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JPE, Vol. 17, No. 1, January 2017 
A New Method for Elimination of ZeroSequence Voltage in Dual ThreeLevel Inverter Fed OpenEnd Winding Induction Motors
YiWen Geng, ChenXi Wei, RuiCheng Chen, Liang Wang, JiaBin Xu, and ShuangCheng Hao

Area 
High Power Converters 
Abstract 
Due to the excessive zerosequence voltage in dual threelevel inverter fed openend 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 zerosequence voltage that is eliminated, through adjusting the durations of the operating vectors. A new strategy is proposed for zerosequence voltage elimination, which utilizes unified voltage modulation and a decoupled SVPWM strategy to achieve two samesized equivalent vectors for an angle of 120¡Æ, generated by two inverters independently. Both simulation and experimental results have verified its efficiency in the instantaneous value elimination of zerosequence voltage.

Keyword 
Dual threelevel inverterfed openend winding induction motor,Spacevector decoupling PWM,Unified pulse width modulation,Zerosequence voltage 
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