Development of techniques and analytical tools for utilizing the inherent controllability of multiterminal hvdc transmission to enhance the performance of an integrated ac/dc power system were explored. Specific investigations that were performed during the course of the project were described, including steady state operation of ac/dc ...

Increasing complexity of high-voltage direct current (HVDC) transmission systems places new demands on alternating current/direct current (ac/dc) power converters. The possibility of using advanced power conversion techniques, specifically force-commutate...

A mathematical model is developed to investigate the dynamic stability dc system in parallel with an ac transmission system. The dynamic stability model for a one machine infinite bus system is developed first. This model is used to determine the dynamic stability of the parallel ac - dc power system under ...

The identification of hardware developments and system applications which exemplify cost and operational advantages of integrated ac/dc power systems is discussed. The three principal tasks undertaken were: assessment of equipment developments; quantification of operational advantages; and interaction with system planners. The dissemination of information ...

The feasibility for implementation of a concept for direct ac/dc multikilowatt power conversion with

This paper describes the implementation of both Point of Collapse (PoC) methods and continuation methods for the computation of voltage collapse points (saddle-node bifurcations) in large ac/dc systems. A comparison of the performance of these methods is presented for real systems of up to 2,158 buses. The paper discusses computational details of the implementation of the PoC ...

This working group report presents dc benchmark models tailored to ac/dc interaction. This is to encourage comparisons of the performance of different control strategies or computational tools related to various ac/dc interaction phenomena and system dynamic performance. System data and results are available on diskette or through e-mail.

The possibility of abnormal harmonic generation in an ac system feeding a converter load is examined from the standpoint of automatic control systems used in modern hvdc transmission systems. It is shown that with certain types of automatic controls, the firing angles of converter valves may sustain some errors, which in turn could generate abnormal harmonic currents in the ...

The bibliography contains citations concerning types and applications of adjustable speed drives (ASD). Uses in heat pumps, fans, compressors, electric motors, boiler feed systems, and power transmission are described. Coverage includes AC-DC motors, induction motors, and brushless electric motors. Energy cost savings are also ...

... heat sinking of the electronic components was ... conception of the mechanical packaging was established. ... not react instantaneously to short circuits. ...

Increasing complexity of high voltage direct current (HVDC) transmission systems places new demands on alternating current/direct current (ac/dc) power converters. The possibility of using advanced power conversion techniques, specifically force commutated conversion, is discussed. Recommended further work includes ...

It is well known that power system transient stability can be improved by utilizing the effects of the power flow in a dc transmission link in a parallel ac--dc power system. The literature describes various control schemes that have been used for this purpose. In a recent experimental study it ...

... SUPPLIES), (*RADAR TRANSMITTERS, (*PHASED ARRAYS, POWER SUPPLIES), ALTERNATING CURRENT, DIRECT CURRENT, CIRCUITS ...

With the increasing use of dc transmission in existing ac networks, the possibility of ac and dc circuits running parallel to each other and sharing the same right-of-way or even the same tower is increasing. It is important from the point of view of design of such hybrid ac/dc transmission lines to determine the nature and extent of ...

... and a pair of positive and negative switching DC/DC converter sections connected to said AC/DC converter section and receiving a pair of positive ...

This dissertation first develops an efficient solution technique for solving the steady-state electrical conditions of an integrated ac-dc power system based on the observation that the equivalent loads representing the dc network are independent of the ac load-flow solution. The absence of iterations back and forth between ac and dc load flows, a constant ...

The power system of Hydro-Quebec has a peak load of approximately 27 GW. The great distance between the production sites and the load centers introduces stability limitations, which is the reason why the Quebec grid cannot be economically synchronized (through ac transmission with limited capacity) with the U.S. northeastern network. ...

This report contains a work statement for a study in which the objective is to examine the dynamic relationships of integrated ac/dc power systems containing high voltage direct current circuit breakers; a one-page discussion of the effects of a planned HVDC system on interconnected ac systems located in the general vicinity; and a quarterly progress ...

Conventional ac-dc converters present two important disadvantages: they create harmonic currents and require reactive power. To reduce these drawbacks, a diode rectifier is directly connected in series with a chopper controlled by pulsewidth modulation. Both are preceded by a series inductance (added to the equivalent one of the power ...

the generator angle and the DC power Pdc under the case 1 fault; and Figs. 6 and 7 show the system dynamic to be Pd dc � 0:4 in order to minimize the change of DC line power and to keep the pre-fault generatorA nonlinear robust HVDC control for a parallel AC/DC power system Hongzhi Cai a , Zhihua Qu b

Results achieved by the intermediate power level ac-dc model in Philadelphia demonstrate the unusual features and advantages of this research tool for working toward accomplishment of over-all aims of the project. Insofar as can be determined, it is presently the only facility capable of evaluating the dynamic interactions between ...

Undersea transmission lines and shoreline AC-DC conversion stations and near-shore transmission lines are being considered as part of a system for transporting energy between the Hawaiian Islands. These facilities will need to be designed so that they wil...

The assimilation of large numbers of large wind turbine generators into utility grids posses significant operational questions. This paper explores design and operational issues associated with the interconnection of wind farms using a controllable AC/DC/AC series-connected interface. The study is in terms of steady-state operation of and transient effects on both the ...

Optimal Modulation Controllers for multiarea ac/dc systems are designed by a recursive algorithm that determines the state weighting matrix Q of a linear quadratic performance criterion. The basic feature of the proposed method is the reduction of the number of iterations as well as minimization of the calculations involved. This method is applied for eigenvalue assignment of ...

... DTIC's PDF and Excel spreadsheet versions of Congressional ... 208 30 50/60/400Hz power source. ... thyristor series LC resonant inverter power stage ...

Laminate structures composed of alternating thin layers of conductor and dielectric material are commonly used in energy storage and transmission components. The failure of the dielectric layers in regions of high field stress, with applied 60 Hz ac, dc a...

Mid to late 1980's power management technology needs to support development of a general purpose space platform, capable of suplying 100 to 250 KWe to a variety of users in low Earth orbit are examined. A typical, shuttle assembled and supplied space platform is illustred, along with a group of payloads which might reasonably be expected to use such a facility. Examination of ...

This paper presents the results of theoretical and experimental development of a new dc-ac-dc converter for superconducting magnet power supplies. The basic operating principles of the circuit are described followed by a theoretical treatment of the dynam...

A Telecom power supply is studied and analyzed from control system viewpoint. It consists of three stages: AC/DC rectifier, a backup battery, and a Telecom load. The AC/DC rectifier stage can be composed of paralleled DC/DC converters preceded by parallel...

A Telecom power supply is studied and analyzed from control system viewpoint. It consists of three stages: AC/DC rectifier, a backup battery, and a Telecom load. The AC/DC rectifier stage can be composed of paralleled DC/DC converters preceded by parallel...

The objective of this project is to establish the best power conversion technology (technologies) applicable to a number of advanced energy storage conversion technologies, including a study of common conversion technology, modular approach to constructio...

The power modulation of a high voltage direct current (HVDC) system for stabilization of an ac/dc network was investigated. It was found that simultaneous modulation of both dc current and voltage was more effective than just current modulation by itself, since the dc voltage modulation could be used to minimize the reactive power changes resulting from a ...

Existing 34, ac-dc low-harmonic rectiifiers are costly and require complex control schemes to minimize input current harmonics. Introduced here are three new classes of low cost 34, ac-dc high power factorllow harmonic controlled rectifiers. These are derived from parent dc-dc convrter topologies containing boost-type inputs, buck-type ...

Free-wheeling power plants using free replenishable hydraulic forces of winds and water currents would consist of most or all of the following: fore and after cones to increase throughput; duplex impellers; rotors with dc/ac excitation, ac/dc inverters and dc field coils; stators with ac output of varying frequency, voltage and power; ...

This report describes the analysis tools developed at West Virginia University that can be implemented to optimally design coal mine electrical systems. The basic analytical tools for all power systems are the load-flow and short-circuit analysis. Well known programs have been developed for analysis of ac transmission and distribution systems, but they are ...

The power system dynamic instability problem on the Pacific AC/DC Intertie was solved by modulating the converter power of the HVDC tie line. An alternate control approach using magnetic energy storage is explored for more general power systems without HVDC lines. Dynamic equivalents of power ...

Increasing complexity of high-voltage direct current (HVDC) transmission systems places new demands on alternating current/direct current (ac/dc) power converters. The possibility of using advanced power conversion techniques, specifically force-commutated conversion, is discussed. Previous work on this concept and ...

The activity reported herin is the proposed system study to examine the dynamic relationship of integrated ac/dc systems wherein the existence of direct current circuit breakers is postulated.

The analysis and design of a semi-passive radio frequency identification (RFID) tag is presented. By studying the power transmission link of the backscatter RFID system and exploiting a power conversion efficiency model for a multi-stage AC-DC charge pump, the calculation method for semi-passive tag's read range is ...

Abstract�This paper discusses the basic construction procedure and topological possibilities of creating ac/dc converters out of simple dc/dc converters. It is shown that two separately controlled dc/dc converters are sufficient for producing a regulated dc output and shaping the input current, from an ac voltage source, without the need for input rectifiers. Some design ...

During the reporting period, breakdown measurements with ac, dc, and impulse voltages were taken on several polymer film samples immersed in boiling liquid helium. The observed impulse strengths were found to be a factor of two to a factor of three higher than previously-measured ac strengths. Progress was made on experimental equipment, including ...

Enhancement of the overall system dynamic performance of an existing ac/dc scheme is possible by minor modifications in the NVDC controls. The paper presents some control modifications for the Chateauguay HVDC back-to-back 1000 MW scheme with interconnections to the Beauharnois generators and to the 765 kV intertie to NYPA. These modifications lead to a remarkable improvement ...

A non-linear model of a combined high-voltage ac-dc power system was digitally simulated. The model is used for the study and prediction of the effects of transient interactions between a high-voltage-direct-current (HVDC) transmission line and turbine-generator-shaft torsional behavior when the system is subjected to large ...

This program introduces the technician to three phase a-c power and its relationship to rectifier power conversion systems. A brief introduction is given as to the engineering significance of various parameters such as, phase rotation, ac power relationsh...

The AC-DC Power Processor Type I Power Module furnishes O-100ADC over an output voltage range of 24 to 32VDC from a 120/208 30 50/60/400Hz power source. Remote output voltage sensing at the load circuit is provided to eliminate the IR drop of the power di...

Considerable incentives exist for utilities to place hvdc transmission lines along the same right of way as ac lines. One consequence of such an application is steady state induction of fundamental frequency voltages into the dc circuit. The resulting current ripple on the dc converter can cause continuous offset transformer saturation, with many consequent impacts upon system ...

A new static AC/DC portable military power source providing either 115 V, 400 Hz, AC or 28 V DC, or a combination of both, is described. The primary power source for the AN/GSQ-152( ) Power Supply Set is a thermoelectric generator operating in parallel wi...

DoublyFed Induction Generator (variable speed) Plant Feeders ac dc partial power dc ac Type 4 10 generator full power ac to dc dc to ac Fullconverter interface #12;2. What is a wind plant? Type 3 Doubly Fed/3 of full power rating � Eliminates wind gustinduced power spikes ...

A novel approach is presented to improve the dynamic stability of a parallel AC-DC power system. The developed scheme employs a proportional-integral-derivative (PID) power system stabilizer (PSS) and a PID rectifier current regulator (RCR) to enhance the damping for the electromagnetical mode of the system. The parameters of the ...

Existing 3{phi} ac-dc low-harmonic rectifiers are costly and require complex control schemes to minimize input current harmonics. Introduced here are two new classes of low cost 3{phi} ac-dc high power factor/low harmonic controlled rectifiers. These are derived from parent dc-dc converter topologies containing boost-type inputs and ...

... TECHNIQUES FOR DETERMINING PERFORMANCE AND RATINGS OF CASED CAPACITORS UNDER COMBINED AC-DC OPERATION AS A ...

The basic problem investigated is as follows: assume a system where the sending end and receiving end are separated by a transmission line of length lambda which is loaded to some practical level, say surge impedance loading. A disturbance occurs somewhere in the load area and this load is dumped by opening a circuit breaker at the receiver end low voltage terminals. The ...

In this work Carbon nanotubes have been synthesized by arc discharge in open air. A TIG welding ac/dc inverter was used as the power source for arc discharge. During each run of the arc discharge based synthesis, the anode was a low purity (approximately 85% C by weight) graphite rod. The effect of varying the atmosphere on the yield of soot of the carbon ...

to produce hydrogen by electrolyzing water � Characterize electrolyzer performance under variable input power Bridge Current Wind-Electrolysis Project AC Source (Wind Turbine) Simulator 10kW Wind Turbine AC-DC Power � Power electronics (PE) regulating voltage � 50A avg. current � No added benefit of high ...

A power factor analysis of the input part of an advanced AC/DC/AC converter for variable speed wind turbines is presented. Two types of rectifying input converters are compared: the boost rectifier, consisting of three AC inductors, a three-phase diode br...

, power electronic circuits can be configured as: 1. Diode rectifiers( )ac dc 2. Controlled rectifiers the operation of a few circuits to understand how they are used in wind power. The first is the diode rectifier: Fig. 3.14 Diode Rectifier Fig. 3.15 Output Voltage When sV is +, D1 conducts and D2 is off, so o

An inductor-converter bridge (ICB) is a solid state DC-AC-DC power converter system for bidirectional, controllable, energy transfer between two coils. The ICB is suitable for supplying large pulsed power to such magnets as the superconducting equilibrium field coil of the proposed tokamak power reactors from ...

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

The hardware development and systems applications are described for high voltage direct current (HVDC) power systems. Particular emphasis is given to exemplifying cost and operational advantages of integrated ac/dc power systems. Progress is reported in the development of the following: HVDC converters; computerized simulation of HVDC ...

ABSTRACT The Power Systems branch at JSC faces a number of complex issues as it readies itself for the President's initiative on future space exploration beyond low earth orbit. Some of these preliminary issues - those dealing with electric power generati...

This is volume 2 of the proceedings of the IEEE International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth held during January 1996, in New Delhi, India. The topics of this volume include AC/DC and AC/AC converters, induction generators, traction and electric vehicle drives, application of neural networks and fuzzy logic ...

Each of the twelve Booster Main Magnet Power Supply modules consist of two three-phase, full-wave rectifier bridges in series to provide a 560 VDC maximum output. The harmonic contents of the twelve-pulse ac-dc converter output are multiples of the 60 Hz ac power input, with a predominant 720 Hz signal greater than 14 dB in magnitude ...

In general, high voltage direct current (HVDC) systems are used to transmit energy between two alternating current (HVAC) systems and require, in addition to a transmission line, two ac/dc conversion stations. In describing the basic design criteria, comp...

In a study conducted by the General Electric Company for EPRI, the power modulation of a high-voltage direct-current (HVDC) system for stabilization of an ac/dc network was investigated. The use of both active and reactive power modulation (as opposed to only active modulation techniques) was studied. It was found that simultaneous modulation of both dc ...

This paper presents the results of theoretical and experimental development of a new dc-ac-dc converter for superconducting magnet power supplies. The basic operating principles of the circuit are described followed by a theoretical treatment of the dynamics and control of the system. The successful results of the first experimental operation and control ...

"This is an educational module dedicated to basic power electronic circuits. The module includes DC/DC converters, basic diode and thyristor converter systems, AC/DC inverter, space vector modulation and basic signal theory. In the future there will be minor changes (mainly additions and corrections). The material currently is available in German, English, ...

The authors discuss field experience with three ac-dc converter installations. A rectifier and two self-commutated inverters comprise the evaluated equipment. Each case deals with slightly different aspects in the application of converters on power systems. The three cases compliment each other to provide insight into a majority of the problems and ...

The paper presents a formulation for coordinating all controllable reactive power sources, including the DC converters of a multiterminal DC system, to correct bus voltage violations. Based on the formulation, an algorithm using Linear Programming solution technique has been developed. The effectiveness of this algorithm to correct bus voltage violations in a 30 bus, 5 DC ...

The final report concludes that the two most likely long-range candidates for converting dc to ac power from batteries and fuel cells are the basic current-fed line commutated inverter (a derivative of HVDC technology), and the voltage-fed conduction angl...

This report covers effort under Contract DAAK70-77-C-0035 to further develop the ac-to-dc section or converter portion of a 15 kW general purpose power conditioner or frequency changer. Previous Delco effort under Contract DAAK02-72-C-0210 had provided a ...

An AC-DC converter based on a parallel drive of two piezoelectric ceramic transformers was investigated. The transformers operate in a fundamental contour extensional vibration mode which has a large electromechanical coupling factor notwithstanding the use of a piezoelectric transversal effect. The converter includes Al electrolytic capacitors for smoothing circuits and metal oxide semiconductor ...

As more dc terminals, in the form of links or multiterminal systems, come into operation, the opportunity for controlling ac line flows using the injected dc powers increases. This paper describes a study undertaken to determine the feasibility of using an on-line method to coordinate the dc injections of a multiterminal dc system to dynamically control the ...

of equipment. The power supplies in the lab are capable of delivering very high current. High current can lead and Laboratory Rules Sample Title Page for Lab Reports Lab-1: AC/DC Circuits and Measurements Lab-2: AC Transformers Lab-3: Brushed DC Motors Lab-4: Squirrel-Cage Induction Motors and VFDs Lab-5: Synchronous

This paper presents a general and efficient method for transient simulation of HVDC converters. The proposed method utilizes a new algorithm, based on network topological concepts, which provides an efficient solution to the problem of modeling the inherently nonlinear characteristics and time varying topology of static power converters caused by the switching action of the ...

The purpose of this project is to develop a comprehensive treatment of the Compound HV-AC-DC System, that is the up-to-date large power system in all its aspects: Analysis and operation with at least some aspects of planning, normal operating conditions, ...

Matrix converters offer certain advantages over conventional AC-DC-AC conversion such as elimination of reactive elements, inherent bi-directional power flow capability, increased reliability and compactness. This paper explores the reactive and harmonic compensation capability of a matrix converter. Space vector modulation technique has been used for ...

with rectifiers to form RF-to-dc converters having narrow-range resistive input characteristics is also treated�dc converter, comprising an inverter stage, a transformation stage, and a rectifier stage [1]�[10]. Manuscript an inverter (dc�ac) circuit, a transformation/matching circuit, and a rectifier (ac�dc) circuit. The inverter

A switching frequency multiplier inverter for low inductance machines that uses parallel connection of switches and each switch is independently controlled according to a pulse width modulation scheme. The effective switching frequency is multiplied by the number of switches connected in parallel while each individual switch operates within its limit of switching frequency. This technique can also ...

, transportation systems, and etc., which requires a rectifier, a DC bus, and an inverter to obtain arbitrary AC parts, i.e., a virtual front-end AC/DC rectifier and a virtual DC/AC inverter, and synthesizes the switching state of the matrix converter from the both switching states of the virtual rectifier

Conventional methods for calculating electricity losses in pipe-type cable systems rely heavily on data measured in lower-voltage systems in the 1950s. With the new technique developed in this study, engineers can compute power losses more precisely for cables of various configurations and voltage ratings.

The activity reported herin is the proposed system study to examine the dynamic relationship of integrated ac/dc systems wherein the existence of direct current circuit breakers is postulated. (ERA citation 05:033608)

. However, reducing the CMV via PWM pulse pattern typically degrades the other modular performance supply AC-DC-AC power converter units. Pulse Width Modulation (PWM) is the standard approach to operate controlling the PWM pulse patterns is the most economical method as it requires no extra components and cost

The ac-dc pulse power conversion equipment for the Joint European Torus is described; the 1-GW pulse power rating of the conversion equipment is made possible by a flywheel-motor-generator set for the poloidal field load. A power of 500 MW is supplied by a 400-kV interconnected network of large generating capacity. The step-down and ...

leg regulates the voltages on their capacitors independently of the others. Main Features #12;AC/DC/AC C: value of the DC-link capacitors Voltage Oscillation Amplitude #12;AC/DC/AC Converters: TwoAC/DC/AC Converters: Two-Level and Multilevel VSI Page 1 Socrates � Erasmus Visit AC/DC/AC

The use of high power converters has increased tremendously. Increased demand for transportation, housing and industrial needs means that more number of power converters interact with the utility power grid. These converters are non-linear and they draw harmonic currents, significantly affecting power quality. To ...

High voltage direct current (HVdc) transmission controllers may not be optimized for different operating conditions because they exhibit a fixed gain structure. A feasible alternative proposed to overcome this limitation in the use of an adaptive regulator structure. This paper describes the development of a self-tuning current regulator applied to the rectifier station of an ...

... Title : WIRELESS POWER TRANSMISSION. ... Abstract : A popularized article on the transmission of power by wireless means is presented. ...

... OF SUBMARINE POWER TRANSMISSIONS This report is the summary of the evaluation of transmission systems for steam- powered submarines. ...

... Extension of the NIST AC-DC Difference ... The NIST primary standards of ac-dc difference for current are multijunction thermal converters (MJTCs). ...

The $1 million ac-dc system operation laboratory of Edison Electric Institute on the campus of the University of Pennsylvania is described.

Adding an HVDC transmission line to an existing right-of-way with an HVAC line can increase power transfer for a given right-of-way width. However, interaction between the two line types can change some electrical effects unless a critical distance is exceeded. Researchers conducted full-scale, two-phase tests using an HVAC test span paralleled by a ...

A study comparing the results of a digital computer program and an hvdc simulator is reported. The digital computer program permits the study of combined ac-dc systems, and provides a complete representation of one or more hvdc transmission systems in a large scale interconnected ac system. The hvdc simulator is a model of the dc system and the surrounding ...

For a parallel ac--dc power system, the effect of a controlled dc link on system stability and damping depends on the system operating conditions. Thus, a controller which improves stability at one operating condition may have a detrimental effect at other system operating conditions. Further, when the machine power angle to the ac ...

This paper addresses the design of efficient switched-capacitor power converters. The discussion starts with a review of the fundamental limitation of switched-capacitor circuits which shows that the topology of such circuits and the ``forced`` step changes of capacitor voltages are the inherent attributes of power loss. Although the argument follows from ...

Time quantity one-cycle control method is proposed in this paper for unity power-factor ac-dc converters. Converters controlled by this method operate at constant switching frequency, require no current sensing, have a simple control circuit, and exhibit resistive input impedance at the ac side. Feedback loop design method is provided to minimize the ...

converter after the micro-power- generators. The AC/DC converter is followed by an adaptive DC/DC converter generator is rectified using an AC/DC converter. Then a DC/DC converter is used to match the output of AC/DC-LINEAR TECHNIQUES FOR INCREASING HARVESTING ENERGY Power Generator AC/DC Converter DC/DC Converter Micro Battery

Harmonic analysis based on Kirchhoff laws requires the knowledge of the spectral information of the injected currents. In practical operation of controlled converters, these current harmonics depend on the actual operating point given by the emf and the dc mean current according to the requirements of the dc load. This specification means a more difficult predetermination in the case of a rippled ...

It is concluded that the two most likely long-range candidates for converting dc to ac power from batteries and fuel cells are the basic current-fed line commutated inverter (a derivative of HVDC technology), and the voltaged-fed conduction angle controlled force commutated inverter. Results are presented for analyses of cost, performance, and reliability which lead to the ...

Increasing demand for low power consumption in electronics combined with continued miniaturization of electronic device components in today's analogue/digital circuits have reduced the supply voltage to sub-one volt levels. The supply voltage to integrated circuit devices are provided by AC-DC converters, which converts high frequency ac voltage to a conditioned dc output ...

... Title : Power Transmission Device. ... Abstract : A power transmission device for transmitting electric power optically to remote locations. ...

... to a hydraulic power transmitting system ... a hydraulic transmission are presented. ... Descriptors : *HELICOPTERS, *TRANSMISSIONS(MECHANICAL ...

... and power transmission technologies are important. Descriptors : *SYMPOSIA, *HELICOPTERS, *HELICOPTER ENGINES, *TRANSMISSIONS( ...

This paper proposes a new harmonic current-free ac/dc power conversion system characterized by the integration of a small-rated series active filter with a large-rated double-series diode rectifier. The dc terminals of the active filter are directly connected in parallel with those of the diode rectifier, thereby forming a common dc bus. The active filter ...

Energy Research Corporation has developed a nickel-cadmium battery system that is being evaluated for electric vehicle propulsion applications. The battery system design features include; air circulation through gaps between cells for thermal management, a metal-gas coulometric fuel gauge for state-of-charge and charge control, and a modified constant current AC/DC ...

Furnas Centrais Eletricas SA, Brazil's regional state power company, is presently, planning to award a turnkey contract or contracts for the engineering, manufacturing, and installations of 4 bipolar ac/dc converter stations expected to cost between $700 million and $1 billion. Two stations would be located at the Itaipu hydro project and the ...

... Title : Geared Power Transmission Technology,. ... Descriptors : *Transmission gears, *Transmissions(Mechanical), *Helicopter engines ...

... OF SUBMARINE POWER TRANSMISSIONS, APPENDIX 11. ... The evaluation of transmission systems for ... types of fluid transmissions, all information ...

Quasi-resonant converters are a family of single-switch resonant dc-dc converters featuring zero-current or zero-voltage switching. The topological structure uniting these resonant converters - and the rectangular-wave (PWM) converters on which they are based - leads to general models of their dc and low-frequency ac behavior. An expression is derived that yields the dc conversion ratio of a ...

Using electromatic field theory, a new method is developed for calculating alternating current in power cables installed in pipes of carbon steel (magnetic pipes). The technique for evaluating these losses is based on the method of images which replaces complicated distribution of currents in the system with a sequence of thin conductors. The method not only gives a ...

wireless power transmission and off-board space propulsion, but safety ... Lasers are now being considered for wireless power transmission, ...

During the spring of 1991, several severe geomagnetic disturbances were recorded in North America, and particularly in Northern Quebec, where Hydro-Quebec's La Grande generation complex and transmission system are located. As a result of these disturbances, the Quebec-New England Phase 2 HVDC system was affected by transformer saturation and harmonic voltage ...