Design of Augmented Fuzzy Logic Controller to improve stability in Power System Stabilizer

In this paper, structure of fuzzy logic controller is presented. Power systems are subjected to low frequency disturbances that might cause loss of synchronism and an eventual breakdown of entire system. These oscillations limit the power transmission capability of a network and cause loss of synchronism. Power system stabilizers (PSS) are used to damp these low frequency oscillations by providing an additional signal by using fuzzy logic controller (FLC). The fuzzy logic has the features of simple concept, easy implementation and efficient. Fuzzy logic controllers are based upon empirical control rules. Fuzzy logic based power system stabilizer is used to improve the closed loop performance of a power system and to maintain the stability of system.