In order to stabilize the fluctuation of wind power and guarantee the energy storage state (SOC) to track a given target value, a multiple time-scale flexible control strategy is proposed for the coordinated optimization control. Firstly, the normal distribution method is used to analyze the capacity ratio of wind farm and energy storage; secondly, the moving average filter algorithm with dead zone is used to smooth the wind farm real-time data, the short-term power forecasting data of wind farm is used to achieve rolling optimization of energy storage charge-discharge power based on the principle of Model Predictive Control (MPC); finally, a vanadium redox flow battery model and flexible control strategy model are built in Matlab, the wind farm operation data is used to verify the model. The simulation results verify the correctness and effectiveness of this method which can not only avoid the fluctuation of wind power, but also ensure the energy storage SOC does not deviate from the target value. This work is supported by Coal-based Key Scientific and Technological Projects of Shanxi Province (No. MD2014-06) and the Large-scale Energy Storage Technology and Industrialization Research Subject in Shanxi Province (No. 201603D112004).