The wind power

due to its random and fluctuation

has great influence on the power flow distribution of the main grid after integration into the system.Moreover

large-scale wind farms are mostly far from the access point and the grid connection has larger reactive power requirement after power integration.Therefore

different integration schemes of wind farm have significant impacts on the operation safety and investment construction economy of the power grid.The traditional DC planning model has no way to calculate neither the reactive power flows and power loss nor perform effective constraint of busbar voltage of main grid and node voltage of station.The accuracy of the planning result is weak and

even at certain circumstance

may generate infeasible scheme.In this paper

the different grid connection mode such as direct grid connection of wind farm and grid connection through collection of station are fully considered and the optimal economy is taken as the optimization target.A kind of integer second-order cone programming（MISOCP）model for coordinated planning of wind farm integration is proposed.The AC power flow model is adopted by the model

which can effectively consider the coupling relationship among the wind power grid connection power

the active and reactive power flow

line loss and node voltage.By using stochastic optimization method and with consideration of base and random sense to balance the issue of economy and safety due to randomness of wind power output

the planning scheme is more economical and flexible.Finally

the effectiveness of the proposed model and method is verified by the calculation analysis.