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A SINEWAVE INTERFACE FOR VARIABLE-SPEED WIND TURBINES
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| Author(s) |
G. A. Smith; R. G. Stephens; P. Marshall; M. Kansara |
| Abstract |
There are a number of major benefits from operating wind turbines at variable-speed including improved energy capture, reduced mechanical stress and lower levels of audible noise in light winds. A number of variable-speed systems have been operated with varying degrees of success. These include ac-dc-ac link inverters for synchronous or capacitor excited asynchronous generators and also slip-recovery schemes with cycloconverters. The latter has the disadvantage of slip-rings whilst the former recover energy through Line Commutated Inverters (LCI's) with variable power factor and poor current waveform. The IGBT may be used to provide a power interface that can synthesise good quality current waveforms in both generator and the power network. In this solution a generator side step-up converter produces a constant dc link voltage from the variable frequency and voltage generator. This is then inverted through a high-frequency interface to produce near sinusoidal current at unity power factor. Results show overall efficiencies around 90% with total harmonic distortion as a % of fundamental not exceeding 10%. |
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| Filesize: | 2.944 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-21 by System |
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