Different Control Strategies for Unified Power Quality Conditioner – A Review

Abstract: Power quality has become an important factor in power systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. To mitigate power quality problems, we have various equipments like active filter, passive filter, unified power flow controller and unified power quality conditioner etc. Among from them unified power quality conditioner was widely studied by many researchers as an eventual method to Improve power quality of electrical distribution System. To obtain the proper operation from UPQC, we need to control power filters of UPQC. To control them, there are different topology has been introduce. In this paper; several techniques a r e discussed and compared in terms of performance a n d implementation.

Keywords: Power quality, series and shunt active filter, unified power quality conditioner, control strategies, voltage control and current control.