With the constantly increasing penetration of distributed generation

some problems such as the low comprehensive operation efficiency of the power system concerned

insufficient coordination among the so-called“source-network-load-storage”

and inadequate complementarity among various types of generators are becoming more and more significant. Implementing hierarchical partition balance of“source - network -load - storage”could address these problems.Under this background

according to the operation rules of a grid- connected microgrid

a diversified power demand block analysis method and a“source-network-load-storage”hierarchical partition balance model are presented

and related optimal design of the distribution network concerned addressed. The proposed method has been employed for actual distribution system planning

and the implementation results demonstrate that this method can effectively reduce the maximum load demand

improve the load profile of the whole system and the load rates of lines

reduce the scale of required network investment

realize coordinated development of“source - network - load- storage”

and finally improve the security and economics of the distribution system.