Abstract: Load Frequency Control (LFC) is used to adjust the real power generation based on the load changes. When the real power demand is increased than the supply then the output frequency of the generator will reduce from the rated value. The difference in frequency between actual and rated reference value is called change in frequency. This change in frequency is used to adjust the steam supply and thereby the real power generation. Proportional (P) and Integral (I) controllers are used to control this LFC. To find the best value of this PI gain constants needs an intelligent approach is required. In this project intelligent algorithm Differential Evolution (DE) is used to find gain constant of PI controller. The advantage of the proposed controller is that it can handle system non-linearity and at the same time proposed controller is faster than the conventional controllers. The proposed controller is modeled for an interconnected two area power system as a simulation model in MATLAB/SIMULINK. The performance of intelligent algorithms based controllers are compared with the conventional Proportional Integral (PI) controller. The effectiveness of the proposed controller in increasing the damping of local and inter area modes of oscillation is demonstrated in a two area interconnected power system. The result shows that this controller has good dynamic response and at the same time faster than the conventional controller.
Keywords: Area Control Error, Differential Evolution (DE), Load Frequency Control (LFC), conventional Proportional Integral.