Abstract:In view of the problems of the asymmetric rise in the voltage depth of power grid, the instability of the power in the side converter, as well as the pulsation in DC bus, a proposal has thus been proposed of the high voltage ride through the method for the doubly-fed converter based on the coordinated output of rotor fundamental wave voltage. When the voltage asymmetry increases, there is only an output of the fundamental components of rotor voltage from the rotor side converter, with the output power of the control rotor converter being basically zero, and the pulsating power of the DC bus simultaneously transported to the power grid by the grid side converter. The experimental results show that the proposed control scheme can not only ensure that the doubly-fed wind turbine does not take off the grid with the rise of asymmetry grid voltage, but also provide a certain inductive reactive power to the power grid. Meanwhile, the cost can be saved due to the fact that the proposed method does not need the chopper circuit of the DC bus voltage.