基于电流闭环和死区补偿的变频驱动调速系统低频振荡抑制

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Abstract The system of induction motor fed by inverter has the phenomenon of unstable operation at low speed,and the over current which is caused by low-frequency oscillation can lead to happen protection of the system,and even burn up the machine,which is harmful to the drive machine with long time operation at low frequency. The small disturbance mathematical model of induction motor and inverter is built in this paper,and the unstable area of the system is drawn by using the method of root-locus criterion. Several dead-time compensated method are analyzed,and the restrain method based on current close-loop and dead-time compensated is put forward. The current close-loop is used to restrain the ripple of stator current,making it stable to the current of operation frequency,dead-time compensated is used to counteract the effects of dead-time toward to the system’s stability. Simulation results and experimental results indicate that the proposed method has good performances of restraining the low-frequency oscillation of induction motor fed by inverter,and the stability and speed control of the system are improved.

Key words： Induction motor fed by inverter low-frequency oscillation current close-loop dead-time compensation stability

Received: 10 September 2013 Published: 22 January 2015

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TM352

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	Qiao Mingzhong
	Xia Yihui
	Zhu Peng
	Liang Jinghui
	Zeng Haiyan

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Qiao Mingzhong,Xia Yihui,Zhu Peng等. Low-Frequency Oscillation Restrain Method of Induction Motor Fed by Inverter Based on Current Close-Loop and Dead-Time Compensation[J]. Transactions of China Electrotechnical Society, 2014, 29(11): 126-133.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I11/126

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