A coordinated voltage control scheme for power system with wind farm integration based on EID compensation

Abstract

Rapid increase of wind power installation brings new issues and challenges for grid security operation and one of the most important key issues is reactive power and voltage control capability of wind farms. This paper proposes a coordinated voltage control strategy for power system with wind farm based on equivalent input disturbances (EID) compensation. Firstly, the voltage control model of power system with wind farm based on doubly fed induction generator (DFIG) is established. The power system adopts reactive power compensation device for voltage control, and the wind farm connected to the grid adopts frequency converter of DFIG to adjust reactive power output. They can coordinate each other to realize voltage stability control of the wind farm connected to the grid. Moreover, when the system is subjected to load disturbance or wind speed disturbance, the proposed method based on EID compensation also can keep the voltage stability of power system with wind farm. Finally, the simulation results show the feasibility and effectiveness of the proposed voltage coordinated control method in voltage regulation.