With the development of wind power generation, the impact of wind power fluctuations on the grid is becoming more and more obvious, and smoothing wind power output is very important. Aiming at the fluctuation characteristics of wind power, a wavelet packet decomposition method is proposed to obtain the wind power connected to grid, the reference power of the hybrid energy storage system, and the state of charge and discharge. Based on the state of charge of the battery and super-capacitor, the coordination control strategy realizes the internal power correction of the energy storage system. The results of the calculation examples show that the coordination control strategy can complete the optimization correction of the internal power of the hybrid energy storage system and effectively smooth the wind power output. Based on actual wind power data, by establishing a mathematical simulation model in MATLAB, the effectiveness of the coordination control strategy is proved.