A Fuzzy Logic Controller for Enhancing the Transient Stability of 48-Pulse Inverter Based SSSC

The Static Synchronous Series Compensator (SSSC) is one of the recently developed Flexible AC Transmission System (FACTS) devices. In this paper, the SSSC is realized using a 48-pulse voltage source inverter. Fuzzy logic controllers are designed to operate the SSSC in the automatic power flow control mode. The parameters of the fuzzy controllers are varied widely by a suitable choice of membership functions and parameters in the rule base. The effectiveness of the fuzzy controllers is tested on a single machine infinite bus power system operating with a SSSC for a variety of transient disturbances and variation of operating point.