Three-Phase Four-Switch PFC and Its Analytical Model

This paper presents a three-phase four-switch converter aimed at compensating reactive power in case of distorted and unbalanced source voltages. A space-vector PWM scheme is adopted to reduce the switching state of power switches. In the proposed control scheme, proper voltage vectors are generated on the ac terminal for drawing nearly sinusoidal line currents with unity power factor. An original closed-form solution of line currents, based on the mixed p-z approach is presented. The analytical and experimental results are provided to verify the effectiveness of the proposed control scheme.