Capacitor voltage balancing in dc link five-level full-bridge diode-clamped multilevel inverter

Abstract

The voltage balancing of dc capacitors is a great problem of all multilevel with several dc link. The chopper circuit in a five-level full-bridge diode-clamped multilevel inverter to overcome the unbalance charging of capacitor voltage has been studied in the present paper. The proposed chopper circuit requires additional inductors and control scheme, is very simple to implement and its different operation modes are described in the present paper. Simulation and experimental results are presented to verify the proposed chopper circuit for dc capacitor voltage balancing in the five-level full-bridge diode-clamped multilevel inverter and show that it can reduce a total harmonic distortion of output voltage and current.