Wind power has the characteristic of generation output variability

to reduce the influence of grid power fluctuation on grid security

this paper put forward the piecewise smooth wind power output fluctuation method for energy storage optimization allocation. Considering the constraints by power fluctuation

energy storage charging/discharging efficiency and state of charge

the capacity and power of energy storage system to meet the demand of smoothing output fluctuations is determined. Practical wind power data of 50 MW wind farm of Fujian simulation analysis

the results show this method can better determinate the storage system configuration of the rated power and rated capacity.