Three-phase voltage source inverters are widely used
in variable speed ac motor drives applications since
they provide variable voltage and variable frequency
output through pulse width modulation control.
Continuous improvement in terms of cost and high
switching frequency of power semiconductor devices
and development of machine control algorithm leads
to growing interest in more precise PWM techniques.
The most widely used PWM method is the
carrier-based sine-triangle PWM method due to
simple implementation in both analog and digital
realization.