Simulation of Single Phase Cascaded H-Bridge Multilevel Inverters & THD Analysis

This paper imparts an outline on numerous multi-level H-Bridge topologies and discusses their appropriateness in single-phase systems. The Alternating voltage with structure of staircase waveform can be generated from various levels of voltages in Multilevel Inverter. This is similar to sinusoidal waveform with low harmonic distortion. This type of Multilevel Inverters reduces filter requirements. The need of several sources on the DC side of the converter makes multilevel technology promising for renewable energy applications. Several industries and Power sector are using Cascaded H-bridge for modern technical development. It has sever-al benefits over two-level inverter so they are preferred in renewable energy applications. This paper presents the study of three level, five level and seven level cascaded H-bridge inverter in single phase system. Power quality issue of harmonics is discussed for each lev-el. Simulation has been done for various levels of voltages acquiring control signals by with Phase disposition technique. Matlab is used to simulate all three configuration and their results are compared.