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.

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