MODIFIED CASCADED MULTILEVEL INVERTER WITH GA TO REDUCE LINE TO LINE VOLTAGE THD

The major problems associated with multilevel inverters are the harmonic content present at the output of the inverter and the requirements of large number of switches, which will increase the switching losses, thereby reduce the efficiency and overall cost of the inverter is increased. In this paper, an H-bridge inverter topology with reduced switch count technique is introduced. This technique reduces the number of controlled switches used in conventional multilevel inverter. To establish a single phase system, the proposed multilevel inverter requires one H-bridge and a multi conversion cell. A multi conversion cell consists of three equal voltage sources with three controlled switches and three diodes. This paper is based on 7-level inverter and the line voltage THD minimization can be achieved by using Genetic Algorithm (GA) optimization technique.