This paper presents a design procedure for a fuzzy logic based damping controller for the power system. In the proposed fuzzy
expert system, speed deviation (A(0j and its derivative (Ad) ) are selected as fuzzy inputs. The parameters ofthe fuzzy logic damping
controller (FLDC) are tuned through Genetic algorithm (GA). To demonstrate the robustness of the FLDC, Simulation studies on
single machine infinite bus (SMIB) system subjected to small perturbation and three-phase fault are carried out. Simulation
studies show the superiority and robustness of GA based fuzzy logic power system damping controller over the conventionally
tuned controller over a wide variation in loading conditions