Enhancement of Power System Stability by using Power System Stabilizer and UPFC

Abstract

Among different FACTS devices, UPFC is the most superior one. Though the primary objective of UPFC is to provide powerful control of active and reactive powers, it can also be modulated effectively to improve transient performance of a system and to damp power system oscillations. In the same way, power system stabilizer (PSS) is also explained. The basic operation of PSS is to apply signal to the excitation system that creates damping torque which is in phase with the rotor oscillation. This paper presents the idea of improvement of transient stability and voltage stability of power system by utilizing the combination of UPFC and PSS. When there is a severe fault on the transmission line, real and reactive power get disturbed. A test model of power system is considered and comparison is shown between the two cases i.e. UPFC connected and without UPFC connected to the power system. Simulations are performed in Matlab/Simulink environment.