Fuzzy logic based static synchronous series compensator (SSSC) for transient stability improvement

A fuzzy logic approach is applied to coordinate two control inputs: in phase voltage and quadrature voltage control of static synchronous series compensator (SSSC) to improve the transient stability of a SMIB system. The main aim of the paper is to analyze the effect of coordinated fuzzy logic based SSSC on real power flow, damping of first swing and to improve transient stability margin of a single machine infinite bus system. The two different controllers namely; [i] Conventional power oscillation damping controller of SSSC (NFLC), [ii] Fuzzy logic based coordinated controller of SSSC (CFLC) are considered for their comparative studies. Fuzzy rules for the controller are based on measurable components of the transmission line. Simulation results show that the proposed fuzzy logic based controller provides satisfactory performance in terms of increase in power transfer capability, improved damping of transients and transient stability margin of the test system. The performance of the controller is validated using advance software MATLAB.