Power System Stability Enhancement by Using Sssc Facts Device with Fuzzy Logic Controller

In recent years, expansion of power system is not as par the need of power demand which has increased substantially [3]. As a consequence, existing transmission lines are heavily loaded and the stability of the system ecomes a power transfer-resisting factor. Flexible AC transmission systems (FACTS) controllers have been mainly designed to solve such type of power system steady state controlling problems [11]. In this paper the work is “ an optimized fuzzy logic control based static synchronous series compensator(SSSC)” which is designed in place of a PI controlling technique and MATLAB based simulations are carried on a long transmission line by varying the load step by step and results are then compared with fuzzy and without fuzzy logic controller[1].The proposed fuzzy logic controller (FLC) improves power system transient stability and enhances the system damping [9]. Fuzzy logic controller works in accordance to system behavior as the input parameters of the Controller are carefully chosen such that to provide considerable damping for power system [2]. The range of the controller is determined based on simulation results of the fuzzification and defuzzification. [15]. Simulation results shows that this FLC controller with SSSC can improve stability margin of the system in the case of transient stability and provide considerable damping of power oscillations [4].