改进式SHEPWM对三电平变频器系统的共模电压和轴电压的抑制作用

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Abstract The common-mode voltage (CMV) & shaft voltage of induction motor driven by inverter can cause great damage to motor stator insulation, bearing and cause EMI problem. An improved selective harmonics elimination pulse width modulation (SHEPWM) is applied in this paper to eliminate the low order components of the inverter CM voltage. And the high components of the CM voltage are attenuated by a well-designed CM filter. A satisfactory result of CM voltage & shaft voltage is obtained. A comparison of experimental results under the following three conditions: with and without CM filtering and when the motor is fed by AC power network, are made in detail. The comparative analysis not only explains a certain particular phenomenon of motor CMV, but also verifies the validity of the scheme proposed in this paper.

Key words： Shaft voltage common mode filter SHEPWM three-level NPC inverter

Received: 21 March 2008 Published: 14 February 2014

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TM464

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	Zhong Yulin
	Zhao Zhengming

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Zhong Yulin,Zhao Zhengming. Common Mode Voltage and Shaft Voltage Suppression on a Three-Level NPC Inverter System Applying Improved SHEPWM[J]. Transactions of China Electrotechnical Society, 2009, 24(6): 48-55.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I6/48

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