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JPE, Vol. 17, No. 2, March 2017
Switching Functions Model of a Three-phase Voltage Source Converter (VSC)
Seyed Mahdi Fazeli, Hew Wooi Ping, Nasrudin Bin Abd Rahim, and Boon Teck Ooi
Area Analysis, Modeling and Control
Abstract The equivalent circuit of a three-leg, four-wire voltage source converter (VSC) is derived using switching functions. Simulations and experiments are conducted (i) to investigate the effects of the zero sequence on VSCs when a three-phase imbalance exists and (ii) to use the consistency of simulations and laboratory experiments to validate the equivalent circuit. The impact of a three-phase imbalance on the VSC has yet to be fully investigated because of the lack of an equivalent circuit to show rigorously how the zero sequence currents flow through the VSC.
Keyword Four-Wire Three-phase system,Switching function,Voltage source converter,Zero sequence
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