When the grid fails, the doubly-fed wind power generation system needs to operate without off-grid and provide reactive power support to the grid. The doubly-fed wind power system using traditional rotor-side converters cannot meet this requirement. In order to improve the low voltage ride-through capability of the DFIG system, protect the rotor converter, and quickly provide reactive power support to the grid and help the grid voltage recovery, this paper proposes a new H-bridge-based rotor-side converter for doubly-fed wind turbines Topology, when the grid voltage drops, the ability of the output voltage of the rotor-side converter to be quickly improved, to ensure that the rotor-side converter is always controllable during failures, and to provide reactive power support to the grid. The simulation results verify the effectiveness of the method.

H-bridge; doubly-fed induction generator; low voltage ride through; reactive power support;