Abstract

Static Var compensator (SVC) is one of flexible AC transmission system (FACTS) elements mainly used for reactive power and voltage control in power systems. This paper deals with multi-modal electromechanical oscillations damping in the presence of severe disturbances. These oscillations include local modes, inter-area modes and inter-plant modes. To enhance the damping of the oscillations, a complementary controller is added to voltage regulator of SVC. In order to design such a controller, a multi-objective optimization model is employed and non-dominated sorting genetic algorithm-II (NSGA-II) approach is used to produce sets of Pareto optimal solutions. Also, a fuzzy method is utilized to select the best compromise solution. The proposed method is examined on a two-area power system and simulation results illustrate the robustness and the efficiency of the proposed controller.