In this paper, the fractional-order (FO) proportional-integral-derivative (PID) (FO-PID) controller is designed aiming at load-frequency control (LFC) for an isolated hybrid power system, involving a solar photovoltaic generator and a diesel engine generator. The FO-PID controller is a PID controller which has fractional order for integral and derivative. This paper engages’ particle swarm optimization (PSO) algorithm to carry out the above mentioned LFC for the considered wind-biomass isolated hybrid power system. A comparison of FO control strategy with conventional based controller techniques is made. The FO-PID controller outperforms the conventional PID controllers.
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