Abstract: In this paper, an adaptive enhanced damping control strategy is proposed to solve the subsynchronous oscillation（SSO） problem of doubly-fed wind farm connected to the power grid. Firstly, based on model free adaptive control（MFAC） theory, a damping joint control method for d and q axes of doubly-fed wind turbines is designed, and the control parameter optimization method is given.Secondly, the MFAC method is combined with the traditional sub-synchronous damping control（SSDC） method to obtain an adaptive enhanced damping strategy. Finally, the model is modified based on IEEE 39 nodes to verify the effectiveness and superiority of the adaptive enhanced damping control strategy. The simulation of multi-machine equivalent model shows that the adaptive enhanced damping control strategy has good adaptability to multi-machine wind power system. The adaptive enhanced damping control strategy significantly improves the performance of SSO control, has a good adaptability to the change of working conditions, makes up for the shortcomings of traditional SSDC, and shows a strong engineering application potential.