Capacitor voltage balancing of a new five-level hybrid-clamped inverter

In this paper, a new five-level hybrid-clamped inverter topology is introduced; this topology adopts a flying capacitor based active-clamped structure. Currents through dc-link neutral points and flying capacitor are studied; decoupling control for capacitor voltages is discussed. A voltage balancing algorithm based on redundant switching combination selection is proposed, the implementation of the algorithm adopts a self-adapting approach simply using PI regulators. Some simulation results are presented to validate the algorithm.