Modified Phase-Shift PWM for Common-Mode Voltage Reduction in PMSM Drives Fed by Five-Level HANPC Inverter

This study proposes a modified phase-shift pulse width modulation (PS-PWM) technique for reducing common-mode voltage (CMV) in five-level hybrid active neutral-point-clamped (HANPC) inverters fed permanent magnet synchronous motor (PMSM). The proposed method is based on restricting the injection of a zero-sequence voltage at sections where CMV has its peak values. A comparison between the proposed modified PS-PWM and the conventional PS-PWM was conducted using simulation results obtained from PSIM software. The results indicated that the proposed modified PS-PWM technique led to a significant reduction of 50% in CMV compared to the conventional PS-PWM method. This study highlights the effectiveness of the proposed modified PS-PWM technique in reducing the CMV in five-level HANPC inverters fed PMSMs through the strategic injection of a zero-sequence voltage.