High Order Harmonics Elimination in Modified Single Phase 5-level Cascaded H-bridge Inverter Using HGA

Abstract

The main objective of this work is to improve the quality of voltage waveform generated by a modified multilevel inverter cascade topology using Selective Harmonic Elimination (SHEPWM) control strategy and also using LC filters. The SHEPWM method is used to eliminate harmonics of chosen lower-order while controlling the amplitude of fundamental harmonic in CHB multilevel inverter. LC filter is 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 level configuration for the new topology is presented in this work. The obtained simulation results are validated through experimental tests.