One of the important reasons for the difficulty of wind energy dissipation is the inconsistency between wind power cluster access planning and regional grid access. On the one hand, the wind power access capacity and access mode are coupled with the main grid and the arrangement and operation of conventional power sources, which affect the overall economy and the effect of wind power dissipation; on the other hand, the whole power fluctuation characteristic of wind power cluster is different from that of single wind farm, which affects the planning. In this paper, the operation constraints of Unit start-up and shut-down are considered to minimize the sum of investment cost, operation cost, abandoned wind cost and lost load cost, based on the relationship between "zero-output probability of wind farm cluster" and "convergence capacity", a mixed integer model for coordinated planning of wind farm cluster access and regional grid is established. Finally, an example is given to illustrate the effectiveness of the proposed model and method, which can optimize the overall planning scheme under the condition of maximum wind power and system security.