Improving Stability Margin in Electric Power Systems by Linear Quadratic Regulator and Disturbance Model

摘要

This article deals with the design of a voltage controller using state feedback with integral action for an electric power system. The control system is tailored to achieve zero error of the voltage magnitude. First the transient response and the attraction region of the non-linear model is improved by using a state-feedback linear quadratic regulator controller. On the basis of this design, the integral action is designed as a second loop according to the internal model controller. Both feedback control systems are compared in terms of the robustness of the closed-loop dynamic response and the existing coupling between active and reactive powers when the load reactive power is changed. Simulation results show that the integral controller achieves zero voltage error even for the non-linear system.