Low Voltage Ride Through of Doubly-fed Wind Farm Based on STATCOM with Fuzzy PI Control

Abstract

System failure or voltage drop will lead to large-scale disconnection of wind turbines. Aiming at the problem of low voltage ride-through capability (LVRT) of doubly-fed wind turbine (DFIG), this paper firstly analyzes the reactive power regulation capability of DFIG and its power limit. Then based on the operation principle of STATCOM, a fuzzy PI control strategy is proposed to overcome the shortcomings of traditional PI control, such as full response speed and low accuracy. Finally, the DFIG grid-connected model of STATCOM is built by MATLAB/Simulik, and the fuzzy PI controller is designed. The simulation results show that compared with the traditional PI control, STATCOM has the advantages of fast response and strong robustness to improve the DFIG low voltage traversal capability under the fuzzy PI control strategy.