For reducing the influence of output power fluctuation of wind farm on the power grid

a the hybrid energy storage system made up of battery-super-capacitor is taken as the base

the wavelet packet adaptive algorithm with wind power networking power fluctuation constrain is used to decompose wind power into low-frequency and high-frequency components as the power command of the wind power networking expectation power and hybrid energy storage system. At the same time

the optimal demarcation point interval of the high-frequency and sub-high-frequency power command for the hybrid energy storage is determined by way of adding the wavelet packet energy spectrum function and the number of iterations of the calculation demarcation point is reduced. Based on a detailed analysis of the economics of the energy storage system

a cost-benefit model for energy storage to smooth the power fluctuation of the wind farm is set up. Finally

the capacity allocation rules of energy storage to smooth power fluctuation under different working conditions is analyzed with the actual wind farm as example

which provides a reference for energy storage in the planning and construction of wind power grid connection.