A New Hybrid Modulation Method with Low Current Distortion and Switching Losses for Single-Phase Three-Level Inverters

In order to get good performances for single-phase three-level inverters, this paper proposes a new hybrid modulation method to improve current distortion and switching losses simultaneously. The carrier-based dipolar modulation (CBDM) is extended to generate three PWM modes that can be easily created by adding specified zero voltages. The simulation results show that the current distortion at the low current can be improved and switching losses at the high current can be reduced by the proposed hybrid modulation method.