Enhancement of Voltage Profile and Minimization of Transmission Line Losses Using Unified Power Flow Controller

Abstract—Loss minimization in power system is an important research issue. Transmission line losses in a power system can be minimized by means of reactive power compensation. After the establishment of power markets with transmission open access, the significance and use of Flexible AC Transmission Systems (FACTS) devices for manipulating line power flows to relieve congestion and optimize the overall grid operation have been increased. This paper presents a technique to provide simultaneous or individual controls of basic system parameters like transmission voltage, impedance and phase angle, there by controlling the transmitted power using Unified Power Flow Controller (UPFC). The Particle Swarm Optimization (PSO) technique is used to compute the power flow. The performance of this technique is tested using IEEE 5 bus and IEEE 14 bus systems. The test result showed that the location of UPFC improves the voltage profile of the system and also minimize the transmission line losses