Differential Evolution based TDF-IMC scheme for load frequency control of single-area power systems

This paper presents a differential evolution optimization based modified control configuration for load frequency control of single-area non-reheated thermal power system. The proposed scheme contains an internal model control (IMC) controller in the internal loop and a PID controller in the external loop. The IMC controller is designed by using low pass filters and a predictive model (PM) which is derived from the system model using the Routh approximation method. The tuning parameters of low pass filters and external loop controller are optimized by using Differential evolution (DE) optimization. The proposed method provides a faster external load disturbance rejection and gives better robustness under parameter uncertainties.