Modelling of UPFC (Unified Power Flow Control) to Improve Stability of Power System by Real and Reactive Power Control of Transmission Line

Abstract

Power systems are very complicated, and it needs careful fabrication of recent equipment considering the already existing devices. Flexible AC transmission system (FACTS) devices are introduced to improve the controllability and to raise the power transfer capacity of electric power systems. In this paper, unified power flow controller (UPFC) is opted among various FACTS devices to improve real and reactive power flow in the transmission line. When UPFC is not connected to the system, real and reactive power through transmission line cannot be controlled. In this paper, a UPFC model has been designed and implemented using MATLAB/Simulink. The simulation results obtained from the model show the improvement of power quality and voltage stability in transmission line.