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JPE, Vol. 17, No. 1, January 2017
A New Method for Elimination of Zero-Sequence Voltage in Dual Three-Level Inverter Fed Open-End Winding Induction Motors
Yi-Wen Geng, Chen-Xi Wei, Rui-Cheng Chen, Liang Wang, Jia-Bin Xu, and Shuang-Cheng Hao
Area High Power Converters
Abstract Due to the excessive zero-sequence voltage in dual three-level inverter fed open-end winding induction motor systems, zerosequence circumfluence which is harmful to switching devices and insulation is then formed when operating in a single DC voltage source supplying mode. Traditionally, it is the mean value instead of instantaneous value of the zero-sequence voltage that is eliminated, through adjusting the durations of the operating vectors. A new strategy is proposed for zero-sequence voltage elimination, which utilizes unified voltage modulation and a decoupled SVPWM strategy to achieve two same-sized equivalent vectors for an angle of 120, generated by two inverters independently. Both simulation and experimental results have verified its efficiency in the instantaneous value elimination of zero-sequence voltage.
Keyword Dual three-level inverter-fed open-end winding induction motor,Space-vector decoupling PWM,Unified pulse width modulation,Zero-sequence voltage
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