Published Paper Details:

The objective of the Power System Stabilizer (PSS) is added to excitation system to improve the damping during low frequency oscillations. The performance of PID-PSS depends upon the generator operating point and the system parameters, but a reasonable level of robustness can be achieved depending on the tuning method. In this paper a optimization method based on Grey Wolf Optimizer is used for tuning the PID parameters. In GWO-PID-PSS, the nonlinear model of single-machine infinite bus system is linearized at various operating point and a linear model is obtained. For this model, a common PID parameters are tuned using GWO algorithm. This robust GWO-PID-PSS is applied to non-linear model of a single machine system at various equilibrium points. The simulation results clearly indicate the effectiveness and validity of the fast output sampling technique method.This paper also extended to a comparative analysis of Optimum PID using Grey Wolf Optimizer (GWO) based PSS and fast output sampling based PSS for small signal stability enhancement. The simulation results are analyzed using MATLAB/Simulink tool and shows the effectiveness of proposed controller.