基于空间电压矢量120°解耦的开绕组异步电机双三电平逆变器零序电压消除

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Abstract Because of the drawbacks of the dual three-level inverter-fed open-end winding induction-motor drive,the whole system has the presence of high zero-sequence voltage.This configuration will produce the zero-sequence current with a single DC power supply that can stress the semiconductor switching devices and the motor.It can only achieve a dynamic eliminating average value instead of suppressing the instantaneous value of the zero-sequence voltage in dual inverters.In other words,it can only suppress the zero-sequence voltage by changing the effective time of short vectors and force the zero-sequence voltage in the individual inverters to a value of zero in each switching cycles in the average sense.In this paper,a novel zero-sequence voltage elimination method for the dual three-level inverter-fed open-end winding induction-motor drive has been proposed.It directly makes the reference voltage vector into two equal and mutually 120° equivalent reference vector by using the unified pulse width modulation and space-vector decoupling PWM strategy which produced by two inverters individually.It can achieve the elimination of instantaneous value of zero-sequence voltage in dual three-level inverter.Simulation and experimental results verified the correctness and validity of the proposed method.

Key words： Dual three-level inverter-fed open-end winding induction motor unified pulse width modulation zero-sequence voltage space-vector decoupling

Received: 29 August 2015 Published: 27 February 2017

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TM464

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	Geng Yiwen
	Xu Jiabin
	Wang Liang
	Li Xiaoqiang

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Geng Yiwen,Xu Jiabin,Wang Liang等. Elimination of Zero-Sequence Voltage in Dual Three-level Inverter Fed Open-End Winding Induction Motor Based on 120° Decoupled Space-Vector PWM Strategy[J]. Transactions of China Electrotechnical Society, 2017, 32(3): 184-193.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I3/184

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