Abstract: As the grid-connected capacity of wind turbines continues to increase,it has become a research hotspot to suppress inter-regional low-frequency oscillations through the power regulation capability of wind turbines.This paper uses the transient energy function method to explain the principle of low-frequency oscillation between the damping regions of the DFIG.On this basis,the fuzzy sliding mode control is introduced,and the fuzzy sliding mode damping controller is designed on the rotor-side converter of the DFIG.The controller uses the oscillation signal of the regional power system as a feedback input.During the system oscillation,it provides damping for the system by changing the active power of the DFIG,thereby suppressing system oscillation.Finally,the three-phase short-circuit fault,terminal disturbance and load mutation disturbance simulation analysis were carried out on Matlab,which proves that the controller has certain robustness in restraining system oscillation.