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Common-Mode Current Reduction PWM Technique Optimized for Four-Wire Inverter-Fed Motors

Two optimized PWM techniques for four-wire electric-drive systems (EDS) are proposed with low loss and largely reduced common-mode (CM) current. Based on the theoretical analysis, modifying the original space vector PWM (SVPWM) brings possibilities of reducing CM and neutral current at the same time. A hybrid phase shift PWM (HPSPWM) that takes advantages of the conventional three types of Active Zero State PWM (AZSPWM) is proposed for the first time and is able to reduce the CM and neutral current while maintaining the stable operation of the drive system. Moreover, applying Variable Switching Frequency PWM (VSFPWM) in addition to the HPSPWM drive system requires less computational effort for the microcontroller and results in lower equivalent switching frequency than the traditional SVPWM. By doing so, the peak of CM current can also be move to adjacent frequencies. All the analysis was validated experimentally and paves the path for future works.