Abstract: Wind power is highly dependent on wind speed，which is variable，so it would bring serious stability problems to the power system． To solve this problem，many power generation companies or grid operators start to use ESS( Energy Storage System) ． In order to reduce the cost of the ESS and wind power fluctuations，A pitch Angle of the ESS and coordinated control method are proposed． According to the size of the rotating speed，to control pitch Angle and ESS，decrease can measurement of fluctuation of wind power in the power system and reduce the capacity of ESS，in Matlab /Simulink environment，the simulation results show that compared with the traditional ESS control，power fluctuation has fallen by 5． 6%，ESS capacity is reduced by 50%，The effectiveness of the proposed control strategy in reducing power fluctuation is proved．

Key words: wind power fluctuation, slurry pitch angle control, energy storage system( ESS) control