Mitigation of Harmonics in Multilevel Inverter Using IGBT as a Switch

Multilevel inverter is one of the most recent and popular type of advances in power electronics. It synthesizes desired output voltage waveform from several dc sources used as input for the multilevel inverter. This present paper deals with study and analysis of three phase multilevel inverter and their different topologies and configurations. The main purpose of our study is to study the modulation techniques and compare them with each other analyzing their advantages and disadvantages. In our paper the cascaded H bridge multilevel inverter is structure. The term multilevel converter is utilized to refer to a power electronic circuit that could operate in an inverter or rectifier mode. One first impression of multilevel power converter is that the large no of switches may lead to complex pulse-width modulation (PWM) switching algorithm. However early developments in this area demonstrated the relatively straight forward nature of multilevel PWM. Our project presents the fundamental voltage source and current-regulated method. In this paper third, fifth and seventh level harmonic is analysed. Simulation work is done using the MATLAB software which validates the proposed method and finally THD comparison is presented for analysis.