Different multilevel inverter topologies with reduced number of devices

Abstract

Multilevel Inverters are nowadays becoming the state-of-the-art power electronic devices for high-power and power-quality seeking applications. While the classical topologies have proved to be a viable alternative, there has been an active interest in the evolution of newer topologies. Reduction in overall part count as compared to the conventional topologies has been an important objective in the recently introduced topologies. In this paper, some of the recently proposed multilevel inverter topologies with reduced power switches are reviewed. Level Shifted triangular multicarrier waves are compared with the sinusoidal reference to generate sine PWM switching sequence. Based on a detailed comparison of the different topologies as presented in this paper, appropriate multilevel solution can be arrived at for a given application.