Design of model-refence discrete-time sliding mode power system stabilizer

Power system stabilizers (PSSs) improve the dynamic stability of power systems by increasing the damping torque of the synchronous machines in the system. Over the last four decades, various approaches for the design of PSSs have been reported in the literature. Sliding mode controller is one of these approaches which has some advantages, such as the parameter insensitivity and the realization simplicity, over the other approaches. In this paper, as a new approach for design of the PSS, a model reference discrete time sliding mode controller (MRDSMC) is presented. The effectiveness and the robustness of the proposed MRDSMC based PSS is demonstrated by a number of studies. Similation results show that the proposed PSS performs better for less overshoot and less settling time compared with the conventional and LQR based stabilizers under normal load operation and the significant system parameter variation conditions.