Abstract: The coordinated two-layer control strategy of integrated battery energy storage for wind power fluctuation mitigation is proposed. In the outer control, the wind power smoothing strategy based on near-zero phase adaptive filtering is proposed. This strategy not only ensures that the grid-connected power aligns with the power fluctuations at 1-minute and 10-minute timescales but also minimizes the phase lag during the control process. When the wind power is relatively stable, the energy storage system can adaptive exit operation, effectively reducing the rated power requirement and operation burden of the energy storage system. In the inner control, the dual lithium iron bisphosphate batteries with different charging/discharging characteristics are used to track the power, and the equivalent SOC index is defined to measure the overall SOC of the energy storage system. Then, the equivalent SOC is linked to the outer control, and the Logistic dynamic interval strategy for SOC optimization is proposed. It ensures that the grid-connected power meet the requirements in the optimization process, solves the extreme operation state of high/low SOC when the charge and discharge energy is unbalanced, and enables the ability of battery energy storage to continuously mitigate power fluctuations. Meanwhile, the two groups of batteries can operate at the optimal depth of discharge, so as to make full use of the cycle life.