With the increasing complexity of distribution network structures originating from the high penetration of renewable energy and responsive loads

fast and accurate fault location technology for distribution networks is a prerequisite for rapid isolation of faults and restoration of the power supply. In this paper

a fault location method based on community graph depth-first traversal is proposed for fast location of single-phase ground faults in distribution networks. First

this paper defines the fault graph weight of the vertices in the distribution network graph model

which can be used to reflect the topology of the vertices and fault points as well as the fluctuation of the vertices' currents. Then

the vertices on the graph model are clustered by using an improved parallel louvain method (IPLM). Finally

the community formed by IPLM is used as the smallest unit for depth-first traversal to achieve fast and accurate location of the fault section. The paper develops a distribution network graph model of IEEE 33-bus system on the graph database for testing. And three other methods are selected for comparison with IPLMDF. The test results show that IPLMDF can achieve fast and accurate fault location when half of the nodes in the distribution network are equipped with D-PMUs. When some of the D-PMUs lose time synchronization

it is still possible to locate the fault section

and at the same time

the locating results can be avoided by falling into local optimal solutions.