In view of the issue of distributed wind-storage integrated system（DWSIS） planning

a bi-layer planning model with assurance of maximum total capacity of DWSIS and also with consideration of the most overall economy is proposed in this paper. Namely the maximum total capacity of DWSIS is the up layer plan objective with consideration of constrain of wind power use ability which is composed by the wind energy resources of each area and grid assets; the most optimal economy of DWSIS is low layer plan objective

which is further divided into some problems about the optimal matching between the wind power capacity and energy storage capacity of access points with main consideration of the constrains of DWSIS reliability and wind farm and energy storage power output target

etc. The effects of wind turbine type and Weibull parameters to the capacity planning results is further proved and analyzed by real example. It is shown by the result that both the model and the algorithm are reasonable and feasible and the study results can provide some reference for the capacity planning of DWSIS.