减小异步电机共模电压的SVPWM控制方法的分析

Analysis of SVPWM Control Methods for the Commom-mode Voltage Reduction of the Induction Motor Drive

共模电压会带来共模电流、EMI、电压谐波等问题,因此一些PWM控制方法被用来减小共模电压。本文对一类改进的SVPWM控制方法进行了详细分析,提出尽管该类方法可以有效地减小电压源逆变器供电的异步电机驱动系统的共模电压,但也会造成功率器件的同时动作,从而引发电动机线电压的双极性调制和转矩脉动。仿真结果证明了上述结论的正确性。

To reduce the common-mode current. EM1 and harmonic, novel space vector PWM (SVPWM) control methods are proposed in literatures. The conclusion is obtained that although these methods reduce the common-mode voltage, but they result in the devices' simultaneous switching, the bi-polarity modulation and torque ripple. The validity of above conclusion is verified by the simulation results.