A Carrier-Rotation Strategy for Voltage Balancing of Flying Capacitors in Flying Capacitor Multi-level Inverter

플라잉 커패시터 멀티-레벨 인버터의 플라잉 커패시터 전압 균형을 위한 캐리어 로테이션 기법

This paper proposes a Carrier-Rotation PWM technique that is new solution for the voltage unbalancing problem of flying capacitors in the Flying Capacitor Multi-level Inverter (FCMI).The proposed PWM technique equalizes the utilization of phase leg voltage redundancies corresponding to the charging and the discharging state of flying capacitors during one switching period of all the switches. it also has the same switch utilization and the reduced harmonics of output voltage. Hence, it is more suitable for the FCMI compared with the conventional solutions. Experimental results on the laboratory prototype flying capacitor 3-level inverter confirm the validity of the proposed PWM technique.