Power System Stabilizer (PSS) is installed in the Automatic Voltage Regulator (AVR) of the generator; it must be capable of providing appropriate stabilization signals over a broad range of operating conditions and disturbances. Traditional PSS rely on robust linear design methods. In an attempt to cover a wide range of operating conditions, expert or rule based controllers have also been proposed. Fuzzy logic as a robust control design method has shown promising results. In this study, a systematic approach to fuzzy logic control design is proposed In order to accomplish the stability enhancement speed deviation ( ) and acceleration power deviation ( p) of the rotor synchronous generator have been taken as the inputs to the fuzzy logic controller. These variables take significant effects on damping the generator shaft mechanical oscillations. The stabilizing signals have been computed using fuzzy membership function depending on these variables. This thesis presents a study of fuzzy logic power system stabilizer for stability enhancement of multi-machine system, represents a real time system which is executed by one of the thermal power station of TNEB. The performance of the system with fuzzy logic PSS is compared with the system having conventional PSS and the system without PSS.
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