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1

The application of hydraulics in the 2,000 kW wind turbine generator  

Microsoft Academic Search

A 2000 kW turbine generator using hydraulic power in two of its control systems is being built under the management of NASA Lewis Research Center. The hydraulic systems providing the control torques and forces for the yaw and blade pitch control systems are discussed. The yaw-drive-system hydraulic supply provides the power for positioning the nacelle so that the rotary axis

S. Onufreiczuk

1978-01-01

2

Investigations of Hydraulic Turbines.  

National Technical Information Service (NTIS)

Contents: Effects of the initial degree of turbulence on the hydrodynamic coefficients of the blade systems of axial hydraulic turbines; Accuracy of determining the flow around straight blade cascades; Application of Stanitz and Prian's approximate theory...

G. A. Svinarev

1969-01-01

3

Investigation of oscillatory problems of hydraulic generating units equipped with Francis turbines  

SciTech Connect

In the present paper a method is presented for the study of oscillatory problems of hydraulic generating units equipped with Francis turbines. The accurate equations of the turbine are implemented for the simulation, taking into account water hammer effect. Partial derivatives of turbine flow rate and torque with respect to head and gate opening are deduced from real measurements for the whole loading range. Speed governor dynamics are fully simulated, and the influence of torsional vibrations is studied. The vibration response of the unit to draft tube surges is investigated and the risk of excessive oscillations is evaluated. The approach was developed for diagnosis of excessive vibrations of Kastraki hydro power station in Greece.

Konidaris, D.N. [Public Power Corp. (Greece); Tegopoulos, J.A. [National Technical Univ. of Athens (Greece)

1997-12-01

4

Multiple fixed hydraulic geometry turbine control system  

Microsoft Academic Search

A plurality of selected fixed hydraulic geometry turbine generators are programmed for operation at rated efficiencies by interrupting flow to the turbines under control of a programmable power controller receiving water level, flow and power monitoring inputs. The turbines selected are of discreet sizes simultaneously operative only under maximum flow conditions of the hydropower source, and otherwise operated in accordance

1984-01-01

5

Adjusment of the loads between segments in the hydraulic thrust bearing of a turbine-generator unit  

SciTech Connect

One of the most important stages in the assembly and repair of the thrust bearing of a turbine-generator unit is adjustment of the load on the segments. The generally accepted method of adjusting the loads between segments in a hydraulic thrust bearing is based on measuring the axial deformation of the elastic chambers of indicators and equalizing it. Here it is assumed that sagging of the chambers is plane-parallel. Certain problems that occurred when lining the bearings with Babbitt segments, for example, a decrease of sagging of the chambers with time from 0.2-0.3 mm to almost zero, i.e., an apparent increase of rigidity of the chambers, compelled doubting this.

Zakharov, A.A.

1995-11-01

6

Method of operating a hydraulic turbine or a pump-turbine  

SciTech Connect

A method of operating a hydraulic turbine is described in which, when the hydraulic turbine is operated so as to shift the load from the watered condition at guide vanes closed to the generating operation area in a condition that the runner rotates in the turbine rotating direction, the hydraulic machine is temporarily disconnected from the electric power system thereby to decrease the revolution per minute and to allow the load to smoothly shift from the motoring operation to the power generation operation in the version of the hydraulic machine characteristic, and under this condition, the guide vane is gradually opened to set the revolution per minute to a given value, and then the hydraulic machine is recoupled with the electric power system for gaining the load.

Yokoyama, T.

1981-05-12

7

Downhole hydraulic seismic generator  

DOEpatents

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole.

Gregory, Danny L. (Corrales, NM); Hardee, Harry C. (Albuquerque, NM); Smallwood, David O. (Albuquerque, NM)

1992-01-01

8

Downhole hydraulic seismic generator  

DOEpatents

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole. 4 figs.

Gregory, D.L.; Hardee, H.C.; Smallwood, D.O.

1990-12-31

9

Downhole hydraulic seismic generator  

DOEpatents

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole. 4 figs.

Gregory, D.L.; Hardee, H.C.; Smallwood, D.O.

1990-01-01

10

Hydraulic design of Three Gorges right bank powerhouse turbine for improvement of hydraulic stability  

NASA Astrophysics Data System (ADS)

This paper presents the hydraulic design of Three Gorges Right Bank Powerhouse turbine for improvement of hydraulic stability. The technical challenges faced in the hydraulic design of the turbine are given. The method of hydraulic design for improving the hydraulic stability and particularly for eliminating the upper part load pressure pulsations is clarified. The final hydraulic design results of Three Gorges Right Bank Powerhouse turbine based on modern hydraulic design techniques are presented.

Shi, Q.

2010-08-01

11

MEASURING HYDRAULIC TURBINE DISCHARGE WITH THE ACOUSTIC SCINTILLATION FLOWMETER  

Microsoft Academic Search

Hydraulic turbine discharges in low-head hydroelectric plants, and plants with awkward intake geometries can be measured relatively easily with the Acoustic Scintillation Flowmeter (ASFM). The ASFM is non -intrusive, and may be deployed in intake gate slots in a straightforward manner, lending itself to multiple measurements in the same plant. Examples of measurements in two generating stations are presented. Tow-tank

David D. Lemon; P. Warren; W. Bell

12

Superconducting wind turbine generators  

Microsoft Academic Search

We have examined the potential of 10 MW superconducting direct drive generators to enter the European offshore wind power market and estimated that the production of about 1200 superconducting turbines until 2030 would correspond to 10% of the EU offshore market. The expected properties of future offshore turbines of 8 and 10 MW have been determined from an up-scaling of

A. B. Abrahamsen; N. Mijatovic; E. Seiler; T. Zirngibl; C. Træholt; P. B. Nørgård; N. F. Pedersen; N. H. Andersen; J. Østergård

2010-01-01

13

Hermetic turbine generator  

DOEpatents

A Rankine cycle turbine drives an electric generator and a feed pump, all on a single shaft, and all enclosed within a hermetically sealed case. The shaft is vertically oriented with the turbine exhaust directed downward and the shaft is supported on hydrodynamic fluid film bearings using the process fluid as lubricant and coolant. The selection of process fluid, type of turbine, operating speed, system power rating, and cycle state points are uniquely coordinated to achieve high turbine efficiency at the temperature levels imposed by the recovery of waste heat from the more prevalent industrial processes.

Meacher, John S. (Ballston Lake, NY); Ruscitto, David E. (Ballston Spa, NY)

1982-01-01

14

Study of the UEO-50-4\\/12. 5 electrodialysis unit for use in providing coolant water for hydraulic turbine generators  

Microsoft Academic Search

Methods for obtaining water suitable for cooling hydraulic turbines in hydroelectric power plants are discussed. These methods are ionite desalination and electrodialysis. The desalination method was found to be unsatisfactory but the electrodialysis method was largely free of the disadvantages of the desalination method. The performance of the electrodialysis method is discussed.

S. P. Vysotskii; V. S. Parykin; S. A. Vlasova; V. G. Keshelava; Z. G. Khodorchenko

1983-01-01

15

Development of a hydraulic turbine design method  

NASA Astrophysics Data System (ADS)

In this paper a hydraulic turbine parametric design method is presented which is based on the combination of traditional methods and parametric surface modeling techniques. The blade of the turbine runner is described using Bezier surfaces for the definition of the meridional plane as well as the blade angle distribution, and a thickness distribution applied normal to the mean blade surface. In this way, it is possible to define parametrically the whole runner using a relatively small number of design parameters, compared to conventional methods. The above definition is then combined with a commercial CFD software and a stochastic optimization algorithm towards the development of an automated design optimization procedure. The process is demonstrated with the design of a Francis turbine runner.

Kassanos, Ioannis; Anagnostopoulos, John; Papantonis, Dimitris

2013-10-01

16

Stand alone induction generator with terminal impedance controller and no turbine controls  

Microsoft Academic Search

Induction generators with hydraulic turbines are often used for cogeneration. The same turbine generator configuration can be used for stand-alone generation if an impedance controller is connected to the generator terminals; this configuration requires no hydraulic controls on the turbine. The authors propose an electronic impedance controller to control the voltage and the frequency of a stand-alone induction generator. The

R. Bonert; G. Hoops

1990-01-01

17

NEXT GENERATION TURBINE PROGRAM  

Microsoft Academic Search

The Next Generation Turbine (NGT) Program's technological development focused on a study of the feasibility of turbine systems greater than 30 MW that offer improvement over the 1999 state-of-the-art systems. This program targeted goals of 50 percent turndown ratios, 15 percent reduction in generation cost\\/kW hour, improved service life, reduced emissions, 400 starts\\/year with 10 minutes to full load, and

William H. Day

2002-01-01

18

Adjustment of the loads between segments in the hydraulic thrust bearing of a turbine-generator unit  

Microsoft Academic Search

Conclusions 1.The real deformation of elastic chambers of the thrust bearing on a hydraulic support under a load is plane-inclined in certain cases.2.Adjustment of the load on the bearing segments with installation of one indicator on the chamber does not always provide the necessary accuracy.3.It is advisable to adjust the bearing according to the method presented with the installation of

A. A. Zakharov

1995-01-01

19

Wind turbine-generator  

SciTech Connect

A wind-turbine generator system is described which transforms the rotational energy of a wind driven turbine blade into rotation in opposite directions of a rotor and a stator of a dynamoelectric machine to generate electrical power. A bevel gear rotating with the turbine blade drives two pinion gears and associated concentric shafts in opposite directions. The two shafts combine with a planetary gear set to provide the desired oppositely directed rotation. One of the shafts is associated with a ring carrier and drives a ring gear in one rotational direction. The other shaft drives a planet carrier in the opposite rotational direction. The planetary gear set is arranged such that a sun gear is driven in the direction opposite to that of the ring gear. A rotor is affixed to the sun gear by a spider support structure, and a stator, affixed to rotate with the ring gear, surrounds the rotor. The rotor and stator are thus rotated in opposite, mechanically and electrically additive, directions.

Kirschbaum, H.S.

1981-09-22

20

Application study of magnetic fluid seal in hydraulic turbine  

NASA Astrophysics Data System (ADS)

The waterpower resources of our country are abundant, and the hydroelectric power is developed, but at present the main shaft sealing device of hydraulic turbine is easy to wear and tear and the leakage is great. The magnetic fluid seal has the advantages of no contact, no wear, self-healing, long life and so on. In this paper, the magnetic fluid seal would be used in the main shaft of hydraulic turbine, the sealing structure was built the model, meshed the geometry, applied loads and solved by using MULTIPHYSICS in ANSYS software, the influence of the various sealing structural parameters such as tooth width, height, slot width, sealing gap on the sealing property were analyzed, the magnetic fluid sealing device suitable for large-diameter shaft and sealing water was designed, the sealing problem of the hydraulic turbine main shaft was solved effectively which will bring huge economic benefits.

Yu, Z. Y.; Zhang, W.

2012-11-01

21

Failure analysis of hydraulic turbine shaft  

Microsoft Academic Search

This paper describes the analysis of major failure of 28MW horizontal hydro turbine shaft. The analysis of load carrying capacity of critical radius and fractography analysis are presented. Special emphasize is on metallurgical failure analysis of in-service crack initiation. The analysis of stresses is obtained by the finite element method and the developed model and load conditions are described. Finite

Dejan Mom?ilovi?; Zoran Odanovi?; Radivoje Mitrovi?; Ivana Atanasovska; Tomaž Vuherer

22

3D numerical simulation of transient processes in hydraulic turbines  

NASA Astrophysics Data System (ADS)

An approach for numerical simulation of 3D hydraulic turbine flows in transient operating regimes is presented. The method is based on a coupled solution of incompressible RANS equations, runner rotation equation, and water hammer equations. The issue of setting appropriate boundary conditions is considered in detail. As an illustration, the simulation results for runaway process are presented. The evolution of vortex structure and its effect on computed runaway traces are analyzed.

Cherny, S.; Chirkov, D.; Bannikov, D.; Lapin, V.; Skorospelov, V.; Eshkunova, I.; Avdushenko, A.

2010-08-01

23

A Robot for Welding Repair of Hydraulic Turbine Blade  

Microsoft Academic Search

This paper proposed a scheme of using rail-free multifunctional robot in onsite repair of hydraulic turbine blade for large-scale axial-flow and Francis runners. The robot processes such functions as profile detection and measurement, air-gouging cleaning, grinding, welding and so on. The robot's main body is composed of an all-position rail-free mobile platform and a multiple degree-of-freedom (DOF) manipulator. The mobile

Qiang Chen; Zhenguo Sun; Wenzeng Zhang; Zhongcheng Gui

2008-01-01

24

Governor Characteristics for Large Hydraulic Turbines.  

National Technical Information Service (NTIS)

In considering appropriate parameters for large hydropower generating units, the choice of control characteristics to satisfy power system needs strongly influences the economics of design. Parameters fundamental to control characteristics which can be de...

F. R. Schleif

1971-01-01

25

Dynamics and Stability of Wind Turbine Generators  

Microsoft Academic Search

This paper describes the dynamic and stability properties of wind turbine generators connected to power systems. Both synchronous and induction generators are considered. A comparison is made between wind turbines, steam, and hydro units. The unusual phenomena associated with wind turbines are emphasized. The general control requirements are discussed, as well as various schemes for torsional damping such as speed

E. N. Hinrichsen; P. J. Nolan

1982-01-01

26

Numerical prediction of erosion on guide vanes and in labyrinth seals in hydraulic turbines  

Microsoft Academic Search

Erosion in hydraulic power plants is caused by sand particles in the flow. This is one of the major problems that restricts the lifetime between overhauls of water turbines. Especially those parts of the hydraulic turbine which are exposed to high flow velocities bear a considerable risk of being damaged by erosion processes. Therefore, suitable methods for the prediction of

Reiner Mack; Peter Drtina; Egon Lang

1999-01-01

27

Study of turbine-generator shaft parameters from the viewpoint of subsynchronous resonance  

Microsoft Academic Search

Changes to the mechanical design have not received any consideration as a solution to the subsynchronous resonance (SSR) problem. This is mainly because the ordering and manufacture of the turbine-generator has often been done long before the SSR problem is diagnosed. It is observed that hydraulic turbines do not experience SSR problems and that the problem occurs with varying degrees

E. S. Ibrahim

1996-01-01

28

Performance characteristics of hydraulic turbines and pumps. Proceedings of the Winter annual meeting, Boston, MA, November 13-18, 1983  

Microsoft Academic Search

Various topics are addressed under the headings: four quadrant and two-phase performance of turbines and pumps, cavitation in hydraulic turbines and pumps, pumps as power recovery turbines, and modeling and fluid dynamics in hydraulic turbines and pumps. Individual subjects considered include: representation of pump characteristics for transient analysis, prediction and measurement of the four-quadrant performance of an axial flow pump

G. Jr. Bennett; W. L. Swift

1983-01-01

29

NEXT GENERATION TURBINE SYSTEM STUDY  

SciTech Connect

Rolls-Royce has completed a preliminary design and marketing study under a Department of Energy (DOE) cost shared contract (DE-AC26-00NT40852) to analyze the feasibility of developing a clean, high efficiency, and flexible Next Generation Turbine (NGT) system to meet the power generation market needs of the year 2007 and beyond. Rolls-Royce evaluated the full range of its most advanced commercial aerospace and aeroderivative engines alongside the special technologies necessary to achieve the aggressive efficiency, performance, emissions, economic, and flexibility targets desired by the DOE. Heavy emphasis was placed on evaluating the technical risks and the economic viability of various concept and technology options available. This was necessary to ensure the resulting advanced NGT system would provide extensive public benefits and significant customer benefits without introducing unacceptable levels of technical and operational risk that would impair the market acceptance of the resulting product. Two advanced cycle configurations were identified as offering significant advantages over current combined cycle products available in the market. In addition, balance of plant (BOP) technologies, as well as capabilities to improve the reliability, availability, and maintainability (RAM) of industrial gas turbine engines, have been identified. A customer focused survey and economic analysis of a proposed Rolls-Royce NGT product configuration was also accomplished as a part of this research study. The proposed Rolls-Royce NGT solution could offer customers clean, flexible power generation systems with very high efficiencies, similar to combined cycle plants, but at a much lower specific cost, similar to those of simple cycle plants.

Frank Macri

2002-02-28

30

Optimum siting of wind turbine generators  

Microsoft Academic Search

This paper investigates optimum siting of wind turbine generators from the viewpoint of site and wind turbine generator selection. The methodology of analysis is based on the accurate assessment of wind power potential of various sites. The analytical computations of annual and monthly capacity factors are done using the Weibull statistical model using cubic mean cube root of wind speeds.

Suresh H. Jangamshetti; V. G. Ran

2001-01-01

31

Hydraulic optimization of "S" characteristics of the pump-turbine for Xianju pumped storage plant  

NASA Astrophysics Data System (ADS)

The pump-turbine with a rated power capacity of 375MW each at Xianju pumped storage plant is the most powerful one under construction in China. In order to avoid the instability near no-load conditions, the hydraulic design of the pump-turbine has been optimized to improving the "S" characteristic in the development of the model pump-turbine. This paper presents the cause of "S" characteristic of a pump-turbine by CFD simulation of the internal flow. Based on the CFD analysis, the hydraulic design optimization of the pump-turbine was carried out to eliminate the "S" characteristics of the machine at Xianju pumped storage plant and a big step for removing the "S" characteristic of a pump-turbine has been obtained. The model test results demonstrate that the pump-turbine designed for Xianju pumped storage plant can smoothly operate near no-load conditions without an addition of misaligned guide vanes.

Liu, W. C.; Zheng, J. S.; Cheng, J.; Shi, Q. H.

2012-11-01

32

Project title: micro turbine generator program  

Microsoft Academic Search

A number of micro turbines generators have been announced as currently commercially available for sale to customers, such as end users, utilities, and energy service providers. Manufacturers and others are reporting certain performance capabilities of the turbines; however, no consistent third-party independent testing as been done to confirm or discredit such performance claims. The purpose of this project is to

S. L. Hamilton

2000-01-01

33

Effect of the coupling between hydraulic turbine set and power grid on power grid dynamic stability  

Microsoft Academic Search

With the proportion of hydroelectric power station in power grid and the single-turbine capacity larger and larger, the effect of hydraulic turbine set on power system dynamic stability will be more significant. The power oscillation phenomenon, which affects the safe and stable operation of power system, occurred many times in China. For example, on October 29th, 2005, low frequency oscillation

Xin Jianbo; Han Zhiyong; He Renmu

2009-01-01

34

Novel Repair Technique for Life-Extension of Hydraulic Turbine Components in Hydroelectric Power Stations  

Microsoft Academic Search

A significant number of hydraulic turbines operated in Japan were installed in the first half of the 20th century. Today, aging degradation and flaws are observed in these turbine equipments. So far, Japanese engineers have applied NDI technology of Ultrasonic Testing (UT) to detect the flaws, and after empirical evaluation of the remaining life they decided an adequate moment to

Yoichi Hiramatsu; Jun Ishii; Kazuhiro Funato

2008-01-01

35

NEXT GENERATION GAS TURBINE SYSTEMS STUDY  

SciTech Connect

Under sponsorship of the U.S. Department of Energy's National Energy Technology Laboratory, Siemens Westinghouse Power Corporation has conducted a study of Next Generation Gas Turbine Systems that embraces the goals of the DOE's High Efficiency Engines and Turbines and Vision 21 programs. The Siemens Westinghouse Next Generation Gas Turbine (NGGT) Systems program was a 24-month study looking at the feasibility of a NGGT for the emerging deregulated distributed generation market. Initial efforts focused on a modular gas turbine using an innovative blend of proven technologies from the Siemens Westinghouse W501 series of gas turbines and new enabling technologies to serve a wide variety of applications. The flexibility to serve both 50-Hz and 60-Hz applications, use a wide range of fuels and be configured for peaking, intermediate and base load duty cycles was the ultimate goal. As the study progressed the emphasis shifted from a flexible gas turbine system of a specific size to a broader gas turbine technology focus. This shift in direction allowed for greater placement of technology among both the existing fleet and new engine designs, regardless of size, and will ultimately provide for greater public benefit. This report describes the study efforts and provides the resultant conclusions and recommendations for future technology development in collaboration with the DOE.

Benjamin C. Wiant; Ihor S. Diakunchak; Dennis A. Horazak; Harry T. Morehead

2003-03-01

36

Dual-speed wind turbine generation  

SciTech Connect

Induction generator has been used since the early development of utility-scale wind turbine generation. An induction generator is the generator of choice because of its ruggedness and low cost. With an induction generator, the operating speed of the wind turbine is limited to a narrow range (almost constant speed). Dual- speed operation can be accomplished by using an induction generator with two different sets of winding configurations or by using a dual output drive train to drive two induction generators with two different rated speeds. With single-speed operation, the wind turbine operates at different power coefficients (Cp) as the wind speed varies. Operation at maximum Cp can occur only at a single wind speed. However, if the wind speed.varies across a wider range, the operating Cp will vary significantly. Dual-speed operation has the advantage of enabling the wind turbine to operate at near maximum Cp over a wider range of wind speeds. Thus, annual energy production can be increased. The dual-speed mode may generate less energy than a variable-speed mode; nevertheless, it offers an alternative which captures more energy than single-speed operation. In this paper, dual-speed operation of a wind turbine is investigated. Annual energy production is compared between single-speed and dual-speed operation. One type of control algorithm for dual-speed operation is proposed. Some results from a dynamic simulation will be presented to show how the control algorithm works as the wind turbine is exposed to varying wind speeds.

Muljadi, E.; Butterfield, C.P. [National Renewable Energy Lab., Golden, CO (United States); Handman, D. [Flowind Corp., San Rafael, CA (United States)

1996-10-01

37

Variable speed generator technology options for wind turbine generators  

NASA Astrophysics Data System (ADS)

The electrical system options for variable speed operation of a wind turbine generator are treated in this paper. The key operating characteristics of each system are discussed and the major advantages and disadvantages of each are identified

Lipo, T. A.

1995-05-01

38

Dynamic performance analysis of a hybrid wind turbine generator system  

Microsoft Academic Search

The dynamic performances of a hybrid wind turbine generator system using a shaft generator system are investigated. The hybrid system consists of a wind turbine and generator, a rectifier, a current-source thyristor inverter, a synchronous generator driven by a prime mover and a duplex reactor. The configuration of the hybrid wind turbine generator system is explained first, and a dynamic

Yuutaro Fujii; Chihiro Hasegawa; Fujio Tatsuta; Shoji Nishikata

2008-01-01

39

Simulation model of radial vibration for a large hydro-turbine generator unit and its application  

Microsoft Academic Search

Simulating to predict the dynamic response of large hydro-turbine generator units (hydro-units) is of great significance. In this paper, a rotordynamic model of radial vibration is presented, which takes into account guide bearing, thrust bearing, unbalanced magnetic pull, hydraulic force and unbalanced force. The brief and practical database method is employed to model the guide bearing. Taking advantage of the

Yong Xu; Zhaohui Li; Xide Lai

2011-01-01

40

Hydraulic evaluation and optimisation of T. Basse's wave turbine.  

National Technical Information Service (NTIS)

The present study investigates designs of the wing profiles and layouts of the wave turbine in order to optimize the design. Furthermore, the overall power production capability of the device has been estimated for the selected wing profiles and turbine l...

1999-01-01

41

Small geothermal power plant. Portable turbine generator  

Microsoft Academic Search

The initial cost of geothermal power plant per kW output electricity will generally increase if the unit becomes smaller. In order to encourage the utilization of small geothermal energy, the low initial cost equipments must be developed. The small geothermal power plant equipment shall be delivered in short time, transported easily, and installed in short periods. Geothermal portable turbine generator

N. Nakamura

1982-01-01

42

Wind Turbine Generator System Safety and Function Test Report for the Ventera VT10 Wind Turbine.  

National Technical Information Service (NTIS)

This report summarizes the results of a safety and function test that NREL conducted on the Ventera VT10 wind turbine. This test was conducted in accordance with the International Electrotechnical Commissions' (IEC) standard, Wind Turbine Generator System...

A. Huskey D. Jager J. Hur J. Smith

2012-01-01

43

Wind Turbine Generator System Safety and Function Test Report for the Entegrity EW50 Wind Turbine.  

National Technical Information Service (NTIS)

This report summarizes the results of a safety and function test that NREL conducted on the Entegrity EW50 wind turbine. This test was conducted in accordance with the International Electrotechnical Commissions' (IEC) standard, Wind Turbine Generator Syst...

A. Huskey D. Jager J. Hur J. Smith

2012-01-01

44

Blade pitch angle control for a wind turbine generator  

Microsoft Academic Search

A blade pitch angle control for a wind turbine-generator establishing an optimum power or torque reference signal which, when operating conditions so warrant, is not limited by the nominal torque or power ratings of various turbine generator components. The reference signal is indicative of a maximum blade angle setting for safe operation of the wind turbine. An integral or lag

K. I. Harner; J. M. Kos; J. P. Patrick

1982-01-01

45

18. TURBINE AND GENERATOR SHAFT IN CONCRETE HOUSING OF THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. TURBINE AND GENERATOR SHAFT IN CONCRETE HOUSING OF THE TURBINE FLUME. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

46

Small geothermal power plant. Portable turbine generator  

NASA Astrophysics Data System (ADS)

The initial cost of geothermal power plant per kW output electricity will generally increase if the unit becomes smaller. In order to encourage the utilization of small geothermal energy, the low initial cost equipments must be developed. The small geothermal power plant equipment shall be delivered in short time, transported easily, and installed in short periods. Geothermal portable turbine generator meets these requirements. Therefore, this is suitable for the power generation in the area with small electric power demand such as small islands and isolated area.

Nakamura, N.

1982-12-01

47

CFD Analysis for the Performance of Cross-Flow Hydraulic Turbine with the Variation of Blade Angle  

NASA Astrophysics Data System (ADS)

The purpose of this study is both to further optimize the structure of cross-flow turbine and to improve the turbine performance. Optimization of the turbine structure has been made by the analysis of the turbine performance with the variation of the blade angle using a commercial CFD code. The results show that inlet and outlet angles of the runner blade give considerable effect on the performance of the turbine. Pressure on the surface of the runner blade changes considerably with the variation of blade angle both at the stages 1 and 2 but relatively small change occurs for the fluid velocity of cross-flow hydraulic turbine. Recirculating flow in the runner passage causes considerable hydraulic loss by which efficiency of the turbine decreases very much.

Choi, Y. D.; Lim, J.. I.; Kim, C. G.; Kim, Y. T.; Lee, Y. H.

48

Development of the helical reaction hydraulic turbine. Final technical report, July 1, 1996--June 30, 1998  

SciTech Connect

The present report contains the final results obtained during July 1996--July 1998. This report should be considered in association with the Annual Progress Report submitted in July 1997 due to the fact that not all of the intermediate results reflected in the Progress Report have been included in the Final Report. The aim of the project was to build a helical hydraulic turbine prototype and demonstrate its suitability and advantages as a novel apparatus to harness hydropower from ultra low-head rivers and other free water streams such as ocean currents or rivers without dams. The research objectives of the project are: Design, optimization and selection of the hydro foil section for the helical turbine; Design of the turbine for demonstration project; Construction and testing of the turbine module; Assessing test results and determining scale-up feasibility. The research conducted under this project has substantially exceeded the original goals including designing, constructing and testing of a scaled-up triple-helix turbine, as well as developing recommendations for application of the turbine for direct water pumping in irrigation systems and for future use in wind farms. Measurements collected during two years of turbine testing are kept in the PI files.

Gorlov, A.

1998-08-01

49

Problems assciated with the operating reliability of heavy-duty hydraulic turbines  

Microsoft Academic Search

Conclusions  \\u000a \\u000a \\u000a \\u000a 1. \\u000a \\u000a The study and codification of the operating experience gained with heavy-duty rotary-blade and radial-axial hydraulic turbines\\u000a made it possible to obtain quantitative estimates of the reliability characteristics of basis subassemblies and components\\u000a of the equipment and to ascertain the character of the failure distribution as a function of turbine operation. The estimates\\u000a obtained make it possible to make

G. A. Vil'ner

1976-01-01

50

CAN-Bus Based Distributed Control System for Hydraulic Turbine Blade Repairing Robot  

Microsoft Academic Search

\\u000a A CAN-bus (Controller Area Network) based distributed control system was designed for a mobile on-site hydraulic turbine blade\\u000a repairing robot (HTBRR). The system is composed of one supervisory station, seven joint servo nodes, and four accessory nodes.\\u000a Visual image sensing, virtual reality and graphic based path planning are implemented on the supervisory station, to improve\\u000a tele-operation. Each joint servo node

Kangtai Xiang; Zhenguo Sun; Hongjun Dai; Qiang Chen; Jiajun Liu

2010-01-01

51

Can coal keep gas turbines in utility generating plans  

Microsoft Academic Search

The future of the gas turbine in electric utility generating systems may depend on its ability to burn coal. Research programs to develop that ability that are being conducted by gas turbine manufacturers, the Electric Power Research Institute, and the Energy Research and Development Administration were the main points of discussion at the recent ASME gas turbine conference in Philadelphia.

Smock

1977-01-01

52

The Net National Burden of Canadian Antidumping Policy: Turbines and Generators  

Microsoft Academic Search

This paper presents an analysis of two important decisions of the anti-dumping Tribunal concerning the importation of hydraulic turbines from the USSR and hydro-electric generators from Japan. This study attempts to determine the social cost that anti-dumping measured would have imposed on the country had they been in effect during the period 1971-1979. I conclude, had anti-dumping measures been in

Klaus Stegemann

1981-01-01

53

10. INTERIOR, MAIN BUILDING, LOOKING SOUTH, SHOWING TWO TURBINE GENERATOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. INTERIOR, MAIN BUILDING, LOOKING SOUTH, SHOWING TWO TURBINE GENERATOR SETS (FOREGROUND) AND AN AIR COMPRESSOR (BACKGROUND) - Central Power Station, Puget Sound Naval Shipyard, Bremerton, Kitsap County, WA

54

Wind Turbine Generator System Power Performance Test Report for the ARE442 Wind Turbine  

SciTech Connect

This report summarizes the results of a power performance test that NREL conducted on the ARE 442 wind turbine. This test was conducted in accordance with the International Electrotechnical Commission's (IEC) standard, Wind Turbine Generator Systems Part 12: Power Performance Measurements of Electricity Producing Wind Turbines, IEC 61400-12-1 Ed.1.0, 2005-12. However, because the ARE 442 is a small turbine as defined by IEC, NREL also followed Annex H that applies to small wind turbines. In these summary results, wind speed is normalized to sea-level air density.

van Dam, J.; Jager, D.

2010-02-01

55

Steam turbine for geothermal power generation  

Microsoft Academic Search

A steam turbine comprises a casing; turbine vanes rotatably set in the casing; a plurality of partition walls which extend along radial directions from the rotation center of the turbine vanes to define a plurality of steam valve chambers in the casing; steam supply pipes respectively connected to the corresponding steam valve chambers; and regulating valves which are fitted to

K. Tsujimura; Y. Hadano

1984-01-01

56

Operation of a third generation wind turbine  

Microsoft Academic Search

A modern wind turbine was installed on May 26, 1982, at the USDA Conservation and Production Research Laboratory, Bushland, Texas. This wind machine was used to provide electrical energy for irrigation pumping and other agricultural loads. The wind turbine purchased for this research is an Enertech Model 44, manufactured by Enertech Corporation, Norwich, Vermont. The horizontal-axis wind turbine has a

F. C. Vosper; R. N. Clark

1983-01-01

57

Hydraulic Turbines: The Francis Turbine. Technical Terminology Bulletin. Terminotech, Vol. 2, No. 2.  

ERIC Educational Resources Information Center

|This issue of a bulletin of technological terminology is devoted to the Francis turbine. A brief narrative on the subject is presented in both French and English. An English-French dictionary of terms comprises the bulk of the document. An explanatory illustration is appended. (JB)|

General Electric Co. of Canada, Ltd., Montreal, Quebec.

58

Hydraulic Turbines: The Pelton Turbine. Technical Terminology Bulletin. Terminotech, Vol. 2, No. 3.  

ERIC Educational Resources Information Center

|This issue of a bulletin of technological terminology is devoted to the Pelton turbine. A brief narrative on the subject is presented in both French and English. An English-French dictionary of terms comprises the bulk of the document. Explanatory illustrations are appended. (JB)|

General Electric Co. of Canada, Ltd., Montreal, Quebec.

59

Hydraulic Turbines: The Pelton Turbine. Technical Terminology Bulletin. Terminotech, Vol. 2, No. 3.  

ERIC Educational Resources Information Center

This issue of a bulletin of technological terminology is devoted to the Pelton turbine. A brief narrative on the subject is presented in both French and English. An English-French dictionary of terms comprises the bulk of the document. Explanatory illustrations are appended. (JB)

General Electric Co. of Canada, Ltd., Montreal, Quebec.

60

Hydraulic Turbines: The Francis Turbine. Technical Terminology Bulletin. Terminotech, Vol. 2, No. 2.  

ERIC Educational Resources Information Center

This issue of a bulletin of technological terminology is devoted to the Francis turbine. A brief narrative on the subject is presented in both French and English. An English-French dictionary of terms comprises the bulk of the document. An explanatory illustration is appended. (JB)

General Electric Co. of Canada, Ltd., Montreal, Quebec.

61

Computational and experimental study of effects of sediment shape on erosion of hydraulic turbines  

NASA Astrophysics Data System (ADS)

Hard particles as Quartz and Feldspar are present in large amount in most of the rivers across the Himalayan basins. In run-off-river hydro power plants these particles find way to turbine and cause its components to erode. Loss of turbine material due to the erosion and subsequent change in flow pattern induce several operational and maintenance problems in the power plants. Reduction in overall efficiency, vibrations and reduced life of turbine components are the major effects of sediment erosion of hydraulic turbines. Sediment erosion of hydraulic turbines is a complex phenomenon and depends upon several factors. One of the most influencing parameter is the characteristics of sediment particles. Quantity of sediment particles, which are harder than the turbine material, is one of the bases to indicate erosion potential of a particular site. Research findings have indicated that shape and size of the hard particles together with velocity of impact play a major role to decide the mode and rate of erosion in turbine components. It is not a common practice in Himalayan basins to conduct a detail study of sediment characteristics as a part of feasibility study for hydropower projects. Lack of scientifically verified procedures and guidelines to conduct the sediment analysis to estimate its erosion potential is one of the reasons to overlook this important part of feasibility study. Present study has been conducted by implementing computational tools to characterize the sediment particles with respect to their shape and size. Experimental studies have also been done to analyze the effects of different combinations of shape and size of hard particles on turbine material. Efforts have also been given to develop standard procedures to conduct similar study to compare erosion potential between different hydropower sites. Digital image processing software and sieve analyzer have been utilized to extract shape and size of sediment particles from the erosion sensitive power plants. The experimental studies of impact of different shapes and sizes of sediment particles on hydraulic turbine material have been conducted on two different test rigs method at Kathmandu University, High velocity test rig method and Rotating Disc apparatus (RDA) at Kathmandu University. Twenty one different sediment shape samples and four different sand size range were studied to correlate the effects of sediment shape and size with the erosion of turbine material. It was observed that the shape of sediment particles have considerable effect on erosion of turbine material. In general Irregular shapes have more erosion potential than regular shapes. It was also observed that the particles with the irregular shape of smaller size induce higher erosion rates than that of the larger size with the same shape. These findings will help to select the proper site of a power plant in erosion prone basins and would also help to design suitable settling basins to trap sediment particles having higher erosion potentials.

Poudel, L.; Thapa, B.; Shrestha, B. P.; Thapa, B. S.; Shrestha, K. P.; Shrestha, N. K.

2012-11-01

62

Novel Repair Technique for Life-Extension of Hydraulic Turbine Components in Hydroelectric Power Stations  

NASA Astrophysics Data System (ADS)

A significant number of hydraulic turbines operated in Japan were installed in the first half of the 20th century. Today, aging degradation and flaws are observed in these turbine equipments. So far, Japanese engineers have applied NDI technology of Ultrasonic Testing (UT) to detect the flaws, and after empirical evaluation of the remaining life they decided an adequate moment to replace the equipments. Since the replacement requires a large-scale field site works and high-cost, one of the solutions for life-extension of the equipments is introduction of repair services. We have been working in order to enhance the accuracy of results during the detection of flaws and flaws dimensioning, in particular focusing on the techniques of Tip-echo, TOFD and Phased-Array UT, accompanied by the conventional UT. These NDI methods made possible to recognize the entire image of surface and embedded flaws with complicated geometry. Then, we have developed an evaluation system of these flaws based on the theory of crack propagation, of the logic of crack growth driven by the stress-intensity factor of the crack tip front. The sophisticated evaluation system is constituted by a hand-made software and database of stress-intensity factor. Based on these elemental technologies, we propose a technique of repair welding to provide a life-extension of hydraulic turbine components.

Hiramatsu, Yoichi; Ishii, Jun; Funato, Kazuhiro

63

Advanced Combustion Systems for Next Generation Gas Turbines. (Final Report, June 2002-December 2005).  

National Technical Information Service (NTIS)

Next generation turbine power plants will require high efficiency gas turbines with higher pressure ratios and turbine inlet temperatures than currently available. These increases in gas turbine cycle conditions will tend to increase NOx emissions. As the...

C. Russell J. Haynes J. Janssen M. Huffman

2006-01-01

64

Cavitation wear in hydraulic turbines at the Bratsk hydroelectric power plant  

Microsoft Academic Search

Conclusions  \\u000a \\u000a \\u000a \\u000a 1. \\u000a \\u000a A considerable cavitation wear of the runner blades at the Bratsk hydroelectric power plant occurred as the result of operating\\u000a the hydraulic turbines under conditions falling outside the design range and due to distortion of the blade profile caused\\u000a by electrode surfacing on a large scale carried out during repairs.\\u000a \\u000a \\u000a \\u000a \\u000a 2. \\u000a \\u000a The most effective method of reducing cavitation

I. S. Glukhov

1975-01-01

65

Recent experience of IFFM PAS in the design process of lowhead propeller hydraulic turbines for Small Hydro  

NASA Astrophysics Data System (ADS)

The paper contains the short description of the design process of the axial flow turbines for Small Hydro. The crucial elements of the process are: ARDES programme for 1D inverse problem (containing the statistic information of the well performed hydraulic units, applying the lifting aerofoil theory); determination of universal hill diagram and optimization of the runner blades geometry by utilization of the 3D CFD codes. As the result of design process with utilization of both design steps, the generated runner blades geometry (1D inverse problem) and some computational results of 3D CFD solver have been presented. As the conclusion some crucial remarks of the designed process have been brought forward.

Kaniecki, M.; Krzemianowski, Z.

2010-08-01

66

Wind turbine and method for power generation  

SciTech Connect

A wind turbine for generation of electricity is described comprising a large, lightweight wheel attached to a fixed vertical central pylon and oriented to rotate in a vertical plane around a boom having an axis that is substantially horizontal, and pivoted at one end to the pylon. The wind wheel is supported at its rim by a carriage assembly that is constrained to move in a circular horizontal path about the central pylon. The wheel has a cylindrical outer rim and may include one or more perimeter frame structures. The outer surface of the rim is essentially flat in cross section and presents a traction surface for the takeoff of energy from the rim of the wheel. The wheel has a plurality of uniformly spaced radial spindles on which are rolled sails (Soft airfoils), which when unfurled catch the wind to provide the rotational motion to the wheel. The carriage assembly may be moved around the pylon by driver means to accommodate for changes in wind direction, or the wind wheel as a whole can be allowed to move freely to assume the preferred wind direction in the manner of a weather vane. The wheel and frame structure are secured to and supports the horizontal boom which lies colinear with the axis of the wheel and projects longitudinally in both directions from the central plane of the wheel. The entire boom structure is supported by means of stays from the perimeter of the rim to the ends of the boom. Detailed rigging and traveler assemblies for control and operation of the wind turbine are disclosed.

Cook, G.E.

1982-09-21

67

Effect of control algorithms on fixed pitch wind turbine generators  

SciTech Connect

The effect of control upon wind turbine performance is described using actual wind speed data from a wind farm in California. The algorithms studied are currently in use by some turbine manufacturers. The algorithms were studied using a computer model of a fixed pitch, utility connected wind turbine with an induction generator. The algorithm efficiency was found to be robust over a wide range of parameters. However, the number of start/stops varied greatly with different algorithms and parameters.

Rizzi, M.P. (Measurex Corp., Cupertino, CA (USA)); Auslander, D.M. (California Univ., Berkeley, CA (USA))

1990-08-01

68

46 CFR 112.50-3 - Hydraulic starting.  

Code of Federal Regulations, 2012 CFR

...OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING EMERGENCY LIGHTING AND POWER SYSTEMS Emergency Diesel and Gas Turbine Engine Driven Generator Sets § 112.50-3 Hydraulic starting. A hydraulic starting system must meet the...

2012-10-01

69

Marine gas turbines; A new generation  

SciTech Connect

A majority of the Western world's naval fleets use gas turbine engines for propulsion and electricity. According to this analysis, in the 21st century, marine gas turbines will use intercooled compressor and recuperator (ICR) designs for increased power and higher thermal efficiency, and integrated electric drive systems to save fuel and cut weight and costs.

Harmon, R.A

1990-05-01

70

Using neural networks to estimate wind turbine power generation  

Microsoft Academic Search

This paper uses data collected at Central and South West Services Fort Davis wind farm (USA) to develop a neural network based prediction of power produced by each turbine. The power generated by electric wind turbines changes rapidly because of the continuous fluctuation of wind speed and direction. It is important for the power industry to have the capability to

Shuhui Li; Donald C. Wunsch; Edgar A. O'Hair; Michael G. Giesselmann

2001-01-01

71

Representing wind turbine electrical generating systems in fundamental frequency simulations  

Microsoft Academic Search

Increasing numbers of wind turbines are being erected. In the near future, they may start to influence the dynamics of electrical power systems by interacting with conventional generation equipment and with loads. The impact of wind turbines on the dynamics of electrical power systems therefore becomes an important subject, studied by means of power system dynamics simulations. Various types of

J. G. Slootweg; H. Polinder; W. L. Kling

2003-01-01

72

Hydro-turbine device for generating electricity  

SciTech Connect

A hydro-turbine device includes a frame mounted in a channel through which water flows, the frame mounting a horizontal shaft carrying a turbine wheel having spaced end plates between which extend a plurality of arcuate vanes. A cover is mounted over the rear of the turbine wheel, and carries an extension on the front thereof that has an arcuate scoop mounted on its under side. The arcuate scoop is arranged to capture water flowing toward the turbine wheel and direct it centrally against the concave rear faces of the vanes, so as to effect maximum energy removal from the water. The cover is positioned and arranged to enhance aspirator action for efficiently removing spent water from the turbine wheel.

Vary, P.

1984-03-13

73

Experimental comparison of cavitation erosion rates of different steels used in hydraulic turbines  

NASA Astrophysics Data System (ADS)

The prediction of cavitation erosion rates has an important role in order to evaluate the exact life of components in fluid machineries. Hydro-Québec has studied this phenomenon for several years, in particular in hydraulic turbine runners, to try to understand the different degradation mechanisms related to this phenomenon. This paper presents part of this work. In this study, we carried out experimental erosion tests to compare different steels used in actual hydraulic turbine runners (carbon steels, austenitic and martensitic stainless steels) to high strength steels in terms of cavitation erosion resistance. The results for these different classes of steels are presented. The tests have been performed in a cavitating liquid jet apparatus according to the ASTM G134-95 standard to simulate the flow conditions. The mass loss has been followed during the exposure time. The maximum depth of erosion, the mean depth of erosion, and the mean depth erosion rate are determined. As a result we found that ASTM-A514 high strength steels present excellent cavitation erosion resistance properties. The cavitation eroded surface is followed by optical profilometry technique. Determination of mechanical properties and examinations of the eroded surfaces of the samples have also been carried out in order to identify the erosion mechanisms involved in the degradation of these kinds of materials.

Tôn-Thât, L.

2010-08-01

74

Dynamic simulation of dual-speed wind turbine generation  

SciTech Connect

Induction generators have been used since the early development of utility-scale wind turbine generation. An induction generator is the generator of choice because of its ruggedness, and low cost. With an induction generator, the operating speed of the wind turbine is limited to a narrow range (almost constant speed). Dual- speed operation can be accomplished by using an induction generator with two different sets of winding configurations or by using two induction generators with two different rated speeds. With single- speed operation, the wind turbine operates at different power coefficients (Cp) as the wind speed varies. The operation at maximum Cp can occur only at a single wind speed. However, if the wind speed varies across a wider range, the operating Cp will vary significantly. Dual-speed operation has the advantage of enabling the wind turbine to operate at near maximum Cp over a wider range of wind-speeds. Thus, annual energy production can be increased. The dual-speed mode may generate less energy than a variable-speed mode; nevertheless, it offers an alternative to capture more energy than single-speed operation. In this paper, dual-speed operation of a wind turbine will be investigated. One type of control algorithm for dual- speed operation is proposed. Results from a dynamic simulation will be presented to show how the control algorithm works and how power, current and torque of the system vary as the wind turbine is exposed to varying wind speeds.

Muljadi, E.; Butterfield, C.P.

1996-10-01

75

Hydraulics.  

ERIC Educational Resources Information Center

|This curriculum guide contains a course in hydraulics to train entry-level workers for automotive mechanics and other fields that utilize hydraulics. The module contains 14 instructional units that cover the following topics: (1) introduction to hydraulics; (2) fundamentals of hydraulics; (3) reservoirs; (4) lines, fittings, and couplers; (5)…

Decker, Robert L.; Kirby, Klane

76

9. PENSTOCK RECEIVER AND ISOLATION VALVE, WITH #4 GENERATOR TURBINE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. PENSTOCK RECEIVER AND ISOLATION VALVE, WITH #4 GENERATOR TURBINE SHUTOFF VALVE IN FOREGROUND. VIEW TO SOUTHEAST. - Santa Ana River Hydroelectric System, SAR-1 Powerhouse, Redlands, San Bernardino County, CA

77

Investigation of Excitation Control for Wind-Turbine Generator Stability.  

National Technical Information Service (NTIS)

High speed horizontal axis wind turbine generators with blades on the downwind side of the support tower require special design considerations to handle disturbances introduced by the flow wake behind the tower. Experiments and analytical analyses were ma...

V. D. Gebben

1977-01-01

78

5. POWERHOUSE, PELTONFRANCIS TURBINES (GENERATORS) UNITS NOS. 1 AND 2 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. POWERHOUSE, PELTON-FRANCIS TURBINES (GENERATORS) UNITS NOS. 1 AND 2 WITH REGULATOR PANEL AT LEFT AND GATE VALVE IN CENTER FOREGROUND - Yosemite Hydroelectric Power Plant, Highways 120 & 140, Yosemite Village, Mariposa County, CA

79

100. View of generator room in powerhouse; turbine unit no. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

100. View of generator room in powerhouse; turbine unit no. 2 is to the right, looking southeast. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

80

107. View of generator room in powerhouse; turbine unit no. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

107. View of generator room in powerhouse; turbine unit no. 4 is in foreground; looking north. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

81

106. View of generator room in powerhouse; turbine unit no. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

106. View of generator room in powerhouse; turbine unit no. 4 is in foreground; looking northwest. Photo by Jet Lowe, HAER, 1989. - Puget Sound Power & Light Company, White River Hydroelectric Project, 600 North River Avenue, Dieringer, Pierce County, WA

82

17. TOP OF TURBINE LOOKING NORTHWEST. SHAFT TO GENERATOR IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

17. TOP OF TURBINE LOOKING NORTHWEST. SHAFT TO GENERATOR IN CENTER. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

83

15. VIEW SOUTHEAST OF HYDROELECTRIC GENERATING FACILITY SHOWING TURBINE PIT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

15. VIEW SOUTHEAST OF HYDROELECTRIC GENERATING FACILITY SHOWING TURBINE PIT TO RIGHT AND POWERHOUSE TO LEFT - Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15, 3 miles South of Selinsgrove, Selinsgrove, Snyder County, PA

84

Grid disturbance response of wind turbines equipped with induction generator and doubly-fed induction generator  

Microsoft Academic Search

This panel paper presents measured and simulated grid disturbance responses of fixed-speed wind turbines equipped with induction generator and variable-speed wind turbines equipped with double-fed induction generator. The measured response of the fixed-speed turbine agrees very well with simulations, while the response of a double-fed induction generator cannot be assessed without detailed knowledge of the control system.

Torbjom Thiringer; Andreas Petersson; T. Petru

2003-01-01

85

EMTP Simulation Model of a Wind Turbine Generator using Induction Generator  

Microsoft Academic Search

This paper presents an EMTP simulation model for the wind turbine generator using induction generator. This model was developed to add the model of a wind turbine portion to the precision model using the standard specification data and operation data of induction generator. It verified that the inrush current at starting and the residual voltage at islanding state were analyzed,

Yoshitaka Tokunaga; Naotaka Iio; Kenichi Tanomura; Hirofumi Shinohara

2003-01-01

86

NEXT GENERATION GAS TURBINE (NGGT) SYSTEMS STUDY  

SciTech Connect

Building upon the 1999 AD Little Study, an expanded market analysis was performed by GE Power Systems in 2001 to quantify the potential demand for an NGGT product. This analysis concluded that improvements to the US energy situation might be best served in the near/mid term (2002-2009) by a ''Technology-Focused'' program rather than a specific ''Product-Focused'' program. Within this new program focus, GEPS performed a parametric screening study of options in the three broad candidate categories of gas turbines: aero-derivative, heavy duty, and a potential hybrid combining components of the other two categories. GEPS's goal was to determine the best candidate systems that could achieve the DOE PRDA expectations and GEPS's internal design criteria in the period specified for initial product introduction, circa 2005. Performance feasibility studies were conducted on candidate systems selected in the screening task, and critical technology areas were identified where further development would be required to meet the program goals. DOE PRDA operating parameters were found to be achievable by 2005 through evolutionary technology. As a result, the study was re-directed toward technology enhancements for interim product introductions and advanced/revolutionary technology for potential NGGT product configurations. Candidate technologies were identified, both evolutionary and revolutionary, with a potential for possible development products via growth step improvements. Benefits were analyzed from two perspectives: (1) What would be the attributes of the top candidate system assuming the relevant technologies were developed and available for an NGGT market opportunity in 2009/2010; and (2) What would be the expected level of public benefit, assuming relevant technologies were incorporated into existing new and current field products as they became available. Candidate systems incorporating these technologies were assessed as to how they could serve multiple applications, both in terms of incorporation of technology into current products, as well as to an NGGT product. In summary, potential program costs are shown for development of the candidate systems along with the importance of future DOE enabling participation. Three main conclusions have been established via this study: (1) Rapid recent changes within the power generation regulatory environment and the resulting ''bubble'' of gas turbine orders has altered the timing and relative significance associated with the conclusions of the ADL study upon which the original DOE NGGT solicitation was based. (2) Assuming that the relevant technologies were developed and available for an NGGT market opportunity circa 2010, the top candidate system that meets or exceeds the DOE PRDA requirements was determined to be a hybrid aero-derivative/heavy duty concept. (3) An investment by DOE of approximately $23MM/year to develop NGGT technologies near/mid term for validation and migration into a reasonable fraction of the installed base of GE F-class products could be leveraged into $1.2B Public Benefit, with greatest benefits resulting from RAM improvements. In addition to the monetary Public Benefit, there is also significant benefit in terms of reduced energy consumption, and reduced power plant land usage.

Unknown

2001-12-05

87

FLOW GENERATED BY PITCHED BLADE TURBINES II: SIMULATION USING ?-? MODEL  

Microsoft Academic Search

Experimental data on average velocity and turbulence intensity generated by pitched blade downflow turbines (PTD) were presented in Part I of this paper. Part II presents the results of the simulation of flow generated by PTDThe standard ?-? model along with the boundary conditions developed in the Part 1 have been employed to predict the flow generated by PTD in

V. V. RANADE; J. B. JOSHI; A. G. MARATHE

1989-01-01

88

A Permanent Magnet Generator for Small Scale Wind Turbines  

Microsoft Academic Search

This paper describes the development of a permanent magnet generator for small scale wind turbines. The generator has been designed for ease of manufacture so that it can be made by small mechanical engineering companies with limited electrical engineering knowledge. The generator has also been designed to have no cogging torque so that it can be used with all horizontal

J. R. Bumby; N. Stannard; R. Martin

2007-01-01

89

Hydraulics.  

ERIC Educational Resources Information Center

|These instructional materials provide an orientation to hydraulics for use at the postsecondary level. The first of 12 sections presents an introduction to hydraulics, including discussion of principles of liquids, definitions, liquid flow, the two types of hydraulic fluids, pressure gauges, and strainers and filters. The second section…

Engelbrecht, Nancy; And Others

90

Design and Performance Study of an Ocean Current Turbine Generator  

NASA Astrophysics Data System (ADS)

The relatively constant flow of the ocean currents carries large amounts of energy that can be captured and converted to a usable form. In this paper, design and performance simulation of a horizontal axial ocean current turbine (OCT) are studied. Also, study on varying the turbine duct housing design parameters and a series of simulation analyses were performed. Our model simulations with and without the turbine duct housing design were compared with existing literature results and very good agreements were obtained. The results also showed that unducted ocean current turbine power output is proportional to the cube of the current speed. Therefore, if we can increase the flow rate, the ocean current turbine generator performance is expected to be greatly enhanced. By adding the turbine duct housing, under the current velocity of 1 and 2 m/s, parametric studies including the duct housing type, duct entrance area, tilt angle, and duct length-to-diameter ratio are performed. After obtaining the optimized set of design values for our current design, a complete system analysis of the ocean current turbine generator was performed to provide future design guidelines.

Chiang, Hsiao-Wei D.; Lin, Chen-Yin; Hsu, Chih-Neng

2013-09-01

91

Flow Characteristics in an Augmentation Channel of a Direct Drive Turbine for Wave Power Generation  

NASA Astrophysics Data System (ADS)

Cross flow turbine also known as Banki turbine, is a hydraulic turbine that may be classified as an impulse turbine. At present it has gained interest in small and low head establishments because of its simple structure, cost effectiveness and low maintenance. Therefore, the present paper expands on this idea and aims at implementing the Direct Drive Turbine (DDT) for wave power generation. Wave power has enormous amount of energy which is environmentally friendly, renewable and can be exploited to satisfy the energy needs. A Numerical Wave Tank (NWT) was used to simulate the sea conditions and after obtaining desired wave properties; the augmentation channel plus the front guide nozzle and rear chamber were integrated to the NWT. The augmentation channel consisted of a front nozzle, rear nozzle and an internal fluid region which represented the turbine housing. The front and rear nozzle were geometrically identical. Two different nozzle configurations were studied; spiral rear wall type and a straight rear wall type. In addition to this, the effect of front guide nozzle divergent angle was also studied. The general idea is to investigate how different augmentation channel geometry and front guide nozzle divergent angle affects the flow, the water horse power and the first stage (primary stage) energy conversion. The analysis was performed using a commercial CFD code of the ANSYS-CFX. The results of the flow in an augmentation channel of the Direct Drive Turbine in oscillating flow for all the cases are presented by means of pressure and velocity vectors. The water horse power (WHP) and first stage energy conversion for the models are also presented.

Prasad, Deepak; Zullah, Mohammed Asid; Choi, Young-Do; Lee, Young-Ho

2010-06-01

92

Electrical power systems (Guatemala). Small generators and turbines, March 1992. Export trade information  

SciTech Connect

In Guatemala the market for all types of electrical power generator systems, including parts and accessories, increased from US $19.5 million in 1990 to US $25.5 in 1991 (up 30.7 percent). Guatemalan import statistics list within this category all types of turbines and hydraulic electric power generating engines, regardless of their size or power generating capacity. Also included in the study are all types of electrical generators that are moved or operated by an attached fuel powered engine. The outlook for future market demand for electrical power generating systems looks promising for the next three or four years, with an estimated average increase of 7.3 percent per year.

Not Available

1992-03-01

93

Research on the hydraulic turbine vertical vibration power flow in the head cover system  

NASA Astrophysics Data System (ADS)

On the basis of the prior models about the vertical vibration of the hydraulic vibration source, this research introduced a sub-system—head cover. Head cover is one of the main paths when vibration is transferred from the water vibration source to the stable structure. This essay aims to analyze the hydraulic turbine vertical vibration power flow in the head cover system. The research is based on the power flow theory and the probability perturbation method; meanwhile, it considered on the reciprocal coupling effect of the water machine parts and power house structure, etc. Therefore, the results of can clearly provide the random power flow of the vibration transfer path system, which including the head cover system, in frequency domain by given of some uncertain factors in one project. In conclusions, the research provide an overall analysis on the hydropower station vertical vibration transfer path; and it suggest some simplified and efficient solutions in the analysis on the vibration path with some random parameters.

Zhi, B. P.; Ma, Z. Y.

2012-11-01

94

Vertical wind turbine power generating tower  

SciTech Connect

The tower comprises a base supported on a framework which mounts a wind powered turbine having a vertical axis of rotation. Air is channeled to the turbine rotor to cause counterclockwise rotation thereof by upper and lower wind deflectors. The wind deflectors include channels which cause the oncoming air to swirl in a counterclockwise motion into the rotor transmitting energy thereto. The vertical struts of the framework are also configured so as to deflect the oncoming air into the rotor in a counterclockwise direction. The rotor itself comprises columns of vertically spaced, radially extending scoops and radially extending curved blades to ensure highly efficient energy conversion. The rotor is formed with no center shaft to allow free flow of air therethrough.

Retz, P.

1982-12-28

95

Wind turbine generator trends for site-specific tailoring  

NASA Astrophysics Data System (ADS)

Turbine optimization for specific wind regimes and climate conditions is becoming more common as the market expands into new territories (offshore, low-wind regimes) and as technology matures. Tailoring turbines for specific sites by varying rotor diameter, tower height and power electronics may be a viable technique to make wind energy more economic and less intermittent. By better understanding the wind resource trends and evaluating important wind turbine performance parameters such as specific power (ratio of rated power and rotor swept area), developers and operators can optimize plant output and better anticipate operational impacts. This article presents a methodology to evaluate site-specific wind data for turbine tailoring. Wind characteristics for the Tehachapi wind resource area in California were utilized for this study. These data were used to evaluate the performance of a range of wind turbine configurations. The goal was to analyse the variations in wind power output for the area, assess the changes in these levels with the time of day and season and determine how turbine configuration affects the output. Wind turbine output was compared with California statewide system electrical demand to evaluate the correlation of the wind resource site with local peak demand loads. A comparison of the commercial value of electricity and corresponding wind generation is also presented using a time-dependent valuation methodology. Copyright

Jackson, K.; van Dam, C. P.; Yen-Nakafuji, D.

2005-10-01

96

Composite rotor blades for wind turbine generators  

Microsoft Academic Search

The materials, techniques, and methods used to construct a 150 ft test blade, two 31 ft blades for a 40 kW WECS, and rotor blades for the Mod-1 wind turbine are described. Considerations of strength, stiffness, and mass distributions, as well as cost, led to the choice of filament wound fiberglass\\/epoxy material using transverse filament tape which has structural fibers

W. D. Weigel

1981-01-01

97

Design of Gear-Less Wind Turbine Variable Speed Generators.  

National Technical Information Service (NTIS)

If the use of gear boxes in grid connected wind turbines could be eliminated with convertor connected low speed generators, a reduction of cost and weight of the plant could be possible. Studies of these generators have been performed within the Swedish w...

J. Hylander S. von Zweygbergk S. Engstroem

1986-01-01

98

Gas turbine and generator controls: A user prospective  

Microsoft Academic Search

In this paper, the gas turbine and generator controls are discussed with the aim to develop intuitive user understanding. The paper discusses control issues like droop and isochronous modes of governor control and excitation system voltage control. Also, the subject of islanding, generator capability curve, limiters, PSS and synchronization are discussed. Furthermore, to clear confusions, basics of excitation system like

Salah I. Al-Majed; Saudi Aramco; Tadaki Kakimoto

2011-01-01

99

MOD1 wind turbine generator program status report  

Microsoft Academic Search

The paper reports a status of the MOD-1 wind turbine generator program for the first megawatt class machine WTG. The MOD-1 WTG is described with attention drawn to its rotor design, drive train, power generation\\/control system, nacelle structure, yaw drive, weight, and tower and ground equipment. WTG performance and economics are considered along with factory assembly and test, site preparation,

R. H. Poor

1979-01-01

100

Pitch-controlled variable-speed wind turbine generation  

Microsoft Academic Search

This paper covers the operation of variable-speed wind turbines with pitch control. The system the authors considered is controlled to generate maximum energy while minimizing loads. The maximization of energy was only carried out on a static basis and only drive train loads were considered as a constraint. In low to medium wind speeds, the generator and the power converter

Eduard Muljadi; C. P. Butterfield

2001-01-01

101

Permanent Magnet Synchronous Generator Cascade for Wind Turbine Application  

Microsoft Academic Search

This paper proposes an energy conversion system for a wind turbine comprising a grid connected permanent magnet synchronous generator and a 20% rated series converter located in its star point. It models the complete system and focuses on the series converter control whose primary function is the active damping of the generator. In addition, this paper addresses the topic of

Stevan Grabic; Nikola Celanovic; Vladimir A. Katic

2008-01-01

102

Advanced Wind Turbine Program Next Generation Turbine Development Project: June 17, 1997--April 30, 2005  

SciTech Connect

This document reports the technical results of the Next Generation Turbine Development Project conducted by GE Wind Energy LLC. This project is jointly funded by GE and the U.S. Department of Energy's National Renewable Energy Laboratory.The goal of this project is for DOE to assist the U.S. wind industry in exploring new concepts and applications of cutting-edge technology in pursuit of the specific objective of developing a wind turbine that can generate electricity at a levelized cost of energy of $0.025/kWh at sites with an average wind speed of 15 mph (at 10 m height).

GE Wind Energy, LLC

2006-05-01

103

The impact of inlet angle and outlet angle of guide vane on pump in reversal based hydraulic turbine performance  

NASA Astrophysics Data System (ADS)

In this paper, in order to research the impact of inlet angle and outlet angle of guide vane on hydraulic turbine performance, a centrifugal pump in reversal is adopted as turbine. A numerical simulation method is adopted for researching outer performance and flow field of turbine. The results show: inlet angle has a crucial role to turbine, to the same flow, there is a noticeable decline for the efficiency and head of turbine with the inlet angle increases. At the best efficiency point(EFP),to a same inlet angle, when the inlet angle greater than inlet angle, velocity circulation in guide vane outlet decreases, which lead the efficiency of turbine to reduce, Contrarily, the efficiency rises. With the increase of inlet angle and outlet angle, the EFP moves to the big flow area and the uniformity of pressure distribution becomes worse. The paper indicates that the inlet angle and outlet angle have great impact on the turbine performance, and the best combination exists for the inlet angle and outlet angle of the guide vane.

Shi, F. X.; Yang, J. H.; Wang, X. H.; Zhang, R. H.; Li, C. E.

2012-11-01

104

Modeling of Turbine Cycle Using Neuro-fuzzy Based Approach to Predict Turbine-Generator Output for Nuclear Power Plants  

Microsoft Academic Search

Due to the very complex sets of component systems, interrelated thermodynamic processes and seasonal change in operating conditions, it is relatively difficult to find a suitable model for turbine cycle of nuclear power plants (NPPs). This paper deals with the modeling of turbine cycle to predict turbine-generator output using an adaptive neuro-fuzzy inference system (ANFIS) for Unit 1 of Kuosheng

Yea-Kuang Chan; Jyh-Cherng Gu

2012-01-01

105

Electrical Generation Aspects of Wind Turbine Operation.  

National Technical Information Service (NTIS)

Workshop proceedings presented cover advantages and disadvantages of variable versus fixed speed generator operation, rectifier inverter systems, synchronous generators with static frequency conversion, variable speed induction generators and direct coupl...

1987-01-01

106

Calculation of guaranteed mean power from wind turbine generators  

NASA Astrophysics Data System (ADS)

A method for calculating the 'guaranteed mean' power output of a wind turbine generator is proposed. The term 'mean power' refers to the average power generated at specified wind speeds during short-term tests. Correlation of anemometers, the method of bins for analyzing non-steady data, the PROP Code for predicting turbine power, and statistical analysis of deviations in test data from theory are discussed. Guaranteed mean power density for the Clayton Mod-OA system was found to be 8 watts per square meter less than theoretical power density at all power levels, with a confidence level of 0.999. This amounts to 4 percent of rated power.

Spera, D. A.

1981-05-01

107

Hydraulics.  

ERIC Educational Resources Information Center

|Designed for use in courses where students are expected to become proficient in the area of hydraulics, including diesel engine mechanic programs, this curriculum guide is comprised of fourteen units of instruction. Unit titles include (1) Introduction, (2) Fundamentals of Hydraulics, (3) Reservoirs, (4) Lines, Fittings, and Couplers, (5) Seals,…

Decker, Robert L.

108

Pressure probe with five embedded flush-mounted sensors: unsteady pressure and velocity measurements in hydraulic turbine model  

NASA Astrophysics Data System (ADS)

The unsteady five-hole Pitot tube, with embedded flush-mounted sensors, provides one of the most advanced experimental techniques in fluid mechanics stemming from Pitot tube. This instrument enables the measurement of both unsteady pressures and instantaneous three-dimensional velocity vectors. The present paper focuses on the methodology and use of this type of probe in hydraulic turbines. Different fluctuating phenomena can be monitored, providing reliable estimates regarding amplitude and frequency. The probe is particularly advantageous for applications when the flow exhibits large angular fluctuation. In such cases, even the mean values must be validated using unsteady measurements. The calibration method and the validation of the unsteady measurements are presented through three different hydraulic turbine models.

Duquesne, Pierre; Ciocan, Gabriel Dan; Aeschlimann, Vincent; Bombenger, Antoine; Deschênes, Claire

2012-12-01

109

Pressure probe with five embedded flush-mounted sensors: unsteady pressure and velocity measurements in hydraulic turbine model  

NASA Astrophysics Data System (ADS)

The unsteady five-hole Pitot tube, with embedded flush-mounted sensors, provides one of the most advanced experimental techniques in fluid mechanics stemming from Pitot tube. This instrument enables the measurement of both unsteady pressures and instantaneous three-dimensional velocity vectors. The present paper focuses on the methodology and use of this type of probe in hydraulic turbines. Different fluctuating phenomena can be monitored, providing reliable estimates regarding amplitude and frequency. The probe is particularly advantageous for applications when the flow exhibits large angular fluctuation. In such cases, even the mean values must be validated using unsteady measurements. The calibration method and the validation of the unsteady measurements are presented through three different hydraulic turbine models.

Duquesne, Pierre; Ciocan, Gabriel Dan; Aeschlimann, Vincent; Bombenger, Antoine; Deschênes, Claire

2013-01-01

110

Coordinate Control of Wind Turbine and Battery in Wind Turbine Generator System  

NASA Astrophysics Data System (ADS)

Battery is installed for with wind power generator to level the output power fluctuations, since output power fluctuations of wind power generator are large. However, if large battery is installed in wind turbine generator, the capital cost for wind power system will increase. Hence, the smallest size of battery should be preferable to save the capital cost. In this paper, we propose a methodology for controlling combined system output power and storage energy capacity of battery system. The system consists of wind turbine generator and battery energy storage system. The generated power fluctuation in low and high frequency range are smoothed by pitch angle control and battery charge or discharge. This coordinated control reduces the rated battery capacity and windmill blade stress. In our proposed method, we apply H? control theory to achieve good response and robustness. The effectiveness of the proposed control system is simulated.

Senjyu, Tomonobu; Kikunaga, Yasuaki; Tokudome, Motoki; Uehara, Akie; Yona, Atsushi; Funabashi, Toshihisa

111

Methods and apparatus for cooling wind turbine generators  

DOEpatents

A wind turbine generator includes a stator having a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis. A rotor is rotatable about the generator longitudinal axis, and the rotor includes a plurality of magnetic elements coupled to the rotor and cooperating with the stator windings. The magnetic elements are configured to generate a magnetic field and the stator windings are configured to interact with the magnetic field to generate a voltage in the stator windings. A heat pipe assembly thermally engaging one of the stator and the rotor to dissipate heat generated in the stator or rotor.

Salamah, Samir A. (Niskayuna, NY); Gadre, Aniruddha Dattatraya (Rexford, NY); Garg, Jivtesh (Schenectady, NY); Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Alplaus, NY); Carl, Jr., Ralph James (Clifton Park, NY)

2008-10-28

112

Design and experimental validation of the inlet guide vane system of a mini hydraulic bulb-turbine  

Microsoft Academic Search

The paper presents a fast design method for the inlet guide vanes of low-cost mini hydraulic bulb turbines. The guide vanes are positioned between two conical surfaces with a common vertex and have constant thickness distribution, except close to the leading and the trailing edges. The conical-walled inlet guide vane row is designed using a quasi-three-dimensional calculation method, by prescribing

L. M. C. Ferro; L. M. C. Gato; A. F. O. Falcão

2010-01-01

113

Wind turbine generator with improved operating subassemblies  

DOEpatents

A wind turbine includes a yaw spring return assembly to return the nacelle from a position to which it has been rotated by yawing forces, thus preventing excessive twisting of the power cables and control cables. It also includes negative coning restrainers to limit the bending of the flexible arms of the rotor towards the tower, and stop means on the rotor shaft to orient the blades in a vertical position during periods when the unit is upwind when the wind commences. A pendulum pitch control mechanism is improved by orienting the pivot axis for the pendulum arm at an angle to the longitudinal axis of its support arm, and excessive creep is of the synthetic resin flexible beam support for the blades is prevented by a restraining cable which limits the extent of pivoting of the pendulum during normal operation but which will permit further pivoting under abnormal conditions to cause the rotor to stall.

Cheney, Jr., Marvin C. (24 Stonepost Rd., Glastonbury, CT 06033)

1985-01-01

114

Wind turbine generator with improved operating subassemblies  

SciTech Connect

A wind turbine includes a yaw spring return assembly to return the nacelle from a position to which it has been rotated by yawing forces, thus preventing excessive twisting of the power cables and control cables. It also includes negative coning restrainers to limit the bending of the flexible arms of the rotor towards the tower, and stop means on the rotor shaft to orient the blades in a vertical position during periods when the unit is upwind when the wind commences. A pendulum pitch control mechanism is improved by orienting the pivot axis for the pendulum arm at an angle to the longitudinal axis of its support arm, and excessive creep is of the synthetic resin flexible beam support for the blades is prevented by a restraining cable which limits the extent of pivoting of the pendulum during normal operation but which will permit further pivoting under abnormal conditions to cause the rotor to stall.

Cheney Jr., M. C.

1985-10-08

115

Site matching of wind turbine generators: a case study  

Microsoft Academic Search

Site matching of wind turbine generators is investigated based on the appropriate selection of statistical models and means of wind speed data. The wind speed means are computed using arithmetic mean, root mean square and cubic mean cuberoot. Wind speed frequency distributions are modelled using Weibull and Rayleigh probability density functions. Wind speed data of an existing wind power station,

S. H. Jangamshetti; V. G. Rau

1999-01-01

116

Dynamic modeling of doubly fed induction generator wind turbines  

Microsoft Academic Search

It is now recognized that many large wind farms will employ doubly fed induction generator (DFIG) variable speed wind turbines. A number of such wind farms are already in operation and more are planned or under construction. With the rising penetration of wind power into electricity networks, increasingly comprehensive studies are required to identify the interaction between the wind farm(s)

Janaka B. Ekanayake; Lee Holdsworth; XueGuang Wu; Nicholas Jenkins

2003-01-01

117

Sensorless Control of Permanent Magnet Generator in Wind Turbine Application  

Microsoft Academic Search

This paper discusses a new and simple speed estimator, to be used by a permanent magnet generator, for maximum power tracking in a small size variable speed wind turbine. Moreover, a vector control approach is introduced to control the output voltage and current of a single-phase voltage source inverter, such that the active and reactive power can be controlled independently.

R. Esmaili; Longya Xu

2006-01-01

118

Wind data requirements for wind turbine generator design  

Microsoft Academic Search

The statistical methods of wind modeling for the design of tall masts, buildings, towers, and bridges are shown to be effective for the analysis of wind loads on wind turbine generators (WTG). The wind velocity profile and turbulence is defined as the instantaneous deviations from the short term mean wind speed, and is capable of reducing the fatigue life of

U. Hassan

1980-01-01

119

11. VIEW NORTHEAST OF HYDROELECTRIC GENERATING FACILITY SHOWING TURBINE FIT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. VIEW NORTHEAST OF HYDROELECTRIC GENERATING FACILITY SHOWING TURBINE FIT WITH INTAKE TRASH RACK AT WATER LINE AND SWITCH GEAR ON TOP - Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15, 3 miles South of Selinsgrove, Selinsgrove, Snyder County, PA

120

Comparative analysis of three methods to generate soil hydraulic functions  

Microsoft Academic Search

An accurate determination of the soil hydraulic functions is crucial for using soil water simulation models. The purpose of this study is to compare different methods to estimate hydraulic properties and their effects on the simulation of soil water movement. Soil water retention and hydraulic conductivity functions were either measured in the laboratory (core method) and in the field (instantaneous

A. Mermoud; D. Xu

2006-01-01

121

Study on parameter estimation of hydraulic synchronous generator based on synchronous phasor measurement unit  

Microsoft Academic Search

The premise of decoupling parameter estimation of generator to d-axis and q-axis is the rotor angle which can be measured. It applies the information obtained synchronous phasor measurement unit (PMU) to hydraulic generator parameter estimation. When the rotor angle can be obtained, it introduces ant colony optimization algorithm which can optimize the parameters of hydraulic generator described the type of

Lixia Sun; Ping Qu; Yunhua Gao; Lei Wu

2008-01-01

122

Development of an axial microturbine for a portable gas turbine generator  

Microsoft Academic Search

A miniature gas turbine is under development with the aim of generating electrical energy from fuel. This system consists of a compressor, combustion chamber, turbine and generator. The turbine is a single-stage axial impulse turbine (Laval turbine) with a rotor diameter of 10 mm, made of stainless steel using die-sinking electro-discharge machining. It has been tested with compressed air to

Jan Peirs; Dominiek Reynaerts; Filip Verplaetsen

2003-01-01

123

Exposure of aircraft maintenance technicians to organophosphates from hydraulic fluids and turbine oils: A pilot study.  

PubMed

Hydraulic fluids and turbine oils contain organophosphates like tricresyl phosphate isomers, triphenyl phosphate and tributyl phosphate from very small up to high percentages. The aim of this pilot study was to determine if aircraft maintenance technicians are exposed to relevant amounts of organophosphates. Dialkyl and diaryl phosphate metabolites of seven organophosphates were quantified in pre- and post-shift spot urine samples of technicians (N=5) by GC-MS/MS after solid phase extraction and derivatization. Pre- and post shift values of tributyl phosphate metabolites (dibutyl phosphate (DBP): median pre-shift: 12.5?g/L, post-shift: 23.5?g/L) and triphenyl phosphate metabolites (diphenyl phosphate (DPP): median pre-shift: 2.9?g/L, post-shift: 3.5?g/L) were statistically higher than in a control group from the general population (median DBP: <0.25?g/L, median DPP: 0.5?g/L). No tricresyl phosphate metabolites were detected. The aircraft maintenance technicians were occupationally exposed to tributyl and triphenyl phosphate but not to tricresyl phosphate, tri-(2-chloroethyl)- and tri-(2-chloropropyl)-phosphate. Further studies are necessary to collect information on sources, routes of uptake and varying exposures during different work tasks, evaluate possible health effects and to set up appropriate protective measures. PMID:23597959

Schindler, Birgit Karin; Koslitz, Stephan; Weiss, Tobias; Broding, Horst Christoph; Brüning, Thomas; Bünger, Jürgen

2013-03-21

124

Composite rotor blades for wind turbine generators  

NASA Astrophysics Data System (ADS)

The materials, techniques, and methods used to construct a 150 ft test blade, two 31 ft blades for a 40 kW WECS, and rotor blades for the Mod-1 wind turbine are described. Considerations of strength, stiffness, and mass distributions, as well as cost, led to the choice of filament wound fiberglass/epoxy material using transverse filament tape which has structural fibers running across the width of the tape. A number of 90 deg windings were added to the rotor after tape winding to provide compaction and hoop strength. Curing comprised five hours at 180 F. The Mod-1 blades were required to match the steel blades in weight, stiffness, deflection, and frequencies. The finished product weighed 20,000 lb and featured a metal tip cap and braided wire trailing edge strap for lightning protection. The 40 kW was a NACA 23018 in the center and 23012 at the tip, while the Mod-1 blade was a NACA 23025 in the center and 23015 at the tip.

Weigel, W. D.

125

Doubly fed induction generator systems for wind turbines  

Microsoft Academic Search

This article shows that adjustable speed generators for wind turbines are necessary when output power becomes higher than 1 MW. The doubly fed induction generator (DFIG) system presented in this article offers many advantages to reduce cost and has the potential to be built economically at power levels above 1.5 MW, e.g., for off-shore applications. A dynamic model of the

S. Muller; M. Deicke; R. W. De Doncker

2002-01-01

126

Simulation of Doubly Fed Induction Generator Wind Turbines  

Microsoft Academic Search

In this paper the basic operational characteristics of a variable speed wind turbine with doubly fed induction generator are investigated using the software Mathlab\\/Simulink, ed.7.0.1. Detailed mathematical model of the aerodynamic system is described and analysis of the steady state operational characteristics of the doubly fed induction generator is included. A specific control strategy is implemented according to the vector

I. Margaris; A. Tsouchnikas; N. Hatziargyriou

127

Lightning-accommodation systems for wind-turbine-generator safety  

SciTech Connect

Wind turbine generators are being evaluated as alternate sources of electrical energy. The wind turbine safety program identifies the naturally occurring lightning phenomenon as a hazard with the potential to cause loss of program objectives, injure personnel, damage system instrumentation, structure or support equipment and facilities. The Lewis Research Center is responsible for the development of large wind turbines in the 100 kW to multimegawatt size range. In support of this program, several candidate methods of lightning accommodation for each blade have been designed, analyzed, and tested by submitting sample blade sections to simulated lightning. At the present time, lightning accommodation systems for composite blades are being individually developed. Their effectiveness is evaluated by submitting the systems to simulated lightning strikes. The test data are analyzed and system designs are reviewed on the basis of the analysis. This activity is directed at defining design and procedural constraints, requirements for safety devices and warning methods, special procedures, protective equipment and personnel training.

Bankaitis, H.

1981-01-01

128

Wind Turbine Generator Interaction With Diesel Generators on an Isolated Power System  

Microsoft Academic Search

The Block Island Power Company (BIPCO), on Block Island, Rhode Island, operates an isolated electric power system consisting of diesel generation and an experimental wind turbine. The 150-kW wind turbine, designated MOD-OA by the U. S. Department of Energy is typically operated in parallel with two diesel generators to serve an average winter load of 350 kW. As part of

G. W. Scott; V. F. Wilreker; R. K. Shaltens

1984-01-01

129

Integration of Wind-Turbine Generators (WTGs) into Hybrid Distributed Generation Systems in Extreme Northern Climates  

Microsoft Academic Search

This paper discusses the effects of integrating wind-turbine generators (WTGs) into hybrid distributed generation systems in extreme northern climates. The hybrid performance analysis tool presented incorporates the added features of dynamic modeling and the graphical user interface available in MATLAB™ Simulink. The model currently consists of a diesel-electric generator, a battery storage bank, and WTGs connected to a common grid

RICHARD W. WIES; RONALD A. JOHNSON; ASHISH N. AGRAWAL

2005-01-01

130

Hydraulics  

NSDL National Science Digital Library

These interactive learning objects, created by instructors from Fox Valley Technical College and other colleges in the Wisconsin Technical College program, focus on concepts that cover a broad-based electromechanical program. Here visitors will find learning objects in Hydraulics with over 25 lessons in Actuators, Relief Valves, Basic Concepts, and Directional Control Valves.

2011-01-03

131

Exposure to airborne organophosphates originating from hydraulic and turbine oils among aviation technicians and loaders.  

PubMed

This study describes the potential for occupational exposure to organophosphates (OPs) originating from turbine and hydraulic oils, among ground personnel within the aviation industry. The OPs tri-n-butyl phosphate (TnBP), dibutyl phenyl phosphate (DBPP), triphenyl phosphate (TPP) and tricresyl phosphate (TCP) have been emphasized due to their use in such oils. Oil aerosol/vapor and total volatile organic compounds (tVOCs) in air were also determined. In total, 228 and 182 OPs and oil aerosol/vapor samples from technician and loader work tasks during work on 42 and 21 aircrafts, respectively, were collected in pairs. In general, the measured exposure levels were below the limit of quantification (LOQ) for 84%/98% (oil aerosol) and 82%/90% (TCP) of the samples collected during technician/loader work tasks. The air concentration ranges for all samples related to technician work were

Solbu, Kasper; Daae, Hanne Line; Thorud, Syvert; Ellingsen, Dag Gunnar; Lundanes, Elsa; Molander, Paal

2010-10-14

132

Biomass gasification for gas turbine-based power generation  

SciTech Connect

The Biomass Power Program of the US Department of Energy (DOE) has as a major goal the development of cost-competitive technologies for the production of power from renewable biomass crops. The gasification of biomass provides the potential to meet this goal by efficiently and economically producing a renewable source of a clean gaseous fuel suitable for use in high-efficiency gas turbines. This paper discusses the development and first commercial demonstration of the Battelle high-throughput gasification process for power generation systems. Projected process economics are presented along with a description of current experimental operations coupling a gas turbine power generation system to the research scale gasifier and the process scaleup activities in Burlington, Vermont.

Paisley, M.A.; Anson, D. [Battelle, Columbus, OH (United States)

1998-04-01

133

Site matching of wind turbine generators: A case study  

SciTech Connect

Site matching of wind turbine generators is investigated based on appropriate selection of statistical models and means of wind speed data. The wind speed means are computed using arithmetic mean, root mean square and cubic mean cuberoot. Wind Speed frequency distributions are modeled using Weibull and Rayleigh probability density functions. Wind speed data of an existing wind power station, located at Kappadagudda, Karnataka, India, is used for computational purposes. The analytically obtained capacity factors are validated by comparing with the actual capacity factors obtained at Kappadagudda. It is observed that the capacity factors computed from the Weibull statistical model using cubic mean of wind speed data fairly match the actual capacity factors obtained from Kappadagudda wind power station. Various commercially available wind turbine generators are used for site matching study. The model described in the paper is useful for planning of wind power stations as it can be applied for accurate assessment of wind power potential at a site.

Jangamshetti, S.H.; Rau, V.G.

1999-12-01

134

Control of a Wind Turbine with a Doubly Fed Induction Generator after Transient Failures  

Microsoft Academic Search

Large Wind turbines are often equipped with doubly fed induction generators. In numerous papers the stability problems are pointed out and there are also many papers describing control strategies for wind turbines equipped with doubly fed induction generators. This paper focuses on stability after a transient failure for wind turbines equipped with a doubly fed induction machine, some of the

Jorun I. Marvik; Torstein Bjørgum; Bjarne I. Næss; Tore M. Undeland; Terje Gjengedal

135

Dynamic modelling of a wind turbine with doubly fed induction generator  

Microsoft Academic Search

As a result of increasing environmental concern, more and more electricity is generated from renewable sources. One way of generating electricity from renewable sources is to use wind turbines. A tendency to erect more and more wind turbines can be observed. As a result of this, in the near future wind turbines may start to influence the behaviour of electrical

J. G. Slootweg; H. Polinder; W. L. Kling

2001-01-01

136

Axial flux, modular, permanent-magnet generator with a toroidal winding for wind turbine applications  

Microsoft Academic Search

Permanent-magnet generators have been used for wind turbines for many years. Many small wind turbine manufacturers use direct-drive permanent-magnet generators. For wind turbine generators, the design philosophy must cover the following characteristics: low cost; light weight; low speed; high torque; and variable speed generation. The generator is easy to manufacture and the design can be scaled up for a larger

E. Muljadi; C. P. Butterfield; Yih-Huei Wan

1998-01-01

137

A hybrid generation system using variable speed wind turbines and diesel units  

Microsoft Academic Search

The paper presents a study of a power system consisting of wind turbines and diesel generation units. In the study, a direct drive modular permanent magnet generator is used for the wind turbine and a normal permanent magnet generator is used for the diesel generation unit. Both types of generation units are connected to the load via power electronic converters

Z. Chen; Y. Hu

2003-01-01

138

RTDS-based real time simulations of grid-connected wind turbine generator systems  

Microsoft Academic Search

This paper presents the modeling and analysis of grid-connected wind turbine systems using real time digital simulator (RTDS). The different modeled systems of wind turbine generator systems (WTGS) such as permanent magnet synchronous generator (PMSG), induction generator (IG), synchronous generator (SG) and doubly fed induction generator (DFIG) are simulated. Three control schemes for 3 MW WTGSs of squirrel cage induction

Gyeong-Hun Kim; Young-Ju Kim; In-Keun Yu; Byeong-Mun Song

2010-01-01

139

Hydropower Stations. Generating Equipment and Its Installation.  

National Technical Information Service (NTIS)

The first part of the book describes hydropower sets. Fundamental concepts concerning the use of hydraulic energy are explained, as are the general theory of hydraulic turbines, their layout and design, the design of hydropower generators, governors, and ...

A. N. Goncharov

1975-01-01

140

Life extension of gas turbines used for power generation  

SciTech Connect

Gas turbines have traditionally been used by electric utilities to supplement generating capacity during peak demand periods. As they age, the utility is faced with the decision of either replacing the units to maintain a reliable source of generating capacity, or extending the life of the units through the use of improved maintenance and monitoring techniques. This paper discusses some of the considerations for extended life operation of gas turbines. To perform this study, actual operating and failure data for 50 Pratt Whitney FT-4 gas turbines were collected from a cooperating utility and analyzed to identify predominant failure causes and components most frequently failed. Failure rates for individual engine modules were calculated as a function of engine age to identify time-dependent trends and their effect on engine reliability. Mean time between failures and engine availability were also determined and are presented. Based on the results of the analysis, potential improvements to operation and maintenance methods were identified and are discussed. 5 refs., 7 figs.

Lofaro, R.; Villaran, M.

1990-01-01

141

Shore Effect Model, Atlantic Generating Station; Hydraulic Model Investigation.  

National Technical Information Service (NTIS)

A distorted-scale hydraulic model investigation was performed to determine the potential effect, if any, of a proposed offshore nuclear power plant on shoreline evolution. Model measurements of current patterns with and without the breakwater were directl...

D. D. Davidson J. H. Barwis R. D. Carver R. W. Whalin

1975-01-01

142

The Thermal Hydraulics of Tube Support Fouling in Nuclear Steam Generators  

Microsoft Academic Search

It is hypothesized that the thermal-hydraulic environment plays a role in the fouling of tube supports in nuclear steam generators. Experiments were performed to simulate the thermal-hydraulic environment near various designs of supports. Pressure loss, local velocity, turbulence intensity, and local void fraction were measured to characterize the effect of the support. Fouling mechanisms specific to supports were inferred from

Helena E. C. Rummens; J. T. Rogers; C. W. Turner

2004-01-01

143

Apparatus and methods of reheating gas turbine cooling steam and high pressure steam turbine exhaust in a combined cycle power generating system  

DOEpatents

In a combined cycle system having a multi-pressure heat recovery steam generator, a gas turbine and steam turbine, steam for cooling gas turbine components is supplied from the intermediate pressure section of the heat recovery steam generator supplemented by a portion of the steam exhausting from the HP section of the steam turbine, steam from the gas turbine cooling cycle and the exhaust from the HP section of the steam turbine are combined for flow through a reheat section of the HRSG. The reheated steam is supplied to the IP section inlet of the steam turbine. Thus, where gas turbine cooling steam temperature is lower than optimum, a net improvement in performance is achieved by flowing the cooling steam exhausting from the gas turbine and the exhaust steam from the high pressure section of the steam turbine in series through the reheater of the HRSG for applying steam at optimum temperature to the IP section of the steam turbine.

Tomlinson, Leroy Omar (Niskayuna, NY); Smith, Raub Warfield (Ballston Lake, NY)

2002-01-01

144

Hydraulic square pressure generator for dynamic calibration of pressure sensors at low frequencies  

NASA Astrophysics Data System (ADS)

A hydraulic square pressure generator with a unique spool valve has been developed for use in a system to calibrate and evaluate the dynamic characteristics of pressure sensors. This hydraulic square pressure generator generates a hydraulic square pressure with a rapid transient response in the time domain and with abundant harmonics in the frequency domain at low fundamental frequencies, rather than square pressure with poor harmonics at high fundamental frequencies. Its rise time and fundamental frequency are around 32.0 ?s and 5 Hz, respectively, supporting a wide range of dynamic calibration of hydraulic square pressure generators. The sensing cavity in the hydraulic square pressure generator constrains the pressure transient produced by the fluid in the valve and maintains the generated hydraulic square pressure for both tested and reference pressure sensors. Three pressure sensors are calibrated using the hydraulic square pressure produced by the system with an auto-regressive exogenous model. Their transfer functions are obtained by applying the common pole-zero principle to describe their dynamic characteristics in the frequency domain.

Chang, H.; Tsung, T. T.; Jwo, C. S.; Wang, S. H.

2010-08-01

145

Self-excited induction generator for variable-speed wind turbine generation  

SciTech Connect

When an induction generator is connected to a utility bus, the voltage and frequency at the terminal of the generator are the same as the voltage and frequency of the utility. The reactive power needed by the induction generator is supplied by the utility and the real power is returned to the utility. The rotor speed varies within a very limited range, and the reactive power requirement must be transported through a long line feeder, thus creating additional transmission losses. The energy captured by a wind turbine can be increased if the rotor speed can be adjusted to follow wind speed variations. For small applications such as battery charging or water pumping, a stand alone operation can be implemented without the need to maintain the output frequency output of the generator. A self- excited induction generator is a good candidate for a stand alone operation where the wind turbine is operated at variable speed. Thus the performance of the wind turbine can be unproved. In this paper, we examine a self-excited induction generator operated in a stand alone mode. A potential application for battery charging is given. The output power of the generator will be controlled to improve the performance of the wind turbine.

Muljadi, E.; Gregory, B. [National Renewable Energy Lab., Golden, CO (United States); Broad, D. [Colorado State Univ., Fort Collins, CO (United States). Dept. of Electrical Engineering

1996-10-01

146

Transient Stability Analysis of Wind Turbines with Induction Generators Considering Blades and Shaft Flexibility  

Microsoft Academic Search

Increasing levels of wind turbine generation in modern power system is initiating a need for accurate wind generation transient stability models. Long flexible blades maybe have influence on the transient responses of wind generator systems with the increase in size of wind turbines during an electrical fault. In order to exactly analyze the transient stability of wind generator systems, by

H. Li; Z. Chen

2007-01-01

147

Condition Monitoring and Fault Diagnosis of a Wind Turbine with a Synchronous Generator using Wavelet Transforms  

Microsoft Academic Search

Some large wind turbines use a low speed synchronous generator, directly-coupled to the turbine, and a fully rated converter to transform power from the turbine to mains electricity. This paper considers the condition monitoring and diagnosis of mechanical and electrical faults in such a variable speed machine. The application of wavelet transforms is investigated because of the disadvantages of conventional

Wenxian Yang; P. J. Tavner; Michael Wilkinson

148

Performance of a 3 kW wind turbine generator with variable pitch control system  

Microsoft Academic Search

A prototype 3kW horizontal upwind type wind turbine generator of 4m in diameter has been designed and examined under real wind conditions. The machine was designed based on the concept that even small wind turbines should have a variable pitch control system just as large wind turbines, especially in Japan where typhoons occur at least once a year. A characteristic

Baku M. Nagai; Kazumasa Ameku; Jitendro Nath Roy

2009-01-01

149

Normalized power curves as a tool for identification of optimum wind turbine generator parameters  

Microsoft Academic Search

This paper presents a novel method of matching wind turbine generators to a site using normalized power and capacity factor curves. The site matching is based on identifying optimum turbine speed parameters from turbine performance index curve, which is obtained from the normalized curves, so as to yield higher energy production at higher capacity factor. The wind speeds are parameterized

Suresh H. Jangamshetti; V. Guruprasada Rau

2001-01-01

150

Development of a New Procedure for Reliability Modeling of Wind Turbine Generators  

Microsoft Academic Search

A method for determining the impact of wind generation on system reliability is developed. This method combines the effects of wind turbine forced outage rates and varying power output due to wind speed variations. Since individual wind turbines on a windfarm all have an output related to wind speed, each turbine's output cannot be assumed to be independent random variables.

Paul Giorsetto; Kent F. Utsurogi

1983-01-01

151

Evolution of Westinghouse heavy-duty power generation and industrial combustion turbines  

Microsoft Academic Search

This paper reviews the evolution of heavy-duty power generation and industrial combustion turbines in the United States from a Westinghouse Electric Corporation perspective. Westinghouse combustion turbine genealogy began in March of 1943 when the first wholly American designed and manufactured jet engine went on test in Philadelphia, and continues today in Orlando, Florida, with the 230 MW, 501G combustion turbine.

A. J. Scalzo; R. L. Bannister; M. DeCorso; G. S. Howard

1996-01-01

152

Transient support to frequency control from wind turbine with synchronous generator and full converter  

Microsoft Academic Search

The aim of this paper is to describe two regulators for a wind turbine equipped with a synchronous generator and a full converter for the interconnection to the grid. The idea is to extract a temporary amount of power from the wind turbine in order to provide short-term frequency support. The wind turbine model presented is specifically designed to analyse

S. Grillo; M. Marinelli; F. Silvestro; F. Sossan; O. Anaya-Lara; G. Burt

2010-01-01

153

Variable speed wind turbine generator with zero-sequence filter  

DOEpatents

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility. 14 figs.

Muljadi, E.

1998-08-25

154

Variable speed wind turbine generator with zero-sequence filter  

DOEpatents

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.

Muljadi, Eduard (Golden, CO)

1998-01-01

155

Variable Speed Wind Turbine Generator with Zero-sequence Filter  

DOEpatents

A variable speed wind turbine generator system to convert mechanical power into electrical power or energy and to recover the electrical power or energy in the form of three phase alternating current and return the power or energy to a utility or other load with single phase sinusoidal waveform at sixty (60) hertz and unity power factor includes an excitation controller for generating three phase commanded current, a generator, and a zero sequence filter. Each commanded current signal includes two components: a positive sequence variable frequency current signal to provide the balanced three phase excitation currents required in the stator windings of the generator to generate the rotating magnetic field needed to recover an optimum level of real power from the generator; and a zero frequency sixty (60) hertz current signal to allow the real power generated by the generator to be supplied to the utility. The positive sequence current signals are balanced three phase signals and are prevented from entering the utility by the zero sequence filter. The zero sequence current signals have zero phase displacement from each other and are prevented from entering the generator by the star connected stator windings. The zero sequence filter allows the zero sequence current signals to pass through to deliver power to the utility.

Muljadi, Eduard (Golden, CO)

1998-08-25

156

Maximum Power Point Tracking Control of Hydrokinetic Turbine and Low- speed High-Thrust Permanent Magnet Generator Design.  

National Technical Information Service (NTIS)

River-based hydrokinetic turbine power generation systems have been studied to introduce an effective energy flow control method. Hydrokinetic turbine systems share a lot of similarities with wind turbine systems in terms of physical principles of operati...

H. Zhou

2012-01-01

157

Short Circuit Current Contribution for Different Wind Turbine Generator Types  

SciTech Connect

An important aspect of wind power plant (WPP) impact studies is to evaluate the short circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper represents simulation results for short circuit current contribution for different types of WTGs obtained through transient analysis using generic WTG models. The obtained waveforms are analyzed to explain the behavior, such as peak values and rate of decay, of the WTG. The effect of fault types and location, and the effect of the control algorithms of power converters on SC current contribution are investigated. It is shown that the response of the WPP to faults will vary based on the type of the installed WTGs. While in Type 1 and Type 2 WTGs, short circuit current will be determined by the physical characteristics of the induction generator, the contribu-tion of Type 3 and Type 4 WTG will be mostly characterized by the power converters control algorithms which are usually considered proprietary information by the wind turbine manufacturers.

Muljadi, E.; Samaan, Nader A.; Gevorgian, Vahan; Li, Jun; Pasupulati, Subbaiah

2010-09-28

158

Hydraulic waste energy recovery  

SciTech Connect

Water distribution systems are typically a municipality's largest consumer of energy and greatest expense. The water distribution network has varying pressure requirements due to the age of the pipeline and topographical differences. Certain circumstances require installation of pressure reducing devices in the pipeline to lower the water pressure in the system. The consequence of this action is that the hydraulic energy supplied by the high lift or booster pumps is wasted in the process of reducing the pressure. A possible solution to capture the waste hydraulic energy is to install an in-line electricity generating turbine. Energy recovery using in-line turbine systems is an emerging technology. Due to the lack of technical and other relevant information on in-line turbine system installations, questions of constructability and legal issues over the power service contract have yet to be answered. This study seeks to resolve these questions and document the findings so that other communities may utilize this information. 10 figs.

Lederer, C.C.; Thomas, A.H.; McGuire, J.L. (Detroit Buildings and Safety Engineering Dept., MI (USA))

1990-12-01

159

Modeling of the Wind Turbine with a Permanent Magnet Synchronous Generator for Integration  

Microsoft Academic Search

The paper presents the dynamic model and control schemes of a variable speed pitch wind turbine with permanent magnet synchronous generator (PMSG). The model includes a PMSG model, a pitch-angled controlled wind turbine model and a drive train model. The drive train model uses one-mass model to represent the mechanical characteristics of the generator set. The generator model is established

Ming Yin; Gengyin Li; Ming Zhou; Chengyong Zhao

2007-01-01

160

Modeling of Wind Turbine Driving Permanent Magnet Generator with Maximum Power Point Tracking System  

Microsoft Academic Search

This paper elaborates on the analysis and simulation of 15 kW Wind Turbine Generator (WTG) driving low speed Permanent Magnet Synchronous Generator (PMSG) using PSIM computer simulation program. The system consists of wind turbine, permanent magnet generator, three-phase diode rectifier, boost converter, and voltage source inverter models. In the WTG model, the best performance coefficient has been determined according to

Ali M. Eltamaly

2007-01-01

161

A Study on the Matching between the Straight Wing Non-articulated Vertical Axis Wind Turbine and the New Wind Turbine Generator  

NASA Astrophysics Data System (ADS)

In the current wind turbine generation system, there are substantial problems such as the maximum power of the wind turbine cannot be obtained under the fluctuating wind speed, high in cost and low in annual net electricity production (due to mismatch between a generator and a wind turbine). A new wind turbine generator optimized for the wind turbine output is presented in order to solve such problems. This wind turbine generator consists of a permanent magnet generator, a reactor and a rectifier, and uses neither a control circuit which requires standby electricity nor a PWM converter having a switching element. By selecting most appropriate combination of the permanent magnet generator having multiple windings and the reactor connected in series with each winding, the maximum output of the wind turbine can be obtained without using a control circuit. The new wind turbine generator was directly coupled with the straight wing non-articulated vertical axis wind turbine (SW-VAWT), and matching of the generator with the wind turbine was examined through field tests. From the test result and review, it has been confirmed that the new wind turbine generator is highly matched with the wind turbine under the fluctuating wind speed.

Siota, Takasi; Isaka, Tsutomu; Sano, Takashi; Seki, Kazuichi

162

EMD feature entropy based dynamic characteristic extraction of the draft tube of hydraulic turbines  

NASA Astrophysics Data System (ADS)

In this paper, the test data and storage management, data analysis and other aspects of the signal presented the turbine tube vibration system design ideas and methods. Describes a vibration analysis of tube effective method: Based on HHT spectrum of EMD turbine to extract the dynamic characteristics of information and software to be achieved. The results show that the method of high accuracy, and has a good feature vector extraction turbine capacity, suitable for analyzing complex and dynamic characteristics of turbine specific information; and the system has strong versatility and scalability, and achieve a good real-time performance. No. 1 in a hydropower station on the real machine test, experimental results show that the system can effectively monitor the vibration of the draft tube.

Xue, Y. G.; Luo, X. Q.; Wang, H.

2012-11-01

163

Flowchart procedure to assess the condition of turbine generator insulation  

SciTech Connect

Maintenance planning and life extension programs require that the condition of the insulation in the rotor and stator windings of generators be assessed. Unfortunately the large number of insulation deterioration processes which can affect windings, together with the lack of a universal diagnostic test which is sensitive to all these deterioration processes, makes condition assessment difficult. This paper presents a method using flowcharts which indicate a step-by-step procedure to assess insulation condition of turbine generators. Information on likely deterioration processes which arise from the insulation system characteristics and operating practice is first collected. Then, on-line monitoring and off-line tests are done to determine if problems could be occurring. Finally, depending on the outcome of the previous steps, more extensive tests and detailed inspections, usually requiring a significant outage, are performed.

Stone, G.C.; Culbert, I.; Ohirani, H. (Ontario Hydro, Toronto (CA))

1990-09-01

164

Short-Circuit Current of Wind Turbines With Doubly Fed Induction Generator  

Microsoft Academic Search

The short-circuit current contribution of wind turbines has not received much attention so far. This paper considers the short-circuit behavior, especially the short-circuit current of wind turbines with a doubly fed induction generator. Mostly, these wind turbines have a crowbar to protect the power electronic converter that is connected to the rotor windings of the induction generator. First, the maximum

Johan Morren; Sjoerd W. H. de Haan

2007-01-01

165

Optimized Permanent Magnet Generator Topologies for Direct-Drive Wind Turbines  

Microsoft Academic Search

The thesis deals with the issue of cost reduction in direct-drive generators for wind turbines. Today, the combination gearbox-medium-speed (1000-2000 rpm) induction generator largely dominates the market of MW-scale wind turbines. This is due to the lower costs of the gearbox option compared to the costs of gearless systems. Nevertheless, there is an acute interest among researchers and wind turbine

M. R. J. Dubois

2004-01-01

166

A methodology for assessment of wind turbine noise generation  

NASA Astrophysics Data System (ADS)

An investigation of the sources of impulsive noise generated by the operation of the Mod 1 2 MW wind turbine was performed to establish criteria for assessing the noise-producing potential of other large wind turbines. Unsteady loading of the rotors was determined to be the cause of the sound pressure, which was generally below 100 Hz. Complaints originated from people in dwellings with a room with a window facing the machine. Indoor monitoring revealed pressure traces in the 31.5 Hz band with energy densities exceeding background by about 30 dB. It was concluded that the sound pressure was conveyed by the walls acting as a diaphragm. The induced vibration coupled with human body fundamental modes to produce a feeling of whole-body vibration. Spectral analyses were made of the vibration fields of the Mod 2, a 17 m Darrieus, and a Mod OA to allow comparison with the nuisance points of the Mod 1. Sound pressure levels were found at certain frequencies which would eliminate the occurrence of acoustic pollution.

Kelley, N. D.; Hemphill, R. R.; McKenna, H. E.

1982-05-01

167

A Study on the Economic Conditions of Wind Turbine Generation System with Doubly Fed Synchronous Generator  

NASA Astrophysics Data System (ADS)

In recent years, many wind turbine generation systems (WTGSs) have been installed in many countries from the viewpoint of global warming, for example, for reducing CO2 emissions. However the wind turbine generator output basically fluctuates due to wind speed variations. Therefore, the annual energy production depends on the wind speed characteristic of each area. This paper presents a method to calculate the loss, power, and efficiency of WTGS with doubly fed synchronous generator (DFSG), in which the wind speed characteristic is expressed by a weibull distribution function. The annual energy production and capacity factor of the wind farm can also be obtained by the proposed method. The coefficients of weibull distribution function given by local area wind energy prediction system (LAWEPS), NEDO, have been used in the analyses of this study.

Ichita, Hajime; Takahashi, Rion; Murata, Toshiaki; Tamura, Junji; Kimura, Mamoru; Ichinose, Masaya; Futami, Moto-O.; Ide, Kazumasa

168

Thermal hydraulic performance analysis of a double tube bundle steam generator for a liquid metal reactor  

Microsoft Academic Search

In this study, thermal-hydraulic performance of a double tube bundle steam generator (DTBSG) using helically coiled tubes was analyzed numerically. For this purpose a one-dimensional thermal-hydraulic analysis computer program was developed.The DTBSG contains hot fluid and cold fluid tube bundles, a medium fluid and a pump for a medium fluid circulation in an SG. Heat is transferred from the hot

Eui-Kwang Kim; Byung-Joon Baek

2011-01-01

169

Wind turbine generator interaction with diesel generators on an isolated power system  

NASA Astrophysics Data System (ADS)

The results of a dynamic interaction investigation to characterize any disturbances caused by interfacing the Mod 0A wind turbine (150 kW configuration) with the Block Island utility diesel generator grid are reported. The tests were run when only two diesel generators were on line, and attention was given to power, frequency, and voltage time profiles. The interconnected system was examined in the start-up and synchronization phase, normal shutdown and cut-out of the wind turbine, during fixed pitch generation, and during variable pitch operation. Governors were installed on the diesel generators to accommodate the presence of wind-derived electricity. The blade pitch control was set to maintain power at 150 kW or below. Power and voltage transients were insignificant during start-up and shutdown, and frequency aberrations were within the range caused by load fluctuations. It is concluded that wind turbine generation can be successfully implemented by an isolated utility, even with a significant penetration to the total grid output.

Scott, G. W.; Wilreker, V. F.; Shaltens, R. K.

1983-07-01

170

Thermal, Hydraulic, and Corrosion Aspects of PWR Steam Generator Problems  

Microsoft Academic Search

Two types of PWR steam generators are in use: recirculating steam generators (RSGs) and once-through steam generators (OTSGs). Most of the units and vertical and this review will be limited to vertical units. Some of these steam generators have operated with a minimum of problems while other steam generator designs have experienced a variety of corrosion and mechanically induced problems.

STANLEY J. GREEN

1988-01-01

171

Rise in gas-fired power generation tracks gains in turbine efficiency  

SciTech Connect

Natural gas-fueled gas turbines--in both simple and combined-cycle configurations--will account for most power generation capacity additions through 2000. It is widely agreed that gas turbines will remain the dominant form of technology for power generation for the next decade or two, making them the power generation technology of choice for today and the future. The pre-eminent stature of gas turbines can be attributed to their low capital costs, high efficiency, low emissions, short permitting and construction lead times, and proven reliability. The versatility of gas turbines also makes them unique among power generation technologies, as they can economically serve a wide spectrum of applications and sizes--from distributed generation to industrial cogeneration and central station generation. Three primary factors contribute to the growing interest in gas turbine-based power generation and the role gas turbines will play in the future power generation market: An optimistic outlook for the supply and price of natural gas; technology advances that have produced substantial improvements in efficiency and emissions; and emissions regulations that may favor the use of gas turbines over traditional fossil-fueled steam turbines. These three factors are discussed.

Bautista, P. [Gas Research Inst., Chicago, IL (United States)

1996-08-12

172

High-order sliding mode control of a Marine Current Turbine driven Permanent Magnet Synchronous Generator  

Microsoft Academic Search

This paper deals with the speed control of a permanent magnet synchronous generator (PMSG)-based marine current turbine (MCT). Indeed, to increase the generated power and therefore the efficiency of an MCT, a nonlinear controller has been proposed. PMSG has been already considered for similar applications particularly wind turbine systems using mainly PI controllers. However, such kinds of controllers do not

S. E. Ben Elghali; M. E. H. Benbouzid; J. F. Charpentier; T. Ahmed-Ali; I. Munteanu

2009-01-01

173

Optimization of micro-turbine generation control system using genetic algorithm  

Microsoft Academic Search

This paper presents a dynamic modeling and simulation of a high speed single shaft micro-turbine generation (MTG) system for grid connected operation and shows genetic algorithm (GA) role in improvement of control system operation. The model is developed with the consideration of the main parts including: compressor-turbine, permanent magnet (PM) generator, three phase bridge rectifier and inverter. The simulation results

S. M. Alizadeh; M. Sedighizadeh; D. Arzaghi-Haris

2010-01-01

174

Preliminary design of axial flow hydrocarbon turbine\\/generator set for geothermal applications  

Microsoft Academic Search

The design of a 65 MW (e) gross turbine generator set in which a hydrocarbon gas mixture is used as the motive fluid is outlined. The turbine generator set is part of a geothermal binary cycle electric power plant proposed for the Heber site in the Imperial Valley, California. Aerodynamic design considerations and estimated unit performance for three hydrocarbon gas

N. A. Samurin; J. R. Shields

1979-01-01

175

Review on wind turbine generators and power electronic converters with the grid-connection issues  

Microsoft Academic Search

This review paper focuses on the three main electrical aspects in the wind energy conversion system (WECS): 1) wind turbine generators (WTGs), 2) power electronics converters (PECs) and 3) grid-connection issues. The current state of wind turbine generators are discussed and compared in some criteria along with the trends in the current WECS market, which are `Variable Speed', `Multi-MW' and

Hyong Sik Kim; D. D.-C. Lu

2010-01-01

176

High efficiency drive for micro-turbine generator based on current phase and revolving speed optimization  

Microsoft Academic Search

This paper presents a high efficiency drive strategy for the micro-turbine generator (MTG) in which the permanent magnet synchronous generator (PMSG) is employed. The PMSG operates with maximum efficiency by optimizing the decomposition of the dq-xes armature currents in the synchronous reference frame. In addition, in order to effectively use the turbine output power, compressor optimizing the revolving speed of

N. Urasakil; T. Senjyu; K. Uezatol; T. Funabashi; H. Fujita

2003-01-01

177

Novel Maximum Power Point Tracking Controller for Wind Turbine Driven Permanent Magnet Generator  

Microsoft Academic Search

This paper presents Maximum Power Point Control for variable speed wind turbine driven permanent-magnet generator. The wind turbine generator is operated such that the rotor speed varies according to wind speed to adjust the duty cycle of power converter and maximizes Wind Energy Conversion System (WECS) efficiency. The maximum power point for each speed value is traced using Maximum Power

R. Bharanikumar; A. C. Yazhini; A. N. Kumar

2008-01-01

178

Design of a 100 W, 500000 rpm permanent-magnet generator for mesoscale gas turbines  

Microsoft Academic Search

Mesoscale gas turbine generator systems are a promising solution for high energy and power density portable devices. This paper focuses on the design of a 100 W, 500000 rpm generator suitable for use with a gas turbine. The design procedure selects the suitable machine type and bearing technology, and determines the electromagnetic characteristics. The losses caused by the high frequency

C. Zwyssig; J. W. Kolar; W. Thaler; M. Vohrer

2005-01-01

179

RENOVATION OF TURBINE CONTROL SYSTEM USING PLC-BASED FOR SMALL HYDROELECTRIC POWER GENERATION  

Microsoft Academic Search

This paper presents the development of PLC-based turbine control system for small hydroelectric power generation with Kaplan turbine type. The proposed system is a pilot project of modernization of power plant control system prepared for supplantation of worn electronic equipment or analog technology. The proposed system is implemented for Mae-Ngat hydro- power plant, under responsibility of the Electricity Generating Authority

Tanabodee Duangsoithong; Chanapan Kongnam

180

Analysis and estimation of transient stability for a grid-connected wind turbine with induction generator  

Microsoft Academic Search

Increasing levels of wind energy in modern electrical power system is initiating a need for accurate analysis and estimation of transient stability of wind turbine generation systems. This paper investigates the transient behaviors and possible direct methods for transient stability evaluation of a grid-connected wind turbine with squirrel cage induction generator (SCIG). Firstly, by using an equivalent lump mass method,

H. Li; B. Zhao; C. Yang; H. W. Chen; Z. Chen

2011-01-01

181

Turbine-generator shaft oscillation monitoring with PCs  

SciTech Connect

Recently, Utah Power and Light Company (UP and L) introduced the use of personal computer (PC)-based generic hardware for measurement purposes. Soon after the development of the circuit monitor (CM), a need arose to record a quantity to be fed to special protective relays on five of UP and L's largest steam turbine-generator (T-G) units. This quantity was new to the relaying personnel involved, since it was neither voltage nor current but rather the speed of the shaft measured with enough precision to extract any torsional oscillations in the shaft itself. The method by which UP and L used PCs to monitor this quantity is discussed in this article.

Dalpiaz, C.P. (UP and L (US))

1989-07-01

182

Removal of Dioxin Contamination for Gas Turbine Generator Set Repair  

SciTech Connect

Decontamination projects are typically undertaken in the interest of reducing disposal costs. This goal can be achieved because decontamination concentrates the contaminant into a smaller volume or changes its form so that a lower cost disposal technology becomes available. Less frequently, decontamination adds value back to the fouled structure or contaminated piece of equipment. This removal of dioxins from a gas turbine generator set is one of the latter cases. A multi-million dollar piece of equipment could have been destined for the scrap pile. Instead, an innovative, non-destructive decontamination technology, developed under EPA and DOE demonstration programs has was employed so that the set could repaired and put back into service. The TechXtractchemical decontamination technology reduced surface dioxin / furan concentrations from as high as 24,000 ng / m2 to less than 25 ng / m2 and below detection limits.

Fay, W. S.; Borah, R.E.

2003-02-25

183

Investigation of a 30,000 Rmp Turbine-Driven Hydraulic Pump.  

National Technical Information Service (NTIS)

The thin pump experiment was successfully operated at its design point, qualifying the pivoting-tip vane for use in the turbine-driven pump. A deformable cam ring model was successfully fabricated using a diffusion bonding technique. Tests of the model sh...

D. L. Thomas J. C. Swain J. P. Wilcox R. K. Mitchell D. E. Netter

1966-01-01

184

Phoenics code thermal hydraulic analysis of a prototype LMFBR straight tube steam generator  

Microsoft Academic Search

In a joint study, carried out by Neratoom and Cham, a model has been developed using the PHOENICS-code to perform 2D and 3D steam generator calculations. The model is able to handle the most important characteristics of the thermal hydraulic behaviour of a steam generator. The feedwater flow distribution over the tubes of the bundle is calculated, without showing numerical

H. M. D. Van Essen; D. Kirkcaldy; P. J. Phelps

1987-01-01

185

Progress Toward a Microfabricated Gas Turbine Generator for Soldier Portable Power Applications.  

National Technical Information Service (NTIS)

Microelectromechanical systems (MEMS) turbocharger and electric generator devices have been fabricated and tested as part of a program at MIT to develop a microfabricated gas turbine generator for portable power applications. The overall efficiency of thi...

S. A. Jacobson S. Das N. Savoulides J. L. Steyn J. Lang

2004-01-01

186

Designing Drive Trains for the Next Generation of Wind Turbines (FloDesign Wind Turbine Corporation)  

Microsoft Academic Search

Today's wind turbines have nearly reached their maximum possible efficiency and are limited to sites with a narrow profile of wind patterns. The patent-pending Mixer Ejector Wind Turbine (MEWT) concept proposed by FloDesign promises to outperform existing wind turbines by a factor of three or more in a much wider range of wind resources. Olin College’s FloDesign SCOPE team was

Mateen Abdul; Kelcy Adamec; Gavin Boggs; Matthew Crawford; Kevin Sihlanick; Russell Torres

2009-01-01

187

Wind Turbine Generator System Acoustic Noise Test Report for the ARE 442 Wind Turbine  

Microsoft Academic Search

This test was conducted on the ARE 442 as part of the U.S. Department of Energy's (DOE's) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, five turbines are being tested at the National Wind Technology Center (NWTC) as a part of this

A. Huskey; J. van Dam

2010-01-01

188

Wind Turbine Generator System Duration Test Report for the Mariah Power Windspire Wind Turbine  

Microsoft Academic Search

This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, five turbines are being tested at the National Wind Technology Center (NWTC) as a part of the first round of this project. Duration testing is

A. Huskey; A. Bowen; D. Jager

2010-01-01

189

Wind Turbine Generator System Duration Test Report for the ARE 442 Wind Turbine  

Microsoft Academic Search

This test is being conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, four turbines are being tested at the NWTC as a part of this project. Duration testing is one of up

J. van Dam; D. Baker; D. Jager

2010-01-01

190

BIOMASS GASIFICATION AND POWER GENERATION USING ADVANCED GAS TURBINE SYSTEMS  

SciTech Connect

A multidisciplined team led by the United Technologies Research Center (UTRC) and consisting of Pratt & Whitney Power Systems (PWPS), the University of North Dakota Energy & Environmental Research Center (EERC), KraftWork Systems, Inc. (kWS), and the Connecticut Resource Recovery Authority (CRRA) has evaluated a variety of gasified biomass fuels, integrated into advanced gas turbine-based power systems. The team has concluded that a biomass integrated gasification combined-cycle (BIGCC) plant with an overall integrated system efficiency of 45% (HHV) at emission levels of less than half of New Source Performance Standards (NSPS) is technically and economically feasible. The higher process efficiency in itself reduces consumption of premium fuels currently used for power generation including those from foreign sources. In addition, the advanced gasification process can be used to generate fuels and chemicals, such as low-cost hydrogen and syngas for chemical synthesis, as well as baseload power. The conceptual design of the plant consists of an air-blown circulating fluidized-bed Advanced Transport Gasifier and a PWPS FT8 TwinPac{trademark} aeroderivative gas turbine operated in combined cycle to produce {approx}80 MWe. This system uses advanced technology commercial products in combination with components in advanced development or demonstration stages, thereby maximizing the opportunity for early implementation. The biofueled power system was found to have a levelized cost of electricity competitive with other new power system alternatives including larger scale natural gas combined cycles. The key elements are: (1) An Advanced Transport Gasifier (ATG) circulating fluid-bed gasifier having wide fuel flexibility and high gasification efficiency; (2) An FT8 TwinPac{trademark}-based combined cycle of approximately 80 MWe; (3) Sustainable biomass primary fuel source at low cost and potentially widespread availability-refuse-derived fuel (RDF); (4) An overall integrated system that exceeds the U.S. Department of Energy (DOE) goal of 40% (HHV) efficiency at emission levels well below the DOE suggested limits; and (5) An advanced biofueled power system whose levelized cost of electricity can be competitive with other new power system alternatives.

David Liscinsky

2002-10-20

191

Research on energy loss analysis of steam turbine generating unit  

Microsoft Academic Search

In order to optimize the performance of steam turbine unit performance monitoring system, the assessment indicators of which are not enough and limited to main operating parameters at present, more parameters are presented and their energy loss algorithms are given. The energy loss of these parameters aiming at an imported domestic 600MW supercritical steam turbine are analyzed, and their feather

Feng He; Niansu Hu; Tianjing Fan; Chunlin Zhang; Qiping Chen; Gaoming Huang

2011-01-01

192

A direct drive permanent magnet generator design for a tidal current turbine(SeaGen)  

Microsoft Academic Search

In this study, the feasibility of a direct-drive per- manent magnet generator for a tidal turbine power take-off system, namely MCT's SeaGen -the world's first full scale commercial tidal turbine- has been investigated. The investigated PM generator topology is called C-GEN which is an air-cored axial-flux generator developed in the University of Edinburgh. The C-GEN is prior to conventional PM

Ozan Keysan; Alasdair S. McDonald; Markus Mueller

2011-01-01

193

Background and system description of the Mod 1 wind turbine generator  

Microsoft Academic Search

The Mod-1 wind turbine considered is a large utility-class machine, operating in the high wind regime, which has the potential for generation of utility grade power at costs competitive with other alternative energy sources. A Mod-1 wind turbine generator (WTG) description is presented, taking into account the two variable-pitch steel blades of the rotor, the drive train, power generation\\/control, the

E. H. Ernst

1978-01-01

194

CHARACTERIZATION OF A FULLY-INTEGRATED PERMANENT-MAGNET TURBINE GENERATOR  

Microsoft Academic Search

This paper presents the design, fabrication, and testing of a fully-integrated permanent-magnet turbine generator based on silicon MEMS fabrication technology. This is the first silicon turbine generator supported by gas thrust and journal bearings experimentally shown to generate milliwatt-level power. In this device, a free-standing, 12 mm diameter magnetic rotor is spun above microfabricated copper windings having connectors threaded through

Bernard C. Yen; Florian Herrault; Keithan J. Hillman; Mark G. Allen; Fredric F. Ehrich; Stuart Jacobson; Chang-Hyeon Ji; Jeffrey H. Lang; Hanqing Li; Zoltan S. Spakovszky; David R. Veazie

195

Ocean thermal gradient hydraulic power plant.  

PubMed

Solar energy stored in the oceans may be used to generate power by exploiting ploiting thermal gradients. A proposed open-cycle system uses low-pressure steam to elevate vate water, which is then run through a hydraulic turbine to generate power. The device is analogous to an air lift pump. PMID:17813707

Beck, E J

1975-07-25

196

A Multilevel Modular Converter for a Large, Light Weight Wind Turbine Generator  

Microsoft Academic Search

In an onshore horizontal axis wind turbine, generator and converter are usually in the nacelle on the top of the tower, while the grid step-up transformer is placed at the bottom. Electric power is transmitted down through flexible cables of high current rating which are expensive and can suffer from large I2 R loss. An offshore wind turbine usually has

Chong H. Ng; Max A. Parker; Li Ran; Peter J. Tavner; Jim R. Bumby; Ed Spooner

2008-01-01

197

Experimental and analytical studies of lightning overvoltages in wind turbine generator systems  

Microsoft Academic Search

This paper presents the results of the experimental and analytical studies undertaken for the lightning protection of wind turbine generator systems by using a reduced-size wind turbine model. In the analytical studies, the FDTD (Finite Difference Time Domain) method is used. This study focuses on the overvoltages observed at the wavefronts of lightning surges. The lightning strokes on one of

K. Yamamoto; T. Noda; S. Yokoyama; A. Ametani

2009-01-01

198

A fault-tolerant multiphase permanent magnet generator for marine current turbine applications  

Microsoft Academic Search

Tidal currents are being recognized as a resource for sustainable electrical power generation. However, the main challenge for marine current energy development is to minimize the operation costs and maintenance operations in the marine harsh environment. These worries are justified by the incident high rates on offshore wind turbine systems. Marine current turbines are characterized by a very difficult access

Fatiha Mekri; Seifeddine Benelghali; Mohamed Benbouzid; Jean Frederic Charpentier

2011-01-01

199

Design and Aerodynamic Performance of a Small Mixed-Flow Gas Generator Turbine.  

National Technical Information Service (NTIS)

Design details and results from aerodynamic rig tests are presented for four variants of a mixed-flow turbine having a design target pressure ratio of 3:1. This experimental turbine, designed to satisfy the aerodynamic requirements of a gas generator turb...

U. Okapuu

1987-01-01

200

Design and Aerodynamic Performance of a Small Mixed-Flow Gas Generator Turbine.  

National Technical Information Service (NTIS)

Design details and results from aerodynamic rig tests are presented for four variants of a mixed flow turbine having a design target pressure ratio of 3:1. This experimental turbine, designed to satisfy the aerodynamic requirements of a gas generator turb...

U. Okapuu

1987-01-01

201

Modeling of the wind turbine with a doubly fed induction generator for grid integration studies  

Microsoft Academic Search

Due to its many advantages such as the improved power quality, high energy efficiency and controllability, etc. the variable speed wind turbine using a doubly fed induction generator (DFIG) is becoming a popular concept and thus the modeling of the DFIG based wind turbine becomes an interesting research topic. Fundamental frequency models have been presented but these models are often

Yazhou Lei; Alan Mullane; Gordon Lightbody; Robert Yacamini

2006-01-01

202

Power control of permanent magnet generator based variable speed wind turbines  

Microsoft Academic Search

When the wind power accounts for a large portion of the grid, it will be required to regulate the active power and reactive power. This paper investigates a MW-level variable speed wind turbine with a permanent magnet synchronous generator (PMSG). The power control capabilities of two kinds of control schemes conducted respectively on this wind turbine under two conditions, including

Fujin Deng; Zhe Chen

2009-01-01

203

Dynamic modeling of a wind turbine with brushless doubly fed induction generator  

Microsoft Academic Search

Brushless Doubly Fed Induction Generator (BDFIG) has been recently proposed to be used in variable speed wind turbines. This paper intends to investigate the influence of certain model simplifications to obtain a reduced-order model of a wind turbine with BDFIG suitable for transient studies. To achieve this goal, small signal analysis is performed for a recently manufactured 250 kVA BDFIG

Sajjad Tohidi; Mohammad Reza Zolghadri; Hashem Oraee; Ashknaz Oraee

2012-01-01

204

Operating experience feedback report -- turbine-generator overspeed protection systems: Commercial power reactors. Volume 11  

Microsoft Academic Search

This report presents the results of the US Nuclear Regulatory Commission`s Office for Analysis and Evaluation of Operational Data (AEOD) review of operating experience of main turbine-generator overspeed and overspeed protection systems. It includes an indepth examination of the turbine overspeed event which occurred on November 9, 1991, at the Salem Unit 2 Nuclear Power Plant. It also provides information

Ornstein

1995-01-01

205

Evolution of Westinghouse heavy-duty power generation and industrial combustion turbines  

SciTech Connect

This paper reviews the evolution of heavy-duty power generation and industrial combustion turbines in the United States from a Westinghouse Electric Corporation perspective. Westinghouse combustion turbine genealogy began in March of 1943 when the first wholly American designed and manufactured jet engine went on test in Philadelphia, and continues today in Orlando, Florida, with the 230 MW, 501G combustion turbine. In this paper, advances in thermodynamics, materials, cooling, and unit size will be described. Many basic design features such as two-bearing rotor, cold-end drive, can-annular internal combustors, CURVIC{sup 2} clutched turbine disks, and tangential exhaust struts have endured successfully for over 40 years. Progress in turbine technology includes the clean coal technology and advanced turbine systems initiatives of the US Department of Energy.

Scalzo, A.J.; Bannister, R.L. [Westinghouse Electric Corp., Orlando, FL (United States). Power Generation Business Unit; DeCorso, M.; Howard, G.S.

1996-04-01

206

Development of an axial microturbine for a portable gas turbine generator  

NASA Astrophysics Data System (ADS)

A miniature gas turbine is under development with the aim of generating electrical energy from fuel. This system consists of a compressor, combustion chamber, turbine and generator. The turbine is a single-stage axial impulse turbine (Laval turbine) with a rotor diameter of 10 mm, made of stainless steel using die-sinking electro-discharge machining. It has been tested with compressed air to speeds up to 160 000 rpm and generates a maximum mechanical power of 28 W with an efficiency of 18.4%. When coupled to a small generator, it generates 16 W of electrical power, which corresponds to an efficiency for the total system of 10.5%. The power density is mainly limited by the maximal speed of the ball bearings. The main losses are the blade profile losses and the exit losses. Higher speeds can considerably reduce the exit losses and therefore increase efficiency and power density. An improved turbine has been tested at temperatures up to 360 °C and generates up to 44 W of electrical energy with a total efficiency of 16%. A 20 mm diameter centrifugal compressor matching the pressure and flow characteristics of the turbine has been designed and is currently under construction.

Peirs, Jan; Reynaerts, Dominiek; Verplaetsen, Filip

2003-07-01

207

Numerical analysis of aerodynamics and hydraulic loss in the GTÉ-150 combustion chamber of gas-turbine power plant with the use of the fluent suite  

Microsoft Academic Search

The aerodynamic structure of the flow in the combustion chamber of the GTÉ-150 gas-turbine power plant has been simulated\\u000a numerically by means of the FLUENT suite CFD. The influence of the processes of turbulent heat and mass transfer (and combustion)\\u000a on the hydraulic loss in the combustion chamber has been investigated. Detailed comparison of the calculated and experimental\\u000a data on

D. A. Lysenko; A. A. Solomatnikov

2006-01-01

208

Tow tank testing and performance evaluation of a permanent magnet generator based small vertical axis hydrokinetic turbine  

Microsoft Academic Search

Vertical axis turbines using permanent magnet generators are being considered as options for use in hydrokinetic energy conversion. As a precursor to development of full-scale systems, scale-model turbines need to be tested in controlled environment. In this article, the results of tow tank testing of a small vertical axis turbine employing a permanent magnet generator are presented. Effects of rotor

M. J. Khan; M. T. Iqbal; J. E. Quaicoe

2008-01-01

209

PERFORMANCE IMPROVEMENT OF AIRFOILS FOR WIND TURBINES BY THE MODIFIED VORTEX GENERATOR  

Microsoft Academic Search

In this paper, the new modified vortex generator (VG) was developed for wind turbine airfoils. The modified vortex generator has a section of airfoil to decrease the drag of the vortex generator itself while keeping the strength of streamwise vortices. The wind tunnel experiments were conducted to examine the effectiveness of the modified vortex generator. The effect of Reynolds number,

Tetsuya KOGAKI; Hikaru MATSUMIYA; Kaori KIEDA; Naofumi YOSHIMIZU; Yuusuke YAMAMOTO

210

Association of wind turbine based dispersed generators and storage systems to participate in primary frequency control  

Microsoft Academic Search

The goal of this work is to develop a supervision strategy for hybrid generation systems. This strategy must allow to improve the grid insertion of wind turbine generators (WTG) by associating them some storage systems and foreseeable decentralized generator (FDG). To maintain a reference power and to contribute to the primary frequency control with a hybrid generator based on variable

V. Courtecuisse; M. El Mokadem; B. Robyns; B. Francois; M. Petit; J. Deuse

2007-01-01

211

Implementation of a Two-Axis Servo-Hydraulic System for Full-Scale Fatigue Testing of Wind Turbine Blades  

SciTech Connect

Recently, the blade fatigue testing capabilities at NREL were upgraded from single-axis to two-axis loading. To implement this, several practical challenges were addressed, as hardware complexity increased dramatically with two actuators applying the loads at right angles to each other. A custom bellcrank was designed and implemented to minimize the load angle errors and to prevent actuator side loading. The control system was upgraded to accept load and displacement feedback from two actuators. The inherent long strokes uniquely associated with wind turbine blade-tests required substantial real-time corrections for both the control and data systems. A custom data acquisition and control system was developed using a National Instruments LabVIEW platform that interfaces with proprietary servo-hydraulic software developed by MTS Corporation. Before testing, the program is run under quasi-static (slow speed) conditions and iterates to determine the correct operational control parameters for the controller, taking into consideration geometry, test speed, and phase angle errors between the two actuators. Comparisons are made between single-axis and two-axis test loads using actual test load data and load uncertainties are qualitatively described. To date, two fatigue tests have been completed and another is currently ongoing using NREL's two-axis capability.

Hughes, S. D.; Musial, W. D. [National Renewable Energy Lab., Golden, CO (US); Stensland, T. [Stensland Technologies (US)

1999-09-09

212

Study of Turbine-Generator Shaft Parameters from the Viewpoint of Subsynchronous Resonance.  

National Technical Information Service (NTIS)

An investigation of susceptibility to subsynchronous resonance (SSR) problems in turbine generators as function of shaft, network and load characteristics is the subject of this report. The evaluation of susceptibility was done through calculations of ele...

F. P. de Mello K. Q. Chang L. N . Hannett J. W. Feltes J. M. Undrill

1982-01-01

213

Wind Power Plants. Hydraulic Transmission with Control Systems for Unrestricted Number of Revolutions.  

National Technical Information Service (NTIS)

Basic ideas are presented for the design of a hydraulic transmission with its control system adapted to an electric generator operated by a wind turbine with unrestricted revolutions. The settlement of the principle is shown by means of commercially avail...

R. Andersson

1976-01-01

214

Vertical hydraulic generators experience with dynamic air gap monitoring  

Microsoft Academic Search

Dynamic air gap monitoring is the process of measuring the rotor-to-stator distance of a salient pole hydroelectric generator while it is in any of its operating modes. The main purposes for using dynamic air gap monitoring are to assist in minimizing loss of revenue through preventing the loss of rotor-to-stator air gap, and to aid in the maintenance and maintenance

G. B. Pollock; J. F. Lyles

1992-01-01

215

Laboratory implementation of variable-speed wind turbine generation  

SciTech Connect

To improve the performance of wind turbines, various control schemes such as variable speed operation have been proposed. Testing of these control algorithms on a full scale system is very expensive. To test these systems simulation, we developed programs and small scale laboratory experiments. We used this system to verify a control method that attempts to keep the turbine operating at its peak power coefficient. Both the simulations and the experiments verified the principle of operation of this control scheme.

Zinger, D.S. [Northern Illinois University, DeKalb, IL (United States); Miller, A.A. [Univ. of Idaho, Moscow, ID (United States); Muljadi, E.; Butterfield, C.P.; Robinson, M.C. [National Renewable Energy Lab., Golden, CO (United States)

1996-07-01

216

PGT21S gas turbine features Russia`s Saturn gas generator  

SciTech Connect

Presented in this paper is the new PGT21S gas turbine, which is based on an AL 31 gas generator from Saturn. The AL 31 gas generator is a two-spool engine that has a four-stage, low-pressure compressor driven by a single-stage, low-pressure turbine and a nine-stage, high-pressure compressor driven by a single-stage, high-pressure turbine. After testing, these units will be installed at the Gazprom Almasnaja compressor station in order to undergo actual operations. 3 figs.

Chellini, R.

1994-07-01

217

Variable Speed Wind Turbines Using Cage Rotor Induction Generators Connected to the Grid  

Microsoft Academic Search

In this paper, the performance of variable speed wind turbine concept with cage rotor induction generator connected to the grid is investigated. Variable-speed wind turbine generator system has been modeled and simulated to study their steady state and dynamic behavior. A cage rotor induction machine of 11 kW rating with a vector controlled back-to-back PWM-VSI inverter on the stator side

L. Mihet-Popa; V. Groza; G. Prostean; I. Filip; I. Szeidert

2007-01-01

218

A new emergency lubricating-oil system for steam turbine generators: Final report  

Microsoft Academic Search

A positive-displacement pump, powered by a turbine-shaft driven permanent magnet generator (PMG) can be used to provide lubricating oil over nearly the entire turbine generator speed range. The concept offers high reliability through its simplicity; switchgear, batteries and other auxiliaries are eliminated by hard-wiring the PMG to the pump induction drive motor. In this study, an existing PMG supplying power

G. L. Kalan; W. R. Oney; J. H. Steenburgh; R. C. Elwell

1987-01-01

219

Low-grade geothermal energy conversion by organic Rankine cycle turbine generator  

Microsoft Academic Search

Results of a demonstration project which helped determine the feasibility of converting low-grade thermal energy in 49 C water into electrical energy via an organic Rankine cycle 2500 watt (electrical) turbine-generator are presented. The geothermal source which supplied the water is located in a rural Alaskan village. The reasons an organic Rankine cycle turbine-generator was investigated as a possible source

J. P. Zarling; J. D. Aspnes

1983-01-01

220

Fuzzy logic controller to improve parameters affecting gas turbines power generation  

Microsoft Academic Search

In order to improve the performance of the gas turbine power plant and to generate electricity at the best cost, a fuzzy logic\\u000a controller model was used to show the effect of different parameters on the power generation output of gas turbines. The proposed\\u000a methodology was applied to certain parameter values collected from Rehab power station in Jordan—as a case

Rustom Mamlook; Omar Badran; Abdullah Aljumah; Abdulaziz S. Almazyad; Taisir Eldos; Emad Abdulhadi

221

Axial-flux modular permanent-magnet generator with a toroidal winding for wind-turbine applications  

Microsoft Academic Search

Permanent-magnet (PM) generators have been used for wind turbines for many years. Many small wind-turbine manufacturers use direct-drive PM generators. For wind turbine-generators, the design philosophy must cover the following characteristics: low cost, light weight, low speed, high torque and variable-speed generation. The generator is easy to manufacture and the design can be scaled up for a larger size without

Eduard Muljadi; C. P. Butterfield; Yih-Huie Wan

1999-01-01

222

A Novel 500kW High-Speed Turbine PM Synchronous Generator Set for Distributed Power Generation  

Microsoft Academic Search

The paper presents a power generation system based on the cogeneration of heat and electricity with a novel high speed turbogenerator. The machine consists of a single stage steam turbine and a directly coupled permanent magnet synchronous generator in one constructional unit. A PWM IGBT rectifier is the load to the generator and a PWM IGBT three-phase four-wire inverter feeds

Sven Wendt; Frank Benecke; Henry Güldner

2007-01-01

223

Low-grade geothermal energy conversion by organic Rankine cycle turbine generator  

NASA Astrophysics Data System (ADS)

Results of a demonstration project which helped determine the feasibility of converting low-grade thermal energy in 49 C water into electrical energy via an organic Rankine cycle 2500 watt (electrical) turbine-generator are presented. The geothermal source which supplied the water is located in a rural Alaskan village. The reasons an organic Rankine cycle turbine-generator was investigated as a possible source of electric power in rural Alaska are: (1) high cost of operating diesel-electric units and their poor long-term reliability when high-quality maintenance is unavailable and (2) the extremely high level of long-term reliability reportedly attained by commercially available organic Rankine cycle turbines. Data is provided on the thermal and electrical operating characteristics of an experimental organic Rankine cycle turbine-generator operating at a uniquely low vaporizer temperature.

Zarling, J. P.; Aspnes, J. D.

224

Comparison of direct-drive and geared generator concepts for wind turbines  

Microsoft Academic Search

The objective of this paper is to compare five different generator systems for wind turbines, namely the doubly-fed induction generator with three-stage gearbox (DFIG3G), the direct-drive synchronous generator with electrical excitation (DDSG), the direct-drive permanent-megnet generator (DDPMG), the permanent-magnet generator with single stage gearbox (PMG1G), and the doubly-fed induction generator with single-stage gearbox (DFIG1G). The comparison is based on cost

Henk Polinder; Frank F. A. van der Pijl; Gert-Jan de Vilder; Peter J. Tavner

2006-01-01

225

Turbine-generator shaft-coupled auxiliary generators supplying short-duration electrical loads for an emergency coolant injection system  

SciTech Connect

This patent describes an improved process for operating a nuclear reactor water coolant injection system during a loss-of-coolant inventory accident including the steps of: providing a second generator; mechanically coupling the second generator to the turbine and the coupled main generator: converging rotational energy of the turbine and the coupled main generator into electric power using the mechanical coupled second generator comprising converting the spindown momentum of the turbine and the coupled main generator to electric power through the mechanically coupled second generator; providing a reactor coolant injection pump having an inlet and an outlet; coupling the inlet to a source of coolant; coupling the outlet to the interior of the reactor; providing the outlet to the interior of the reactor; providing an electric motor to drive the reactor coolant injection pump; and supplying power from the second generator to the motor during operation of the plant, whereby power to the reactor coolant injection pump includes the power generated from the spindown momentum of the turbine and the coupled main generator.

Gluntz, D.M.; Black, J.C.

1989-04-04

226

Investigation of self-excited induction generators for wind turbine applications  

Microsoft Academic Search

The use of squirrel-cage induction machines in wind generation is widely accepted as a generator of choice. The squirrel-cage induction machine is simple, reliable, cheap, lightweight, and requires very little maintenance. Generally, the induction generator is connected to the utility at constant frequency and operates at practically constant speed (small range of slip). The wind turbine operates in optimum efficiency

Eduard Muljadi; Jesus Sallan; M. Sanz; Charles P. Butterfield

1999-01-01

227

Slip power recovery induction generators for large vertical axis wind turbines  

Microsoft Academic Search

Simulation results are presented for the performance of a slip power recovery induction generator coupled to a vertical-axis wind turbine. The suitability of this type of generator for wind-driven applications is discussed. A qualitative comparison with two other alternatives is made, highlighting the basic features of the generator configuration studied. Quantitative simulation analysis showed that it is possible to reduce

H. L. Nakra; B. Dube

1988-01-01

228

New-generation gas turbine helping brewery lighten energy costs  

SciTech Connect

In nearly any manufacturing industry, the loss of electrical power can have a severe impact on the manufacturing process. The case of Labatt's Ontario Breweries in particular, the loss of electrical service puts a crimp in the brewmaster's art by forcing the company to dump large quantities of it's Labatt's Blue. To solve the problem, the company has installed a gas-turbine-drive cogeneration system to guard against brownout. The new 501-KB7 was developed from the well-established 501-KB5 turbine. It has improved power output over the 501-KB7 design, up from 4025 to 5225 kw, a higher 13.5:1 pressure ratio, and a 32% increased in airflow (20.4 kg/s). The Labatt's installation which became operational in 1993 reduced the Breweries energy cost because of 501-KB7 turbine's higher energy output. 3 figs.

Brezonick, M.

1994-10-01

229

Hydraulic resistance and convective heat transfer within independent power generation micro sources (IPM) channels  

NASA Astrophysics Data System (ADS)

The introduction of new structural materials and technologies contributes to the efficiency increase for the compact IPMs used in various branches of engineering. Use of a driving high-temperature (TIT600K), regenerative (the regeneration ratio is E>85%) micro gas turbine engine ?GTE, major components which are made of structural ceramics, allows not only to maintain the effective efficiency at ?e=26-30%, but, also, sharply reduce the material consumption rate for the micro source as a whole. Application of the laser prototyping technique to manufacture the air heater, which is a part of ?GTE, increases the IPM compactness. Miniaturization of the air heater, manufactured by the structural ceramics laser fusion, can significantly reduce the hydraulic diameter (dh<=1.0 mm) of the channels, designed to transport the working media inside it. Reducing dh leads to a significant increase in the hydraulic resistance of the micro channels. The associated increase in the energy consumption for ?GTE's own needs is compensated by increasing the TIT, E, and heat transfer coefficients in micro channels, and by eliminating the need in cooling for high temperature IPM components.

V, Sudarev A.; V, Sudarev B.; A, Suryaninov A.

2012-05-01

230

Comparative Assessment of Direct Drive High Temperature Superconducting Generators in Multi-Megawatt Class Wind Turbines  

SciTech Connect

This paper summarizes the work completed under the CRADA between NREL and American Superconductor (AMSC). The CRADA combined NREL and AMSC resources to benchmark high temperature superconducting direct drive (HTSDD) generator technology by integrating the technologies into a conceptual wind turbine design, and comparing the design to geared drive and permanent magnet direct drive (PMDD) wind turbine configurations. Analysis was accomplished by upgrading the NREL Wind Turbine Design Cost and Scaling Model to represent geared and PMDD turbines at machine ratings up to 10 MW and then comparing cost and mass figures of AMSC's HTSDD wind turbine designs to theoretical geared and PMDD turbine designs at 3.1, 6, and 10 MW sizes. Based on the cost and performance data supplied by AMSC, HTSDD technology has good potential to compete successfully as an alternative technology to PMDD and geared technology turbines in the multi megawatt classes. In addition, data suggests the economics of HTSDD turbines improve with increasing size, although several uncertainties remain for all machines in the 6 to 10 MW class.

Maples, B.; Hand, M.; Musial, W.

2010-10-01

231

Thermal-hydraulic analysis of once-through steam generators. Final report. [PWR  

Microsoft Academic Search

The objective of this project is to provide EPRI with the best currently available estimates of the steady-state local thermal\\/hydraulic conditions for The Babcock and Wilcox Once-Through Steam Generator (OTSG). The sensitivity of the estimates to correlation uncertainties is also provided. The best estimate analyses and sensitivity studies were carried out using a developmental multi-dimensional computer code, THEDA-1, which solves

R. T. Fortino; W. J. Oberjohn; J. G. Rice; D. K. Cornelius

1980-01-01

232

Horizontal Steam Generator Thermal-Hydraulics at Various Steady-State Power Levels  

Microsoft Academic Search

Three-dimensional computer simulation and analyses of the horizontal steam generator thermal-hydraulics of the WWER 1000 nuclear power plant have been performed for 50% and 75% partial loads, 100% nominal load and 110% over-load. Presented results show water and steam mass flow rate vectors, steam void fraction spatial distribution, recirculation zones, swell level position, water mass inventory on the shell side,

Vladimir D. Stevanovic; Zoran V. Stosic; Michael Kiera; Uwe Stoll

2002-01-01

233

Candidate wind turbine generator site: annual data summary, January 1981-December 1981  

SciTech Connect

Summarized hourly meteorological data for 34 candidate and wind turbine generator sites for calendar year 1981 are presented. These data are collected for the purpose of evaluating the wind energy potential at these sites and are used to assist in selection of potential sites for installation and testing of large wind turbines in electric utility systems. For each site, wind speed, direction, and distribution data are given in eight tables. Use of information from these tables, with information about specific wind turbines, should allow the user to estimate the potential for wind energy production at each site.

Sandusky, W.F.; Buck, J.W.; Renne, D.S.; Hadley, D.L.; Abbey, O.B.

1982-07-01

234

Candidate wind turbine generator site annual data summary for January 1980 through December 1980  

SciTech Connect

Summarized hourly meteorological data for fourteen candidate and wind turbine generator sites are presented in this report. These data are collected for the Department of Energy for the purpose of evaluating the wind energy potential at these sites and are used to assist in selection of potential sites for installation and testing of large wind turbines in electric utility systems. For each site, data are given in eight tables and one figure. Use of information from these tables, with information about specific wind turbines, should allow the user to estimate the potential for wind energy production at each site.

Sandusky, W.F.; Renne, D.S.

1981-04-01

235

Candidate wind turbine generator site annual data summary for January 1979 through December 1979  

SciTech Connect

Summarized hourly meteorological data for fifteen candidate and wind turbine generator sites are presented in this report. These data are collected for the Department of Energy for the purpose of evaluating the wind energy potential at these sites and are used to assist in selection of potential sites for installation and testing of large wind turbines in electric utility systems. For each site, data are given in eight tables and one figure. Use of information from these tables, with information about specific wind turbines, should allow the user to estimate the potential for wind energy production at each site.

Sandusky, W.F.; Renne, D.S.

1981-03-01

236

Statistical Safety Evaluation of BWR Turbine Trip Scenario Using Coupled Neutron Kinetics and Thermal Hydraulics Analysis Code SKETCH-INS/TRACE5.0  

NASA Astrophysics Data System (ADS)

The Best Estimate Plus Uncertainty (BEPU) method has been prepared for the regulatory cross-check analysis at Japan Nuclear Energy Safety Organization (JNES) on base of the three-dimensional neutron-kinetics/thermal- hydraulics coupled code SKETCH-INS/TRACE5.0. In the preparation, TRACE5.0 is verified against the large-scale thermal-hydraulic tests carried out with NUPEC facility. These tests were focused on the pressure drop of steam-liquid two phase flow and void fraction distribution. From the comparison of the experimental data with other codes (RELAP5/MOD3.3 and TRAC-BF1), TRACE5.0 was judged better than other codes. It was confirmed that TRACE5.0 has high reliability for thermal hydraulics behavior and are used as a best-estimate code for the statistical safety evaluation. Next, the coupled code SKETCH-INS/TRACE5.0 was applied to turbine trip tests performed at the Peach Bottom-2 BWR4 Plant. The turbine trip event shows the rapid power peak due to the voids collapse with the pressure increase. The analyzed peak value of core power is better simulated than the previous version SKETCH-INS/TRAC-BF1. And the statistical safety evaluation using SKETCH-INS/TRACE5.0 was applied to the loss of load transient for examining the influence of the choice of sampling method.

Ichikawa, Ryoko; Masuhara, Yasuhiro; Kasahara, Fumio

237

BIOMASS GASIFICATION AND POWER GENERATION USING ADVANCED GAS TURBINE SYSTEMS  

Microsoft Academic Search

A multidisciplined team led by the United Technologies Research Center (UTRC) and consisting of Pratt & Whitney Power Systems (PWPS), the University of North Dakota Energy & Environmental Research Center (EERC), KraftWork Systems, Inc. (kWS), and the Connecticut Resource Recovery Authority (CRRA) has evaluated a variety of gasified biomass fuels, integrated into advanced gas turbine-based power systems. The team has

David Liscinsky

2002-01-01

238

Advanced gas turbines: The choice for low-cost, environmentally superior electric power generation  

SciTech Connect

In July 1993, the US Department of Energy (DOE) initiated an ambitious 8-year program to advance state-of-the-art gas turbine technology for land-based electric power generation. The program, known as the Advanced Turbine System (ATS) Program, is a joint government/industry program with the objective to demonstrate advanced industrial and utility gas turbine systems by the year 2000. The goals of the ATS Program are to develop gas turbine systems capable of providing low-cost electric power, while maintaining environmental superiority over competing power generation options. A progress report on the ATS Program pertaining to program status at DOE will be presented and reviewed in this paper. The technical challenges, advanced critical technology requirements, and systems designs meeting the goals of the program will be described and discussed.

Zeh, C.M.

1996-08-01

239

Development of a hydraulic control mechanism for cyclic pitch marine current turbines  

Microsoft Academic Search

Tidal power generation by means of marine current farms is potentially a large renewable energy resource which could be harnessed in many coastal waters. Its availability is highly predictable in time, and the technology promises high energy conversion efficiency along with a relatively low impact on sea life due to its relatively small disturbance of natural tidal flows.A series of

Alessandro Schönborn; Matthew Chantzidakis

2007-01-01

240

Effects of electrical parameters of induction generator on the transient voltage stability of a fixed speed wind turbine  

Microsoft Academic Search

This paper describes the effect of electrical parameters of the induction generator on the transient voltage stability of a fixed speed wind turbine connected to a simple grid; the dynamic behavior of a wind turbine connected to the grid is examined. The model of the fixed speed wind turbine has been developed in the simulation tool Matlab\\/Simulink. Itpsilas composed by

L. Dusonchet; F. Massaro; E. Telaretti

2008-01-01

241

Directly-Coupled Gas Turbine Permanent Magnet Generator Sets for Prime Power Generation On Board Electric Ships  

Microsoft Academic Search

Prime power generation on board all-electric ships presents several options that affect fuel consumption, power density, operational effectiveness, and survivability. A study that aims at understanding the effects of some of these options has been conducted and results are reported in this paper. It is found that direct coupling of gas turbines to permanent magnet generators reduces system mass and

S. Z. Vijlee; A. Ouroua; L. N. Domaschk; J. H. Beno

2007-01-01

242

Reference Value Choice of the Wind Turbine Active Power with Doubly-Fed Induction Generator  

Microsoft Academic Search

The variable speed wind turbine with doubly-fed induction generator (DFIG) is today widely used concept. This paper presents a control system of the DFIG wind turbine with focus on the control strategies and on active power reference value choice. The present control method is designed for super-synchronous, sub-synchronous and synchronous working modes. In order to investigate the dynamic responses during

J. Smajo; M. Smajo; D. Vukadinovic

243

Air bottoming cycle: Use of gas turbine waste heat for power generation  

Microsoft Academic Search

This paper presents a thermodynamic analysis of the Air Bottoming Cycle (ABC) as well as the results of a feasibility study for using the Air Bottoming Cycle for gas turbine waste heat recovery\\/power generation on oil\\/gas platforms in the North Sea. The basis for the feasibility study was to utilize the exhaust gas heat from an LM2500PE gas turbine. Installation

O. Bolland; M. Foerde; B. Haande

1996-01-01

244

A control system retrofit for a GE frame 5 turbine/generator unit  

SciTech Connect

Expecting an increase in generating capacity demand for the 1990's coupled with minimal new construction activities in the 1980's both utilities and non-utilities are considering replacement of worn out or obsolete turbomachinery control systems with modern Digital Control Systems (DCS). Retrofitting existing turbine-generators with a modern DCS will increase the effectiveness of the present capacity by: increasing the reliability of starts; increasing system availability; improving control performance; improving information display and data acquisition; and improving or replacing outdated fuel delivery systems. This paper describes a turn-key retrofit furnished by the Woodward Governor Company for a combined cycle General Electric (GE) Frame 5 Fuel Regulator controlled turbine/generator unit located at Arizona Electric Power Cooperative's (AEPCO) Apache Station. The scope of the retrofit affected the turbine operating system and the generator operating system.

Yacobucci, R.B. (End User and Retrofit Controls Engineering Turbomachinery Group, Woodward Governor Co., Fort Collins, CO (US))

1991-06-01

245

Control of a stand alone variable speed wind turbine with a permanent magnet synchronous generator  

Microsoft Academic Search

A novel control strategy for the operation of a permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine is presented in this paper. The direct drive PMSG is connected to the load through a switch mode rectifier and a vector controlled pulse width modulated (PWM) IGBT-inverter. The generator side switch mode rectifier is controlled to achieve maximum

M. E. Haque; K. M. Muttaqi; M. Negnevitsky

2008-01-01

246

Modeling and control of a variable-speed wind turbine equipped with permanent magnet synchronous generator  

Microsoft Academic Search

In this paper the operation of a variable-speed, stall regulated wind turbine equipped with a permanent magnet synchronous generator (PMSG) is examined. The emphasis is placed on the analysis of the electric part of the system, i.e. the electrical generator, the power electronics converters and the control. The operational characteristics of the machine are investigated through a series of computer

D. C. Aliprantis; S. A. Papathanassiou; M. P. Papadopoulos; A. G. Kladas

247

A Novel Control Strategy for a Variable Speed Wind Turbine with a Permanent Magnet Synchronous Generator  

Microsoft Academic Search

This paper presents a novel control strategy for the operation of a direct drive permanent magnet synchronous generator (PMSG) based stand alone variable speed wind turbine. The control strategy for the generator side converter with maximum power extraction is discussed. The stand alone control is featured with output voltage and frequency controller capable of handling variable load. The potential excess

M. E. Haque; M. Negnevitsky; K. M. Muttaqi

2008-01-01

248

Kinetic Energy of Wind-Turbine Generators for System Frequency Support  

Microsoft Academic Search

As wind power penetration increases and fossil plants are retired, it is feared that there will be insufficient kinetic energy (KE) from the plants to support the system frequency. This paper shows the fear is groundless because the high inertias (H cong 4 seconds) of wind turbine-generators (WTGs) can be integrated to provide frequency support during generation outage.

Ping-Kwan Keung; Pei Li; Hadi Banakar; Boon Teck Ooi

2009-01-01

249

Modelling and control of a variable-speed switched reluctance generator based wind turbine  

Microsoft Academic Search

This paper studies the system modelling and control aspects of switched reluctance generator (SRG) based variable speed wind turbines. A control system is implemented to provide proper operation of the SRG as well as power tracking capabilities for varying wind speeds. The control system for the grid side inverter that will allow the SRG to properly generate power to the

D. McSwiggan; L. Xu; T. Littler

2007-01-01

250

Simulation of Direct Drive Generators Designed for Underwater Vertical Axis Turbines  

Microsoft Academic Search

This paper presents simulated results for several direct drive permanent magnet generators, with different rotation speeds, designed to meet the requirements of an unregulated watercourse. At this stage our focus is on a small- scale concept but in other locations a larger generator may be more beneficial. The simulations are based on data for an existing vertical axis turbine. The

K. Nilsson; E. Segergren; M. Leijon

2004-01-01

251

Electric Power Generation from a Geothermal Souce Utilizing a Low-Temperature Organic Rankine Cycle Turbine  

Microsoft Academic Search

A demonstration project to generate electricity with a geothermal source and low-temperature organic Rankine cycle turbine in a rural Alaskan location is described. Operating data and a set of conclusions are presented detailing problems and recommendations for others contemplating this approach to electric power generation.

J. D. Aspnes; J. P. Zarling

1982-01-01

252

Electric Power Generation from a Geothermal Source Utilizing a Low-Temperature Organic Rankine Cycle Turbine  

Microsoft Academic Search

A demonstration project to generate electricity with a geothermal source and low-temperature organic Rankine cycle turbine in a rural Alaskan location is described. Operating data and a set of conclusions are presented detailing problems and recommendations for others contemplating this approach to electric power generation.

J. D. Aspnes; J. P. Zarling

1982-01-01

253

Review of modeling methods in electromagnetic and thermal design of permanent magnet generators for wind turbines  

Microsoft Academic Search

The rapidly developing wind power industry demands high power generators. Direct driven permanent magnet synchronous generator (PMSG), which has the advantages of high drive train efficiency and high reliability, is promising in wind turbine applications, especially offshore. It is known, that direct driven PMSG is heavier than its geared counterparts, which increases the cost and may bring up engineering challenges.

Z. Zhang; A. Matveev; S. Ovrebo; R. Nilssen; A. Nysveen

2011-01-01

254

Real time digital controller of grid connected Doubly-Fed Induction wind turbine generator  

Microsoft Academic Search

In this paper, a real time digital hardware simulation tool to study the performances and responses to grid disturbances of Doubly Fed Induction Generators (DFIGs) is presented. The simulator is a scaled down version of a DFIG wind turbine generator capable of experimenting with various control algorithms and compatibility to grid connection issues under grid disturbances. The paper discusses design,

Mohsen Mesbah; Syed Islam

2012-01-01

255

Output power leveling of wind turbine Generator for all operating regions by pitch angle control  

Microsoft Academic Search

Wind energy is not constant and windmill output is proportional to the cube of wind speed, which causes the generated power of wind turbine generators (WTGs) to fluctuate. In order to reduce fluctuation, different methods are available to control the pitch angle of blades of windmill. In a previous work, we proposed the pitch angle control using minimum variance control,

Tomonobu Senjyu; Ryosei Sakamoto; Naomitsu Urasaki; Toshihisa Funabashi; Hideki Fujita; Hideomi Sekine

2006-01-01

256

Nonlinear control for variable-speed wind turbines with permanent magnet generators  

Microsoft Academic Search

This paper proposed a nonlinear control algorithm for a variable-speed wind turbine without wind speed measurement. The measured permanent magnet generator output current, terminal voltage and shaft speed are used to estimate the electromagnetic torque of the permanent magnet generator by using Kalman filter. Then the wind speed is estimated by Newton-Raphson method after obtaining the estimated power of the

Jianzhong Zhang; Ming Cheng; Zhe Chen

2007-01-01

257

Modelling and ride-through capability of variable speed wind turbines with permanent magnet generators  

Microsoft Academic Search

A model for a variable speed wind turbine with a permanent magnet, multipole, synchronous generator is developed and implemented in the simulation tool PSS\\/E as a user-written model. The model contains representations of the permanent magnet generator, the frequency converter system with control, the aerodynamic rotor and a lumped mass representation of the shaft system. This model complexity is needed

Vladislav Akhmatov

2006-01-01

258

Impact of wind turbine generators on network resonance and harmonic distortion  

Microsoft Academic Search

Distributed generators (DGs) are being increasingly connected at medium voltage level distribution networks. It is likely that different types of DGs, i.e. wind turbine generators (WTGs), photovoltaic solar systems, etc, may be connected on the same feeder. Most of the modern DGs are equipped with power electronic converters at their terminals, which act as sources of harmonic injection into the

Dhaval Patel; Rajiv K. Varma; Ravi Seethapathy; Michael Dang

2010-01-01

259

An Experimental Study of Lightning Overvoltages in Wind Turbine Generation Systems Using a Reduced-Size Model  

Microsoft Academic Search

Wind turbine generation systems are built at locations where few tall structures are found nearby so as to obtain good wind conditions, and thus, they are often struck by lightning. To promote wind power generation, lightning-protection methodologies for such wind turbine generation systems have to be established. This paper presents the result of an experimental study of lightning overvoltages in

Kazuo Yamamoto; Taku Noda; Shigeru Yokoyama; Akihiro Ametani

2006-01-01

260

The study of broadband current transducer system for on-line monitoring of partial discharges in turbine generator  

Microsoft Academic Search

On-line monitoring of partial discharges (PD) in turbine generator is a important test for assessing the condition of generator insulation system. In this study, a broadband current transducer system for on-line monitoring of PD in turbine generator has been studied. Combined with a pulse height analyzer and a frequency spectrum analyzer, the transducer system has been used to detect three

Hui Ma; Jixun Ma; Guangnin Wu; Zhigang Huang; Xinyan Wu; Henkun Xie; Delin Sun; Rumin Zhang

1995-01-01

261

Hysteresis phenomena in hydraulic measurement  

NASA Astrophysics Data System (ADS)

Hysteresis phenomena demonstrate the lag between the generation and the removal of some physical phenomena. This paper studies the hysteresis phenomena of the head-drop in a scaled model pump turbine using experiment test and CFD methods. These lag is induced by complicated flow patterns, which influenced the reliability of rotating machine. Keeping the same measurement procedure is concluded for the hydraulic machine measurement.

Ran, H. J.; Luo, X. W.; Chen, Y. L.; Xu, H. Y.; Farhat, M.

2012-11-01

262

Economic evaluation of solar thermal hybrid H 2O turbine power generation systems  

Microsoft Academic Search

The economics of two proposed solar thermal hybrid power generation systems (STHSs) have been evaluated. Each system consists of direct-steam-generation solar collectors, a steam accumulator and a gas turbine power generation system which uses steam as its working fluid. One (STHS-A) of the proposed systems emits CO2 generated by burning fuel, whereas the other (STHS-B) captures the CO2. Assuming that

Takanobu Kosugi; Pyong Sik Pak

2003-01-01

263

Microcomputer-based turbine-governor simulation for a generating unit  

SciTech Connect

There has been continuous interest in the development of laboratory models of power systems for a broad range of system and component oriented experiments. This paper describes the microcomputer-based turbine-governor simulation for a generating unit. Physical simulation of the turbine prime-mover system is obtained from both a separately excited DC motor by controlling the armature current using thyristors and a squirrel-cage induction motor by varying the input frequency with pulse-width-modulated inverter and by compensating the torque output. Flywheels can be added to adjust the machine inertia constant to the desired value. The transfer function of turbine-governing systems is implemented in software form on the microcomputer. The overall concept and details of a real-time digital control scheme for the turbine-governing system are explained. The performance of a simulated system is compared with that of a theoretical model system.

Kim, K.C.

1988-01-01

264

Reliability improvements and modernization of low pressure turbine cylinders for steam-turbine generator power plants  

SciTech Connect

This paper presents the use of 2-D and 3-D finite element analysis to determine the cause of distress in certain components in the low pressure turbines for large power plants. The same finite element models are then used for parametric evaluation of various alternates to increase component fatigue life. Finally, the 3-D finite element model is used for designing a new cylinder which can withstand severe cyclic duty operation requirements and can also be used for modernization of existing old power plants.

Aneja, I.K. (Westinghouse Electric Corp., Orlando, FL (United States))

1990-01-01

265

Wind shear climatology for large wind turbine generators  

SciTech Connect

Climatological wind shear analyses relevant to the design and operation of multimegawatt wind turbines are provided. Insight is provided for relating the wind experienced by a rotating blade in a shear flow to the analysis results. A simple analysis of the wind experienced by a rotating blade for three types of wind shear profiles under steady-state conditions is presented in graphical form. Comparisons of the magnitude and frequency of the variations in 1) the wind sensed by a single blade element, 2) the sum, and 3) the difference of the winds sensed by opposite blade elements show strong sensitivity to profile shape. These three items represent forcing functions that can be related to 1) flatwise bending moment, 2) torque on the shaft, and 3) teeter angle. A computer model was constructed to simulate rotational sampling of 10-s sampled winds from a tall tower for three different types of large wind turbines. Time series produced by the model indicated that the forcing functions on a rotating blade vary according to the shear profile encountered during each revolution as opposed to a profile derived from average wind conditions, e.g., hourly average winds. An analysis scheme was developed to establish a climatology of wind shear profiles derived from 10-s sampled winds and hourly average winds measured over a one-year period at several levels on a tall tower. Because of the sensitivity of the forcing function variability to profile shape, the analyses performed and presented are in the form of joint frequency distributions of velocity differences of the the top-to-hub versus the hub-to-bottom portion of disks of rotation for the three turbine configurations.

Elliott, D.L.; Wendell, L.L.; Heflick, S.K.

1982-10-01

266

Fundamental characteristics of test facility for micro hydroelectric power generation system  

Microsoft Academic Search

This paper proposes a test facility for micro hydraulic generation system. Micro hydraulic generation system is very difficult to exam their characteristics including hydraulic turbine because water flow in various conditions is necessary but it is very difficult to realize in laboratory. In this paper water flow is realized using general purpose pump that can add pressure to water flow

T. Sakurai; H. Funato; S. Ogasawara

2009-01-01

267

Next Generation Engineered Materials for Ultra Supercritical Steam Turbines  

SciTech Connect

To reduce the effect of global warming on our climate, the levels of CO{sub 2} emissions should be reduced. One way to do this is to increase the efficiency of electricity production from fossil fuels. This will in turn reduce the amount of CO{sub 2} emissions for a given power output. Using US practice for efficiency calculations, then a move from a typical US plant running at 37% efficiency to a 760 C /38.5 MPa (1400 F/5580 psi) plant running at 48% efficiency would reduce CO2 emissions by 170kg/MW.hr or 25%. This report presents a literature review and roadmap for the materials development required to produce a 760 C (1400 F) / 38.5MPa (5580 psi) steam turbine without use of cooling steam to reduce the material temperature. The report reviews the materials solutions available for operation in components exposed to temperatures in the range of 600 to 760 C, i.e. above the current range of operating conditions for today's turbines. A roadmap of the timescale and approximate cost for carrying out the required development is also included. The nano-structured austenitic alloy CF8C+ was investigated during the program, and the mechanical behavior of this alloy is presented and discussed as an illustration of the potential benefits available from nano-control of the material structure.

Douglas Arrell

2006-05-31

268

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

269

Wind turbine generators using superconducting coils and bulks  

Microsoft Academic Search

Wind power generation has been expected as a promising clean energy source in the world. Recently, generation capacity produced by wind power generators has been growing with increasing size of windmills. However, huge nacelles result in extreme load for towers supporting them. We have focused on a wind power generator using superconducting wires and superconducting bulks to solve the problem.

H. Ohsaki; Y. Terao; M. Sekino

2010-01-01

270

POWER CONTROLLER FOR A WIND-TURBINE-DRIVEN TANDEM INDUCTION GENERATOR  

Microsoft Academic Search

A controller for delivering either constant power or maximum power from a wind-turbine-driven grid connected induction generator with double stator windings, one fixed and the other able to be physically rotated, and a squirrel-cage rotor common to both stators is described. The load torque of the generator is controlled by varying the angular displacement between the two stators. The generator

JACOB PERAHIA; CHEMMANGOT V. NAYAR

1991-01-01

271

Geothermal turbine  

Microsoft Academic Search

A turbine for the generation of energy from geothermal sources including a reaction water turbine of the radial outflow type and a similar turbine for supersonic expansion of steam or gases. The rotor structure may incorporate an integral separator for removing the liquid and\\/or solids from the steam and gas before the mixture reaches the turbines.

Sohre

1982-01-01

272

Safe Harbor Kaplan Turbines Design of Setting and Cavitation Limit as Developed at the Holtwood Hydraulic Laboratory  

Microsoft Academic Search

The Safe Harbor plant is the first large development in this country to use the Kaplan type of turbine. This paper describes the problems of design and operation which were comprehensively studied by means of model and field tests, with particular regard to the power limits of the turbines as established from a study of cavitation.

L. M. Davis; G. W. Spaulding

1933-01-01

273

Matching a Permanent Magnet Synchronous Generator to a Fixed Pitch Vertical Axis Turbine for Marine Current Energy Conversion  

Microsoft Academic Search

Extracting energy from a free-flow marine current using a vertical axis fixed pitch turbine requires a generator that can handle varying speeds and loads, since such a turbine gives maximum power capture for a fixed tip speed ratio. A prototype of such a generator has been designed and constructed. In this paper, its variable speed and load operation is evaluated,

Katarina Yuen; Karin Thomas; MÅrten Grabbe; Paul Deglaire; Mathias Bouquerel; David Osterberg; Mats Leijon

2009-01-01

274

Nonlinear Robust Control to Maximize Energy Capture in a Variable Speed Wind Turbine Using an Induction Generator  

Microsoft Academic Search

The emergence of wind turbine systems for electric power generation can help satisfy the growing global demand. This paper proposes a control strategy to maximize the wind energy captured in a variable speed wind turbine, with an internal induction generator, at low to medium wind speeds. The proposed strategy controls the tip speed ratio, via the rotor angular speed, to

Erhun Iyasere; Darren M. Dawson; John R. Wagner; Mohammed Salah; Enver Tatlicioglu

2009-01-01

275

Design of permanent-magnet generators for wind turbines  

Microsoft Academic Search

There has been much interest and studies in high efficiency wind generators with permanent magnet excitation due to the increasing availability of permanent magnet materials, especially NdFeB. The present paper aims to outline the design and analysis of such a PM generator. The generator that is being used will be an 8-pole permanent magnet generator rated at 5 kW and

J. Rizk; M. Nagrial

2000-01-01

276

Axial flux, modular, permanent-magnet generator with a toroidal winding for wind turbine applications  

SciTech Connect

Permanent-magnet generators have been used for wind turbines for many years. Many small wind turbine manufacturers use direct-drive permanent-magnet generators. For wind turbine generators, the design philosophy must cover the following characteristics: low cost, light weight, low speed, high torque, and variable speed generation. The generator is easy to manufacture and the design can be scaled up for a larger size without major retooling. A modular permanent-magnet generator with axial flux direction was chosen. The permanent magnet used is NdFeB or ferrite magnet with flux guide to focus flux density in the air gap. Each unit module of the generator may consist of one, two, or more phases. Each generator can be expanded to two or more unit modules. Each unit module is built from simple modular poles. The stator winding is formed like a torus. Thus, the assembly process is simplified and the winding insertion in the slot is less tedious. The authors built a prototype of one unit module and performed preliminary tests in the laboratory. Follow up tests will be conducted in the lab to improve the design.

Muljadi, E.; Butterfield, C.P.; Wan, Y.H.

1998-07-01

277

Typical steam generator tube rupture (SGTR) effect on thermo-hydraulic parameters of VVER-1000 primary loop  

Microsoft Academic Search

In operation of nuclear power plant, it is very important to evaluate different accident scenarios in actual plant conditions. One of the main accidents is (SGTR) steam generator tube rupture in the field of nuclear safety. In this research variation of thermo-hydraulics parameters in primary loop under SGTR accident in VVER-1000 nuclear power plant is analyzed by Relap5\\/Mod 3.2 thermo-hydraulics

A. Zare; M. R. Nematollahi; K. Hadad; M. A. Mozaffari

278

Thermal\\/hydraulic design and performance of an LMFBR double wall tube seven tube steam generator model  

Microsoft Academic Search

This paper describes the thermal\\/hydraulic design and performance of a full-length LMFBR steam generator. This seven-tube model (the few tube model-FTM), uses straight, prestressed double wall tubes with third fluid leak detection capabilities. This paper describes the FTM design and instrumentation, the test facility including digital data acquisition system, and a comparison between pretest predictions and actual experimental thermal\\/hydraulic performance

J. Y. Hwang; T. E. Fewell; L. E. Efferding; R. P. Waszink

1981-01-01

279

Thermal/hydraulic design and performance of an LMFBR double wall tube seven tube steam generator model  

SciTech Connect

This paper describes the thermal/hydraulic design and performance of a full-length LMFBR steam generator. This seven-tube model (the few tube model-FTM), uses straight, prestressed double wall tubes with third fluid leak detection capabilities. This paper describes the FTM design and instrumentation, the test facility including digital data acquisition system, and a comparison between pretest predictions and actual experimental thermal/hydraulic performance results for 100 percent load. 7 refs.

Hwang, J.Y.; Fewell, T.E.; Efferding, L.E.; Waszink, R.P.

1981-01-01

280

Achieving more reliable operation of turbine generators at nuclear power plants by improving the water chemistry of the generator stator cooling system  

NASA Astrophysics Data System (ADS)

Ways of improving the water chemistry used in the turbine generator stator's cooling systems at Russian nuclear power plants are considered. Data obtained from operational chemical monitoring of indicators characterizing the quality of cooling water in the turbine generator stator cooling systems of operating power units at nuclear power plants are presented.

Tyapkov, V. F.; Chudakova, I. Yu.; Alekseenko, O. A.

2011-08-01

281

Achieving more reliable operation of turbine generators at nuclear power plants by improving the water chemistry of the generator stator cooling system  

Microsoft Academic Search

Ways of improving the water chemistry used in the turbine generator stator's cooling systems at Russian nuclear power plants are considered. Data obtained from operational chemical monitoring of indicators characterizing the quality of cooling water in the turbine generator stator cooling systems of operating power units at nuclear power plants are presented.

V. F. Tyapkov; I. Yu. Chudakova; O. A. Alekseenko

2011-01-01

282

A new monitoring system for wind turbines with doubly-fed induction generators  

Microsoft Academic Search

For modern large wind farms, it is interesting to design an efficient diagnosis system oriented to wind turbine generators based on doubly-fed induction machine (DFIM). Intensive research efforts have been focused on the signature analysis to predict or to detect electrical and mechanical faults in induction machines. Different signals can be used such as voltages, currents or stray flux. In

A. Yazidi; G. A. Capolino; F. Filippetti; D. Casadei

2006-01-01

283

Analysis of safe integration criteria for wind power with induction generators based wind turbines  

Microsoft Academic Search

This paper considers the problem of grid integration of wind power. The integration level, i.e., the amount of wind power that can be connected to a given point of the grid while complying with certain interconnection requirements is determined for 6 different cases of induction generator based wind turbines, both with fixed and variable speed. Acceptable terminal voltage variation, power

Romeu Reginato; Marcos G. Zanchettin; Marcos Tragueta

2009-01-01

284

Optimizing the Annual Energy Production of Doubly-Fed Induction Generator Based Wind Turbines  

Microsoft Academic Search

This paper presents a detailed methodology for the estimation and optimization of the annualized performances of wind turbines equipped with doubly-fed induction generators (DFIG). The method takes into account the losses and ratings of different system components : gearbox, DFIG, and power converters. The influence of the DC-bus voltage limit of the power converters on the annual energy yield reduction

D. Aguglia; R. Wamkeue; P. Viarouge; J. Cros

2007-01-01

285

30. GENERAL INTERIOR VIEW OF TURBINE/GENERATORS ON MAIN FLOOR (LEVEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

30. GENERAL INTERIOR VIEW OF TURBINE/GENERATORS ON MAIN FLOOR (LEVEL +55) OF POWERHOUSE #1; VIEW IS TAKEN FROM LEVEL +82 AT SOUTH END OF POWERHOUSE. - Bonneville Project, Powerhouse No.1, Spanning Bradford Slough, from Bradford Island, Bonneville, Multnomah County, OR

286

Model 0A Wind Turbine Generator FMEA (Failure Modes and Effects Analysis).  

National Technical Information Service (NTIS)

The results of Failure Modes and Effects Analysis (FMEA) conducted for the Wind Turbine Generators are presented. The FMEA was performed for the functional modes of each system, subsystem, or component. The single-point failures were eliminated for most o...

W. E. Klein V. R. Lalli

1989-01-01

287

Increasing Power Density of Kinetic Turbines for Cost-effective Distributed Power Generation  

Microsoft Academic Search

Kinetic hydropower generation involves the use of underwater turbines in relatively high- velocity rivers. Their design is relatively inexpensive, without the requirement for costly infrastructure such as dams or powerhouses but large power production requires the use of multiple units. Furthermore, with no associated reservoir or spillway, kinetic hydropower has minimal environmental impact. The focus of this study is on

David L. F. Gaden; Eric L. Bibeau

288

The generation of electricity by gas turbines using the catalytic combustion of low-Btu gases  

Microsoft Academic Search

Various systems for the generation of electricity by gas turbines using catalytic combustion of low-Btu gases have been investigated. Parametric studies of three configurations that are deemed to be practically feasible have been completed. It is shown that thermodynamic efficiency of these systems may be quite high. The system design has been made to comply with generally accepted limitations on

O. P. Frederiksen; B. Qvale

1989-01-01

289

Dynamic response testing of the ``North Wind 100`` Wind Turbine Generator. Final report  

Microsoft Academic Search

This report covers the Dynamic Response Testing of the Northern Power Systems ``North Wind 100`` Wind Turbine Generator. This work was carried out from Oct. 1986 through Dec. 1987 in Altamont Pass. An extensive instrumentation, with over 100 channels of data, was collected on FM tape and processed with SERI MidScale Computer System. The test program objectives, to collect and

C. J. Coleman; B. McNiff

1987-01-01

290

Economic index for selection of wind turbine generator at a site  

Microsoft Academic Search

In this paper a new methodology to select a wind turbine generator from the view point of performance and economic considerations is presented. Weibull probability density function is used to analyze the wind data and the performance analysis is based on computing the capacity factors. The economic considerations involve computation of cost of energy based on the energy yield, capital

Sangamesh S. Doddamani; Suresh H. Jangamshetti

2008-01-01

291

Dynamic response testing of the North Wind 100'' Wind Turbine Generator  

Microsoft Academic Search

This report covers the Dynamic Response Testing of the Northern Power Systems North Wind 100'' Wind Turbine Generator. This work was carried out from Oct. 1986 through Dec. 1987 in Altamont Pass. An extensive instrumentation, with over 100 channels of data, was collected on FM tape and processed with SERI MidScale Computer System. The test program objectives, to collect and

C. J. Coleman; B. McNiff

1987-01-01

292

Wind-turbine-generator interference to electromagnetic systems. Final report, April 1978March 1979  

Microsoft Academic Search

Selected problems associated with wind turbine generator interference to the electromagnetic environment have been investigated theoretically and experimentally. A study of the reception of circularly polarized electromagnetic waves in the presence of a slowly rotating rectangular metal plate indicates that a similarly polarized receiving antenna discriminates against the scattered signals in the backward scattering region. This implies that the video

D. L. Sengupta; T. B. A. Senior

1979-01-01

293

Television Interference due to Electromagnetic Scattering by the MOD2 Wind Turbine Generators  

Microsoft Academic Search

The characterization and identification of electromagnetic interference created by the slowly rotating blade of a MOD-2 wind turbine generator (WTG) is investigated. Field measurement data supports the thesis that at ground level the near field scattered component is an amplitude modulated secondary signal. A prediction methodology to define zones of interference to television broadcast reception is presented.

K. H. Cavcey; L. Y. Lee; M. A. Reynolds

1984-01-01

294

Ridethrough of wind turbines with doubly-fed induction generator during a voltage dip  

Microsoft Academic Search

In this paper, a solution is described that makes it possible for wind turbines using doubly-fed induction generators to stay connected to the grid during grid faults. The key of the solution is to limit the high current in the rotor in order to protect the converter and to provide a bypass for this current via a set of resistors

Johan Morren; Sjoerd W. H. de Haan

2005-01-01

295

General electric steam turbine-generators for nuclear power plants: a review and outlook  

Microsoft Academic Search

From international nuclear industries fair; Basel, Switzerland (16 Oct ; 1972). Operating experience with General Electric-built large steam turbine-; generators in utility-type nuclear power plants is reviewed. The efficiency ; performance and in-service reliability of these units are briefly discussed. ; Comments on the requirements of future units are added. (auth);

Hegetschweiler

1972-01-01

296

Low-Speed Permanent-Magnet Generators for Gearless Wind Turbines.  

National Technical Information Service (NTIS)

The paper deals with the optimization and comparison of two types of low-speed surface-mounted permanent-magnet generators for gearless wind turbines. The machines have different kinds of stator winding. The conventional machine has a three-phase, fractio...

P. Lampola

2001-01-01

297

System and method for efficiently generating power in a solid fuel gas turbine  

Microsoft Academic Search

This patent describes a method for generating electrical power utilizing a compressor, spray evaporator, turbine, pressurized fluidized bed combustor (hereinafter PFBC), regenerator, dynamo-electric machine, and solid fuel. It comprises: compressing and heating air in the compressor; cooling the hot compressed air in the spray evaporator, thereby producing cooled compressed air of increased mass flow; heating the cooled compressed air in

1991-01-01

298

Choice of Pole-Slot Number Combination for PM Generator Direct-Driven by Wind Turbine  

Microsoft Academic Search

The permanent magnet (PM) generator direct-driven by wind turbine has the advantages of high efficiency, simple structure and reliable operation, and the features of low speed, multi-pole and large size. How to utilize sufficiently the structural dimension, improve the performance and reduce the cost of the machine by proper choice of the pole number and stator slot number is an

Yue Zhang; Fengxiang Wang

2008-01-01

299

Separation control on high lift low-pressure turbine airfoils using pulsed vortex generator jets  

Microsoft Academic Search

Boundary layer separation control has been studied using vortex generator jets (VGJs) on a very high lift, low-pressure turbine airfoil. Experiments were done under low (0.6%) freestream turbulence conditions on a linear cascade in a low speed wind tunnel. Pressure surveys on the airfoil surface and downstream total pressure loss surveys were documented. Instantaneous velocity profile measurements were acquired in

Ralph J. Volino; Mounir B. Ibrahim

300

Television Interference Due to Electromagnetic Scattering by the MOD2 Wind Turbine Generators  

Microsoft Academic Search

The characterization and identification of electromagnetic interference created by the slowly rotating blade of a MOD-2 wind turbine generator (WTG) is investigated. Field measurement data supports the thesis that at ground level the near field scattered component is an amplitude modulated secondary signal. A prediction methodology to define zones of interference to television broadcast reception is presented.

K. H. Cavcey; L. Y. Lee; M. A. Reynolds

1984-01-01

301

Validation of the MSG (Multidimensional Thermal-hydraulics Analysis Code for Steam Generators) for CFD Modelling of Sodium Heated Steam Generators  

Microsoft Academic Search

A CFD code, MSG (Multi-dimensional Thermal-hydraulics Analysis code for Steam Generators), which is optimized for the helical coil type steam generators of the MONJU Fast Breeder Reactor at Tsuruga, Japan, has been developed. The purpose of this study is to validate the MSG code against experimental data recorded at MONJU and at the 50 MW steam generator test facility (SGTF)

Peter METZ; Shinji YOSHIKAWA

2001-01-01

302

Wake Studies at the Flowind Vertical Axis Wind Turbine Generator Site.  

SciTech Connect

In a continuing effort to study and characterize various types and sizes of wind turbine generator wakes a test program was conducted at the FloWind 170 kW vertical axis wind turbine (VAWT) near Ellensburg, Washington. Oregon State University (OSU) scientists measured the wake behind the 90 ft. tall Darrieus VAWT using fixed place and portable kite anemometers. Downwind velocity deficits were measured from 3-9 diameters along the wake centerline at rotor midpoint (55 ft.) and perpendicular to the wake. Wake turbulence characteristics were also measured. The measured velocity deficits were compared to wake model calculations.

Baker, Robert W.; Walker, Stel Nathan; Katen, Paul C.

1984-03-01

303

Output Power Control of Wind Turbine Generator by Pitch Angle Control using Minimum Variance Control  

NASA Astrophysics Data System (ADS)

In recent years, there have been problems such as exhaustion of fossil fuels, e. g., coal and oil, and environmental pollution resulting from consumption. Effective utilization of renewable energies such as wind energy is expected instead of the fossil fuel. Wind energy is not constant and windmill output is proportional to the cube of wind speed, which cause the generated power of wind turbine generators (WTGs) to fluctuate. In order to reduce fluctuating components, there is a method to control pitch angle of blades of the windmill. In this paper, output power leveling of wind turbine generator by pitch angle control using an adaptive control is proposed. A self-tuning regulator is used in adaptive control. The control input is determined by the minimum variance control. It is possible to compensate control input to alleviate generating power fluctuation with using proposed controller. The simulation results with using actual detailed model for wind power system show effectiveness of the proposed controller.

Senjyu, Tomonobu; Sakamoto, Ryosei; Urasaki, Naomitsu; Higa, Hiroki; Uezato, Katsumi; Funabashi, Toshihisa

304

A Novel 500kW High-Speed Turbine PM Synchronous Generator Set for Distributed Power Generation  

NASA Astrophysics Data System (ADS)

The paper presents a power generation system based on the cogeneration of heat and electricity with a novel high speed turbogenerator. The machine consists of a single stage steam turbine and a directly coupled permanent magnet synchronous generator in one constructional unit. A PWM IGBT rectifier is the load to the generator and a PWM IGBT three-phase four-wire inverter feeds the power into the low voltage mains. In order to increase the turbine efficiency at light load, variable speed operation of the turbogenerator is realized. Different control schemes for mains parallel operation and stand alone operation are presented. The control schemes allow for the use of a lookup table based control with a speed-power-characteristic or for the use of a maximum power point tracker. Measurement results from the successfully tested turbogenerator set are presented.

Wendt, Sven; Benecke, Frank; Güldner, Henry

305

A nomogram method for estimating the energy produced by wind turbine generators  

Microsoft Academic Search

A simple nomogram is constructed to estimate the power generated by a wind turbine generator (WTG) operated at near maximum efficiency using optimum tip-speed ratio between cut-in and rated wind speed, and at constant power using optimum pitch control between rated and cut-out wind speed. The nomogram is based on information that is readily available for commercial WTGs as well

Anastasios Balouktsis; Dimitrios Chassapis; Thodoris D. Karapantsios

2002-01-01

306

Large Frame Gas Turbines, The Leading Technology of Power Generation Industries  

Microsoft Academic Search

In developing large-capacity gas turbines for use in power generation as the main machines in combined cycle power plants, MHI has made every effort to increase thermal efficiency. Since the 1980s when the commercial operation of power generation plants with a combustion temperature of 1 100 deg.C began, the combustion temperatures have been increasing at a rate of approximately 20

YASUSHI FUKUIZUMI; SHIGEHIRO SHIOZAKI; AKIMASA MUYAMA; SUMIU UCHIDA

307

Modeling a high output marine steam generator feedwater control system which uses parallel turbine-driven feed pumps  

NASA Astrophysics Data System (ADS)

Parallel turbine-driven feedwater pumps are needed when ships travel at high speed. In order to study marine steam generator feedwater control systems which use parallel turbine-driven feed pumps, a mathematical model of marine steam generator feedwater control system was developed which includes mathematical models of two steam generators and parallel turbine-driven feed pumps as well as mathematical models of feedwater pipes and feed regulating valves. The operating condition points of the parallel turbine-driven feed pumps were calculated by the Chebyshev curve fit method. A water level controller for the steam generator and a rotary speed controller for the turbine-driven feed pumps were also included in the model. The accuracy of the mathematical models and their controllers was verified by comparing their results with those from a simulator.

Qiu, Zhi-Qiang; Zou, Hai; Sun, Jian-Hua

2008-09-01

308

Hydraulic waste energy recovery, Phase 2  

SciTech Connect

The energy required for booster station operation is supplied by the electrical utility company and has an associated cost. Energy removed by pressure reducing valves in the system is lost or wasted. The objective of this project is to capture the wasted hydraulic energy with in-line turbines. In this application, the in-line turbines act as pressure reducing valves while removing energy from the water distribution system and converting it to electrical energy. The North Service Center pumping station was selected for the pilot program due to the availability of a wide range in pressure drop and flow, which are necessary for hydraulic energy recovery. The research performed during this project resulted in documentation of technical, economic, installation, and operational information necessary for local government officials to make an informed judgement as it relates to in-line turbine generation.

Not Available

1992-02-01

309

Subsynchronous resonance in turbine generators caused by faulty induction machines  

Microsoft Academic Search

Subsynchronous resonance phenomena (SSR) belong to the most severe incidents that occur in large synchron generators. The ultimate hazard of SSR is generator shaft fracture at rated speed. In addition personal safety is endangered. But as clearly shown in this paper, the actual protection measures for SSR are not sufficient because there exist more types of SSR than up to

Frank Joswig; Stefan Kulig

310

Design and construction of a thermophotovoltaic generator using turbine combustion gas  

SciTech Connect

This US Naval Academy project involves the development of a prototype thermophotovoltaic (TPV) generator that uses a General Electric T-58 helicopter gas turbine as the heat source. The goals of this project were to demonstrate the viability of using TPV and external combustion gases to generate electricity, and develop a system which could also be used for materials testing. The generator was modularly designed so that different materials could be tested at a later date. The combustion gas was tapped from the T-58`s combustor through one of the two igniter ports and extracted through a silicon carbide matrix ceramic composite tube into a similarly constructed ceramic composite radiant emitter. The ceramic radiant emitters is heated by the combustion gas via convection, and then serves the TPV generator by radiating the heat outwards where it can be absorbed by thermophotovoltaic cells and converted directly into electricity. The gas turbine and generator module are monitored by a data acquisition system that performs both data collection and control functions. This paper details the design of the TPV generator. It also gives results of initial tests with the gas turbine.

Erickson, T.A.; Lindler, K.W.; Harper, M.J. [Naval Academy, Annapolis, MD (United States). Dept. of Naval Architecture, Ocean, and Marine Engineering

1997-07-01

311

An optimal design of coreless direct-drive axial flux permanent magnet generator for wind turbine  

NASA Astrophysics Data System (ADS)

Different types of generators are currently being used in wind power technology. The commonly used are induction generator (IG), doubly-fed induction generator (DFIG), electrically excited synchronous generator (EESG) and permanent magnet synchronous generator (PMSG). However, the use of PMSG is rapidly increasing because of advantages such as higher power density, better controllability and higher reliability. This paper presents an innovative design of a low-speed modular, direct-drive axial flux permanent magnet (AFPM) generator with coreless stator and rotor for a wind turbine power generation system that is developed using mathematical and analytical methods. This innovative design is implemented in MATLAB / Simulink environment using dynamic modelling techniques. The main focus of this research is to improve efficiency of the wind power generation system by investigating electromagnetic and structural features of AFPM generator during its operation in wind turbine. The design is validated by comparing its performance with standard models of existing wind power generators. The comparison results demonstrate that the proposed model for the wind power generator exhibits number of advantages such as improved efficiency with variable speed operation, higher energy yield, lighter weight and better wind power utilization.

Ahmed, D.; Ahmad, A.

2013-06-01

312

Development of a Direct Drive Permanent Magnet Generator for Small Wind Turbines  

SciTech Connect

In this program, TIAX performed the conceptual design and analysis of an innovative, modular, direct-drive permanent magnet generator (PMG) for use in small wind turbines that range in power rating from 25 kW to 100 kW. TIAX adapted an approach that has been successfully demonstrated in high volume consumer products such as direct-drive washing machines and portable generators. An electromagnetic model was created and the modular PMG design was compared to an illustrative non-modular design. The resulting projections show that the modular design can achieve significant reductions in size, weight, and manufacturing cost without compromising efficiency. Reducing generator size and weight can also lower the size and weight of other wind turbine components and hence their manufacturing cost.

Chertok, Allan; Hablanian, David; McTaggart, Paul; DOE Project Officer - Keith Bennett

2004-11-16

313

Measures to reduce the level of vibrations of turbine-generator units  

SciTech Connect

Work are carried out on an umbrella-type SVCh 790/106-52 generator with one generator bearing located in the same oil bath with the thrust bearing through which the load is transmitted to the turbine cover, in order to determine the causes and to reduce the level of increased vibration. An analysis of the oscillograms obtained during the vibration tests show the causes of increased vibration. Deviations from the geometrically regular form of the bore of the generator stator were measured simultaneously through the ventilation channels of the rotor by means of a device consisting of a rod with a dial indicator fastened on it. The developed form of the rotor with respect to the poles and contour is given. The work on centering the unit with consideration of the natural sagging of the turbine block made it possible to reduce vibration of components of the unit by more than 50%.

Kolesnikov, V.I.; Dolgopolov, A.S.; Engel', V.E.

1987-01-01

314

A Parametric Study of the Thermal-Hydraulic Response of Supercritical Light Water Reactors During Loss-of-Feedwater and Turbine-Trip Events  

SciTech Connect

The Idaho National Engineering and Environmental Laboratory in investigating the feasibility of supercritical light water reactors for low-cost electric power production through a Nuclear Energy Research Initiative Project sponsored by the United State Department of Energy. The project is evaluating a variety of technical issues related to the fuel and reactor design, material corrosion, and safety characteristics. This paper presents the results of parametric calculations using the RELAP5 computer code to characterize the thermal-hydraulic response of supercritical reactors to transients initiated by loss-of-feedwater and turbine-trip events. The purpose of the calculations was to aid in the design of the safety systems by determining the time available for the safety systems to respond and their required capacities.

Cliff B. Davis; Jacopo Buongiorno; Philip E. MacDonald

2003-09-01

315

An Axial-Flux Permanent-Magnet Synchronous Generator for a Direct-Coupled Wind-Turbine System  

Microsoft Academic Search

This paper presents a unique axial-flux permanent-magnet synchronous generator (AFPMSG), which is suitable for both vertical-axis and horizontal-axis wind turbine generation systems. An outer-rotor design facilitates direct coupling of the generator to the wind turbine, while a coreless armature eliminates the magnetic pull between the stationary and moving parts. The design and construction features of the AFPMSG are reviewed. The

T. F. Chan; L. L. Lai

2007-01-01

316

Entropy generation in a channel resembling gas turbine cooling passage: Effect of rotation number and density ratio on entropy generation  

Microsoft Academic Search

Flow into a passage resembling a gas turbine blade cooling passage is considered and entropy generation rate in the passage\\u000a is examined for unique rotation number and density ratios. In the simulations, leading and trailing walls of the passage are\\u000a assumed to be at constant temperature. A control volume approach is introduced to discretize the governing equations of flow,\\u000a heat

M. Basha; M. Al-Qahtani; B. S. Yilbas

2009-01-01

317

A Stand-Alone Hybrid Generation System Combining Solar Photovoltaic and Wind Turbine with Simple Maximum Power Point Tracking Control  

Microsoft Academic Search

This paper proposes a hybrid energy system combing solar photovoltaic and wind turbine as a small-scale alternative source of electrical energy where conventional generation is not practical. A simple and cost effective control technique has been proposed for maximum power point tracking from the photovoltaic array and wind turbine under varying climatic conditions without measuring the irradiance of the photovoltaic

Nabil A. Ahmed; Masafumi Miyatake

2006-01-01

318

Power control of a grid-connected hybrid generation system with photovoltaic\\/wind turbine\\/battery sources  

Microsoft Academic Search

A grid-connected hybrid distributed generation system, composed of PV(photovoltaic) array, wind turbine and BESS (battery energy storage system), is proposed for various power transfer functions to the distribution network. The proposed system has several operation modes which are normal operation, power dispatching, and power averaging, according to coordinate control of the BESS and grid inverter. PV array and wind turbine

Jinhong Jeon; Seulki Kim; Changhee Cho; Jonbo Ahn; Jangmok Kim

2007-01-01

319

A Study of Transient Magnetic Fields in a Nacelle of a Wind Turbine Generator System due to Lightning  

Microsoft Academic Search

A wind turbine generator system is composed of blades, a nacelle, a tower etc. In recent year, to make the blades and the nacelle lighter, the blades are often made from GFRP (Glass Fiber Reinforced Plastics) and the nacelle is composed of steel grids and GFRP covering it. When the lightning strikes the wind turbine, the current flows into the

Kazuo Yamamoto; Tomohiro Chikara; Akihiro Ametani

2009-01-01

320

Investigation of vortex generators for augmentation of wind turbine power performance  

SciTech Connect

This study focuses on the use of vortex generators (VGs) for performance augmentation of the stall-regulated AWT-26 wind turbine. The goal was to design a VG array which would increase annual energy production (AEP) by increasing power output at moderate wind speeds, without adversely affecting the loads or stall-regulation performance of the turbine. Wind tunnel experiments were conducted at the University of Washington to evaluate the effect of VGs on the AWT-26 blade, which is lofted from National Renewable Energy Laboratory (NREL) S-series airfoils. Based on wind-tunnel results and analysis, a VG array was designed and then tested on the AWT-26 prototype, designated P1. Performance and loads data were measured for P1, both with and without VGs installed. the turbine performance with VGs met most of the design requirements; power output was increased at moderate wind speeds with a negligible effect on peak power. However, VG drag penalties caused a loss in power output for low wind speeds, such that performance with VGs resulted in a net decrease in AEP for sites having annual average wind speeds up to 8.5 m/s. While the present work did not lead to improved AEP for the AWT-2 turbine, it does provide insight into performance augmentation of wind turbines with VGs. The safe design of a VG array for a stall-regulated turbine has been demonstrated, and several issues involving optimal performance with VGs have been identified and addressed. 15 refs., 34 figs., 10 tabs.

Griffin, D.A. [Lynette (R.) and Associates, Seattle, WA (United States)

1996-12-01

321

Design of a 3 kW wind turbine generator with thin airfoil blades  

SciTech Connect

Three blades of a 3 kW prototype wind turbine generator were designed with thin airfoil and a tip speed ratio of 3. The wind turbine has been controlled via two control methods: the variable pitch angle and by regulation of the field current of the generator and examined under real wind conditions. The characteristics of the thin airfoil, called ''Seven arcs thin airfoil'' named so because the airfoil is composed of seven circular arcs, are analyzed with the airfoil design and analysis program XFOIL. The thin airfoil blade is designed and calculated by blade element and momentum theory. The performance characteristics of the machine such as rotational speed, generator output as well as stability for wind speed changes are described. In the case of average wind speeds of 10 m/s and a maximum of 19 m/s, the automatically controlled wind turbine ran safely through rough wind conditions and showed an average generator output of 1105 W and a power coefficient 0.14. (author)

Ameku, Kazumasa; Nagai, Baku M.; Roy, Jitendro Nath [Faculty of Mechanical Engineering, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213 (Japan)

2008-09-15

322

Method for changing removable bearing for a wind turbine generator  

DOEpatents

A wind generator having removable change-out bearings includes a rotor and a stator, locking bolts configured to lock the rotor and stator, a removable bearing sub-assembly having at least one shrunk-on bearing installed, and removable mounting bolts configured to engage the bearing sub-assembly and to allow the removable bearing sub-assembly to be removed when the removable mounting bolts are removed.

Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Scotia, NY); Gadre, Aniruddha Dattatraya (Rexford, NY)

2008-04-22

323

Electromagnetic design analysis and performance improvement of axial field permanent magnet generator for small wind turbine  

NASA Astrophysics Data System (ADS)

Axial field permanent magnet (AFPM) generators are widely applied for the small wind turbine. The output power of conventional AFPM generator, AFER-NS (Axial Field External Rotor-Non Slotted) generator, is limited by the large reluctance by the long air-gap flux paths. In this paper, the novel structure of AFPM generator, AFIR-S (Axial Field Inner Rotor-Slotted) generator, is suggested to improve the output characteristics. The electromagnetic design analysis and the design improvement of the suggested AFIR-S generator are studied. Firstly, the electromagnetic design analysis was done to increase the power density. Secondly, the design optimizations of the rotor pole-arc ratio and skew angle to increase the output power and to reduce the cogging torque. Finally, the output performances of AFER-NS and AFIR-S generator are compared with each other.

Jung, Tae-Uk

2012-04-01

324

Analysis on oscillation in electro-hydraulic regulating system of steam turbine and fault diagnosis based on PSOBP  

Microsoft Academic Search

The oscillation in electro-hydraulic regulating system is one of the main reasons leading to the oscillation of electric power system. In this article the influence of internal leakage and plugging of servo valve on the characteristic of the regulating system was analyzed. With the simulation in AMESIM it was found that the leakage of the power stage spool, the plugging

Xuanyin Wang; Xiaoxiao Li; Fushang Li

2010-01-01

325

Transient, Three-Dimensional, Finite-Element Analysis of Heat Flow in Turbine-Generator Rotors  

Microsoft Academic Search

The problem of three-dimensional, transient heat flow in the rotors of large turbine-generators is solved using a finite element formulation and employing new arch-shaped elements. Applications to negative sequence current heating and to rotor mechanical unbalance caused by thermal asymmetries are discussed. The method is shown to agree well with analytical calculations for heat flow in cylinders. Isothermal plots on

A. F. Armor

1980-01-01

326

A new dynamic strategy for improved ride-through capability of wind turbine generator  

Microsoft Academic Search

As the penetration of large-scale grid-connected wind farms increasing year by year, low voltage ride-through (LVRT) capability are required by many countries for power quality and fail-safe operation at grid fault. A new dynamic strategy using dynamic voltage restorer (DVR) is proposed in this paper to improve LVRT capability of wind turbine generators (WTGs). During the voltage dip, LVRT-DVR will

Yingdong Wei; Lucheng Hong; Qirong Jiang; Zhiyong Wang

2011-01-01

327

Direct and Quadrature-Axis Equivalent Circuits for Solid-Rotor Turbine Generators  

Microsoft Academic Search

Direct- and quadrature-axis equivalent circuits are developed for solid-rotor turbine generators. The equivalent circuits model, in considerable detail, important current-carrying paths in the rotor in addition to the excitation winding. Impedance equations are formulated so that a valid representation can be obtained over a wide range of frequencies. Operational solution of the equivalent circuits provides a powerful means for accurate

William Jackson; Robert Winchester

1969-01-01

328

Nonlinear Dual-Mode Control of Variable-Speed Wind Turbines With Doubly Fed Induction Generators  

Microsoft Academic Search

This paper presents a feedback\\/feedforward nonlinear controller for\\u000avariable-speed wind turbines with doubly fed induction generators. By\\u000aappropriately adjusting the rotor voltages and the blade pitch angle, the\\u000acontroller simultaneously enables: (a) control of the active power in both the\\u000amaximum power tracking and power regulation modes, (b) seamless switching\\u000abetween the two modes, and (c) control of the reactive

Choon Yik Tang; Yi Guo; John N. Jiang

2011-01-01

329

A new control method of permanent magnet generator for maximum power tracking in wind turbine application  

Microsoft Academic Search

This paper discusses a new and simple control method for maximum power tracking in a variable speed wind turbine by using a step-up dc-dc converter. The output voltage of permanent magnet generator is connected to a fixed dc-link through a three-phase rectifier and the dc-dc converter. A maximum power-tracking algorithm calculates the speed command that corresponds to maximum power output

R. Esmaili; L. Xu; D. K. Nichols

2005-01-01

330

High-Frequency Modeling and Simulation of Wind Turbine Transformer With Doubly Fed Asynchronous Generator  

Microsoft Academic Search

This paper investigates the high-frequency properties of a 3.14-MVA 35\\/1.0\\/0.4-kV wind turbine transformer commonly used for the doubly fed asynchronous generator. Frequency sweep measurements carried out for this transformer show that the voltage transfer from the 35-kV side to either of the two low-voltage taps is strongly dependent on the loading on the other tap. A frequency-dependent terminal equivalent model

Babak Badrzadeh; Bjørn Gustavsen

2012-01-01

331

First year of operation of the world's largest tandem-compound turbine-generator  

Microsoft Academic Search

The results gained from the comprehensive factory and field testing of the Biblis ''A'' turbine-generator, as well as the subsequent operational experience, greatly augment the knowledge derived from placing smaller machines in service and will be utilized to optimize the design of future KWU and A-CPSI nuclear-powered units. The majority of the future units lies in the capability range of

F. J. Spalthoff; H. Hass; F. Heinrichs

1976-01-01

332

Wind Turbine Generator System Power Quality Test Report for the Gaia Wind 11kW Wind Turbine  

Microsoft Academic Search

This report details the power quality test on the Gaia Wind 11-kW Wind Turbine as part of the U.S. Department of Energy's Independent Testing Project. In total five turbines are being tested as part of the project. Power quality testing is one of up to five test that may be performed on the turbines including power performance, safety and function,

A. Curtis; V. Gevorgian

2011-01-01

333

Dynamic response of a 330-kW horizontal axis wind turbine generator  

SciTech Connect

This report provides the results of a combined experimental and theoretical study of the dynamic response of a Howden 330/26 wind turbine generator. The work was undertaken to extend the current knowledge on the dynamic response of wind turbines, and to better understand 3-dimensional air-flow patterns. Tests involved performance and dynamic strain measurements on one of the three rotor blades and on the structural members of the wind turbine and its tower. Also, detailed measurements of the ambient wind inflow to the turbine were made using a vertical plane array of anemometers. The results of the tests were then compared with model predictions. In general, structural loads computed using the model were lower than their measured counterparts. Blade and mean flapwise loads, measured using time averaging, agreed reasonably with those derived from machine start/stop sequences. Tower steady bending loads, also measured from start/stop sequences, agreed fairly well with each other and with theoretical predictions using the dynamic response model. Power and wind speed are also much as predicted theoretically. Flow visualization was also conducted, where photographs were taken of the operating blade and correlated with real-time data records. Binned separation data produced convincing correlations. The measured separation point data were processed to yield lift coefficient values, which were compared with similarly processed separation data obtained from wind tunnel tufting studies. Stall appeared to be delayed on the blade, probably due to radial flow. 11 refs., 65 figs., 18 tabs.

Wehrey, M.; Redmond, I.; Anderson, C.; Jamieson, P.

1988-02-01

334

Wind Turbine Generator System Power Quality Test Report for the Gaia Wind 11-kW Wind Turbine  

SciTech Connect

This report details the power quality test on the Gaia Wind 11-kW Wind Turbine as part of the U.S. Department of Energy's Independent Testing Project. In total five turbines are being tested as part of the project. Power quality testing is one of up to five test that may be performed on the turbines including power performance, safety and function, noise, and duration tests. The results of the testing provide manufacturers with reports that may be used for small wind turbine certification.

Curtis, A.; Gevorgian, V.

2011-07-01

335

Modeling of the dynamic response of a Francis turbine  

NASA Astrophysics Data System (ADS)

The paper presents a detailed numerical model of the dynamic behaviour of a Francis turbine installed in a hydroelectric plant. The model considers in detail the Francis turbine with all the electromechanical subsystems, such as the main speed governor, the controller and the servo actuator of the turbine distributor, and the electrical generator. In particular, it reproduces the effects of pipeline elasticity in the penstock, the water inertia and the water compressibility on the turbine behaviour. The dynamics of the surge tank on low frequency pressure waves is also modelled together with the main governor speed loop and the position controllers of the distributor actuator and of the hydraulic electrovalve. Model validation has been made by means of experimental data of a 75 MW—470 m hydraulic head—Francis turbine acquired during some starting tests after a partial revamping, which also involved the control system of the distributor.

Pennacchi, Paolo; Chatterton, Steven; Vania, Andrea

2012-05-01

336

Heat Transfer and Flow on the First Stage Blade Tip of a Power Generation Gas Turbine, Part 1.  

National Technical Information Service (NTIS)

A combined computational and experimental study has been performed to investigate the detailed distribution of convective heat transfer coefficients on the first stage blade tip surface for a geometry typical of large power generation turbines(>100MW). Th...

A. A. Ameri J. C. Bailey R. S. Bunker

1999-01-01

337

Integration of permanent magnet synchronous generator wind turbines into power grid  

NASA Astrophysics Data System (ADS)

The world is seeing an ever-increasing demand for electrical energy. The future growth of electrical power generation needs to be a mix of technologies including fossil fuels, hydro, nuclear, wind, and solar. The federal and state energy agencies have taken several proactive steps to increase the share of renewable energy in the total generated electrical power. In 2005, 11.1% of the total 1060 GW electricity generation capacity was from Renewable Energy Sources (RES) in the US. The power capacity portfolio included 9.2% from hydroelectric, 0.87% from wind, and 0.7% from biomass. Other renewable power capacity included 2.8 GW of geothermal, 0.4 GW of solar thermal, and 0.2 GW of solar PV. Although the share of renewable energy sources is small compared with the total power capacity, they are experiencing a high and steady growth. The US is leading the world in wind energy growth with a 27% increase in 2006 and a projected 26% increase in 2007, according to the American Wind Energy Association (AWEA). The US Department of Energy benchmarked a goal to meet 5% of the nation's energy need by launching the Wind Powering America (WPA) program. Although renewable energy sources have many benefits, their utilization in the electrical grid does not come without cost. The higher penetration of RES has introduced many technical and non-technical challenges, including power quality, reliability, safety and protection, load management, grid interconnections and control, new regulations, and grid operation economics. RES such as wind and PV are also intermittent in nature. The energy from these sources is available as long as there is wind or sunlight. However, these are energies that are abundant in the world and the power generated from these sources is pollution free. Due to high price of foundation of wind farms, employing variable speed wind turbines to maximize the extracted energy from blowing wind is more beneficial. On the other hand, since wind power is intermittent, integrating energy storage systems with wind farms has attracted a lot of attention. These two subjects are addressed in this dissertation in detail. Permanent Magnet Synchronous Generators (PMSG) are used in variable speed wind turbines. In this thesis, the dynamic of the PMSG is investigated and a power electronic converter is designed to integrate the wind turbine to the grid. The risks of PMSG wind turbines such as low voltage ride through and short circuits, are assessed and the methods of mitigating the risks are discussed. In the second section of the thesis, various methods of smoothing wind turbine output power are explained and compared. Two novel methods of output power smoothing are analyzed: Rotor inertia and Super capacitors. The advantages and disadvantages of each method are explained and the dynamic model of each method is developed. The performance of the system is evaluated by simulating the wind turbine system in each method. The concepts of the methods of smoothing wind power can be implemented in other types of wind turbines such as Doubly Fed Induction Generator (DFIG) wind turbines.

Abedini, Asghar

338

Wind Turbine Generator System Duration Test Report for the Gaia-Wind 11 kW Wind Turbine  

Microsoft Academic Search

This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. This project was established to help reduce the barriers of wind energy expansion by providing independent testing results for small turbines. In total, five turbines are being tested at the National Renewable Energy Laboratory's (NRELs) National Wind Technology Center (NWTC) as a part of

A. Huskey; A. Bowen; D. Jager

2010-01-01

339

Wind Turbine Generator System Safety and Function Test Report for the Southwest Windpower H40 Wind Turbine  

Microsoft Academic Search

The objective of this test was to evaluate the safety and function characteristics of the Whisper H40 wind turbine. The general requirements of wind turbine safety and function tests are defined in the IEC standard WT01. The testing was conducted in accordance with the National Wind Technology Center (NWTC) Quality Assurance System, including the NWTC Certification Team Certification Quality Manual

J. van Dam; H. Link; M. Meadors; J. Bianchi

2002-01-01

340

DESIGN, FABRICATION, AND TESTING OF AN ADVANCED, NON-POLLUTING TURBINE DRIVE GAS GENERATOR  

SciTech Connect

The objectives of this report period were to continue the development of the Gas Generator design, to complete the hardware and ancillary hardware fabrication, and commence the Test Preparations for the testing of the non-polluting unique power turbine drive gas generator. Focus during this report period has been on testing the Gas Generator. Because of unacceptable delays encountered in a previously competitively selected test site, CES initiated a re-competition of our testing program and selected an alternate test site. Following that selection, CES used all available resources to make preparations for testing the 10 Mw Gas Generator at the new testing site facilities of NTS at Saugus, CA. A substantial portion of this report period was devoted to Testing Preparations, i.e. test facility development, cold- flow testing, calibration testing, performing igniter ignition testing, and then commencement of the completely assembled Gas Generator Assembly Testing, in process at this writing.

Unknown

2001-10-30

341

Measurement and prediction of broadband noise from large horizontal axis wind turbine generators  

NASA Astrophysics Data System (ADS)

A method is presented for predicting the broadband noise spectra of large wind turbine generators. It includes contributions from such noise sources as the inflow turbulence to the rotor, the interactions between the turbulent boundary layers on the blade surfaces with their trailing edges and the wake due to a blunt trailing edge. The method is partly empirical and is based on acoustic measurements of large wind turbines and airfoil models. Spectra are predicted for several large machines including the proposed MOD-5B. Measured data are presented for the MOD-2, the WTS-4, the MOD-OA, and the U.S. Windpower Inc. machines. Good agreement is shown between the predicted and measured far field noise spectra.

Grosveld, F. W.; Shepherd, K. P.; Hubbard, H. H.

1995-05-01

342

Power controller for a wind-turbine-driven tandem induction generator  

SciTech Connect

In this paper a controller for delivering either constant power or maximum power from a wind-turbine-driven grid connected induction generator with double stator windings, one fixed and the other able to be physically rotated, and a squirrel-cage rotor common to both stators is described. The load torque of the generator is controlled by varying the angular displacement between the two stators. The generator can feed power to the grid at variable speed and constant frequency and is termed a Tandem Induction Generator. Dynamic models for the wind energy conversion system are proposed for both controlled and uncontrolled operation to predict changes in shaft speed to shifts in wind speed using data pertaining to a commercial wind turbine. Results based on laboratory tests on a 1hp tandem machine driven by a dc motor demonstrating the feasibility of both controllers are presented. A steady state model of the tandem generator is also proposed and compared to measurements made on the test machine.

Perahia, J.; Nayar, C.V. (School of Electrical and Computer Engineering, Curtin Univ. of Technology, GPO Box U1987, Perth 6001 (AU))

1991-01-01

343

14 CFR 33.72 - Hydraulic actuating systems.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 2013-01-01 false Hydraulic actuating systems. 33.72 Section 33...Construction; Turbine Aircraft Engines § 33.72 Hydraulic actuating systems. Each hydraulic actuating system must function...

2013-01-01

344

Investigation of Control Strategies for Variable-Speed Pump-Turbine Units by Using a Simplified Model of the Converters  

Microsoft Academic Search

This paper presents the modeling, simulation, and analysis of the dynamic behavior of a fictitious 2 × 320 MW variable-speed pump-turbine power plant, including a hydraulic system, electrical equipment, rotating inertias, and control systems. The modeling of the hydraulic and electrical components of the power plant is presented. The dynamic performances of a control strategy in generating mode and one

Yves Pannatier; Basile Kawkabani; Christophe Nicolet; Jean-Jacques Simond; Alexander Schwery; Philippe Allenbach

2010-01-01

345

DESIGN, FABRICATION, AND TESTING OF AN ADVANCED, NON-POLLUTING TURBINE DRIVE GAS GENERATOR  

SciTech Connect

The objective of this report period was to continue the development of the Gas Generator design, completion of the hardware and ancillary hardware fabrication and commence the Test Preparations for the testing of the non-polluting unique power turbine driven Gas Generator. Focus during this report period has been on completing the Gas Generator fabrication of hardware and ancillary hardware, and completion of unit closeout brazing and bonding. Because of unacceptable delays encountered in a previously competitively selected test site, CES initiated a re-competition of our testing program and selected an alternate test site. Following that selection, CES used all available resources to make preparations for testing the 10 Mw Gas Generator at the new testing site facilities of NTS at Saugus, CA.

E.W. (Gene) Baxter

2002-06-30

346

A study on power system's transient stability in determination of the appropriate generator type for wind turbines: Comparison between fixed-speed induction generator equipped with energy storage system and doubly-fed induction generator  

Microsoft Academic Search

With an ever-increasing importance of wind power generation in power systems, the necessity of choosing the appropriate type of technology for the wind turbine generators becomes more significant. In the current paper, fixed and variable speed wind turbines and the application of energy storage system (ESS) to smoothen the wind farm output power are studied. A detailed analysis of the

Maryam Bahramipanah; Saeed Afsharnia; Azin Aslani

2011-01-01

347

Generating hydraulic properties from non-equilibrium water-retention curves  

NASA Astrophysics Data System (ADS)

Water retention curves, particularly those obtained from ceramic plate experiments, tend overestimate the equilibrium water content at high tensions and thus imply unrealistic amounts of water present in films etc. We have previously reported a method to predict non-equilibrium water-retention data from known fractal equilibrium water-retention curves. This method relates actual water loss to the product of the equilibrium water loss and the ratio of two different percolation-based calculations of the hydraulic conductivity. Here we reverse the process and generate the equilibrium water-retention curve from data. No particular form of pore- size distribution is assumed, although extrapolation procedures and a posteriori checks are used. The results we obtained make sense and imply water film contents of roughly 0.01 instead of 0.05 or higher in the coarse Hanford site soils investigated. From a reliable equilibrium pore-size distribution, percolation theory yields all flow and transport properties. Work supported by NSF grant EAR-0609884.

Hunt, A. G.; Skinner, T. E.

2008-12-01

348

Thermal-hydraulic characteristics of a Westinghouse Model 51 steam generator. Volume 2. Appendix A, numerical results. Interim report. [CALIPSOS code numerical data  

SciTech Connect

The Comparative Thermal-Hydraulic Evaluation of Steam Generators program represents an analytical investigation of the thermal-hydraulic characteristics of four PWR steam generators. The analytical tool utilized in this investigation is the CALIPSOS code, a three-dimensional flow distribution code. This report presents the steady state thermal-hydraulic characteristics on the secondary side of a Westinghouse Model 51 steam generator. Details of the CALIPSOS model with accompanying assumptions, operating parameters, and transport correlations are identified. Comprehensive graphical and numerical results are presented to facilitate the desired comparison with other steam generators analyzed by the same flow distribution code.

Fanselau, R.W.; Thakkar, J.G.; Hiestand, J.W.; Cassell, D.

1981-03-01

349

Installation and checkout of the DOE/NASA Mod-1 2000-kW wind turbine generator  

SciTech Connect

The Mod-1 wind turbine generator is the largest such machine ever built. It supplies up to 2000 kW of electricity to the Blue Ridge Electric Membership Corp. grid. The design and installation were performed by the General Electric Co. of Valley Forge, Pennsylvania, under contract to the NASA Lewis Research Center, who managed the program for the Department of Energy. The wind turbine consists of the turbine rotor, pitch-change mechanism, drive-train assembly, bedplate, yaw assembly, and tower. The turbine rotor operates at 35 rpm and generates 2000 kW of electricity in a 25.5-mph wind (at 30 ft). The entire system weighs 655,000 lb, 335,000 lb machine weight and 320,000 lb tower weight.

Puthoff, R.L.; Collins, J.L.; Wolf, R.A.

1980-01-01

350

Dynamic Torque Analysis of a Wind Turbine Drive Train Including a Direct-Driven Permanent-Magnet Generator  

Microsoft Academic Search

Mechanical interactions between a wind turbine and a direct-driven permanent-magnet synchronous generator (PMSG) are studied, and a model to analyze the system behavior is suggested. The proposed model can be applied to analyze the mechanical vibrations of direct-driven wind turbine installations both in steady state and in dynamic cases. The cogging torque and torque ripple of the PMSG are used

Jussi Sopanen; Vesa Ruuskanen; Janne Nerg; Juha Pyrhonen

2011-01-01

351

Energy and exergy analyses of an externally fired gas turbine (EFGT) cycle integrated with biomass gasifier for distributed power generation  

Microsoft Academic Search

Biomass based decentralized power generation using externally fired gas turbine (EFGT) can be a technically feasible option. In this work, thermal performance and sizing of such plants have been analyzed at different cycle pressure ratio (rp=2?8), turbine inlet temperature (TIT=1050–1350K) and the heat exchanger cold end temperature difference (CETD=200–300K). It is found that the thermal efficiency of the EFGT plant

Amitava Datta; Ranjan Ganguly; Luna Sarkar

2010-01-01

352

Candidate wind turbine generator site, Culebra, Puerto Rico. Annual data summary, January-December 1979  

SciTech Connect

This report summarizes wind speed and direction data collected on meteorological towers at 14 candidate and wind turbine generator installation sites from January 1979 through December 1979. The basic method of data collection is by digital data cassette recording systems. For the digital data reported, an instantaneous sample is recorded every 2 minutes. An explanation is included for each data summary table as well as information on how specific values were computed. The rest of the report presents the annual summarized data for each site.

None

1980-06-01

353

Effects of Capacitor Bank on Fault Ride Through Capability of Induction Generator Based Wind Turbines  

Microsoft Academic Search

Wind turbine installation is increasing rapidly. In some networks, wind power penetration is significantly high and the performance of wind turbine plays an important role in power system operation and control. Especially, the behavior of wind turbines during a power system disturbance would affect power system stability and supply security. Some existing wind turbines are still based on fixed speed

Y. Hu; Z. Chen

2010-01-01

354

Studies on a Wind Turbine Generating System that Employs a Thyristor Inverter  

NASA Astrophysics Data System (ADS)

A new wind turbine generating system that employs a current-source thyristor inverter is proposed, and the steady-state and dynamic performances for a practical system are discussed. The proposed system is essentially based on the shaft generator system that is widely used in large ships, and it has many features such as high reliability and generation of output power of high quality. It is shown that electric power with constant frequency and voltage with low distortion can be obtained by using this novel system despite the changes in the velocity of natural wind. A dynamic model of the system is also developed, and a good agreement between simulated and experimental performances is obtained, thereby confirming the validity of the model.

Nishikata, Shoji; Tatsuta, Fujio

355

Output Power Leveling of Wind Turbine Generator by EDLC Energy Storage System  

NASA Astrophysics Data System (ADS)

The increased renewable energy utilization, especially photovoltaic panels using solar energy or wind turbine generators (WTGs) using wind energy, has been expected in recent years from view point of CO2 gas emission reduction and environmental conservation. However, the generated power is always fluctuating because the WTGs are driven by fluctuating wind. Therefore, an energy storage system should be installed to compensate these fluctuating elements. The energy capacitor system (ECS) which combined the electric double-layer capacitor (EDLC) and the electronic circuits are now under development. In this paper, control system configuration for active and reactive output power simultaneous control and the bi-directional inverter using current source EDLC are proposed. Moreover, we discusse control methods required in generating-power leveling for WTGs, and show the effectiveness of the proposed system through simulations.

Kinjyo, Tatsuto; Senjyu, Tomonobu; Uezato, Katsumi; Fujita, Hideki

356

A preliminary study of power generation from vertical-axis turbines in the Gulf Stream  

NASA Astrophysics Data System (ADS)

A system consisting of paired, vertical axis turbines suspended from a tethered, buoyant, submerged platform that contains the generator is proposed as a method for power generation from the Gulf Stream. Drilled piles are the most likely kind of mooring system for the holding capacity needed. Successful extraction of electrical energy from the Gulf Stream requires consideration of the environment, as well as its effects on potential materials and surface features of the power generating system. Because of its topography, the region called the Straits of Florida contains the fastest flowing water masses (known as the Florida Current) found in the Gulf Stream system. The warm, fast flowing, deep, salty water contains myriad life forms, and presents a highly corrosive environment to most common building materials. The minimization of galvanic and crevice types of corrosion offers the most formidable challenge to the designer.

Carnicom, M. L.; Sheldahl, R. E.

1981-01-01

357

Torsional oscillations of unequally-loaded parallel identical turbine-generators  

SciTech Connect

The phenomenon of torsional oscillations of closely coupled parallel identical turbine-generator (T-G) units under unequal loading conditions is studied, and the damping effect of an SVC system on the torsional oscillations of the T-G sets is investigated. An eigenvalue method is used for the studies and the results are verified by detailed digital computer simulation, using the Electromagnetic Transients Program (EMTP). The studies show that under unequal loading conditions, the corresponding tortional oscillations of parallel identical T-G sets are not in-phase. Comparison of the results with those obtained based on representing the T-G sets by the so called equivalent-generator-model, indicates that the equivalent-generator-model is not a valid representation of unequally-loaded paralleled identical T-G sets.

Iravani, M.R. (Toronto Univ., ON (Canada). Dept. of Electrical Engineering)

1989-11-01

358

Wind turbine generators having wind assisted cooling systems and cooling methods  

DOEpatents

A wind generator includes: a nacelle; a hub carried by the nacelle and including at least a pair of wind turbine blades; and an electricity producing generator including a stator and a rotor carried by the nacelle. The rotor is connected to the hub and rotatable in response to wind acting on the blades to rotate the rotor relative to the stator to generate electricity. A cooling system is carried by the nacelle and includes at least one ambient air inlet port opening through a surface of the nacelle downstream of the hub and blades, and a duct for flowing air from the inlet port in a generally upstream direction toward the hub and in cooling relation to the stator.

Bagepalli, Bharat (Niskayuna, NY); Barnes, Gary R. (Delanson, NY); Gadre, Aniruddha D. (Rexford, NY); Jansen, Patrick L. (Scotia, NY); Bouchard, Jr., Charles G. (Schenectady, NY); Jarczynski, Emil D. (Scotia, NY); Garg, Jivtesh (Cambridge, MA)

2008-09-23

359

Water turbine technology for small power stations  

NASA Astrophysics Data System (ADS)

The paper examines hydro-power stations and the efficiency and costs of using water turbines to run them. Attention is given to different turbine types emphasizing the use of Kaplan-turbines and runners. Hydraulic characteristics and mechanical properties of low head turbines and small turbines, constructed of fully fabricated steel plate structures, are presented.

Salovaara, T.

1980-02-01

360

Optimized design of a back-to-back rotor-side converter for doubly fed induction generator equipped Wind turbines  

Microsoft Academic Search

The paper approaches the analysis of the performances of doubly-fed induction generators for grid-connected wind turbines by means of algebraic analytical relationships given by the mathematical model of the machine. These relationships are used to carry out a control strategy which aims to maximize the global efficiency of the generation system. Some considerations about the sizing of the rotor converter

L. Piegari; R. Rizzo; P. Tricoli

2009-01-01

361

Design of a nonlinear robust adaptive controller for a Grid-connected Doubly-Fed Induction Generator Wind turbine  

Microsoft Academic Search

A robust adaptive nonlinear controller is designed for a Doubly-Fed Induction Generator (DFIG) wind turbine supplying a power grid. The controller main objective is to guarantee that the generator active and reactive power are kept constant despite grid voltage and frequency variations. A model based control design method is proposed. The controller structure and equations are obtained following a backstepping

Francis A. Okou; Ouassima Akhrif; Mohammed Tarbouchi

2010-01-01

362

Comparison of the response of doubly fed and fixed-speed induction generator wind turbines to changes in network frequency  

Microsoft Academic Search

Synchronous and fixed-speed induction generators release the kinetic energy of their rotating mass when the power system frequency is reduced. In the case of doubly fed induction generator (DFIG)-based wind turbines, their control system operates to apply a restraining torque to the rotor according to a predetermined curve with respect to the rotor speed. This control system is not based

J. Ekanayake; N. Jenkins

2004-01-01

363

Short term hydroelectric power system scheduling with wind turbine generators using the multi-pass iteration particle swarm optimization approach  

Microsoft Academic Search

This paper uses multi-pass iteration particle swarm optimization (MIPSO) to solve short term hydroelectric generation scheduling of a power system with wind turbine generators. MIPSO is a new algorithm for solving nonlinear optimal scheduling problems. A new index called iteration best (IB) is incorporated into particle swarm optimization (PSO) to improve solution quality. The concept of multi-pass dynamic programming is

Tsung-Ying Lee

2008-01-01

364

Numerical Electromagnetic Field Analysis of Transient Magnetic Fields in a Nacelle Caused by a Lightning Stroke to a Wind Turbine Generator System  

Microsoft Academic Search

The damages caused by lightning are particularly severe in the case of wind turbine generator systems. The nacelle is composed of steel grids covered with GFRP (glass-fiber reinforced plastics) in order to reduce its weight. When lightning strikes a wind turbine generator system, the current thus generated flows into the ground through down conductors in the blades, the steel grids

K. Yamamoto; T. Chikara; A. Ametani

2009-01-01

365

ARE660 Wind Generator: Low Wind Speed Technology for Small Turbine Development  

SciTech Connect

This project is for the design of a wind turbine that can generate most or all of the net energy required for homes and small businesses in moderately windy areas. The purpose is to expand the current market for residential wind generators by providing cost effective power in a lower wind regime than current technology has made available, as well as reduce noise and improve reliability and safety. Robert W. Preus’ experience designing and/or maintaining residential wind generators of many configurations helped identify the need for an improved experience of safety for the consumer. Current small wind products have unreliable or no method of stopping the wind generator in fault or high wind conditions. Consumers and their neighbors do not want to hear their wind generators. In addition, with current technology, only sites with unusually high wind speeds provide payback times that are acceptable for the on-grid user. Abundant Renewable Energy’s (ARE) basic original concept for the ARE660 was a combination of a stall controlled variable speed small wind generator and automatic fail safe furling for shutdown. The stall control for a small wind generator is not novel, but has not been developed for a variable speed application with a permanent magnet alternator (PMA). The fail safe furling approach for shutdown has not been used to our knowledge.

Robert W. Preus; DOE Project Officer - Keith Bennett

2008-04-23

366

Performance analysis of a counter-rotating tubular type micro-turbine by experiment and CFD  

NASA Astrophysics Data System (ADS)

Micro hydraulic turbines have a growing interest because of its small and simple structure, as well as a high possibility of using in micro and small hydropower applications. The differential pressure existing in city water pipelines can be used efficiently to generate electricity in a way similar to that of energy being generated through gravitational potential energy in dams. The pressure energy in the city pipelines is often wasted by using pressure reducing valves at the inlet of water cleaning centers. Instead of using the pressure reducing valves, a micro counter-rotating hydraulic turbine can be used to make use of the pressure energy. In the present paper, a counter-rotating tubular type micro-turbine is studied, with the front runner connected to the generator stator and the rear runner connected to the generator rotor. The performance of the turbine is investigated experimentally and numerically. A commercial ANSYS CFD code was used for numerical analysis.

Lee, N. J.; Choi, J. W.; Hwang, Y. H.; Kim, Y. T.; Lee, Y. H.

2012-11-01

367

Hydraulic waste energy recovery, Phase 2. A technical report  

SciTech Connect

The energy required for booster station operation is supplied by the electrical utility company and has an associated cost. Energy removed by pressure reducing valves in the system is lost or wasted. The objective of this project is to capture the wasted hydraulic energy with in-line turbines. In this application, the in-line turbines act as pressure reducing valves while removing energy from the water distribution system and converting it to electrical energy. The North Service Center pumping station was selected for the pilot program due to the availability of a wide range in pressure drop and flow, which are necessary for hydraulic energy recovery. The research performed during this project resulted in documentation of technical, economic, installation, and operational information necessary for local government officials to make an informed judgement as it relates to in-line turbine generation.

Not Available

1992-02-01

368

Development of a High Pressure/High Temperature Down-hole Turbine Generator  

SciTech Connect

As oil & natural gas deposits become more difficult to obtain by conventional means, wells must extend to deeper more heat-intensive environments. The technology of the drilling equipment required to reach these depths has exceeded the availability of electrical power sources needed to operate these tools. Historically, logging while drilling (LWD) and measure while drilling (MWD) devices utilized a wireline to supply power and communication from the operator to the tool. Lithium ion batteries were used in scenarios where a wireline was not an option, as it complicated operations. In current downhole applications, lithium ion battery (LIB) packs are the primary source for electrical power. LIB technology has been proven to supply reliable downhole power at temperatures up to 175 °C. Many of the deeper well s reach ambient temperatures above 200 °C, creating an environment too harsh for current LIB technology. Other downfalls of LIB technology are cost, limitations on charge cycles, disposal issues and possible safety hazards including explosions and fires. Downhole power generation can also be achieved by utilizing drilling fluid flow and converting it to rotational motion. This rotational motion can be harnessed to spin magnets around a series of windings to produce power proportional to the rpm experienced by the driven assembly. These generators are, in most instances, driven by turbine blades or moyno-based drilling fluid pumps. To date, no commercially available downhole power generators are capable of operating at ambient temperatures of 250 °C. A downhole power g enerator capable of operation in a 250 °C and 20,000 psi ambient environment will be an absolute necessity in the future. Dexter Magnetic Technologies’ High-Pressure High-Temperature (HPHT) Downhole Turbine Generator is capable of operating at 250 °C and 20, 000 psi, but has not been tested in an actual drilling application. The technology exists, but to date no company has been willing to test the tool.

Ben Plamp

2008-06-30

369

Wind Turbine Generator System Power Performance Test Report for the Gaia-Wind 11-kW Wind Turbine  

SciTech Connect

This test was conducted as part of the U.S. Department of Energy's (DOE) Independent Testing project. It is a power performance test that the National Renewable Energy Laboratory (NREL) conducted on the Gaia-Wind 11-kW small wind turbine.

Huskey, A.; Bowen, A.; Jager, D.

2009-12-01

370

Cogging Torque Reduction in a Permanent Magnet Wind Turbine Generator: Preprint  

SciTech Connect

In this paper, we investigate three design options to minimize cogging torque: uniformity of air gap, pole width, and skewing. Although the design improvement is intended for small wind turbines, it is also applicable to larger wind turbines.

Muljadi, E.; Green, J.

2002-01-01

371

Cost and Benefit Analysis of Hydraulic Fluid Systems for the Next Generation of Tactical Aircraft.  

National Technical Information Service (NTIS)

This study analyzed the life cycle costs, cost of fires, and benefits of using a new nonflammable hydraulic fluid (CTFE) in future tactical aircraft versus a fire retardant fluid (Mil-H-83282) currently used in tactical aircraft. The study assumed that fu...

M. P. Mahony

1987-01-01

372

Assessment and enhancement of grid fault-induced torsional oscillations for induction generator-based wind turbines  

Microsoft Academic Search

This paper investigates the torsional levels of the doubly-fed induction generator (DFIG) and the fixed speed induction generator (FSIG) initiated by network faults. The inclusion of the turbine-generator mutual damping is investigated for the DFIG, and FSIG. For the DFIG the significance of a detailed representation of the grid-side input filter and the DC-link capacitor are studied. A method is

Babak Badrzadeh; S. K. Salman; K. S. Smith

2009-01-01

373

Comparison and Evaluation of Induction Generator Models in Wind Turbine Systems for Transient Stability of Power System  

Microsoft Academic Search

In order to analyze the transient stability of grid-connected squirrel cage induction generators (SCIG) in wind power generating systems, various mathematical models, including the detailed and reduced generator models as well as the one-mass and two-mass shaft system models, are studied in this paper. Based on the different wind turbine system models, the dynamic behaviors are simulated and compared by

H. Liiswiththeschool; Z. Chen; L. Haniswiththeschool

2006-01-01

374

Optimal Cycle Scheme of Direct Cycle Supercritical CO2 Gas Turbine for Nuclear Power Generation Systems  

Microsoft Academic Search

A supercritical CO2 turbine cycle can achieve a considerably high cycle thermal efficiency at medium turbine inlet temperatures of 500-650°C at high pressure such as 20 MPa, which is too high to produce a reactor pressure vessel within the existing fabrication limits. To solve this problem, a dual expansion turbine cycle is effective; its application was examined for both the

Yasushi Muto; Yasuyoshi Kato

2008-01-01

375

Steam Turbines  

NASA Astrophysics Data System (ADS)

Turbonetics Energy, Inc.'s steam turbines are used as power generating systems in the oil and gas, chemical, pharmaceuticals, metals and mining, and pulp and paper industries. The Turbonetics line benefited from use of NASA research data on radial inflow steam turbines and from company contact with personnel of Lewis Research Center, also use of Lewis-developed computer programs to determine performance characteristics of turbines.

1981-01-01

376

Development of a High-Pressure/High-Temperature Downhole Turbine Generator  

SciTech Connect

The objective of this project as originally outlined has been to achieve a viable downhole direct current (DC) power source for extreme high pressure, high temperature (HPHT) environments of >25,000 psi and >250 C. The Phase I investigation posed and answered specific questions about the power requirements, mode of delivery and form factor the industry would like to see for downhole turbine generator tool for the HPHT environment, and noted specific components, materials and design features of that commercial system that will require upgrading to meet the HPHT project goals. During the course of Phase I investigation the scope of the project was HPHT downhole DC power. Phase I also investigated the viability of modifying a commercial expanded, without additional cost expected to the project, to include the addition of HT batteries to the power supply platform.

Timothy F. Price

2007-02-01

377

Axial-flux modular permanent-magnet generator with a toroidal winding for wind-turbine applications  

SciTech Connect

Permanent-magnet (PM) generators have been used for wind turbines for many years. Many small wind-turbine manufacturers use direct-drive PM generators. For wind-turbine generators, the design philosophy must cover the following characteristics: low cost, light weight, low speed, high torque, and variable-speed generation. The generator is easy to manufacture and the design can be scaled up for a larger size without major retooling. A modular PM generator with axial flux direction was chosen. The permanent magnet used is NdFeB or ferrite magnet with flux guide to focus flux density in the air gap. Each unit module of the generator may consist of one, two, or more phases. Each generator can be expanded to two or more unit modules. Each unit module is built from simple modular poles. The stator winding is formed like a torus. Thus, the assembly process is simplified and the winding insertion in the slot is less tedious. The authors built a prototype of one unit module and performed preliminary tests in the laboratory. Follow-up tests will be conducted in the laboratory to improve the design.

Muljadi, E.; Butterfield, C.P.; Wan, Y.H.

1999-08-01

378

Analytical determination of steady-state converter control laws for wind turbines equipped with doubly fed induction generators  

Microsoft Academic Search

This paper presents an analytical method for the determination of the steady state control laws of the doubly-fed induction generators (DFIG) used in wind turbines. The analytical model is used to derive the converter control laws of the DFIG in terms of voltage and control angle on the whole operation speed range. The method can be efficiently implemented in a

Davide Aguglia; Philippe Viarouge; René Wamkeue; Jérôme Cros

2008-01-01

379

Control coordination of a wind turbine generator and a battery storage unit in a Remote Area Power Supply system  

Microsoft Academic Search

A novel hybrid Remote Area Power Supply (RAPS) system consisting of a Doubly Fed Induction Generator (DFIG) based wind turbine and a battery Energy Storage System (ESS) is investigated in this paper. The proposed RAPS system also consists of a dummy load and its controller. The battery energy storage system is used as a buffer which is connected to the

Nishad Mendis; Kashem M. Muttaqi; S. Sayeef; S. Perera

2010-01-01

380

Design of grid-connected to rotor type Doubly-Fed Induction Generators for wind turbine system  

Microsoft Academic Search

Doubly-Fed Induction Generators (DFIGs) are widely used for modern wind turbines. Although the stator winding of DFIG is directly connected to a grid while a rotor winding is connected to converters, it has a large outer size because of the high current in the stator winding. This paper proposes a grid-connected to a rotor type DFIG where rotor winding is

Sang-hoon Kim; Yong-min You; T.A. Lipo; Byung-il Kwon

2010-01-01

381

Low Voltage Ride Through(LVRT) control strategy of grid-connected variable speed Wind Turbine Generator System  

Microsoft Academic Search

In this paper, a Low Voltage Ride Through (LVRT) control strategy for variable speed full scale Wind Turbine Generator System (WTGS) is proposed. Grid- connected wind power system should satisfy LVRT requirement when grid fault occur, and the variable speed full scale WTGS has advantage of satisfying LVRT compared with the fixed speed WTGS. The proposed LVRT control strategy satisfies

Hojoon Shin; Hyun-Sam Jung; Seung-Ki Sul

2011-01-01

382

Dynamic modeling of GE 1.5 and 3.6 MW wind turbine-generators for stability simulations  

Microsoft Academic Search

GE power systems has an ongoing effort dedicated to development of models of GE wind turbine generators (WTG) suitable for use in system impact studies. This paper documents the present recommendations for dynamic modeling of the GE 1.5 and 3.6 MW WTG for use in system impact studies. The paper includes recommended model structure and data, as well the assumptions,

N. W. Miller; J. J. Sanchez-Gasca; W. W. Price; R. W. Delmerico

2003-01-01

383

Control of a doubly fed induction generator in a wind turbine during grid fault ride-through  

Microsoft Academic Search

This paper analyzes the ability of a doubly fed induction generator (DFIG) in a wind turbine to ride through a grid fault and the limitations to its performance. The fundamental difficulty for the DFIG in ride-through is the electromotive force (EMF) induced in the machine rotor during the fault, which depends on the dc and negative sequence components in the

Dawei Xiang; Li Ran; P. J. Tavner; S. Yang

2006-01-01

384

Active power maximizing for Wind Electrical Energy Generating Systems moved by a Modular Multiple Blade Fixed Pitch Wind Turbine  

Microsoft Academic Search

This paper proposes a new solution for wind electrical energy generating system (WEEGS). The system here taken into account is moved by a modular multiple blade fixed pitch wind turbine (MMBFPWT) and foresees a new MPPT algorithm whose main characteristics are low cost, low noise, buildings simplicity and modularity. The mathematical model of the entire WEEGS has been here developed

V. Cecconi; V. Di Dio; A. O. Di Tommaso; S. Di Tommaso; D. La Cascia; R. Miceli

2008-01-01

385

Modeling and control of the wind turbine with the Direct Drive Permanent Magnet Generator integrated to power grid  

Microsoft Academic Search

In this paper, a model of the wind turbine (WT) with direct-drive permanent magnet generator (DDPMG) and its associated controllers is presented, based on which a small signal model is derived. The small signal stability analysis shows that the WT with DDPMG with the proposed controller is stable. To evaluate the control capability of the proposed controller, simulations are performed

Feng Wu; Xiao-Ping Zhang; Ping Ju

2008-01-01

386

Infrared thermal wave nondestructive testing for rotor blades in wind turbine generators non-destructive evaluation and damage monitoring  

Microsoft Academic Search

The rotor blades are key components in wind turbine generators. A visual inspection of the laminated shells for delaminations, air pockets, missing\\/disoriented fabric etc. is in most cases also not possible due to the manufacturing process, so Non-destructive testing and evaluation (NDT & E) techniques for assessing the integrity of rotor blades structure are essential to both reduce manufacturing costs

Shi Bin Zhao; Cun-Lin Zhang; Nai-Ming Wu; Yu-Xia Duan; Hao Li

2009-01-01

387

Macroscopic cross section generation and application for coupled spatial kinetics and thermal hydraulics analysis with SAS-DIF3DK  

SciTech Connect

This paper discusses the importance of modeling the transient behavior of multigroup cross sections in the context of coupled reactor physics and thermal-hydraulic computations with the SAS-DIF3DK computer code. The MACOEF macroscopic cross section methodology is presented. Results from benchmark verification calculations with a continuous-energy Monte Carlo are reported. Analysis of the Chernobyl accident is made using correlated WIMS-D4M generated group constants with special emphasis placed on the impact of modeling assumptions on the progression of the accident simulation.

Turski, R.B.; Morris, E.E.; Taiwo, T.A.; Cahalan, J.E.

1997-08-01

388

Experience and assessment of the DOE-NASA Mod-1 2000-kilowatt wind turbine generator at Boone, North Carolina  

SciTech Connect

The broad objectives of the Mod-1 program are defined, including the background information leading to the inception of the program. Activities on the Mod-1 program began in 1974, and the turbine was dedicated in July 1979. Rated power generation was accomplished in February 1980. The Mod-1 wind turbine is described in this report. In addition to the steel blade operated on the wind turbine, a composite blade was designed and manufactured. During the early phase of the manufacturing cycle a Mod-1A configuration was designed that identified concepts such as partial span control, a soft tower, and upwind teetered rotors that have been incorporated in second- and third-generation industry designs. The Mod-1 electrical system performed as designed, with voltage flicker characteristics within acceptable utility limits. Power output versus wind speed has equaled or exceeded design predictions. The wind turbine control system was operated successfully at the site and remotely from the utility dispatcher's office in Lenior, NC. During wind turbine operations, television interference was experienced by the local residents. As a consequence, operations were restricted. Although not implemented, two potential solutions were identified. In addition to television interference, a few local residents complained about objectionable sound, particularly the thump as the blade passed behind the tower. To eliminate the residents' objections, the sound generation level was reduced by 10 dB by reducing the rotor speed from 35 rpm to 23 rpm. During January 1981, bolts in the drive train fractured. A solution has been identified but not implemented as yet. During the past 2 years the public reaction toward the Mod-1 Turbine program has been overwhelmingly favorable. This includes the vast majority of Boone residents.

Collins, J.L.; Shaltens, R.K.; Poor, R.H.; Barton, R.S.

1982-04-01

389

Energy generating device  

SciTech Connect

A device for generating power from the energy of waves in a body of liquid employs a buoyant reaction element and at least one displacement element which can move back and forth to react against the reaction element. The movement of the displacement element which is caused by the cyclic application of wave forces is converted into a more readily usable form by a turbine driven by the flow of air or hydraulic fluid caused by the movement of the displacement element. Where the air or hydraulic flow is bidirectional, the turbine can be of the self-rectifying type so that it is driven unidirectionally. The turbine may, for example, drive a generator that produces electrical power. Where a plurality of displacement elements are employed, some of the displacement elements are arranged to be out of phase relative to others of the displacement elements.

Wood, E.

1984-05-15

390

MOD-5A wind turbine generator program design report: Volume 1: Executive Summary  

NASA Astrophysics Data System (ADS)

The design, development and analysis of the 7.3 MW MOD-5A wind turbine generator covering work performed between July 1980 and June 1984 is discussed. The report is divided into four volumes: Volume 1 summarizes the entire MOD-5A program, Volume 2 discusses the conceptual and preliminary design phases, Volume 3 describes the final design of the MOD-5A, and Volume 4 contains the drawings and specifications developed for the final design. Volume 1, the Executive Summary, summarizes all phases of the MOD-5A program. The performance and cost of energy generated by the MOD-5A are presented. Each subsystem - the rotor, drivetrain, nacelle, tower and foundation, power generation, and control and instrumentation subsystems - is described briefly. The early phases of the MOD-5A program, during which the design was analyzed and optimized, and new technologies and materials were developed, are discussed. Manufacturing, quality assurance, and safety plans are presented. The volume concludes with an index of volumes 2 and 3.

1984-08-01

391

Fiber composite retaining rings for turbine-driven generators. Volume 1: material development. Final report  

SciTech Connect

The overall objectives of the Fiber Composite Retaining Rings for Turbine Driven Generators Program were to develop composite design data, construction techniques and methods of attachment that would support the application of graphite epoxy composites for electrical generator retaining rings. The contractor's approach to the design of an optimum graphite epoxy composite retaining ring involved a combined finite element analysis and material testing effort. The initial phase of this program (Material Development) dealt exclusively with development of the conventional strength of materials parameters under loading conditions representative of intended service requirements as well as special considerations related to the development of rational strength and fracture criteria for composites. Notched body, cracked body and combined mode loading considerations were addressed. The role of nondestructive testing in the characterizing of composite structure quality and overall structural integrity considerations was also included. Results from the vast number and variety of tests conducted in Phase I of the project combined to support the application of graphite epoxy composites for electrical generator retaining rings.

Logsdon, W.A.; Marloff, R.H.; Kim, D.S.

1982-10-01

392

Dynamic behavior of a stand-alone hybrid power generation system of wind turbine, microturbine, solar array and battery storage  

Microsoft Academic Search

This paper presents dynamic behavior and simulation results in a stand-alone hybrid power generation system of wind turbine, microturbine, solar array and battery storage. The hybrid system consists of a 195xa0;kW wind turbine, an 85xa0;kW solar array; a 230xa0;kW microturbine and a 2.14xa0;kAh lead acid battery pack optimized based on economic analysis using genetic algorithm (GA). At first, a developed

M. Kalantar

2010-01-01

393

A Novel Control Strategy for a Variable-Speed Wind Turbine With a Permanent-Magnet Synchronous Generator  

Microsoft Academic Search

This paper presents a novel control strategy for the operation of a direct-drive permanent-magnet synchronous-generator-based stand-alone variable-speed wind turbine. The control strategy for the generator-side converter with maximum power extraction is presented. The stand-alone control is featured with output voltage and frequency controller that is capable of handling variable load. The potential excess of power is dissipated in the dump-load

Michael Negnevitsky; Kashem M. Muttaqi

2010-01-01

394

Candidate wind-turbine-generator site summarized meteorological data for December 1976-December 1981. [Program WIND listed  

SciTech Connect

Summarized hourly meteorological data for 16 of the original 17 candidate and wind turbine generator sites collected during the period from December 1976 through December 1981 are presented. The data collection program at some individual sites may not span this entire period, but will be contained within the reporting period. The purpose of providing the summarized data is to document the data collection program and provide data that could be considered representative of long-term meteorological conditions at each site. For each site, data are given in eight tables and a topographic map showing the location of the meteorological tower and turbine, if applicable. Use of information from these tables, along with information about specific wind turbines, should allow the user to estimate the potential for long-term average wind energy production at each site.

Sandusky, W.F.; Renne, D.S.; Hadley, D.L.

1982-09-01

395

Wind shear for large wind turbine generators at selected tall tower sites  

SciTech Connect

The objective of the study described in this report is to examine the nature of wind shear profiles and their variability over the height of large horizontal-axis wind turbines and to provide information on wind shear relevant to the design and opertion of large wind turbines. Wind turbine fatigue life and power quality are related through the forcing functions on the blade to the shapes of the wind shear profiles and their fluctuations over the disk of rotation.

Elliott, D.L.

1984-04-01

396

The Effect of Wind Speed at the Top of the Tower on the Performance and Energy Generated from _THERMOSYPHON Solar Turbine  

NASA Astrophysics Data System (ADS)

Energy generated from wind turbine depends to a great extent on the wind speed at its inlet. The use of thermosyphon solar tower is an attempt to increase the air velocity at inlet of the wind turbine and of course to increase its power. The wind speed in a certain location changes always with time and with the height above ground surface. In this work, the effect of wind speed at the top of the tower on the performance as well as on the energy generated from thermosyphon solar turbine was studied theoretically. One location in Egypt was chosen for this study. The calculations were achieved mainly with the solar turbine located at tower bottom. For the purpose of comparison, the energy generated from the solar turbine was compared with that generated from free wind turbine at tower height with the absence of solar tower. It was found that, the wind speed at the top of the tower results in a pressure drop which affects the performance of the thermosyphon solar turbine. This pressure drop increases with the rise in wind speed and will be zero only when the wind speed at the top of the tower reaches zero. It was found also that, there is an increase in friction losses through the tower and a decrease in both temperature difference between inlet and outlet of the tower and in heat losses from tower walls with the rise in wind speed in location. The inlet air velocity to the solar turbine and consequently its specific power were found to be increased with the increase in wind speed at the top of the tower. Therefore, the effect of wind speed at the top of the tower must be taken into account during thermosyphon solar tower calculations. By comparing the performance of solar turbine and the free wind turbine located at tower height with the absence of thermosyphon solar tower, it was found that the mean inlet air velocity to the solar turbine located at tower bottom and consequently its specific power are higher than these values for free wind turbine. The mean inlet air velocity to the solar turbine is found to be 117% of its value for a free wind turbine. The yearly specific energy generated from solar turbine is expected to be 157% of its value for free wind turbine.

El-Haroun, A. A.

2002-01-01

397

Issues regarding cost estimation of permanent magnet synchronous generators for megawatt level wind turbines  

Microsoft Academic Search

Wind turbines with higher power ratings are desired to reduce construction and maintenance time and increase energy yields. Wind turbines with low energy yield and high capital cost present a setback that needs to be overcome. This paper addresses research questions associated with the method by which the energy per cost is calculated. It aims at presenting more accurate calculations

Salem Alshibani; Vassilios G. Agelidis

2011-01-01

398

Flow Analysis of Straight Wing Vertical Axis Type Wind Turbine for Power Generation  

NASA Astrophysics Data System (ADS)

Researches about the aerodynamics of wind turbine with straight wing vertical axis(SW-VAWT)are very limited, in spite of a number of advantages such as low dependence on wind direction variation and easy constructible straight blades. For these reasons, we are researching the lift type SW-VAWT for many years. The elucidation of the behavior of the flow inside and neighborhood of the wind turbine during the rotation is very important because of the performance improvement of the vertical axis wind turbine. This research examined to the aerofoil characters by using the numerical simulation technique and the precision of the prediction technique was confirmed as this result. Furthermore, we estimated flow behavior during the wind turbine rotation by using this numerical simulation technique, and evaluated the flow around the wind turbine. This paper presents outline and results of these calculations and evaluations.

Horiuchi, Kenji; Seki, Kazuichi

399

Power generation costs and ultimate thermal hydraulic power limits in hypothetical advanced designs with natural circulation  

SciTech Connect

Maximum power limits for hypothetical designs of natural circulation plants can be described analytically. The thermal hydraulic design parameters are those which limit the flow, being the elevations, flow areas, and loss coefficients. WE have found some simple ``design`` equations for natural circulation flow to power ratio, and for the stability limit. The analysis of historical and available data for maximum capacity factor estimation shows 80% to be reasonable and achievable. The least cost is obtained by optimizing both hypothetical plant performance for a given output,a nd the plant layout and design. There is also scope to increase output and reduce cost by considering design variations of primary and secondary pressure, and by optimizing component elevations and loss coefficients. The design limits for each are set by stability and maximum flow considerations, which deserve close and careful evaluation.

Duffey, R.B.; Rohatgi, U.S.

1996-12-31

400

Flow Separation Control for Low-Pressure Turbine Blade using Vortex Generator Jets  

NASA Astrophysics Data System (ADS)

Numerical study of flow separation control is conducted employing Vortex-Generator Jets. This strategy is first tested for the flow past a cylinder at Reynolds number (Re) of 13,400, and then applied to flow in a low-pressure turbine (LPT) cascade for the PAK-B blade geometry at Re = 25,000. A fourth-order accurate compact-difference scheme is used along with sixth-order filtering (C4F6). FDL3DI, a research code developed at WPAFB, is used as the flow solver. A blowing ratio of 2.0 with a skew angle of 90^o and a pitch angle of 30^o is employed in the simulations for the aforementioned configurations. The control jets are pulsed with F^+ = 1.0 for the case of the cylinder, and with F^+ = 2.33 for the LPT case. The results show a significant decrease in drag on the cylinder after the jets are turned on. The total-pressure loss is calculated in the wake region, at x/D = 3.0, and a reduction of 10% is observed. For the LPT case, the implemented flow separation control strategy totally eliminates the separation and leads to 27.5% reduction in wake total-pressure loss.

Kasliwal, Amit

2005-11-01

401

Effect of the turbulence models on Rushton turbine generated flow in a stirred vessel  

NASA Astrophysics Data System (ADS)

In this paper, we performed a comparison of four turbulence models using for numerical simulation of the hydrodynamic structure generated by a Rushton turbine in a cylindrical tank. The finite volume method was employed to solve the Navier-Stokes equations governing the transport of momentum. In this study four closure models tested were: k- ? standard, k- ? RNG, k- ? Realizable and RSM (Reynolds Stress Model). MRF (Multi Reference Frame) technique was used with FLUENT software package. The present work aimed to provide improved predictions of turbulent flow in a stirred vessel and in particular to assess the ability to predict the dissipation rate of turbulent kinetic energy (e) that constitutes a most stringent test of prediction capability due to the small scales at which dissipation takes place. The amplitude of local and overall dissipation rate is shown to be strongly dependent on the choice of turbulence model. The numerical predictions were compared with literature results for comparable configurations and with experimental data obtained using Particle Image Velocimetry (PIV). A very good agreement was found with regards to turbulence.

Chtourou, Wajdi; Ammar, Meriem; Driss, Zied; Abid, Mohamed S.

2011-12-01

402

Turbine power plant with steam and exhaust turbine systems  

Microsoft Academic Search

This patent describes a turbine power plant having a closed loop steam turbine system and a closed loop exhaust turbine system; a closed loop steam turbine system which comprises the combination of: a steam turbine having a fluid inlet and fluid outlet mounted on a shaft; a generator means operatively connected to the shaft; a condenser having a fluid inlet

Papastavros

1988-01-01

403

Theory and economics of by-generation of electricity at city gate stations using a gas expander turbine  

SciTech Connect

The transmission pressure of pipeline gas entering a city-gate station offers an untapped energy source that gas-distribution companies can easily use to produce low-cost electricity. The high-pressure inlet gas can be heated, then isentropically expanded through a turbine that powers a generator and simultaneously reduces the gas pressure and temperature. The gas turboexpander behaves like a pinwheel in the line as the gas flow creates the rotary motion that drives the generator. The pressure and temperature differential that occurs across the inlet and outlet of the device can be held constant, functioning similarly to a standard regulator. The gas exiting the turbine is thus available at entry conditions for the gas-distribution system, while the electricity can be either used onsite or (in the case of a combination utility) fed into the network for electrical baseloading.

Bockert, B.J.

1980-01-01

404

Response measurements for two building structures excited by noise from a large horizontal axis wind turbine generator  

NASA Astrophysics Data System (ADS)

Window and wall acceleration measurements and interior noise measurements ere made for two different building structures during excitation by noise from the WTS-4 horizontal axis wind turbine generator operating in a normal power generation mode. With turbine noise input pulses resulted in acceleration pulses for the wall and window elements of the two tests buildings. Response spectra suggest that natural vibration modes of the structures are excited. Responses of a house trailer were substantially greater than those for a building of sturdier construction. Peak acceleration values correlate well with similar data for houses excited by flyover noise from commercial and military airplanes and helicopters, and sonic booms from supersonic aircraft. Interior noise spectra have peaks at frequencies corresponding to structural vibration modes and room standing waves; and the levels for particular frequencies and locations can be higher than the outside levels.

Hubbard, H. H.; Shepherd, K. P.

1984-11-01

405

Verification of a Flow3d Mathematical Model by a Physical Hydraulic Model of a Turbine Intake Structure of a Small Hydropower Plant and a Practical Use of the Mathematical Model  

NASA Astrophysics Data System (ADS)

The Drava Power Plants Utility company is the owner of all hydropower plants on the Drava River, Slovenia. On the flood waves relief structure of the Zlatoli?je HPP headrace channel the construction of a turbine intake structure for the Melje small hydropower plant is planned. The Melje small HPP shall exploit the biological minimum discharge for electricity production. Since the structure shall be small, the price of a physical hydraulic model research, in comparison with the price of the structure itself, would be too high. Consequently, the client decided to test the designed structure in the cheapest possible way and ordered a 3D mathematical model of the turbine intake structure. By this mathematical model the designed form of the intake structure should be verified, or, in case of non-compliance, a modified form of such structure which would meet the required modes of the SHPP operation should be proposed. Since such a 3D mathematical model hasn't been used for a hydraulic modelling of this type yet, the project performers were slightly mistrustful of the results obtained by it. Regarding our long years' experiences with physical modelling we decided to construct also a physical hydraulic model in order to be able to verify the designed form of the intake structure and then to use the results for the 3D mathematical model calibration. A partial physical hydraulic model was constructed in the Laboratory for Hydraulic Research in Ljubljana in a model scale of 1:20. For construction and implementation of all the necessary research only 30 days were needed. Simultaneously with the physical model all the preparatory arrangements for the geometry of the mathematical model were going on. During the further development of the mathematical model, also some additional researches on the physical model were performed. Considering the time needed to fully establish the functionality of the mathematical model, it showed up to be very time consuming even in comparison to the construction, all necessary adaptations and the research on the physical model. A commercially available computational fluid dynamic (CFD) program, which solves the Reynolds-averaged Navier-Stokes equations, was used to model physical model setup. The mathematical model was applied for the modelling of the zone of the same size as that on the physical model. The measurements of the water flow velocity, which were performed on the physical model, served us for the verification of results, obtained by means of the mathematical model. This paper gives a comparison of physical and mathematical models research results. However, it presents the results of the project form, as well as those of the proposed form, too.

Vosnjak, S.; Mlacnik, J.

2009-04-01

406

Detailed design of a 30kW switched reluctance starter\\/generator system for a gas turbine engine application  

Microsoft Academic Search

A new switched reluctance starter\\/generator (SR S\\/G) system has been developed for an aircraft engine application. The system is rated at 30 kW, 270 Vdc, 52 k r\\/min maximum operating speed. The system also provides 17 hp to start the 1400-hp engine. The system consists of an SR machine directly coupled to the gas turbine engine, an inverter converter unit

Caio A. Ferreira; Stephen R. Jones; William S. Heglund; William D. Jones

1995-01-01

407

Design and finite-element analysis of an outer-rotor permanent-magnet generator for directly coupled wind turbines  

Microsoft Academic Search

This paper presents the design and finite-element analysis of a permanent-magnet generator using neodymium-iron-boron magnets for directly coupled wind turbines. For the sake of small size and light weight with extra low speed for direct coupling, the outer rotor structure is used. The simple magnetic equivalent circuit approach is used for initial design iteration, and the finite-element method is applied

Jianyi Chen; Chemmangot V. Nayar; Longya Xu

2000-01-01

408

Design and FE analysis of an outer-rotor PM generator for directly-coupled wind turbine applications  

Microsoft Academic Search

This paper presents the design and finite element (FE) analysis of a permanent magnet (PM) generator using neodymium-iron-boron magnets for directly-coupled wind turbine applications. To accomplish the goal of small size and light weight with an extra-low speed for direct coupling, the outer rotor structure is applied. The simple magnetic equivalent circuit approach is used for initial design iteration, and

Jian Yi Chen; Chem Nayar; Longya Xu

1998-01-01

409

An integrated OPC based test bench system for multi-MW permanent magnet synchronous generator for wind turbine  

Microsoft Academic Search

An integrated OPC based test system for multi-MW permanent magnet synchronous generator for wind turbine is designed and realized. The Profibus-DP and OPC interface are adopted to be the communication network and the software communication interface for this system, respectively. Three ABB ACS800 converters are involved and served as the power units. The hardware configuration using SIEMENS Profibus-DP master card

Dong Xingjian; Zhuang Shenxian; Yan Wen

2009-01-01

410

Power fluctuations suppression of stand-alone hybrid generation combining solar photovoltaic\\/wind turbine and fuel cell systems  

Microsoft Academic Search

In this paper a hybrid energy system combining variable speed wind turbine, solar photovoltaic and fuel cell generation systems is presented to supply continuous power to residential power applications as stand-alone loads. The wind and photovoltaic systems are used as main energy sources while the fuel cell is used as secondary or back-up energy source. Three individual dc–dc boost converters

Nabil A. Ahmed; Masafumi Miyatake; A. K. Al-Othman

2008-01-01

411

A New Non-gaussian Turbulent Wind Field Generator to Estimate Design-Loads of Wind-Turbines  

Microsoft Academic Search

Climate change and finite fossil fuel resources make it urgent to turn into electricity generation from mostly renewable energies.\\u000a One major part will play wind-energy supplied by wind-turbines of rated power up to 10 MW. For their design and development\\u000a wind field models have to be used. The standard models are based on the empirical spectra, for example by von

A. P. Schaffarczyk; H. Gontier; D. Kleinhans; R. Friedrich

2009-01-01

412

Estimating of a nonlinear power curve for a Wind Turbine Generator  

NASA Astrophysics Data System (ADS)

The output power from a Wind Turbine Generator (WTG) is an intermittent resource, due to the high variability of the atmospheric wind at all spatial or temporal scales ranging from large scale variations to very short variations. Generally, a function transfer or a power curve of WTG is estimated with the IEC standard 61400 - 12 giving a relation of coupling between the measured wind speed and the output power for the considered WTG. However, this relation is a statistical representation and not takes into account the dynamics of the power output, more precisely on small time scales. The goal is to provide a method to estimate and to model the function transfer of a WTG, in order to synthesize the output power mimicking the statistical and the dynamical properties of the real output power. For that, we study the statistics of power curve in the multifractal framework motivated by the presence of spectral scaling for the wind speed and the output power data from a WTG. The first step consists to quantify the power curve or the transfer function of two intermittent stochastic processes such as the wind speed u(t) and the output power p(t) at all temporal scales and at all intensities. In this study, firstly, we define the time increment of the wind speed measurement u'(t) = u(t + ?) - u(t) and the time increment of the output power measurement p'(t) = p(t + ?) - p(t) characterized by mth and nth order structure functions to estimate the exponent functions ?u'(m) and ?p'(n) that characterize respectively the multifractal properties of the wind speed fluctuations u'(t) and the output power fluctuations p'(t) from the WTG. The exponent function ? defines the types of scaling behavior of a process: if ? is linear the statistical behavior is monoscaling corresponding to a monofractal process. If ? is nonlinear and concave, the statistical behavior is multiscaling corresponding to a multifractal process. The concavity of this function is a characteristic of the intermittency, the more the curve is concave, the more the process is intermittent [1,2]. Secondly, we apply a technique given in Seuront & Schmitt 2005 [3], to estimate the power curve of joint fluctuations < u'(t)mp'(t)n > at all scales and at all intensities, by the function Su'p'(m,n): Su'p'(m,n ) = ?u'(m )+ ?p'(n)- r(m,n) (1) where r(n,m) is estimated as the slope of the power law of c(n,m) versus ? in a log-log plot, that is defined as [3]: -- -r(m,n) c(m, n) = < u'm >< p'n > ~ ? (2) the brackets < . > defines the statistical average. The analysis presented in this work, is performed with simultaneous time series of wind speed u(t) and output power p(t) for two types of WTGs, loaded from the Database of Wind Characteristics of the Technical University of Denmark [4]: i) a 300 kW Nordtank wind turbine located in the North Jutland, on the south bank of the Limfjord, about 36 km west of Alborg and 8 km north east of Loegstoer, Denmark. The wind speed and the output power are measured with a sampling rate at 20 Hz during 746 hours. The measurement are obtained at 31 m above the ground. ii) a 2 MW wind turbine at Tjaereborg, Esbjerg, Denmark. The wind speed and the output power are measured with a sampling rate at 25 Hz during 64 hours. The measurement are obtained at 90 m above the ground.

Calif, R.; Schmitt, F. G.

2012-04-01

413

Infrared thermal wave nondestructive testing for rotor blades in wind turbine generators non-destructive evaluation and damage monitoring  

NASA Astrophysics Data System (ADS)

The rotor blades are key components in wind turbine generators. A visual inspection of the laminated shells for delaminations, air pockets, missing/disoriented fabric etc. is in most cases also not possible due to the manufacturing process, so Non-destructive testing and evaluation (NDT & E) techniques for assessing the integrity of rotor blades structure are essential to both reduce manufacturing costs and out of service time of wind turbine generators due to maintenance. Nowadays, Infrared Thermal Wave Nondestructive Testing (Pulsed thermography) is commonly used for assessing composites. This research work utilizes Infrared Thermal Wave Nondestructive Testing system (EchoTherm, Thermal Wave Imaging, Inc.) to inspect a specimen with embedded defects (i.e. foreign matter and air inclusions) in different depth which is a part of rotor blades in wind turbine generators, we have successfully identified defects including foreign matter and air inclusions, and discovered a defective workmanship. The system software allows us to simultaneously view and analyze the results for an entire transition.

Zhao, Shi Bin; Zhang, Cun-Lin; Wu, Nai-Ming; Duan, Yu-Xia; Li, Hao

2009-07-01

414

Advanced natural gas-fired turbine system utilizing thermochemical recuperation and/or partial oxidation for electricity generation, greenfield and repowering applications.  

National Technical Information Service (NTIS)

The performance, economics and technical feasibility of heavy duty combustion turbine power systems incorporating two advanced power generation schemes have been estimated to assess the potential merits of these advanced technologies. The advanced technol...

1997-01-01

415

Generation of useful energy from process fluids using the biphase turbine  

NASA Astrophysics Data System (ADS)

The six largest energy consuming industries in the United States were surveyed to determine the energy savings that could result from applying the Biphase turbine to industrial process streams. A national potential energy savings of 58 million barrels of oil per year (technical market) was identified. This energy is recoverable from flashing gas liquid process streams and is separate and distinct from exhaust gas waste heat recovery. The industries surveyed in this program were the petroleum chemical, primary metals, paper and pulp, stone-clay-glass, and food. It was required to determine the applicability of the Biphase turbine to flashing operations connected with process streams, to determine the energy changes associated with these flashes if carried out in a Biphase turbine, and to determine the suitability (technical and economical feasibility) of applying the Biphase turbine to these processes.

Helgeson, N. L.

1981-01-01

416

Investigation of the levels of electromagnetic radiation generated by wind turbines.  

National Technical Information Service (NTIS)

The issue of electromagnetic interference is arising with some regularity as various wind energy projects throughout the UK reach the stage where local authority planning approval is sought. To many of the parties involved, wind turbines represent an unkn...

C. A. Morgan

1992-01-01

417

Conclusions from a Research Program on Mixed Flow Gas Generator Turbines.  

National Technical Information Service (NTIS)

Variations of efficiency with pressure ratio and rotor design were studied. The base prototype is a 600 hp turboprop single stage aircraft engine. Rotating rig testing shows that a mixed flow turbine is capable of surpassing the aerodynamic efficiency of ...

U. Okapuu

1987-01-01

418

Thermal-hydraulic response and iodine transport during a steam generator tube rupture  

SciTech Connect

Recent reanalyses of the offsite dose consequences following a steam generator tube rupture have identified a possible non-conservatism in original FSAR analyses. Post-trip uncovery of the top of the steam generator U-tubes, in conjunction with a break near the U-tube top, could lead to increased iodine release due to a reduced ''scrubbing'' of the iodine in the primary break fluid by the steam generator secondary liquid. To evaluate this issue, analyses were performed at the Idaho National Engineering Laboratory. The RELAP5 computer code was used to conduct an analysis of the Surry plant to determine whether the post-trip steam generator secondary mixture level was sufficient to maintain continuous coverage of the U-tubes. The results indicated continuous coverage of the U-tubes. The RELAP5 result was supported by a hand calculation. Additional RELAP5 analyses were conducted to determine magnitudes of iodine release for a steam generator tube rupture. Two sensitivity studies were conducted. The amount of iodine released to the atmosphere was strongly dependent on the assumed value of the partition coefficient. The assumption of steam generator U-tube uncovery, on a collapsed liquid level basis, following reactor trip had a minor effect on the amount of released iodine. 17 refs., 28 figs., 5 tabs.

Callow, R.A.

1988-10-01

419

A medium frequency transformer with multiple secondary windings for medium voltage converter based wind turbine power generating systems  

NASA Astrophysics Data System (ADS)

Recent advances in magnetic materials have led to the development of compact and light weight, medium and high frequency transformers, which would be a possible solution to reducing the size and weight of wind turbine power generating systems. This paper presents the overall design and analysis of a Metglas amorphous alloy 2605SA1 based medium frequency transformer to generate the isolated balanced multiple DC supplies for medium voltage converter systems. A comprehensive electromagnetic analysis is conducted on the proposed design based on experimental results. The test stand, data analysis, and test results are discussed.

Islam, Md Rabiul; Guo, Youguang; Zhu, Jianguo

2013-05-01

420

Investigation of the feasibility of a biphase turbine for industrial process energy recovery. Final report  

SciTech Connect

Tests were conducted to assess the technical applicability of the Biphase turbine to two process streams. A Biphase impulse turbine was tested on a flashing Selexol stream used for removal of CO/sub 2/ from process gases. The experimental results showed that the two-phase nozzle performance of the flashing Selexol stream was substantially below equilibrium calculation predictions. Consequently, the turbine power generated by this expanding two-phase flow was below predicted values, and was approximately equivalent to the liquid hydraulic power available. Additional gas-liquid phase separation occurred on the rotor such that overall separation efficiency reached 98% of that which occurred in the long residence time settling tank (equilibrium). The Biphase reaction turbine was tested on a flashing natural gas/crude oil stream. Nozzle, rotary and overall turbine performance were in good agreement with pre-test predictions for power generation and efficiency of operation. 141 figs., 35 tabs.

Helgeson, N.

1985-06-28

421

Wind turbine blade pitch control system  

Microsoft Academic Search

A pitch control system for a multibladed variable pitch wind turbine is described. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under

P. E. Barnes; M. G. Mayo; R. Sherman

1982-01-01

422

Generation of underwater sound pulses, cavitation and shear waves with hydraulic hammer  

NASA Astrophysics Data System (ADS)

A hydrodynamic acoustic generator with shear waves source for seismic sea bottom profiling was developed. The principle of inversed water hammer is applied for the production of high energy pressure pulses. The mechanism of acoustic cavitation in water hammer is detailed. Homogeneous mixing of gas bubbles and fluid is numericaly modeled. Bubble dynamics is described by relations between bubble radius, pressure, nucleation, amplitude of expansion waves, and relaxation effects. A shear wave generator using inversed water hammer effects and sea water as working medium is described.

Meier, G. E. A.; Laake, A.; Rein, M.

1988-04-01

423

Wind Power predictability a risk factor in the design, construction and operation of Wind Generation Turbines  

NASA Astrophysics Data System (ADS)

Summit: The wind power predictability is often a forgotten decision and planning factor for most major wind parks, both onshore and offshore. The results of the predictability are presented after having examined a number of European offshore and offshore parks power predictability by using three(3) mesoscale model IRIE_GFS and IRIE_EC and WRF. Full description: It is well known that the potential wind production is changing with latitude and complexity in terrain, but how big are the changes in the predictability and the economic impacts on a project? The concept of meteorological predictability has hitherto to some degree been neglected as a risk factor in the design, construction and operation of wind power plants. Wind power plants are generally built in places where the wind resources are high, but these are often also sites where the predictability of the wind and other weather parameters is comparatively low. This presentation addresses the question of whether higher predictability can outweigh lower average wind speeds with regard to the overall economy of a wind power project. Low predictability also tends to reduce the value of the energy produced. If it is difficult to forecast the wind on a site, it will also be difficult to predict the power production. This, in turn, leads to increased balance costs and a less reduced carbon emission from the renewable source. By investigating the output from three(3) mesoscale models IRIE and WRF, using ECMWF and GFS as boundary data over a forecasting period of 3 months for 25 offshore and onshore wind parks in Europe, the predictability are mapped. Three operational mesoscale models with two different boundary data have been chosen in order to eliminate the uncertainty with one mesoscale model. All mesoscale models are running in a 10 km horizontal resolution. The model output are converted into "day a head" wind turbine generation forecasts by using a well proven advanced physical wind power model. The power models are using a number of weather parameters like wind speed in different heights, friction velocity and DTHV. The 25 wind sites are scattered around in Europe and contains 4 offshore parks and 21 onshore parks in various terrain complexity. The "day a head" forecasts are compared with production data and predictability for the period February 2010-April 2010 are given in Mean Absolute Errors (MAE) and Root Mean Squared Errors (RMSE). The power predictability results are mapped for each turbine giving a clear picture of the predictability in Europe. . Finally a economic analysis are shown for each wind parks in different regimes of predictability will be compared with regard to the balance costs that result from errors in the wind power prediction. Analysis shows that it may very well be profitable to place wind parks in regions of lower, but more predictable wind ressource. Authors: Ivan Ristic, CTO Weather2Umberlla D.O.O Tomislav Maric, Meteorologist at Global Flow Solutions Vestas Wind Technology R&D Line Gulstad, Manager Global Flow Solutions Vestas Wind Technology R&D Jesper Thiesen, CEO ConWx ApS

Thiesen, J.; Gulstad, L.; Ristic, I.; Maric, T.

2010-09-01

424

Control of the variable speed generator on the Sandia 34-metre vertical axis wind turbine  

NASA Astrophysics Data System (ADS)

The DOE/Sandia 34-meter VAWT Test Bed is a 500kW variable-speed wind turbine. The turbine is operated between 25 and 38 rpm and has been characterized from a structural and aerodynamic standpoint. A preliminary variable speed control algorithm has been implemented on the Test Bed. This paper describes the initial variable-speed control algorithm developed for the Test Bed and the performance of that algorithm to date. Initial performance comparisons between variable-speed and fixed-speed operation are made as well as some thoughts on the expansion of the operating envelope of the Test Bed.

Ralph, Mark E.

425

Control of the variable speed generator on the Sandia 34-metre vertical axis wind turbine  

SciTech Connect

The DOE/Sandia 34-metre VAWT Test Bed is a 500kW variable-speed wind turbine. The turbine is operated between 25 and 38 rpm and has been characterized from a structural and aerodynamic stand point. A preliminary variable speed control algorithm has been implemented on the Test Bed. This paper describes the initial variable-speed control algorithm developed for the Test Bed and the performance of that algorithm to date. Initial performance comparisons between variable-speed and fixed-speed operation are made as well as some thoughts on the expansion of the operating envelope of the Test Bed. 7 refs., 4 figs.

Ralph, M.E.

1989-01-01

426

Special Electro-Hydraulic Valve for Hydro-Viscous Drive Used in Thermal Power Generation Plant  

Microsoft Academic Search

When applied on the pulverized coal blowers or water-feeding pumps which are driven by huge electrical motors in one thermal power generation plant, acting as a kind of the soft start-up device, hydro-viscous drive (HVD) can help to save a lot of energy. The principle and structure of HVD is introduced in the paper. Through theoretical analysis of the HVD

Ning Chen

2009-01-01

427

Activities carried out at the NPO TsKTI on ensuring the Strength and Service Life of Power-Generating Equipment  

NASA Astrophysics Data System (ADS)

We describe the main activities carried out at the Central Boiler-Turbine Institute Research and Production Association Department for Strength and Service Life of Power-Generating Equipment on solving comprehensive problems of ensuring the strength and durability of steam, gas, and hydraulic turbines; boilers, and steam lines, as well as auxiliary equipment of thermal and nuclear power stations.

Sudakov, A. V.; Gavrilov, S. N.; Danyushevskii, I. A.; Levchenko, A. I.; Nefed'Ev, E. Yu.; Smelkov, L. L.; Soldatov, A. S.

2008-01-01

428

Control system design for the MOD-5A 7.3 mW wind turbine generator  

NASA Astrophysics Data System (ADS)

This paper provides descriptions of the requirements analysis, hardware development and software development phases of the Control System design for the MOD-5A 7.3 mW Wind Turbine Generator. The system, designed by General Electric Company, Advanced Energy Programs Department, under contract DEN 3-153 with NASA Lewis Research Center and DOE, provides real time regulation of rotor speed by control of both generator torque and rotor torque. A variable speed generator system is used to provide both airgap torque control and reactive power control. The wind rotor is designed with segmented ailerons which are positioned to control blade torque. The central component of the control system, selected early in the design process, is a programmable controller used for sequencing, alarm monitoring, communication, and real time control. Development of requirements for use of aileron controlled blades and a variable speed generator required an analytical simulation that combined drivetrain, tower and blade elastic modes with wind disturbances and control behavior. An orderly two phase plan was used for controller software development. A microcomputer based turbine simulator was used to facilitate hardware and software integration and test.

Barton, Robert S.; Hosp, Theodore J.; Schanzenbach, George P.

1995-05-01

429

Current and Novel Electrical Generator Technology for Wave Energy Converters  

Microsoft Academic Search

Wave energy is currently an untapped resource, but has the potential to make a significant contribution to the energy mix. In order to use conventional electrical generators mechanical interfaces are used, such as hydraulic systems and air-turbines. With the electrical generator these interfaces are known as the electrical power take-off and the type used depends upon the wave energy device.

M. A. Mueller; Henk Polinder; Nick Baker

2007-01-01

430

Development of vertical axial wind turbine driven by three hastate windmill and permanent magnet generator  

Microsoft Academic Search

Wind energy is a clear, safe and renewable green energy resource. Because it can be supplied inexhaustibly and always be used availably, it is exploited by countries all over the world and has gradually become a new energy type. According to the wind energy characteristics and the hydrodynamics theory, the vertical axial wind turbine of three hastate windmill, which can

Lei Song; ZongXiao Yang; ShuQi Hou; RuiTao Deng; ShuLing Ji

2010-01-01

431

MOD-OA 200 kW wind turbine generator engineering  

NASA Astrophysics Data System (ADS)

Engineering drawings and the detailed mechanical and electrical design of a horizontal-axis wind turbine designed for DOE at the NASA Lewis Research Center and installed in Clayton, New Mexico are discussed. The drawings show the hub, pitch change mechanism, drive train, nacelle equipment, yaw drive system, tower, foundation, electrical power systems, and the control and safety systems.

Andersen, T. S.; Bodenschatz, C. A.; Eggers, A. G.; Hughes, P. S.; Lampe, R. F.

1980-08-01

432

Impact study on the use of biomass-derived fuels in gas turbines for power generation  

SciTech Connect

This report evaluates the properties of fuels derived from biomass, both gaseous and liquid, against the fuel requirements of gas turbine systems for gernating electrical power. The report attempts to be quantitative rather than merely qualitative to establish the significant variations in the properties of biomass fuels from those of conventional fuels. Three general categories are covered: performance, durability, and storage and handling.

Moses, C.A.; Bernstein, H. [Southwest Research Inst., San Antonio, TX (United States)

1994-01-01

433

Highlights from a Research Program on a Very Highly Loaded Axial Gas Generator Turbine.  

National Technical Information Service (NTIS)

The highlights from an aerodynamic rig test program on a small axial turbine having unusually low blade speed are presented. It is shown that certain benefits are derived from reduced speed. Measured pressures on vane surfaces appear to agree well with an...

U. Okapuu

1987-01-01

434

Automatic generation control of a wind farm with variable speed wind turbines  

Microsoft Academic Search

Wind farms are considered to be negative loads from the point of view of a utility manager. Modern variable-speed wind turbines offer the possibility for controlling active and reactive power separately. This paper presents a new integrated control system of a wind farm according to the utility manager's requirements. This control system is based on two control levels: a supervisory

José Luis Rodríguez-Amenedo; Santiago Arnalte; Juan Carlos Burgos

2002-01-01

435

Bioelectricity generation in continuously-fed microbial fuel cell: Effects of anode electrode material and hydraulic retention time.  

PubMed

The main aim of this study is to investigate the bioelectricity production in continuously-fed dual chambered microbial fuel cell (MFC). Initially, MFC was operated with different anode electrode material at constant hydraulic retention time (HRT) of 2d to evaluate the effect of electrode material on electricity production. Pt electrode yielded about 642mW/m(2) power density, which was 4 times higher than that of the MFC with the mixed metal oxide titanium (Ti-TiO2). Further, MFC equipped with Pt electrode was operated at varying HRT (2-0.5d). The power density generation increased with decreasing HRT, corresponding to 1313mW/m(2) which was maximum value obtained during this study. Additionally, decreasing HRT from 2 to 0.5d resulted in increasing effluent dissolved organic carbon (DOC) concentration from 1.92g/L to 2.23g/L, corresponding to DOC removal efficiencies of 46% and 38%, respectively. PMID:24140850

Akman, Dilek; Cirik, Kevser; Ozdemir, Sebnem; Ozkaya, Bestamin; Cinar, Ozer

2013-10-04

436

Turbine-generator design, analysis, and testing for prevention of double-frequency torsional resonance  

SciTech Connect

Prior to the mid-1970's, there existed little or no industry experience which would allow a meaningful assessment of the relationship between power system disturbances and their effects on turbine blade stresses. At the time, the most sophisticated rotor torsional analytical tools involved a lumped mass representation which typically was only applicable for predicting stresses in shafts and couplings for subsynchronous (less than 60 Hz) torsional vibrations. When incidents of lower pressure (LP) turbine blade distress due to double-frequency (120 Hz) torsional resonance were successfully diagnosed and corrected, the need for enhanced analytical and experimental methods was apparent. This paper describes various analytical and experimental developments in the area of coupled rotor/blade torsional response. It also describes ongoing efforts and developments in the analysis, detection and prevention of double-frequency torsional resonance.

Hurley, J.D.; Welhoelter, S.A. (Westinghouse Electric Corp., Power Generation Operations Div., Orlando, FL (US))

1989-01-01

437

Economics of geothermal electricity generation from hydrothermal resources using the Biphase rotary-separator turbine  

Microsoft Academic Search

Geothermal power systems using a Biphase rotary-separator turbine (RST) are compared to flash steam and binary systems. Application to geothermal fluids having temperatures from 280 to 680°F is considered. Brine production costs, capital equipment costs, and competing system efficiencies were taken from published studies. RST performance was extrapolated from field-test results. Systems incorporating the Biphase RST are projected to produce

D. H. Klipstein; R. S. Atkins

1981-01-01

438

FLOW GENERATED BY PITCHED BLADE TURBINES I: MEASUREMENTS USING LASER DOPPLER ANEMOMETER  

Microsoft Academic Search

Mean flow and turbulence intensities have been measured using laser Doppler anemometer for pitched blade downflow turbines (PTD). Fully baffled, flat bottomed cylindrical vessels of 300 and 500 mm internal diameter were employed. The effect of impeller clearance on flow characteristics have been investigated. The influence of geometry of PTD, that is blade angle (30-60°), blade width (0.2D-0.4D) and impeller diameter

V. V. RANADE; J. B. JOSHI

1989-01-01

439

Optimal Cycle Scheme of Direct Cycle Supercritical CO2 Gas Turbine for Nuclear Power Generation Systems  

NASA Astrophysics Data System (ADS)

A supercritical CO2 turbine cycle can achieve a considerably high cycle thermal efficiency at medium turbine inlet temperatures of 500-650°C at high pressure such as 20 MPa, which is too high to produce a reactor pressure vessel within the existing fabrication limits. To solve this problem, a dual expansion turbine cycle is effective; its application was examined for both the fast reactor (FR) of 527°C and 12.5 MPa and a high-temperature gas-cooled reactor (HTGR) of 650°C and 8 MPa. Results showed that, in the case of FR, the cycle thermal efficiency became 42.6%, 44.0%, and 45.1%, respectively, for the 12.5 MPa cycle, the dual expansion cycle, and the 20 MPa cycle. Therefore, the dual expansion cycle is effective. On the other hand, for HTGR, the cycle thermal efficiency became 47.5%, 48.5%, and 50.3%, respectively, for the 8 MPa cycle, the dual expansion cycle, and 20 MPa cycle. In this case, the cycle efficiency advantage becomes smaller than that for the FR, but a 1.0% advantage is obtainable.

Muto, Yasushi; Kato, Yasuyoshi

440

Performance comparison of three — and five-phase permanent magnet generators for marine current turbine applications under open-circuit faults  

Microsoft Academic Search

Multiphase generators seems to be an interesting solution for variable-speed drive applications and particularly attractive for renewable energy generation. In this context, the performance of a five-phase permanent magnet synchronous generator are evaluated within a marine current turbine and compared to a classical three-phase generator. For both topologies, a robust nonlinear control strategy, namely high- order sliding mode control, is

Seifeddine Benelghali; Fatiha Mekri; Mohamed Benbouzid; Jean Frederic Charpentier

2011-01-01

441

Shaken, not stirred: The recipe for a fish-friendly turbine  

SciTech Connect

It is generally agreed that injuries and mortalities among turbine-passed fish can result from several mechanisms, including rapid and extreme water pressure changes, cavitation, shear, turbulence, and mechanical injuries (strike and grinding). Advances in the instrumentation available for monitoring hydraulic conditions and Computational Fluid Dynamics (CFD) techniques now make it possible both to estimate accurately the levels of these potential injury mechanisms in operating turbines and to predict the levels in new turbine designs. This knowledge can be used to {open_quotes}design-out{close_quotes} the most significant injury mechanisms in the next generation of turbines. However, further improvements in turbine design are limited by a poor understanding of the levels of mechanical and hydraulic stresses that can be tolerated by turbine-passed fish. The turbine designers need numbers (biological criteria) that define a safety zone for fish within which pressures, shear forces, cavitation, and chance of mechanical strike are all at acceptable levels for survival. This paper presents the results of a literature review of fish responses to the types of biological stresses associated with turbine passage, as studied separately under controlled conditions in the laboratory rather than in combination at field sites. Some of the controlled laboratory and field studies reviewed here were bioassays carried out for reasons unrelated to hydropower production. Analysis of this literature was used to develop provisional biological criteria for hydroelectric turbine designers. These biological criteria have been utilized in the U.S. Department of Energy`s Advanced Hydropower Turbine System (AHTS) Program to evaluate the results of conceptual engineering designs and the potential value of future turbine models and prototypes.

Cada, G.F.

1997-03-01

442

CFD investigating thermal-hydraulic characteristics and hydrogen generation from graphite–water reaction after SG tube rupture in HTR-10 reactor  

Microsoft Academic Search

With inherent safety performance and high conversion efficiency, high-temperature gas-cooled reactors are the possible candidates for next-generation energy sources. A transient three-dimensional compressible CFD model is developed to investigate the thermal-hydraulic characteristics within the core under steady-state and accident conditions. The HTR-10, a graphite-moderated and helium-cooled reactor with a pebble bed core is selected for the present simulations. Four postulated

Y. M. Ferng; C. T. Chen

2011-01-01

443

A Study of Transient Magnetic Fields in a Nacelle of a Wind Turbine Generator System due to Lightning  

NASA Astrophysics Data System (ADS)

A wind turbine generator system is composed of blades, a nacelle, a tower etc. In recent year, to make the blades and the nacelle lighter, the blades are often made from GFRP (Glass Fiber Reinforced Plastics) and the nacelle is composed of steel grids and GFRP covering it. When the lightning strikes the wind turbine, the current flows into the ground through the down conductor in the blades, the steel grids of nacelle, and the tower. The current flowing near the nacelle produces comparatively large magnetic fields inside the nacelle. Therefore, the communication and control systems are broken down or malfunction. In this paper, the transient magnetic fields in a nacelle due to lightning strokes at the tip of the blade and the rear portion of the nacelle are studied analytically and experimentally. In the analytical studies, the FDTD (Finite Difference Time Domain) method which is one of numerical electromagnetic field analyses is used. The reduced-size model of a wind turbine is used for experimental studies. As the results of the researches, it has been found that the magnetic fields at the front of the nacelle are larger than those at the rear of the nacelle regardless of the injected points of the lightning current. The lightning current following through the down conductor connected to the nacelle through the blades has a strong influence on the magnetic fields in the nacelle. We have proposed that the front of the nacelle should be covered with the conductor plate or mesh to decrease the large magnetic fields.

Yamamoto, Kazuo; Chikara, Tomohiro; Ametani, Akihiro

444

Fuzzy Control Systems Dedicated to Electro-Hydraulic Servo-Systems. IFT Techniques and Sensitivity Analysis  

Microsoft Academic Search

The paper proposes fuzzy control systems meant for controlling the electro-hydraulic servo-systems considered as actuators as part of speed control systems in hydro-turbine generators. In this situation the controlled plants are characterized by simplified mathematical models of second-order and third-order integral type. The development is done by using the linear case results on the basis of the Extended Symmetrical Optimum

Radu-Emil Precup; Stefan Preitl; Stefan Kilyeni; Zsuzsa Preitl; Constantin Barbulescu

2007-01-01

445

Investigation of self-excited induction generators for wind turbine applications  

Microsoft Academic Search

The use of squirrel-cage induction machines in wind generation is widely accepted as a generator of choice. The squirrel-cage induction machine is simple, reliable, cheap, lightweight, and requires very little maintenance. Generally, the induction generator is connected to the utility at constant frequency. With a constant frequency operation, the induction generator operates at practically constant speed (small range of slip).

E. Muljadi; C. P. Butterfield; J. Sallan; M. Sanz

2000-01-01

446

Investigation of a Low-Cost Grid-Connected Inverter for Small-Scale Wind Turbines Based on a Constant-Current Source PM Generator  

Microsoft Academic Search

This paper describes a novel low-cost grid-connected inverter for small-scale wind turbines based on a high-inductance PM generator operating in a constant-current output mode. The PM generator is connected to a switched-mode rectifier (SMR) which consists of an uncontrolled rectifier and a switch. The combination of the high-inductance generator and uncontrolled rectifier produces a constant DC current. The switch is

David M. Whaley; Gurhan Ertasgin; Wen L. Soong; Nesimi Ertugrul; James Darbyshire; H. Dehboeni; Chem V. Nayar

2006-01-01

447

The analysis and specification of large high-pressure, high-temperature valves for combustion turbine protection in second-generation PFB power plants: Topical report  

SciTech Connect

The purpose of this study was to provide a specification for the high-pressure/high-temperature valves for turbine overspeed protection in a commercial-scale second-generation pressurized fluidized bed combustion (PFBC) power plant. In the event of a loss of external (generator) load, the gas turbine rapidly accelerates from its normal operating speed. Protection from excessive overspeed can be maintained by actuation of fuel isolation and air bypass valves. A design specification for these valves was developed by analyses of the turbine/compressor interaction during a loss of load and analyses of pressure and flow transients during operation of the overspeed protection valves. The basis for these analyses was the Phase 1 plant conceptual design prepared in 1987.

Not Available

1994-08-01

448

Advanced natural gas-fired turbine system utilizing thermochemical recuperation and/or partial oxidation for electricity generation, greenfield and repowering applications  

SciTech Connect

The performance, economics and technical feasibility of heavy duty combustion turbine power systems incorporating two advanced power generation schemes have been estimated to assess the potential merits of these advanced technologies. The advanced technologies considered were: Thermochemical Recuperation (TCR), and Partial Oxidation (PO). The performance and economics of these advanced cycles are compared to conventional combustion turbine Simple-Cycles and Combined-Cycles. The objectives of the Westinghouse evaluation were to: (1) simulate TCR and PO power plant cycles, (2) evaluate TCR and PO cycle options and assess their performance potential and cost potential compared to conventional technologies, (3) identify the required modifications to the combustion turbine and the conventional power cycle components to utilize the TCR and PO technologies, (4) assess the technical feasibility of the TCR and PO cycles, (5) identify what development activities are required to bring the TCR and PO technologies to commercial readiness. Both advanced technologies involve the preprocessing of the turbine fuel to generate a low-thermal-value fuel gas, and neither technology requires advances in basic turbine technologies (e.g., combustion, airfoil materials, airfoil cooling). In TCR, the turbine fuel is reformed to a hydrogen-rich fuel gas by catalytic contact with steam, or with flue gas (steam and carbon dioxide), and the turbine exhaust gas provides the indirect energy required to conduct the endothermic reforming reactions. This reforming process improves the recuperative energy recovery of the cycle, and the delivery of the low-thermal-value fuel gas to the combustors potentially reduces the NO{sub x} emission and increases the combustor stability.

NONE

1997-03-01

449

An ElectroHydraulic Actuated Ankle Foot Orthosis to Generate Force Fields and to Test Proprioceptive Reflexes During Human Walking  

Microsoft Academic Search

The control of human walking can be temporarily modified by applying forces to the leg. To study the neural mechanisms underlying this adaptive capacity, a device delivering controlled forces and high-velocity displacements to the ankle was designed. A new solution, involving a closed circuit hydraulic system composed of two cylinders (master-slave) mutually connected by hoses and controlled by an electric

Martin Noël; Benoit Cantin; Sébastien Lambert; Clément M. Gosselin; Laurent J. Bouyer

2008-01-01

450

A low speed, high-torque, direct-drive permanent magnet generator for wind turbines  

Microsoft Academic Search

There is a market for small, efficient and cost-effective wind generators for mini-grid and remote power systems. Direct-drive permanent magnet generators have become very attractive for this application. This paper describes the improvements achieved in an outer-rotor direct-drive permanent magnet generator by using finite element analysis and optimisation techniques. The starting torque of the generator is studied. An optimisation routine

W. Wu; V. S. Ramsden; T. Crawford; G. Hill

2000-01-01

451

DESIGN, FABRICATION, AND TESTING OF AN ADVANCED, NONPOLLUTING TURBINE DRIVE GAS GENERATOR  

Microsoft Academic Search

The objectives of this report period were to continue and complete testing of the Gas Generator hardware, to complete and submit a Draft Final Report, and after incorporation of adjustments required, to then submit the Final Report. Focus during this report period was initially on testing the Gas Generator. While conducting scheduled full power tests of the Gas Generator at

Stephen E. Doyle

2002-01-01

452

A Study on the Observation of Direct Lightning Current through the Wind Turbine Generator System in the Coast of the Japan Sea  

NASA Astrophysics Data System (ADS)

As clean energy that solves energy resources, many wind turbine generator systems have developed up to now, in Japan. The generation capacity of wind power is above 1 million kW, and the construction also continues from now on. The wind turbine generator systems are built in the good place of the wind condition, and those many are built on the coast of the Japan Sea. However, the coast of the Japan Sea is known as a place with much winter lightning, and wind turbine generator systems also often suffer the damage by winter lightning. The authors observed the lightning current that strikes through the wind turbine generator systems directly, in order to establish on the lightning protection of them. The authors acquired dozens of data as a result of observation in Akita Japan for 17 months. Based on these data, some considerations were performed about the performance of winter lightning that struck through the wind turbine generator systems. As the result of consideration, we found some interesting knowledge following sentence. It made clear anew that the tower which is a place of high position from the ground and on the windward has much number of lightning flash and many total flash charges. The lightning stroke current divided the tower pipe and ground leads. About 70% of the observed lightning current flowed to the tower pipe, and about 30% is divided into two grounding leads connected to the leg of tower. All of steep current that is on a wave front flow a tower side, it dose not flow to a grounding leads side. The distributions of lightning parameters between our observation results and past one are in good conformity.

Shiraishi, Yasuhiro; Otsuka, Takahiro; Matsuura, Hideki

453

Technical and economic analysis for the integration of small reverse osmosis desalination plants into MAST gas turbine cycles for power generation  

Microsoft Academic Search

A technical and economic analysis concerning the integration of small reverse osmosis (RO) desalination plants into mixed air steam turbine (MAST) technologies for power generation was carried out. The simulation tool used is the computer aid reverse osmosis calculations optimization algorithm. This user-friendly software takes into account the capital cost, fuel cost and operation and maintenance requirements of each candidate

Andreas Poullikkas

2005-01-01

454

Proceedings of the 1998 international joint power generation conference (FACT-Vol.22). Volume 1: Fuels and combustion technologies; Gas turbines; Environmental engineering; Nuclear engineering  

Microsoft Academic Search

Papers are arranged under the following topical sections: Fuels and combustion technologies; Low NOx burner applications; Low cost solutions to utility NOx compliance issues; Coal combustion--Retrofit experiences, low NOx, and efficiency; Highly preheated air combustion; Combustion control and optimization; Advanced technology for gas fuel combustion; Spray combustion and mixing; Efficient power generation using gas turbines; Safety issues in power industry;

A. Gupta; R. Natole; A. Sanyal; J. Veilleux

1998-01-01

455

DYNAMIC BEHAVIOUR OF TWO STATOR FLUX CONTROL SYSTEMS OF A DOUBLY FED INDUCTION GENERATOR BASED GRID-CONNECTED WIND TURBINE DURING VOLTAGE DIPS  

Microsoft Academic Search

In order to investigate the dynamic behaviour of a wind turbine with Doubly Fed Induction Generator (DFIG) connected to the network during grid disturbance, this paper presents an equivalent continuous model. This model includes mechanical, electrical parts and the connection system to a distribution network. A comparison of two different DFIG control strategies during network faults is shown with the

S. EL AIMANI; B. FRANÇOIS; B. ROBYNS; E. DE JAEGER

2005-01-01

456

Small signal stability analysis and control of the wind turbine with the direct-drive permanent magnet generator integrated to the grid  

Microsoft Academic Search

In this paper, a model of the wind turbine (WT) with direct-drive permanent magnet generator (DDPMG) and its associated controllers is presented, based on which a small signal stability analysis model is derived. The small signal stability analysis shows that the WT with DDPMG without the controllers is stable, and the controller can improve the small signal stability of the

F. Wu; Xiao-Ping Zhang; P. Ju

2009-01-01

457

The method for reducing starting resistant moment by suitable top rake of magnetic pole in Permanent Magnet Generator driven by wind turbine  

Microsoft Academic Search

The 2-D transient field model of Interior permanent magnet generator (IPMG) which is driven by wind turbine is set up and analyzed by the software of Ansoft. As a result, with the size of top rake of magnetic pole changing, the variation of starting resistant moment is obtained. Consequently, theoretic reference for minimization of starting resistant moment of IPMG is

Zhongliang An; Wanzhen Liu; Yan Li; Zhihuan Song; Renyuan Tang

2008-01-01

458

Engineering Design Test Report of the 100-kw, 400-Cycle, Gas-Turbine-Engine-Driven Generator Set Solar Model T-350m-5.  

National Technical Information Service (NTIS)

The report covers the engineering design testing and the evaluation of a 100-kw, 400-cycle, gas-turbine-engine-driven generator set for use in the AN/MPQ-32 Radar System, and as a member of the Army's family of multipurpose prime power packages. The repor...

T. D. Cooper H. L. Clark

1966-01-01

459

The Performance Analysis of Ultra High Speed PM Type Synchronous Motor-Generator for Micro Turbine  

NASA Astrophysics Data System (ADS)

This paper deals with loss analysis, structural, thermal-fluid and rotordynamics (critical speed and unbalance) which need in developing the motor-generator. This machine has designed of a generator of 800 W, 400 krpm and a starter of 400 W, 200 krpm. The generated losses of motor-generator are derived by magnetic analysis. Thermal-fluid analysis is performed using loss analysis result. The critical speed is extracted by Campbell diagram. Unbalance vibration response analysis enable to predict the expected vibration amplitude by unbalance. The motor-generator is well-developed using the applied several techniques of analysis.

Hong, Do-Kwan; Woo, Byung-Chul; Jeong, Yeon-Ho; Koo, Dae-Hyun; Cho, Yun-Hyun

460

Turbine rotor for gas turbine engine  

SciTech Connect

This patent describes a gas turbine engine having a casing defining an axis of the engine, a rotor for disposition between a pair of anti-friction bearings disposed on the casing and aligned on the axis comprising, and a turbine wheel disposed between the bearings in a plane perpendicular to the axis and including a centerbore therethrough. The engine includes a main shaft aligned on the axis projecting through the centerbore with a turbine end on one side of the turbine wheel and an output end on the other side thereof, and means defining reversed flange on the main shaft turbine end radially outboard of the main shaft, means connecting the reversed flange to the turbine wheel for torque transfer to the main shaft. One of the bearings engages the reversed flange for rotatably supporting a turbine end of the rotor on the engine casing. The engine has a tubular reference shaft around the main shaft projecting through the centerbore with a turbine end of the reference shaft disposed between the reversed flange and the main shaft and with an output end of the reference shaft rigidly connected to the main shaft output end. A journal bearing means is located between an outer surface of the reference shaft and an inner surface of the reversed flange whereby the reference shaft turbine end and the reversed flange are freely relatively rotatable but unitized to resist beam bending of the rotor. The other of the bearings engages the reference shaft generally at the output end thereof whereby an output end of the rotor is rotatably supported on the engine casing. A transducer means is located between the turbine end of the main shaft and the turbine end of the reference shaft operative to generate a signal proportional to the relative angular positions of the main shaft turbine end and the reference shaft turbine end.

Beam, P.E. Jr.

1986-11-18

461

Second-Generation Pressurized Fluidized Bed Combustion: Small gas turbine industrial plant study  

Microsoft Academic Search

Second-Generation Pressurized Fluidized Bed Combustion (PFBC) plants provide a coal-fired, high-efficiency, combined-cycle system for the generation of electricity and steam. The plants use lime-based sorbents in PFB combustors to meet environmental air standards without back-end gas desulfurization equipment. The second-generation system is an improvement over earlier PFBC concepts because it can achieve gas temperatures of 2100°F and higher for improved

J. Shenker; R. Garland; D. Horazak; F. Seifert; R. Wenglarz

1992-01-01

462

Economic Analysis of the Environmental Effects of a Combustion-Turbine Generating Station at Frederickson Industrial Park, Pierce County, Washington : Final Report.  

SciTech Connect

This report presents a case study of a combustion-turbine generator, fired primarily by natural gas. The study estimates the economic value of the environmental costs and benefits of this electricity-generating resource. The four major categories of impacts are air pollution, noise, accidents, and boomtown effects. A detailed economic analysis of these effects was conducted as they pertained to each element of the fuel cycle: fuel extraction, fuel transportation, plant construction and decommissioning, and plant operation. 87 references. (ACR)

ECO Northwest, Ltd.; Seton, Johnson & Odell, Inc.; Shapiro and Associates, Inc.

1984-03-26

463

Steady state modeling of doubly fed induction generators for mega watt class wind turbines  

Microsoft Academic Search

Doubly fed induction generators in conjunction with frequency converters allow the economic construction of large wind power plants with variable speed drives and a rated power output of up to several MW. Compared to fixed speed generators, the advantages of this configuration are high energy yields despite changing wind speeds, reduced negative effects on the grid and the possibility of

Georg Ofner; Oliver Koenig; Guenther Dannerer; Roland Seebacher

2010-01-01

464

Analysis on the direct-driven high power permanent magnet generator for wind turbine  

Microsoft Academic Search

In this paper, the permanent magnet synchronous generator of 1.5 MW output power which is driven directly without gear system is designed by conventional magnetic equivalent circuit method and analyzed by finite element method for verification of design. We analyzed the characteristics of generator like no load, rated load, short circuit condition and demagnetization of permanent magnet. The last, the

Ki-Chan Kim; Seung-Bin Lim; Ki-Bong Jang; Sung-Gu Lee; Ju Lee; Yeoung-Gyu Son; Young-Kil Yeo; Soo-Hyun Baek

2005-01-01

465

Universal Power Line Manager for Wind Turbine Generator Connected with a Microgrid  

Microsoft Academic Search

A wind power plant meets many power quality issues when it is connected with a microgrid, because the voltage and frequency are not stable in a microgrid. This article envisages a new power quality conditioner to regulate the supply frequency, control the power flow, minimize current harmonics, and regulate the voltage for a fixed-speed induction generator type wind generator. The

P. Jeno Paul; I. Jacob Raglend; T. Ruban Deva Prakash

2012-01-01

466

Design of optimal PI controllers for doubly fed induction generators in wind turbines using genetic algorithm  

Microsoft Academic Search

This paper presents a design procedure based on evolutionary computation, more specifically on genetic algorithm (GA) to obtain optimal PI controllers to the static converter connected to the rotor of doubly fed induction generators (DFIGpsilas), in variable speed wind generation systems connected to the electrical grid. The converter of the DFIG has a protection system that monitors continuously the machine

João P. A. Vieira; Marcus N. A. Nunes; Ubiratan H. Bezerra

2008-01-01

467

3D-viscous flow simulation and performance prediction of a complete model francis turbine  

Microsoft Academic Search

The Navier-Stokes flow analysis has been applied to successfully predicted flow characteristics and energy losses in different hydraulic turbine components. It has been used to design and optimize hydraulic turbine components. In this paper, the three-dimensional viscous flow is simulated through the whole flow passage of the model Francis turbine. The whole flow passage includes spiral case, distributor, runner and

Huimin Xiao; Bo Yu

2010-01-01

468

Constructing a Plastic Bottle Wind Turbine as a Practical Aid for Learning about Using Wind Energy to Generate Electricity  

ERIC Educational Resources Information Center

|A simple horizontal axis wind turbine can be easily constructed using a 1.5 l PET plastic bottle, a compact disc and a small dynamo. The turbine operates effectively at low wind speeds and has a rotational speed of 500 rpm at a wind speed of about 14 km h[superscript -1]. The wind turbine can be used to demonstrate the relationship between open…

Appleyard, S. J.

2009-01-01

469

Coupled-field thermal analysis of high-speed permanent magnetic generator applied in micro-turbine generator  

Microsoft Academic Search

This paper presents a kind of investigative method with thermal stability of high-speed permanent magnetic generator through a simplified model employing a air-cooling system. Given the certain circumstance, the losses and air flux is known, it is easy to estimate the heat rate took away by the cooling air, and easy to obtain the temperature distribution of the stator at

Yuan Chun; Wei Keying; Wang Xiaonian

2005-01-01

470

Second-Generation Pressurized Fluidized Bed Combustion: Small gas turbine industrial plant study  

SciTech Connect

Second-Generation Pressurized Fluidized Bed Combustion (PFBC) plants provide a coal-fired, high-efficiency, combined-cycle system for the generation of electricity and steam. The plants use lime-based sorbents in PFB combustors to meet environmental air standards without back-end gas desulfurization equipment. The second-generation system is an improvement over earlier PFBC concepts because it can achieve gas temperatures of 2100{degrees}F and higher for improved cycle efficiency while maintaining the fluidized beds at 1600{degrees}F for enhanced sulfur capture and minimum alkali release. Second-generation PFBC systems are capable of supplying the electric and steam process needs of industrial plants. The basic second-generation system can be applied in different ways to meet a variety of process steam and electrical requirements. To evaluate the potential of these systems in the industrial market, conceptual designs have been developed for six second-generation PFBC plants. These plants cover a range of electrical outputs from 6.3 to 41.5 MWe and steam flows from 46,067 to 442,337 lb/h. Capital and operating costs have been estimated for these six plants and for equivalent (in size) conventional, coal-fired atmospheric fluidized bed combustion cogeneration plants. Economic analyses were conducted to compare the cost of steam for both the second-generation plants and the conventional plants.

Shenker, J.; Garland, R.; Horazak, D.; Seifert, F.; Wenglarz, R.

1992-07-01

471

Second-Generation Pressurized Fluidized Bed Combustion: Small gas turbine induustrial plant study  

SciTech Connect

Second-Generation Pressurized Fluidized Bed Combustion (PFBC) plants provide a coal-fired, high-efficiency, combined-cycle system for the generation of electricity and steam. The plants use lime-based sorbents in PFB combustors to meet environmental air standards without back-end gas desulfurization equipment. The second-generation system is an improvement over earlier PFBC concepts because it can achieve gas temperatures of 2100[degrees]F and higher for improved cycle efficiency while maintaining the fluidized beds at 1600[degrees]F for enhanced sulfur capture and minimum alkali release. Second-generation PFBC systems are capable of supplying the electric and steam process needs of industrial plants. The basic second-generation system can be applied in different ways to meet a variety of process steam and electrical requirements. To evaluate the potential of these systems in the industrial market, conceptual designs have been developed for six second-generation PFBC plants. These plants cover a range of electrical outputs from 6.3 to 41.5 MWe and steam flows from 46,067 to 442,337 lb/h. Capital and operating costs have been estimated for these six plants and for equivalent (in size) conventional, coal-fired atmospheric fluidized bed combustion cogeneration plants. Economic analyses were conducted to compare the cost of steam for both the second-generation plants and the conventional plants.

Shenker, J.; Garland, R.; Horazak, D.; Seifert, F.; Wenglarz, R.

1992-07-01

472

Hydraulic Tidal and Wind Power System Sizing.  

National Technical Information Service (NTIS)

Tidal energy, offshore wind energy, and onshore wind energy can be converted to electricity at a central ground location by converting their respective energies into high-pressure hydraulic flows that are transmitted to a system of hydraulic generators by...

J. A. Jones

2012-01-01

473

Hydraulic Car  

NSDL National Science Digital Library

In this activity, learners build cars using syringes and water-powered hydraulics. Learners construct the car frame out of cardboard and set up a hydraulic system to raise and lower the car. Use this project to introduce learners to incompressible fluids and Pascal's Principle.

Workshop, Watsonville E.

2011-01-01

474

Constructing a plastic bottle wind turbine as a practical aid for learning about using wind energy to generate electricity  

NASA Astrophysics Data System (ADS)

A simple horizontal axis wind turbine can be easily constructed using a 1.5 l PET plastic bottle, a compact disc and a small dynamo. The turbine operates effectively at low wind speeds and has a rotational speed of 500 rpm at a wind speed of about 14 km h-1. The wind turbine can be used to demonstrate the relationship between open circuit voltage and wind speed, and to show how varying the size, shape and number of turbine blades can affect power output from the device.

Appleyard, S. J.

2009-07-01

475

Velocity pump reaction turbine  

DOEpatents

An expanding hydraulic/two-phase velocity pump reaction turbine including a dual concentric rotor configuration with an inter-rotor annular flow channel in which the inner rotor is mechanically driven by the outer rotor. In another embodiment, the inner rotor is immobilized and provided with gas recovery ports on its outer surface by means of which gas in solution may be recovered. This velocity pump reaction turbine configuration is capable of potential energy conversion efficiencies of up to 70%, and is particularly suited for geothermal applications.

House, Palmer A. (Walnut Creek, CA)

1984-01-01

476

Velocity pump reaction turbine  

DOEpatents

An expanding hydraulic/two-phase velocity pump reaction turbine including a dual concentric rotor configuration with an inter-rotor annular flow channel in which the inner rotor is mechanically driven by the outer rotor. In another embodiment, the inner rotor is immobilized and provided with gas recovery ports on its outer surface by means of which gas in solution may be recovered. This velocity pump reaction turbine configuration is capable of potential energy conversion efficiencies of up to 70%, and is particularly suited for geothermal applications.

House, Palmer A. (Walnut Creek, CA)

1982-01-01

477

Gas-turbine-topped hybrid power plants for the utilization of geopressured geothermal resources  

NASA Astrophysics Data System (ADS)

The paper presents an analysis of the performance and economics of a novel hybrid energy conversion system that would efficiently utilize the methane, hydraulic and thermal energy produced by geopressured-geothermal resources. The novel system comprises a methane-fueled gas turbine whose waste heat is used to superheat the vapor generated from the geopressured brine in an otherwise-conventional double-flash power plant. The analysis indicates that, compared to a conventional double-flash system, the hybrid system can generate nearly 44 percent more work from the thermal energy of the brine, in addition to the outputs of the gas and hydraulic turbines. Conservative preliminary economic estimates indicate that the unit installed cost of the hybrid plant would be about 25 percent lower than that of a conventional system constructed at the same geopressured resource site.

Khalifa, H. E.

1981-01-01

478

Start-up improvement in turbine mode for high head PSP machine  

NASA Astrophysics Data System (ADS)

Pumped Storage Plants (PSP) using reversible pump-turbines are today the most efficient way of storing large amounts of electrical energy at acceptable costs. However, in order to suit high and sudden variations in power demand, a large amount of power must be available to be released quickly at the required time. When peak power production is required, then start-up in turbine mode must be fast, efficient and reliable. During start-up, the machine must operate at a stable speed close to the no-load condition (i.e. close to the runaway characteristic) while all synchronized guide vanes are open slightly. This is very challenging for high head units that can have an S-shaped characteristic in the turbine quadrant close to the no load condition. This paper focuses on a new hydraulic design that provides an improvement of the S-shaped characteristic and thus removes all speed instability sources during the start-up sequence of the turbine in a large operating head range while not involving a special stabilizing technique. Hydraulic design is fundamental for any PSP. Given the constraints in generating and pumping modes, S-shaped phenomena become even more important and then more difficult to be mastered for high head machines. Thanks to the pump-turbine design methodology, the use of CFD tools as well as model tests for optimization, a dedicated high head pump-turbine design was developed to achieve a significant improvement of the S-shaped characteristic using all synchronized guide vanes. This paper describes the S-shaped phenomena from a hydraulic point of view. We also detail the numerical study, the model tests results and the turbine coupling sequence simulation results for which a comparison is done between a typical high head design and a dedicated high head design to the S-shaped reduction.

Houdeline, J. B.; Liu, J.; Lavigne, S.; Laurant, Y.; Balara, L.

2012-11-01

479

Discrete-time block control for a doubly fed induction generator coupled to a wind turbine  

Microsoft Academic Search

This paper proposes a control scheme based on the block control technique using sliding modes, for a doubly fed induction generator connected to an infinity bus. This control scheme is compared with a linear control using PIs. Simulation results in PSCAD\\/EMTDC are included to illustrate the applicability of the scheme. A comparison between the PI controller and the proposed block

Riemann Ruiz; Edgar N. Sanchez; Alexander G. Loukianov; Ronald G. Harley

2011-01-01

480

Getting round the lock-in in electricity generating systems: the example of the gas turbine  

Microsoft Academic Search

The purpose of this paper is to show how, in a situation of “lock-in” in the environment of electricity generation, a new technology can succeed in overcoming this situation and become competitive. Our study will show that it is possible to get round the lock-in by bringing into play the increasing returns of adoption in particular production niches, where the

Jorge Islas

1997-01-01

481

Modeling of Wind Turbines Based on Doubly-Fed Induction Generators for Power System Stability Studies  

Microsoft Academic Search

This paper deals with modeling of the doubly-fed induction generator (DFIG) and the corresponding converter for stability studies. To enable efficient computation, a reduced-order DFIG model is developed that restricts the calculation to the fundamental frequency component. However, the model enhancement introduced in this paper allows the consideration of the alternating components of the rotor current as well, which is

Istvan Erlich; JÖrg Kretschmann; Jens Fortmann; Stephan Mueller-Engelhardt; Holger Wrede

2007-01-01

482

Gas-turbine-topped hybrid power plants for the utilization of geopressured geothermal resources  

Microsoft Academic Search

The paper presents an analysis of the performance and economics of a novel hybrid energy conversion system that would efficiently utilize the methane, hydraulic and thermal energy produced by geopressured-geothermal resources. The novel system comprises a methane-fueled gas turbine whose waste heat is used to superheat the vapor generated from the geopressured brine in an otherwise-conventional double-flash power plant. The

H. E. Khalifa

1981-01-01

483

VORTICITY IN HYDRAULIC POWER EQUIPMENT  

Microsoft Academic Search

The paper presents a numerical simulation and analysis of the flow inside a hydraulic poppet valve and hydraulic control valve. This paper summarizes the successful application of Computational Fluid Dynamics (CFD) analysis to study the effect of spool slot configuration on spool and cavitation generation inside both the poppet valve and control valve. The hidrodynamic field inside in the valve

Romeo F. SUSAN-RESIGA

484

Superheater Hydraulic Model Test Plan.  

National Technical Information Service (NTIS)

The plan for conducting a hydraulic test on a full scale model of the AI Steam Generator Module design is presented. The model will incorporate all items necessary to simulate the hydraulic performance characteristics of the superheater but will utilize m...

M. Gabler R. M. Oliva

1973-01-01

485

Wind turbine blade pitch control system  

Microsoft Academic Search

Wind turbine blade pitch control system including hydraulic actuators which pivotally drive the blades about the longitudinal axis thereof to adjust the blade pitch. The actuators are supplied with hydraulic fluid from independent sources thereof for normal blade pitch adjustment and feathering. Means are provided which, during feathering, isolate the pressurization and drain of the actuators from certain system components,

1982-01-01

486

Integrating steam turbine control with energy management systems  

SciTech Connect

The use of steam turbines in industrial applications to produce electrical power while supplying steam to process headers (cogeneration) is common in many plants today. To meet industrial system requirements turbine control has evolved over the years to a level of sophistication today where the many varied steam requirements can be easily accommodated with existing turbine control systems. Some of these systems are functionally described and the method of operator interface outlined. With rising fuel costs and the development of plant computer control, turbine control systems must now interface with centralized energy managment systems. The methodology for interfacing mechanical hydraulic and electro-hydraulic turbine control is functionally described.

Nock, H.T.; Wagner, J.B.; Medeiros, C.W.

1981-01-01

487

An Approach of Uncertainty Evaluation for Thermal-Hydraulic Analysis  

SciTech Connect

An approach to evaluate uncertainty systematically for thermal-hydraulic analysis programs is demonstrated. The approach is applied to the Peach Bottom Unit 2 Turbine Trip 2 Benchmark and is validated. (authors)

Katsunori Ogura [CSA of Japan Company, Ltd., 1-3-9, Shibadaimon, Minato-ku, Tokyo 105-0012 (Japan); Hisashi Ninokata [Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152 (Japan)

2002-07-01

488

Operating experience with the 200 kW MOD-OA wind turbine generators  

NASA Astrophysics Data System (ADS)

The machine configuration and its advantages and disadvantages, particularly as it affects reliability are discussed. The machine performance, both availability and power output characteristics are described. The Mod-OA operational experience is documented. The characteristics of the wind energy generated, the machine performance, and the subsystem strengths and weaknesses are discussed. An assessment of the project success in fulfilling its goals and objectives is also presented.

Birchenough, A. G.; Saunders, A. L.; Nyland, T. W.; Shaltens, R. K.

489

A synergetic control approach to grid-connected, wind-turbine doubly-fed induction generators  

Microsoft Academic Search

The doubly-fed induction generator (DFIG) with back-to-back four-quadrant power converters between the rotor side and the stator side can realize an efficient and flexible conversion from wind energy to electric energy. Based on the stator-flux orientation control strategy, this paper aims to introduce a synergetic control synthesis method and applies this method in the control of the DFIGpsilas rotor-side power

Xunwei Yu; Zhenhua Jiang; Yu Zhang

2008-01-01

490

Erosion-corrosion modelling of gas turbine materials for coal-fired combined cycle power generation  

Microsoft Academic Search

The development of coal-fired combined cycle power generation systems is receiving considerable worldwide interest. The successful development and commercialisation of these new systems require that all the component parts are manufactured from appropriate materials and that these materials give predictable in-service performance. Corrosion and erosion-corrosion, resulting from coal derived particulates, deposition and gaseous species, have been identified as potential life

N. J. Simms; J. E. Oakey; D. J. Stephenson; P. J. Smith; J. R. Nicholls

1995-01-01

491

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

492

Direct Drive Wind Turbine.  

National Technical Information Service (NTIS)

A wind turbine is provided that minimizes the size of the drive train and nacelle while maintaining the power electronics and transformer at the top of the tower. The turbine includes a direct drive generator having an integrated disk brake positioned rad...

C. Bevington D. Costin G. Bywaters J. Stowell W. Banforth

2004-01-01

493

Aerodynamic Testing of Small Turbines.  

National Technical Information Service (NTIS)

A cold flow turbine rig test section was designed to simulate prototype engine inlet and outlet gas paths. A turbulence generator is incorporated at gas inlet. Second stage turbines can be tested with first stage turbines in front of them to establish the...

U. Okapuu

1987-01-01

494

Development and demonstration of a vertical axis wind turbine POWERHOUSE  

NASA Astrophysics Data System (ADS)

A performance of reliable lower cost base assembly and controls was designed for the electricity generating wind energy conversion system of the VAWTPOWER 185 wind turbine. The base assembly includes low speed shaft and couplings, disc or drum brake, hydraulic or pneumatic brake control systems, speed increasing gear box, high speed shaft and couplings, induction motor/generator, bottom rotor bearings, lightning and ground fault protection, support structure, and environmental protection. VAWTPOWER 185 is a 200 kW capacity Vertical Axis Wind Turbine rated 185 kW at 37 mph. After system analysis, subsystem definition, detailed design and engineering, and development of a test plan, two versions of the powerhouse were fabricated and tested. Both appear ready for commercial production.

Vosburgh, P. N.

1984-06-01

495

Control of a dynamic brake to reduce turbine-generator shaft transient torques  

SciTech Connect

A resistive, thyristor-controlled brake is used to damp transient torques in large thermo-electric generators supplying series-compensated transmission lines. Emphasis is placed on developing a suitable control algorithm and testing the algorithm through a wide variety of different operating configurations. Discrete-level Generalized Predictive Control is examined as one possible approach to optimal control of the brake. Some problems with implementation of GPC on the system are discussed. Prony analysis is used to identify system transfer functions which are then related to control design considerations and robustness properties.

Donnelly, M.K.; Smith, J.R.; Johnson, R.M. (Montana State Univ., Bozeman, MT (United States)); Hauer, J.F. (Bonneville Power Administration, Kalispell, MT (United States)); Brush, R.W. (Montana Power Co., Butte, MT (United States)); Adapa, R. (Electric Power Research Inst., Palo Alto, CA (United States))

1993-02-01

496

Sound measurements and observations of the MOD-OA wind turbine generator  

NASA Astrophysics Data System (ADS)

Sound measurements are reported for a wind velocity of about 5 m/s and a power output of about 70 kW. Both broadband and narrowband data were obtained for a range of distances and azimuth angles from the machine. Both discrete frequency and broadband components were identified. Loading harmonics at multiples of the blade passage frequency and electrical generator harmonics at multiples of the shaft speed dominated the spectrum below 100 Hz. The 10,000 Hz peak is believed to be of mechanical origin in the nacelle and the other arises from blade aerodynamic sources. Aural detection distances of about 525 m upwind and 850 downwind were observed.

Shepherd, K. P.; Hubbard, H. H.

1982-02-01

497

Sliding-Mode-Based Direct Power Control of Grid-Connected Wind-Turbine-Driven Doubly Fed Induction Generators Under Unbalanced Grid Voltage Conditions  

Microsoft Academic Search

This paper proposes an improved direct power control (DPC) strategy of grid-connected wind-turbine-driven doubly fed induction generators (DFIGs) when the grid voltage is unbalanced. The DPC scheme is based on the sliding mode control (SMC) approach, which directly regulates the instantaneous active and reactive powers in the stator stationary reference frame without the requirement of either synchronous coordinate transformation or

Lei Shang; Jiabing Hu

2012-01-01

498

Analysis of variable-frequency currents superimposed on DC currents in asynchronous HVDC links in stressing turbine-generator-exciter shafts  

Microsoft Academic Search

The paper makes an indepth analysis of the excitation of shaft torsional vibrations in steam turbine-generator-exciter shafts by variable-frequency ripple currents superimposed on DC currents in asynchronous links using the finite element and reduced models of the machine shafts. Frequencies at which sympathetic shaft torsional vibrations would be excited by modulation product harmonics in 50 Hz\\/50 Hz and 50 Hz\\/60

T. J. Hammons; J. J. Bremner

1995-01-01

499

Airship-floated wind turbine  

SciTech Connect

A wind turbine, by use of a tethered airship for support, may be designed for the economical recovery of power at heights of 2,000 feet or more above ground, at which height power density in the wind is typically three times the power density available to a conventionally supported wind turbine. Means can be added to such an airship-floated wind turbine which will permit its generators to be used to meet load demand even during periods of little or no wind. Described to this end is a wind