to predict the radiation embrittlement of reactor pressure vessel steels. The Charpy transition temperature shift data contained in the Power Reactor Embrittlement Database is used in this study. Six parameters-Cu, Ni, P, neutron fluence, irradiation time, and irradiation temperature – are used in the embrittlement prediction models. The results indicate

Jy-An John Wang; Nageswara S Rao; Savanthi Konduri

2007-01-01

453

Workshop: Research and development plans for high power spallation neutron testing at BNL  

SciTech Connect

This report consists of vugraphs from presentations at the meeting. The papers covered the following topics: (1) APS as a proton source; (2) target status for NSNS (National Spallation Neutron Source); (3) spallation neutron source in Japan; (4) liquid LiBi flow loop; and (5) research and development plans for high power tests at the AGS.

NONE

1996-08-05

454

Program Plan for Research and Development of HVDC Power Systems and Components.  

National Technical Information Service (NTIS)

The Division of Electric Energy Systems (EES) of the US Department of Energy (DOE) has formulated a program for research and development (R and D) of high-voltage direct-current (HVDC) power transmission and delivery systems and associated dc components. ...

1984-01-01

455

Advanced Microbial Fuel Cell Development, Miniaturization and Energy and Power Density Enhancement.  

National Technical Information Service (NTIS)

This report covers investigations of advanced microbial H2/O2-fuel cell development, miniaturization, and energy and power density enhancement. The anode is very important in the performance of a microbial fuel cell 'MFC', and is often the limiting factor...

C. M. Li

2007-01-01

456

Theoretical Borderlands: Using Multiple Theoretical Perspectives to Challenge Inequitable Power Structures in Student Development Theory  

ERIC Educational Resources Information Center

This article is an exploration of possibilities and methodological considerations for using multiple theoretical perspectives in research that challenges inequitable power structures in student development theory. Specifically, I explore methodological considerations when partnering queer theory and constructivism in research on lesbian identity…

Abes, Elisa S.

2009-01-01