Abstract
A reliable and economical electrical power system plays a vital role in the economy of any country and its failure may seriously affect the economy. In order to achieve the reliable performance of the power system, different research techniques are being carried out. The Flexible Alternating Current Transmission System (FACTS) is a cutting edge technology and its key function is to enhance the control and power handling capability of Alternating Current (AC) transmission systems. The Unified Power Flow Controller (UPFC) is the advanced FACTS controller developed with the properties of phase shifting, voltage regulation and series compensation. It is capable of controlling the active and reactive power through a transmission lines. In this research work, the data of 220 kV transmission line has been collected and unified power controller has been designed in MATLAB/Simulink environment software to increase the reliability and performance of the transmission line. The 220 kV transmission line model has been simulated with and without UPFC in the system using MATLAB software. The simulation results of UPFC are compared to prove that this type of controller has a great impact for controlling active and reactive power of transmission line than other conventional controllers.