Design of Robust Power System Stabilizer using Genetic Algorithm-based Fixed-Structure H∞ Loop Shaping Control

Abstract

This paper proposes a genetic algorithm (GA)-based fixed-structure H∞ loop shaping technique to design a robust power system stabilizer (PSS). The fixed-structure of designed PSS is a 2nd-order lead-lag compensator. In the design, system uncertainties are modeled by a normalized coprime factor. The performance and robust stability conditions of the designed system satisfying the H∞ loop shaping are formulated as the objective function in the optimization problem. The GA is applied to solve an optimization problem and to achieve control parameters of PSS. The performance and robustness against system uncertainties of the designed PSS are investigated in the single-machine infinite bus system in comparison with a conventional PSS and a PSS designed by H∞ loop shaping. Simulation results show that the robustness and damping effect of the proposed PSS are almost the same as those of the PSS with high-order controller designed by H∞ loop shaping method.