مشخصات پژوهش

In this paper, minimization of total harmonic distortion (THD) is discussed for the output voltage of multilevel inverter. THD minimization is an efficient method in reduction of the harmonic components of the inverter’s output voltage. In multilevel inverters, the switching angles can be selected in a way that the output voltage THD will be minimized. Given that THD minimization is an optimization problem, intelligent algorithm is found to be an appropriate alternative in this regard. Shuffled Frog Leaping Algorithm and Harmony Search Algorithm are employed to find optimum switching angles to generate desired voltage value in the possible minimum THD. The obtained results of two algorithms are compared with each other to determine that which algorithm is more efficient in this regard. Also, both simulation and experimental results indicate superiority of this approach over the published work using GA in this concept. The experiments are conducted on a seven-level inverter to validate the feasibility of presented approach.