The P,Q controllable domain of a single phase PWM converter to preserve sinusoidal AC current waveform

The P,Q controllable domain for any single phase utility-interactive voltage-source pulse width modulation (PWM) converter to preserve the AC current waveform sinusoidally, is derived mathematically to form an ellipse determined by its mains circuit parameters, independently of the PWM types. The elliptical domain was examined by and verified from both digital simulation and experiment.