Voltage and power swing stabilization by decoupled control with AVR and phase shifter

Abstract

With the development of power system controllers, it becomes feasible to control the output power of a synchronous generator directly and quickly by some FACTS controller like a solid-state phase shifter. The authors have proposed a scheme for power system stabilization by the direct generator power control which virtually linearizes swing equations. As the proposed control is capable of controlling the rotor swing to follow the prespecified linear response, it reveals some attractive characteristics; the controller is designed based on the linear system theory, the controller is robust even if some parameters are changed, and so on. The robustness guarantees the AVR to be designed independently of the stabilization for the rotor swing. In this paper, we propose a stabilizing control scheme for power swing as well as for voltage fluctuation by applying a decoupled control with a phase shifter and an AVR. The effectiveness of the proposed control has been supported with a series of simulation results from a view point of generator power and voltage stabilization.