PSO-based power system stabilizer for minimal overshoot and control constraints

Power systems are subjected to severe repetitive oscillations that might cause generators shaft fatigue and consequently breakdown. The paper presents a simple design technique for power system stabilizers (PSS) that minimize the maximum overshoot; thus generator shaft fatigue is alleviated. The levels of control signal, as well, have to be maintained within certain bounds imposed by physical and practical considerations. According to this regard, a technique based on Particle Swarm Optimization (PSO) is introduced to identify the parameters of a fixed structure lead compensator through the solution of a min-max problem while satisfying systems constraints. To robustify the PSS performance under wide loading conditions, a set of operating points is considered within our approach. The designed PSS is applied to a single machine infinite bus system operating at different loading conditions and the results demonstrated the effectiveness of the developed technique.