SLIDING MODE CONTROL FOR POWER FACTOR IMPROVEMENT OF THREE-PHASE PWM RECTIFIER WITH LCL-FILTER

Abstract

The objective of this research is to develop a control strategy for a three-phase PWM rectifier with a LCL- filter 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 active RLC high-frequency harmonics filters and a sliding mode current control method that provides good tracking performance and robustness with respect to parameter variations including uses a PI controller to regulate the DC voltage. The simulation results showed that the LCL-filter connected to three-phase PWM rectifier with the balanced three-phase grid of Electricity at the voltage of 380 V at a frequency of 50 Hz with 700 V constant voltage supply as the same 3,553 W load. The harmonic distortion of current and voltage is averaged 2.50% and 0% respectively, with an average decrease of 29.39% and 4.63% respectively. Affecting to raise the power factor was equal to 1 and the harmonic current was in accordance with IEC1000-3-2 all requirements.