A CONTROL STRATEGY TO ACTIVELY DAMP OSCILLATION IN THE INPUT LC FILTER OF THREE-PHASE PWM RECTIFIER

Abstract

            The development of strategy on control actively damp oscillation in the input LC filter of a three-phase PWM rectifier circuit is to reduce current and voltage harmonic distortion and to improve the power factor correction nearly to unity power factor. This action is accomplished by using PWM technique and active RLC high-frequency harmonics filters and also controlling the switches in the circuit in order to tune input current follows nearly the referenced sine wave. The simulation results showed that after using active RLC filter in the three-phase PWM rectifier circuit at 700 V constant voltage supply as the same 3553 W load, The current and voltage harmonic distortion would be reduced to 31.15% and 4.39% differences respectively. Affecting to raise the power factor was equal to 1 and the harmonic current was in accordance with IEC1000-3-2 all requirements.