INTEGRATED FUZZY-LOGIC GENERATOR CONTROLLER FOR STABILITY ENHANCEMENT

An integrated fuzzy logic controller is proposed in this paper for the generator excitation and speed governing control. The proposed contro ller has three control loops: the first one is the voltage control loo p which has the function of automatic voltage regulator(AVR), the seco nd one is the damping control loop which has the function of power sys tem stabilizer(PSS), and the last one is the speed governing control l oop which has the function of governor(GOV). A simple fuzzy logic cont rol scheme is applied to all these three loops. The control scheme is simple enough so as not to require heavy computation for the controlle r, therefore, its real time application is feasible. The effectiveness is demonstrated through non-linear simulations using a one machine in finite bus system. Comparison studies are also performed to show the a dvantages of the proposed controller with conventional excitation and speed governing control systems.