The main objective of this work is to improve the quality of voltage waveform generated by a modified cascaded H-bridge (CHB) multilevel inverter topology using selective harmonic elimination (SHE) control strategy and also using LC filters. This study presents a new topology of multilevel inverters that combines the conventional architecture of a cascade H-bridge inverter and LC filters. The SHE method is used to eliminate harmonics of chosen lower-order while controlling the amplitude of fundamental harmonic in CHB multilevel inverter. LC filters are added to the inverter in order to eliminate the high-order harmonics. Optimal switching angles are obtained by solving a non-linear equations system using hybrid genetic algorithm (HGA). 5 and 7 level configurations for the new topology are presented in this work. The obtained simulation results are validated through experimental results.

Keywords: Modified cascaded H-bridge (CHB) multilevel inverter, Selective harmonic elimination (SHE), Hybrid genetic algorithm, LC filter