Robust parameter design of power system stabilizer based on Taguchi method and Lyapunov function

Power system stabilizer (PSS) is an effective device to suppress low-frequency oscillation in power system, so its parameter design directly influences the performance of PSS. To make the designed PSS parameters possessing good robustness to remedy the insufficiency of PSS parameters designed by traditional eigenvalue analysis method, utilizing basic design principle of Taguchi method and the maximized signal to noise ratio (SNR) calculation by specific Lyapunov function is taken as objective function and the optimal design of PSS parameters are optimized by genetic algorithm (GA). Simulation results of single-machine infinite bus system show that applying the proposed optimal design method to the design of PSS parameters the useful system information can be extracted more effectively and the calculation burden can be obviously reduced. The designed PSS possesses good oscillation suppression ability and robustness, and its comprehensive performance is superior to that of PSSs designed by traditional design methods.