812 Pulse WlDth Modulation

Pulse width modulation techniques are used to mitigate the adverse effects of harmonics in the inverter.1,2 Harmonics in the output PWM voltage are not eliminated but are shifted to a much higher frequency, making filtering a lot easier. Controllability of the amplitude of the fundamental output voltage is another advantage of PWM. Several PWM techniques have been developed over the years, such as sinusoidal PWM, uniform sampling PWM, selective harmonic elimination PWM, space vector PWM, random PWM, etc. The two commonly used PWM techniques, the sinusoidal PWM and the space vector PWM, are discussed in the following.

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