Harmonic Elimination Using PSO and GWO in Cascaded H-Bridge Multilevel Inverter

Multilevel inverters are becoming more popular in industrial applications for high power and voltage ranges [6], [7]. Harmonics is a vast issue in the Multilevel Inverter. By applying the Selective Harmonic Elimination (SHE)-PWM technique and the best possible choice of switching angles, harmonics are eliminated, and the Total Harmonic Distortion is optimized and reduced (THD) [2]. Grey Wolf optimizer (GWO) algorithm is used to find the best switching angles for a Cascaded H-Bridge Multilevel Inverter (CHMLI), which wm allow some lower-order harmonics to be eliminated while still retaining the necessary fundamental voltage [8]. THD determines the output voltage quality. This report builds the five-level CHB-MLI and 7-level CHBMLI by implementing different algorithms. Here Particle Swarm optimization (PSO) algorithm and GWO are used. A GWO is compared with the practical values of PSO. By comparing both, GWO has less THD. A five-level and 7 verify the proposed system-level CHMLI; the work is done in MATLAB/Simulink.