Mitigating Common-Mode Voltage in Two-Level Inverter-Driven Three-Phase Induction Motors: An Analysis of Active Zero Switching Pulse Width Modulation Techniques and their Impacts

Abstract

This dissertation investigates the mitigation of common mode voltage (CMV) in two-level inverters feeding three-phase induction motors. CMV is a critical issue in power electronics, leading to problems such as motor bearing failure and electromagnetic interference. This study evaluates three Active Zero Switch Pulse Width Modulation (AZSPWM) techniques for the reduction of CMV (AZSPWM1, AZSPWM2, AZSPWM3) and compares their performance against Space Vector Modulation (SVM). Three parameters were used to analyse the mitigation methods performance including CMV levels, Total Harmonic Distortion (THD), and Torque Ripple. Simulation results highlight the effectiveness of AZSPWM strategies in minimising CMV while maintaining desirable inverter performance. This research contributes to the optimisation of inverter control strategies, offering insights for improving the reliability and efficiency of electric motor drives.