Design of Model-reference Discrete-time Sliding-mode Power System Stabilizer

Power system stabilizers 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 power system stabilizers have been reported in the literature. The sliding-mode controller is one of these approaches that has some advantages, such as parameter in sensitivity and realization simplicity, over other approaches. In this article,as a first and new approach for the design of the power system stabilizer in the literature,a model-reference discrete-time sliding-mode controller is presented. The effectiveness and the robustness of the proposed model-reference discrete-time sliding-mode controller based power system stabilizer is demonstrated by a number of studies. Simulation results show that the proposed power system stabilizer performs better for less over shoot and less settling time compared with the conventional and linear quadratic regulator based stabilizers under normal load operation and significant system parameter variation conditions