Load Frequency Control in Multi Machine Systems Using PID Controller

Abstract

Modern power systems networks consist of a number of utilities interconnected together. Power is exchanged between utilities over tie-lines by which they are connected. Automatic generation control (AGC) plays a very important role in power system. Its main role is to maintain the system frequency and tie-line flow at their scheduled values during normal period and also when the system is subjected to small step load perturbations. The most commonly used controller is the PID controller, which requires a mathematical model of the system. It is a good tool for the control of systems that are difficult to model. In this study, a power system with two areas connected through tie-line is considered. The objective of AGC, based on PID controller, is to damp the transient deviations (frequency and power) and to provide zero steady-state error of these variables in a very short time. The simulation is implemented by using MATLAB Simulink program.