A three phase cascaded multilevel inverter operated with switching frequency optimal technique

Abstract

Inverters have a wide range of applications in industries. Reduced switch topologies are current trend in multilevel inverters with reduced switching losses and improved total harmonic distortions. In this paper a new three phase multilevel inverter topology is proposed. The basic unit of proposed inverter in each phase generates a five level output under symmetric configuration and seven level output under asymmetrical configuration with 1:2 source ratio. The proposed inverter is modular in structure and a generalized circuit for n-levels is presented in this paper. The simulation of the proposed inverter is performed in MAT LAB/SI MULINK. The simulation results with symmetrical and asymmetrical configurations using single module and two modules is presented to validate the operation and modularity of the circuit.