Design of an Optimal tuned Sliding Mode Controlled Power System Stabilizer for Stability Enhancement by Damping the Low Frequency Oscillations

The paper presents an optimal tuned Sliding Mode Controlled Power System Stabilizer (SMC-PSS) for small signal stability enhancement by damping the low frequency oscillations. The sliding mode control is one of the best techniques for controlling a system, under uncertainties. In power system, the chances of load fluctuations and perturbations are very common. In the proposed scheme, the design of a chattering free, high gain controlled, optimal tuned Sliding Mode Controlled Power System Stabilizer is suggested for damping the low frequency oscillations due to imbalance in loading and generation. In addition, optimal tuning of the parameters in sliding mode controller is done, to reduce the high gain problem, in the design of PSS. The proposed design has been tested in Multi machine system under different operating conditions. The comparison of the proposed design has been performed with Lead Lag PSS, Classic SMC PSS design. By analysing the time simulation results and stability performance, it is evident that Optimal tuned SMC-PSS has produced a better performance compared with Conventional Stabilizer Design.