A Shaft Generator System without Output Voltage Distortion

Electrical Engineering Japan

Tatsuta

2013

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SUMMARYA 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.

Section: Discussion Of Steady-state Characteristicsmentioning

confidence: 99%

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

Electrical Engineering Japan

Tatsuta

2013

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“…The receiving-end duplex reactor can eliminate the receiving-end grid output voltage distortion [3]. Here, let us discuss the effect of the sending-end duplex reactor.…”

Section: Effect Of the Sending-end Duplex Reactormentioning

confidence: 99%

“…Moreover, this system requires only one inverter to operate many wind turbine generators simultaneously. Furthermore, it can generate high quality electrical power without distortion [3]. These features of the system are advantages for large-scale wind farms.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the synchronous compensator connected to the receiving-end grid provides reactive power for the grid and for commutation of the inverter thyristors. Then, receivingend grid output voltage harmonics can be eliminated with the duplex reactor [3]. The power compensating system proposed in this paper consists of a synchronous generator and a duplex reactor.…”

Section: Introductionmentioning

confidence: 99%

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Steady-State Performance Analysis of an Integrated Wind Turbine Generating System in a DC Transmission System with Power Compensation System

Yamashita

Journal of international Conference on Electrical Machines and

2012

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-An electric power compensation system for a DC transmission system with an integrated wind turbine generator is proposed. The proposed compensation system consists of a synchronous generator and a duplex reactor. This apparatus is connected to the sendingend circuit of the DC transmission system. A set of steady-state equations of the system is first derived. Then, the effect of the duplex reactor, which can eliminate the sending-end grid current distortion due to commutation of the converter, is explored. The relationships among power at the sending-end circuit are also revealed. It is shown that fluctuations in the sending-end grid power due to changes in wind velocities are compensated with the proposed system. Finally, the effects of the sending-end grid conditions on the steady-state characteristics of the system are studied.

“…This system consists of power compensation systems which have synchronous machines and duplex reactors with which harmonic components of the sending-end and receiving-end grid currents can be eliminated [3], a sending-end thyristor converter, wind turbine generating systems connected in series to a DC transmission line through each thyristor converter, a current-source thyristor inverter, and transformers. The power compensation system is connected to the sending-end grid through the transformer to compensate fluctuations in the sending-end grid power and receiving-end grid power due to changes in wind power [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Considerations of kVA capacity of power compensation systems for DC transmission system including wind turbine generating systems

Yamashita

2011 International Conference on Electrical Machines and Systems

2011

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An integrated wind turbine generating system in a DC transmission system with power compensation systems has been proposed and its steady-state performances have been analyzed. In this paper, the kVA capacity of the power compensation systems connected to the sending-end and the receiving-end grids and wind turbine generators is discussed. A set of system equations is first derived. The effects of the sendingend grid conditions on the kVA capacity of the power compensation systems are explored. It is shown that, although the effect of the sending-end grid power factor on the kVA capacity of the sending-end compensation system is small, the effect of the power factor on the kVA capacity of the receivingend compensation system is large. The appropriate turns ratios of the transformers are also studied. Finally, the kVA capacity of the wind turbine generators is discussed. II. DERIVATION OF STEADY-STATE EQUATIONSHere, the equations needed to discuss the kVA capacity of the system are developed. Fig. 2 shows an equivalent circuit