Minimization of Losses in Distribution Systems for the Improvement of Power Quality by Using UPFC

Minimization of line losses and the improvement of power quality in distribution system are the most challenging problems, particularly when it is not economic to upgrade the entire feeder systems. This paper presents a new method to achieve the line loss minimum condition and improve power quality in radial and loop distribution system by using Unified Power Flow Controllers (UPFC), one of the most important FACTS devices. For regulating voltage using PWM controllers and to minimize losses in distribution systems. First, the line loss minimum conditions in distribution systems are present then load voltage regulation is applied under line minimum condition to improve the power quality. Reference voltage of the controlled node is determined based on the assumptions that this voltage can subsequently improve all node voltages to be with in the permissible range. Keywords—Loop distribution system, series compensation, unified power flow controller (UPFC), power quality, voltage regulation, line loss minimization.