@IJMTER-2015, All rights Reserved 367 GA Based Design of PID Controller for Two Area Load Frequency Control Divyansh Prabhakar 1 , Vijay Bhuria 2 1 Department Of Electrical Engineering, Madhav Institute of Technology &ScienceGwalior, India 2 Department Of Electrical Engineering, Madhav Institute of Technology & Science Gwalior, India Abstract— Maintaining demand-supply balance and regulating frequency are key issues in power system control. Conventional approaches focus on adjusting the generation so that it follows the load. Power system deals with continuously varying load with respect to time which results variation in frequency, thus leading to load frequency control problem (LFC). These variations in frequency is highly undesirable and have maximum acceptable variation in the range of ± 0.5Hz.In this paper,GA tuned PID controller is used to improve the dynamic response.The results show that by use of GA tuned PID controller, frequency reaches a steady state value within a specified time. By developing MATLAB code for GA based PID controller, satisfactory results are obtained. The strength of the controller is confirmed by using MATLAB/SIMULINK software. Keywords— Genetic Algorithm, Load frequency control, PID controller, MATLAB/SIMULINK. I. INTRODUCTION In power system the imbalance between generating side and load side should be corrected within a short period of time otherwise it will drive the line frequency into unstable region. If the frequency deviation is large then it will negative effect on the system and sometimes in worse conditions it can also permanently damage our system. The overall operation of power system can be much better controlled if the frequency is kept within particular limits.Therefore maintaining balance between generation and load have become a significant topic in power system operations.If we need to keep our system in balance than we have to control both the active and reactive power.The main aim of the control strategy is to generate and deliver power in an interconnected system as economically and reliably as possible while maintaining the voltage and frequency within permissible limits. Real power mainly affects the system frequency while the reactive power is less sensitive to change in frequency. Reactive power is mainly depends on the change in voltage magnitude. The load frequency control loop controls the real power and frequency and the automatic voltage regulator regulates the reactive power and voltage magnitude. Load frequency control plays a significant role in the interconnected power system and has made the operation of interconnected systems possible. In literature, there are several control strategies which are based on conventional linear control[1]. But these conventional controllers do not provide suitable results because of the complexity of the power system like non linear load characteristics and variable operating points. The conventional PID control scheme does not provide a high degree of control performance[2]. PID controllers are extensively used in industrial applications to control the different parameters of a plant. Conventional PID controllers contain non linearities and have high overshoot and settling