Direct Power Control of Three-Phase PWM Rectifier using Space- Vector Modulation (DPC- SVM)

Abstract

This work provides a control strategy for PWM rectifiers using space vector modulation technique by keeping the switching frequency as constant. Instead of using line currents as control variables here instantaneous active and reactive power are used as signals for modulation of PWM rectifiers. In traditional control methods like VDPC and VFDPC, we are having line voltage estimator and virtual flux estimator. Here virtual flux estimator and line voltage estimator are replaced with Phase Locked Loop for better performance in distorted conditions at source side. The strategy of direct power control using space vector modulation is discussed theoretically. The steady state results are presented for the proposed DPC – SVM system. Compared to other control strategies the DPC-SVM have special features like constant switching frequency, unity power factor by providing distortion less sine wave as current under unbalanced conditions.