A novel fuzzy logic based power system stabilizer for a multimachine system

This paper describes the design of a fuzzy logic based controller to counter the small signal oscillatory instability in power systems. The stabilizing signal is computed in real time using suitable fuzzy membership functions depending upon the state of the generator on the speed-acceleration phase plane. The use of output membership function permits further fine tuning of the controller parameters for varied system configurations specially in multimachine environment. The efficacy of the proposed stabilizing technique has been demonstrated using multi-machine computer simulation model of power system under a wide range of system and test conditions.