Abstract: At present, the research on the fault ride-through problem of doubly fed induction generator (DFIG) is mostly confined to achieve a single control objective, namely, low-voltage ride-through (LVRT) or high-voltage ride-hrough (HVRT). How to enable a wind power system to have both low-and high-voltage ride-through capability still needs to be paid more attention. To solve this problem, the high and low voltage ride-through control strategy based on variable dynamic voltage command value is proposed in this paper by using the thought of limit division. According to the steady-state variation relationship between stator flux amplitude and stator voltage amplitude of generator, the control idea of using the steady-state relationship to deal with the transient process approximatively under small time window is put forward by analogy with the thought of limit division in mathematics. The instantaneous stator flux will be directly involved in the calculation of the stator voltage command value, which can realize the dynamic update of the voltage command value under different operating conditions, and indirectly regulate the reactive power output of the wind turbine generators, so as to achieve the purpose of reducing the range of the generator side voltage variation during the fault. The simulation results show that the proposed control strategy can accelerate the decay rate of the transient process and output reactive power to the grid rapidly, which is beneficial for the wind power system to reach the new steady state during the fault ride-through. It is a unified control strategy which can realize both transient control and steady-state control, as well as high and low voltage ride-through control.