Switch reduction and performance analysis using different modulation technique in multilevel inverter

Abstract

Power converter is an important technology in industrial process, train traction and ship propulsion powered by different electric drive system. In this paper, sub-multilevel inverter is used to obtained multilevel waveform which uses reduced number of switches in comparison of other conventional multilevel inverter for same output levels. A comparison of THD produced in the output voltage generated using 7 level sub-multilevel inverter by employing two switching schemes i.e. nearest level control and selective harmonic elimination have been made. Simulation studies in MATLAB/SIMULINK environment have been carried out for 7 level sub-multilevel inverter. Based on simulation results, it is observed that THD in output voltage is less when selective harmoni elimination technique is employed as compared to nearest level control technique.