The stabilization of power systems has been an important subject for a reliability, due to the large scale and complexity. For improving a controllability of stabilization, several stabilizing methods have been studied, such as nonlinear and robust controls.
The purpose of this paper is to construct a sliding mode control based on fuzzy model for electric power systems. A fuzzy model composed of the fuzzy inference is introduced to treat the nonlinearity of the system. The consequent part of a fuzzy process law is constructed by a linear system. The sliding mode control using optimal switching vector is applied to each linear system of a process law, and a control input is given by a fuzzy inference for sliding mode control input. Then the method becomes nonlinear and robust control. In order to demonstrate the control effect of the proposed method, numerical simulation is performed by using 3 machine-9 bus power system with an automatic voltage regulator and a governor as controllers. The method gives good control effect for both small and large oscillations.