Abstract:
In this paper, Selective Harmonic Elimination (SHE) technique is utilized to reduce the dominant lower order frequencies present in the output voltage waveform of cascaded H-Bridge Multilevel Inverter (CHBMLI). Chaotic Gravitational Search Algorithm (CGSA) is applied to obtain the optimal switching angles, modulation index and input voltage values of seven level and eleven level cascaded multilevel inverter. The results obtained from various chaotic maps are compared with the already reported firefly and differential search algorithm based MLI for fixed input voltages and modulation index. From the simulation results, it is found that the Tent chaotic map (CGSA10) of CGSA provides better performance with minimum lower order harmonics and Total Harmonic Distortion (THD). The statistical performance analysis also confirms that the Tent chaotic map of CGSA provides consistent solutions with minimum standard deviation values as compared with other chaotic maps embedded in GSA.
