Indirect IMC based PID Controller Design for Single Area LFC System in the Presence of Uncertainty and Communication delay

Abstract

In today's fast growing world, there is an absolute demand of good quality power supply. Lots of research has been undertaken in this perspective but the external disturbance rejection and the parametric uncertainties remain a crucial issue for the control engineers. Therefore, in this paper, an indirect approach of IMC-PID controller design technique is proposed for LFC system. This control algorithm introduces a shifting variable Ψ for the designing of controller parameters so as to improve the performance and robustness of the system. The effectiveness of the proposed control technique is verified through the comparative study of disturbance rejection ability and computation of performance indices with the existing integer order control techniques. Besides, the robustness of the proposed technique is verified in the presence of parametric uncertainties, communication delay and system nonlinearities. The simulation results reveal that the proposed control technique exhibits better disturbance rejection, an improved transient performance as well as robustness to uncertain system parameters and communication delay in comparison to various integer order controller techniques exist in the literature.