Robust Pid Design for the Deregulated Power System Using HSA
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The frequency load control system was modeled in the two-area restructured system. In case of a sudden load variation in one area, the system frequency undergoes a corresponding change (normally accompanied by a series of transient oscillations). Therefore, the feedback and control mechanisms must be designed in such a way that proper power generation regulation in the generators can be implemented by regulating the control signal in the turbines. Thus, in the steady state, power generation would be exactly equal to the load; and the power passing through transmission lines, frequency drift, and ACE error in the zones would be zero. A high-pass PID filter was used in the controller for damping frequency oscillations. The controller control parameters were converted into an optimization problem and the harmonic search algorithm was used to solve this problem. For obtaining an optimal and efficient design, different working points were considered. The simulation results were compared with the results obtained from genetic algorithms and particle swarm optimization (PSO) algorithms for the purpose of evaluating the efficiency of the proposed controller.