Elimination of Harmonics in a Multilevel Inverter Connected to DG Using the Hybrid PSOGA Algorithm

Distributed generation (DG) becomes more important day by day due to environmental condition so implementation of convertors that interfacing DC output of DG to AC main grid is inevitable. This paper presents an optimal solution for a selective harmonic elimination pulse width modulated (SHE-PWM) technique suitable for a high power inverter used in constant frequency utility applications. The two main objective of this study are the elimination of specified low order harmonics and achieve to appropriate value of first component of output voltage. This paper applies a hybrid PSOGA algorithm that combines operators of GA such as cross over and mutation with PSO algorithm to solve SHE equations, resulting in desired ac output waveform. It is shown that for a range of the modulation index the switching angles can be chosen to achieve minimum total harmonic distortion (THD). In the following, simulation results are presented for 9-level and 11-level MultiLevel Inverter (MLI).