Robust control design of PSS for dynamic stability enhancement of power system

A Sliding Mode Controller (SMC) is adopted in this work with a Proportional Integral Derivative (PID) to achieve robust control signal and employ it instead of Power System Stabilizer (PSS). The major technique is basically focusing on the control accuracy. The main proposal is that the effective property of PID and high characteristics of SMC are combined to eliminate the chattering effect of SMC in order to generate best control signal to the excitation system. Speed deviation is chosen as sliding variables. The robust design of SMC-PID has been employed to enhance the power system stability and further to damp out strongly the system oscillations that caused by the disturbances. In order to validate the robustness of the mentioned scheme, the proposed proposition is evaluated on Single Machine Infinite Bus (SMIB) power system under different perturbations with pre-specified operating condition. For comparison, the tested power system is carried separately through different designed controllers. The simulation results have demonstrated the high performance of mentioned controller that attained best results compared to various controllers.