Enhancement of power system stability with FACTS using adaptive fuzzy controller

This paper presents an adaptive fuzzy controller for flexible AC transmission system (FACTS) equipment in order to improve the stability of the power system. The adaptive fuzzy controller is systematically constructed on the basis of a control law with the system stability obtained from sliding-mode control. Moreover, the proposed fuzzy controller possesses an on-line adjustment system which adaptively adjusts the coefficients for the operation part of the fuzzy rules so as to damp the oscillation of generators. The simulation results show that the proposed controller can be robust to the variations of the system parameters, system operating conditions and fault points.