Simulation of Single Phase Seven Level Cascade H-Bridge Multilevel Inverter & Modeling of Switching and Conduction Losses

Abstract

— Multilevel power electronic converter has wide range of applications. In multilevel power electronic converters the output can be synthesized by combining several DC voltage sources. Cascade H-Bridge multilevel inverter generally requires more number of DC sources. An alternative option is to replace all the DC sources feeding H-Bridge cells with capacitors, leaving only one H-Bridge cell with a real DC sources. This paper presents a multilevel inverter model working in H-bridge topology. The multilevel model comprises of several H-bridge models consisting of MOSFET/IGBT that are cascaded to get desired number of levels. The inverter is fed from existing AC supply which is rectified and fed to inverter.The inverter has been controlled using selective harmonic elimination in which the switching angles were determined using the particle swarm optimization Algorithm (PSO). The PSO is a relatively new and powerful intelligent evolution algorithm for solving optimization problems. It is a population-based approach.Simulation studies are carried out in MATLAB/SIMULINK and the performance parameters of the proposed inverter are computed.