Harmonics compensator by connecting sinusoidal voltage PWM converters

We propose a harmonics compensator for the utility line voltage distortion by connecting the sinusoidal voltage generated by the PWM converters to the AC line to be compensated point. This connecting point is adjustable by changing the feed back gain k. Adjusting the gain k, the capacity of the PWM converter and the suppression characteristics become controllable. This compensator can reduce or compensate the common utility line voltage distortion derived from the downstream utility source voltage harmonics and the upstream load current harmonics at the same time. In this paper, we describe the basic principle of the control method, the control system of the compensator constructed by the sinusoidal PWM converter. And then, we show some operating waveforms for both the case of the downstream voltage distortion and the upstream harmonics current from the nonlinear loads by simulation analysis to verify the feasibility.