Low voltage ride through device for wind turbines with series coupled compensation converter

A low voltage ride through device for wind turbines with doubly fed induction generator is proposed in this paper where series coupled compensation converter (SCCC) is used. The stator voltage is increased to a level that creates the required flux to keep the rotor side converter current below its transient rating. The power balance between grid and generator is achieved by using the dynamic braking resistor. The proposed strategy is capable of balancing voltages at generator terminals, so the wind turbine can continue its normal operation as demanded in grid codes. The simulation model is established in the PSCAD/EMTDC. The correctness and effectiveness of the proposed method is verified by the simulation results.