一种基于电流空间矢量的新型死区补偿策略

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Abstract In three-phase voltage source inverter (VSI),the gate signal of the two switching devices in one bridge arm is complementary. To avoid short circuit of the two switching devices in one inverter leg,a small lag called dead time is inserted into PWM gate signal. Dead time in VSI brings dead time effect such as inverter output voltage and current deviation,torque pulsation and current clamp,which reduces system performance,so it is necessary to compensate dead time. In this paper,the dead time effect of the three -phase bridge inverter is analyzed,an optimal dead-time compensation method based on pulse is implemented,and the current polarity judgment based on current space vector is introduced. In order to solve current phase shift problem using traditional filter,a novel filter is designed to filter harmonic components to improve accuracy of current polarity judgment. Vector control simulation and experiment of induction motor with the novel dead time compensation strategy shows that it improves the dead time effect efficiently.

Key words： Three-phase inverter current space vector dead time compensation novel filter

Received: 14 December 2011 Published: 11 December 2013

PACS:

TM301.2

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	Articles by authors
	Zhang Ji
	Peng Yanqing
	Chen Tianxiang

Cite this article:

Zhang Ji,Peng Yanqing,Chen Tianxiang. A Novel Dead Time Compensation Strategy Based on Current Space Vector[J]. Transactions of China Electrotechnical Society, 2013, 28(7): 127-132.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I7/127

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