Power distribution network extension planning method with reliability constraint

The invention relates to a power distribution network extension planning method with reliability constraint, and belongs to the technical field of power system planning. According to the technical scheme, total cost serves as a target function, equipment investment cost, equipment operation and maintenance cost and reliability cost are considered in the target function, firstly, an effective and accurate reliability evaluation model is proposed, and reliability constraints are embedded into a planning model; secondly, a group of radial constraints are involved in the model, so that the radial operation of the obtained power distribution network is effectively ensured; the method has the advantages that the defect that in a traditional planning method, a reliability evaluation method cannot be embedded into a planning model can be effectively overcome, meanwhile, economy and reliability of a planning scheme are considered, grid structure planning can be conducted on a power distribution network, and investment