Two-staged (PDF+1PI) Controller Design for Load Frequency Control

This article proposes the utilization of moth flame optimization (MFO) algorithm for tuning parametric gains of the proportional with derivative controller along with derivative filter cascaded with 1-Proportional Integral (PDF+1PI) controller for load frequency control (LFC) of interlinked power system. In this work, a two-area thermal reheat power system is considered with a loading disturbance of 10% in area-1. Pre-eminence of the recommended control methodology is confirmed by matching the system response with the earlier available results obtained by using ABC tuned Proportional integral derivative (PID) controllers implemented in the same power system [4]. The analysis is further extended to validate the robustness of the recommended control approach where the load in area-1 is further increased by 10%. Integral Absolute Time Error (ITAE) is taken the fitness function for the optimisation technique. Dominance of the suggested method over the other method is evidenced by comparison of settling time, undershoot & overshoot of the transient response.