电压型逆变器非线性的分析及补偿

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Abstract In order to improve the accuracy of the flux estimation in sensorless control system for induction motor, this paper analyzed the inverter nonlinear error caused by dead time and insulated gated bipolar transistor(IGBT) non-ideal characteristics. A conclusion is drawn that the rise or fall time of output voltage is inversely proportional to current value in IGBT turn-off process when bus voltage keeps constant. According to the experimental result, the relationship between duty cycle, switching frequency, phase current and voltage error is investigated. Based on the relationship, a new inverter nonlinearity compensation method is proposed. The compensation voltage changes with the current value, particularly at low current. Experiments show that the compensation method can inhibit disturbance caused by inverter nonlinear error, and estimate the magnitude and phase of rotor flux more accurately.

Key words： Voltage source inverter nonlinearity error voltage IGBT non-ideal characteristics flux estimation

Received: 06 March 2012 Published: 05 November 2014

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TM464

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	Articles by authors
	Chen Bin
	Wang Ting
	Lü Zhengyu
	Yao Wenxi

Cite this article:

Chen Bin,Wang Ting,Lü Zhengyu等. The Analysis and Compensation of Voltage Source Inverter Nonlinearity[J]. Transactions of China Electrotechnical Society, 2014, 29(6): 24-30.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I6/24

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