Generalized UPQC System With An Improved Control Method Using PV Array For Reduction Of Harmonics

Power quality has become an important factor in power systems, for consumer and household appliances with proliferation of various electric and electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. A technique of achieving both active current distortion compensation, power factor correction and also mitigating the supply-voltage variation of the load side, is compensated by unique device of UPQC. In this paper UPQC with the photovoltaic system is presented. The proposed system consists of a series inverter, a shunt inverter, and a photovoltaic array connected in the DC link through the boost converter. This paper presents a modified synchronous-reference frame (SRF) -based control method to Shunt active filter and instantaneous PQ (IPQ) theory based control technique for series active filtering to compensate power-quality (PQ) problems through a three-phase four-wire unified PQ conditioner (UPQC). The proposed system can improve the power quality at the Point of Common Coupling (PCC) on power distribution systems. The performance of the proposed system was analyzed using MATLAB/SIMULINK.