Common Mode Voltage Reduction in Four-Leg Inverter with Multicarrier PWM Scheme

Three-phase three-leg inverter has an inherent common mode voltage (CMV) problem. Therefore, three-phase four-leg inverter is presented to mitigate the CMV of the inverter. This study discusses the characteristics of multicarrier pulse width modulation (PWM) for three-phase four-leg inverter. The multicarrier PWM scheme is utilized to reduce the CMV of the inverter. The analysis of sinusoidal PWM and space vector PWM with multicarrier is discussed. The experimental results are utilized to validate the performances of the proposed multicarrier PWM scheme.