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Design of optimal power system stabilizer using GA and PSO: A comparative study

The dynamic power system are always prone to disturbances which drive the system to a-stable electromechanical oscillations. Such small signal un-stability is effectively damped out by PSS. In this paper, the approaches of design have been based on GA and PSO. Certain objective functions have been taken to be optimized to get the PSS parameters using GA and PSO. The synchronous machine speed and angle deviations with respect to time for power system are made less oscillatory by designing robust PSS. Conventional lead-lag based PSS has been tuned using GA and PSO. During system upsets, PSS sustains its stability better than traditional methods.