REDUCED NUMBER OF SWITCHES FOR SEVEN LEVEL INVERTER

Multilevel inverters hold attractive features, which make them to be utilized in wide range of applications. But with increase in number of output levels, the number of semiconductor switches in the respective configurations increase which may lead to vast size and hikes the installation cost of the inverter. Here the project presents effective configurations for seven level inverter. A configuration is built with single DC voltage source with a series of capacitors, diodes, seven active switches including a H-bridge for generation of seven level output. Other configurations are built with three dc voltagge sources, six active switches and four dc voltage sourc es, five active switches. Multi carrier based Pulse Widt h Modulation technique is used for the switching of gate trigger circuitry. Computer aided simulation is done to validate the considered approach using MATLAB/SIM ULINK. The performance quality in terms of Total Harm onic Distortion of the considered multilevel inverter structures are compared with each other to obtain the effective topology for seven level output