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Robust Optimal Controller Design for Multimachine Systems using Genetic Algorithms

Power System Oscillation Controllers (PSOC) are added to Excitation systems to enhance the damping during Low frequency oscillations. This paper provides a systematic approach to damp the low frequency oscillations observed in Three Machine Nine Bus Multimachine Power Systems based on Genetic Algorithm(GA).The Optimal Controller design problem is formulated as an optimization criterion comprising of Time domain based objective function to compute the optimal controller parameters. The main objective is to minimize the integral squared error involving rotor speed deviation and power angle deviations. To validate the effective damping action of the proposed controller, Non linear Time domain simulations has been carried out in this work under wide variations in the system loading conditions. Also a comparative study has been done to show the robustness of the Genetic based controller over the conventionally designed Lead Lag controller.