Different modulation methods have been proposed to control the multilevel inverters. This paper focuses on the staircase waveform modulation for 3-level inverters with low switching frequencies. In this paper a novel solution along with a new robustness optimization algorithm is presented to minimization of Total Harmonic Distortion (THD) of the output line voltage of the inverter based on the Multi Population Particle Swarm Optimization (MPPSO). The MPPSO algorithm has a lot of advantages compared with a general optimization algorithm such as Genetic algorithm (GA). A comparison has been drawn between aforementioned techniques related to optimization. A new expression of fitness function is presented to optimization of Line Voltage THD (LVTHD) of 3-level Inverter. The advantages of fundamental frequency harmonic minimization and swarm intelligence are combined to improve the quality of output line voltage. The validity of the proposed method is proved through various simulation results by MATLAB software.

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