A Multi-parameter Optimization Setting Method of Reactive Power Control for Fault Recovery Process of Doubly-Fed Wind Farm

After the grid-connected system of doubly-fed wind farm fails, it typically undergoes the stages of fault period, fault removal and normal operation. At present, the related research primarily focuses on reactive power control (RPC) for low voltage ride-through (LVRT) of wind farms during the fault period. In fact, the problem of high voltage off-grid caused by transient overvoltage during wind power recovery after fault removal also needs attention. This paper provides a multi-parameter optimization setting method of RPC for the fault recovery process of doubly-fed wind farm. The implementation of RPC by this method can fully consider the limit capacity and response speed of different means such as rotor side converter (RSC), grid side converter (GSC) of doubly-fed induction generator (DFIG) and reactive power compensation device, and coordinate with the fault protection action of the transmission line of wind power system, and improve the voltage transient recovery trajectory of wind farm. The effectiveness of the proposed method is verified by a multiple parallel doubly-fed wind farm test system.