DESIGN AND APPLICATION OF A FUZZY-LOGIC CONTROL SCHEME FOR TRANSIENT STABILITY ENHANCEMENT IN POWER-SYSTEMS

A fuzzy logic controller is designed to implement variable series capa citor compensation in the transmission network of interconnected power systems. This compensation scheme is one of the most widely accepted as a solution to limitations created by overstretched generation and t ransmission systems. This is one facet of flexible AC transmission sys tems (FACTS) employed to enhance the stability of the system. The effe ctiveness of the fuzzy logic controller to properly control such a var iable series capacitor under different types of system disturbance is demonstrated through simulation studies on a single-machine infinite-b us system. The results of these simulation studies show that the contr oller can contribute tremendously to the enhancement of power system t ransient stability during such disturbances. Considerable increase in power throughput and significant improvement in the damping of the ele ctromechanical oscillations are achieved by implementing this device i n the transmission system.