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Harmonic minimization using PSO technique for CMLI with unequal and equal DC sources

Cascaded Multilevel Inverter (CMLI) is widely used in high power and high voltage applications in electric utility and industrial drives. The quality of output voltage waveform is an important consideration when directly feeding such drives and therefore its Total Harmonic Distortion (THD) becomes a significant parameter. In this article, the output voltage THD of the inverter has been minimized for both symmetrical and asymmetrical configurations using Particle Swarm Optimization (PSO) technique. The proposed approach is an evolutionary and simple robust stochastic search algorithm which overcomes the limitations of Resultant Theory and Newton Raphson method. In this paper, simulation results for 11-level and 13-level CMLI have been presented. These results show that the proposed PSO method is capable of mitigating the harmonic content to as low as 3.87 percent for 13-level CMLI and 4.43 percent for 11-level CMLI. The results have been verified using MATLAB/SIMULINK and harmonic spectrum analyzed using Fast Fourier Transform window.