At present, the most choice of distribution network is radial network structure, sets tie- switches at the terminal of power lines, but in the planning, the manner that consider the output lines ampacity of substation to determine the line style will increase investment and reduce line utilization. Combined with the actual geographic information, we propose a construction mode about primary and subordinate distribution network. Firstly, based on the delaminating and districting method, we divide the terminal nodes by using modified K-means clustering algorithm, define the equivalent load point, generate primary grid with the shortest loop method; and then build a OPF model to complete the subordinate distribution network. Primary and subordinate distribution network supports on-demand selection of line style, thus, the investment would drop within the reasonable voltage level and load balance. Examples demonstrate the feasibility and effectiveness of the method.
