1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China;3.Yangzhou Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd., Yangzhou 225009, China

In order to improve the efficiency of power supply reliability calculation for the complex distribution system, a reliability calculation method based on the Neo4j graph database is proposed. Firstly, the topology structure of the distribution network is stored in vertex-edge form through the graph database. Meanwhile, the feeder classification and load partitioning in the complex distribution system are completed by using the characteristics of different types of edges in the Neo4j graph database, and the diagram model of distribution network based on the graph database is built. Secondly, the subgraph division of the distribution network diagram model is combined with path search, and the model simplification is completed based on each subgraph. Finally, the power supply reliability analysis of the distribution system is realized based on the minimal path reliability algorithm combined with the high-efficiency shortest path query and other functions of the Neo4j graph database. The effectiveness of the proposed method is verified by the Roy Billinton test system and an actual 10 kV distribution network in China for algorithm verification.