Research on Low and High Voltage Interlocking Fault Ride-Through Control Strategy for Doubly-Fed Wind Turbines

In recent years, after the voltage at the grid-connected point drops due to the failure of the wind turbine, there are frequent cascading failures caused by the sudden rise of voltage due to excessive reactive power compensation. In order to enable wind turbines to provide suitable power support in case of grid failure. The wind turbines connected to the grid are required to have LVRT ability and HVRT ability according to the national standard. In this paper, a low-high voltage interlocking FRT strategy for reactive power input control of RSC and GSC by a DFIG is used. The limit values of reactive currents issued by RSC and GSC when chain faults occur and the allocation principles are discussed. It is verified through simulation that the continuous low and high voltage ride-through ability of DFIG during operation can be effectively ensured, which in turn ensures the stable operation of DFIG.