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To enhance the Low-voltage Ride Through (LVRT) capability of large-scale centralized wind farms is essential for the safety of the wind farm and the security of the power system. However, the LVRT capability enhancement coordinating the control and protection of individual wind generators merits consideration. To contribute in this way, a Coordinated Sequential Control (CSC) strategy is proposed in this manuscript. Regarding different voltage disturbance scenarios, the goal of voltage control is determined in real-time. To keep as many wind turbines operating grid-connected as possible, a multi-staged coordination strategy is set according to the critical time to ride through the fault. The reactive power control and the shedding of the wind turbines are coordinated in the three stages of the CSC. According to the simulation results, more wind turbines can be kept grid-connected by using the proposed control strategy. Comparison studies are made among several types of coordinating strategies, emphasizing the advantages of the proposed method in terms of both validation and real-time performance.

Coordinated Sequential Control of Individual Generators for Large-Scale DFIG-Based Wind Farms