Fuzzy PID based on Firefly Algorithm: Load Frequency Control in Deregulated Environment

A Firefly Algorithm (FA) based on Fuzzy PID controller is proposed in this paper to solve the Load Frequency Control (LFC) problem in a deregulated environment. In multi area electric power systems, if a large load is suddenly connected (or disconnected) to the system, or if a generating unit is suddenly disconnected by the protection equipment, there will be a long-term distortion in the power balance between that delivered by the turbines and that consumed by the loads. This imbalance is initially covered from the kinetic energy of rotating rotors of turbines, generators and motors and, as a result, the frequency in the system will change. This paper applied a fuzzy controller to solve this problem. The results of the proposed controller are compared with the classical fuzzy PID type controller and classical PID controller through ITAE and FD performance indices. Keywords; FA, Load Frequency Control, Two-Area Power System, Deregulated Environment.