Abstract:
In medium voltage high power application of voltage
source inverter (VSI), low switching frequency pulse width
modulation (LSPWM) techniques offer better efficiency and
better thermal management as the switching loss decreases
drastically. The number of switching transitions are very limited,
hence getting a good quality output waveform is a drawback
in LSFPWM. To overcome this problem, selective harmonics
elimination (SHE) PWM techniques are used to eliminate any
desired harmonics from the output waveform by turning ON and
OFF of semiconductor switches at predefined time. However, the
main challenge in its implementation is to compute the exact
instant of time to turn ON the switches. In this paper a Genetic
Algorithm based Optimization technique is presented to compute
the switching angles in bipolar waveform. The simulation and
hardware results are given to verify the robustness of the
algorithm.
