Load frequency control of a single area hybrid power system by using integral and LQR based integral controllers

The paper presents a mathematical state space model to design load frequency controllers for a single area power system consisting of thermal, hydro, gas and doubly fed induction generator based wind power generation sources. Load frequency control maintains the frequency of a power system within a prescribed limit. Different types of controllers can be used for load frequency control (LFC) of the power system. In this paper, two various kinds of controllers have used for LFC of the system. Integral (I) controller is a classical approach of LFC whereas linear quadratic regulator based integral (LQR-I) controller optimally controls all the states through the full-state feedback LQR controller. After studying and comparing the results, it has been observed that LQR-I controller provides better LFC in terms of settling time, overshoot etc and better stability to the system compared to the integral (I) controller.