Simulation and Analysis of Automatic Load Frequency Control Using PI Controller

Abstract

The preliminary role of an automatic load frequency control (ALFC) is to control the real power as well as
frequency. The load on the power network is always changes with time, resulting in the change in frequency. The change in
frequency is highly undesirable in power system and maximum permissible range of frequency is ±3%. One of the major
requirement in system is to give reliable and quality operation in multi-area system. In interconnected large power system
variation in frequency can lead to serious large-scale stability problem. Here to control the frequency variation, PI
controller is used for both single as well as two area control system. In single and two areas, the simulation is done through
with and without reheat system.