Controller Design Strategies for Load Frequency Control in Power System

Abstract

This study contributes comparative analysis of controller design strategies for load frequency control (LFC) in the field of power engineering. In order to present the need of controller for frequency control due to variation in load, proportional integral derivative (PID), and FOPID controllers are discussed. Five different approaches, to design PID controllers, have been identified such as direct synthesis approach in frequency domain, Laurent series expansion, linear matrix inequality (LMI) approach, quadratic regulator approach with compensating pole (QRAWCP), and internal model controller (IMC) for comparative analysis. These techniques have been tested on reheated and non-reheated turbines of LFC. Furthermore, robustness of these techniques has been investigated by incorporating fifty percent perturbation in turbine model. The results are compared in terms of time response parameters. Additionally, the performance of PID controllers is compared with fractional-order (FO) PID controller available in the literature. It is concluded that FOPID controller has better performance.