Hybrid-GA based multiple solutions for Selective Harmonic Elimination in Bipolar PWM waveforms

The abolishment of principal low-order dominant harmonics through Selective Harmonic Elimination (SHE-PWM) approach is restricted by the total switching pulses allowed in a quarter of the inverter fundamental-cycle due to constraints imposed on the high-power inverter device switching loss. The paper evaluates and analyzes multiple solution sets pertaining to bipolar waveform pattern for angles of switching N=2 and switching frequency equal to five times the fundamental switching frequency i.e. pulse-number (P=5). The performances of each solution set are examined considering the most significant non-triplen 5
^th
harmonic order voltage and also overall weighted harmonic distortion (V
_WTHD
) in line voltage three-phase waveform patterns. A combination of Genetic algorithm (GA) and Newton Raphson (N-R) hybrid method is adopted to derive the optimum switching-angle sets of distinct solution for modulation-index (M) range 0 <; M <; 1. Finally, the obtained simulation results using MATLAB/Simulink package clearly supports and confirms the analytical outcomes.