Design of second order sliding mode controller for synchronous generators based on singular perturbation method

Abstract

Power system stability can be strengthened by controlling excitation of synchronous generators. In this paper, the singular perturbation method is applied to decouple the synchronous generator into two subsystems with different time scales. Based on the composite control theory of the singular perturbation system and the robustness of the sliding mode variable control, the suboptimal second order sliding mode control algorithm is applied to realize the control of each subsystem. Thus the control algorithm of each subsystem is obtained. The composite control of the synchronous generator is realized according to algorithms for each subsystem. The second order sliding mode control algorithm is presented in this paper, such that the chattering is eliminated and the robustness of the system is ensured. The singular perturbation algorithm is proposed to reduce the system dimension. The simulation results prove the effectiveness of the proposed algorithm.