Study of PID Controllers to Load Frequency Control Systems with Various Turbine Models

This paper studies the load frequency control problem for various systems under various controller design\ud methods. Frequency should remain nearly constant for satisfactory operation of a power system because\ud frequency deviations can directly impact on a power system operation, system stability, reliability and\ud efficiency. A Load Frequency Control (LFC) scheme basically incorporates an appropriate control system for an\ud interconnected power system, which is having the capability to bring the frequencies of system to original set\ud point values or very nearer to set point values effectively after any load change. This can be achieved by the use\ud of conventional and modern controllers. In this proposed paper PID controller has been applied for LFC power\ud systems. The parameters of the PID controller are tuned by different methods names as Ziegler-Nichols (Z-N)\ud Method, and IMC method for better results. We use various tuning formulae in Z-N method and certain model\ud approximation methods and the responses of LFC with model approximation are studied. It is seen that the\ud results obtained are as good as the conventional controller