Modified SVPWM to eliminate common-mode voltages for five-level ANPC inverters

Abstract

In this paper, a novel common-mode voltage (CMV) elimination scheme is proposed for five-level active neutral-point clamped (5L-ANPC) inverters, which is based on the space vector PWM (SVPWM). The proposed SVPWM scheme utilizes only 19 voltage vectors producing a zero value of CMV among the whole 125 voltage vectors of the 5L-ANPC inverter. This scheme is also able to control all capacitor voltages by selecting redundant switching states of the inverter appropriately. Therefore, the inverter can be supplied by a single DC source such as a simple diode rectifier. The validity of the proposed SVPWM scheme is verified by simulation results.