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Keywords
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Shuffled Frog Leaping Algorithm (SFLA), Harmony Search Algorithm (HS),
Multilevel Inverter, Minimization of Total Harmonic Distortion, Phase Voltage
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Abstract
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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.
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