Review of reduce component count in nine level inverter employed single bi- directional switching for transformer

Abstract

Multilevel inverters have created a new wave of interest in industry and research. While the novel topologies have proved to be a viable alternative in a wide range of high-power medium-voltage applications, there has been an active interest in the evolution of newer topologies. Reduction in overall part count as compared to the classical topologies has been an important objective in the recently introduced topologies. In this paper, the proposed multilevel inverter topologies with reduced power switch count are analyzed. A novel cascaded transformer multilevel inverter is proposed. The number of the switching devices is reduced in the proposed topology. This topology comprises of a DC source, several single phase low-frequency transformers, two main power switches and some bidirectional switching devices. In this topology, only one bidirectional switch is employed for each transformer.