Three-phase MLI with Reduced Number of Switches and Hybrid Optimized Switching

Abstract

In this paper, a hybrid pattern consisting of the optimal features of the SMA algorithm, and the GA algorithm are used to calculate the optimal switching angles for a three-phase multi-level inverter (MLI). These angles are used to remove a selected number of unwanted harmonics, thus reducing the total harmonics distortion (THD) to a significant value. The topology for the three-phase MLI is used to operate the least number of switches to increase the efficiency compared to the traditional three-phase inverter. A 23-level three-phase inverter is investigated and simulated in MATLAB Simulink environment using resistive, inductive, and non-linear loads. The results are presented for the voltages and currents of the inverter and the load, as well as the frequency spectrum analysis to compare the THD values for the two algorithms and the hybrid pattern.