Improving Automatic Generation Control a Two-Area Power System Using FOPID with Harmony Search Algorithm

Abstract

This paper presentsanAutomatic Generation Control (AGC) system in a two-area power system with a fractional order PID (FOPID) controller. In the proposed method, a newly developed harmony search algorithm is implemented to solve the non-convex non-linear problem of AGC. The fractional order PID controller will improve the system stability and improve the robustness of the controlled system. The proposed FOPID controller also has a smaller number of parameters to tune than its existing counterparts.In order to show efficiency of the proposed approach, the response of HSA-Optimized system to disturbances is compared with the results of GA-Optimized system. The cost function of the proposed problem is considered based on Integral of Time Multiplied Square Error (ITSE). In order to improve the system performance, frequency bias factor (FBF) is modeled in the problem and the proposed method is implemented in a non-linear interconnected two area power system. Simulation results verified that employing the proposed approach in optimization process of control system would guarantee a better system performance comparing to other methods.