Low Common Mode Interference SVPWM Control for Dual Three Phase Permanent Magnet Synchronous Motor
Zhang Zhifeng1, Wu Xuesong1, Liu Xiaodong2
1. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China; 2. State Grid Liaoning Electric Power Co. Ltd Huludao Electric Power Supply Company Huludao 125000 China
Abstract：In order to reduce the common mode interference of dual three-phase permanent magnet synchronous motor (PMSM), a novel space vector pulse width modulation (SVPWM) control strategy is proposed in this paper. Firstly, in the motor driving system, the generation mechanism of the common mode voltage (CMV) is analyzed and discussed. Secondly, based on the voltage vector redundancy of the dual three-phase PMSM, for each sector, the voltage vector combination with lower CMV amplitude and smaller variation frequency is selected, which finally reduces the system common mode interference. Through theoretical analysis and physical experiment, the proposed control strategy can effectively reduce the amplitude of common mode voltage up to 1/6 of the DC bus voltage. Furthermore, the variation frequency of CMV is reduced to 2, so that the system common mode current can be decreased. In addition, from the experiment, it can be seen that there is no obvious increase in the stator current harmonic components when the motor is operating under middle or high-speed condition.
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2018, Vol. 33 
