Enhancing Power System Transient Stability Using Static VAR Compensator Based on a Fuzzy Logic Controller

Abstract

Running power systems near their maximum operating limits can cause instability if a disturbance occurs. Conventional procedures can dampen the system's oscillations, such as speed and voltage regulation of generator units, or by using a flexible AC transmission system (FACTS) device. These devices are extensively utilized in power systems. In this paper, the transient stability of the power system has been enhanced by the proposed static var compensator (SVC) based on a fuzzy logic controller (FLC) compared with the conventional SVC based on a Proportional Integral (PI) controller. Six distinct categories of failures were examined. The proposed FLC responses were compared with the conventional PI controller regarding the difference in rotor angle between machines, the transmission line active power, synchronous machines speeds and terminal voltages variation, thyristor switched capacitor (TSC) response, reactive power, and thyristor controller reactor (TCR) response. MATLAB-Simulink evaluated the proposed SVC based on an FLC on a two-machine, 3-bus power system. The simulation result showed the superiority of the SVC based on an FLC over the conventional SVC based on a PI controller. The maximum overshoot improved by 11.94%, and the settling time improved by 9.47%. In addition, it is noted that the proposed FLC contributes to compensating about 16.2% of the system's equivalent kinetic energy.