Abstract:This paper analyzes the flexible distribution network (FDN), in order to make FDN safe, reliable and stable, it is very difficult to isolate and recover faults when FDN fails. Therefore, it is important to study FDN fault location technology. The practical significance. Firstly, the concept of FDN is analyzed and compared, and the problems existing in the open-loop design mode of the closed-loop design of the traditional distribution network are compared. The basic technology of FDN is combined with the latest research direction, and how the traditional distribution network is transformed into FDN. The paper summarizes the fault location and fault location of the traditional distribution network, analyzes the main research methods involved in fault location and fault location, and studies its application scope, advantages and disadvantages through literature, and proposes corresponding solutions. The recommendations, combined with the above analysis, study the FDN fault location technology and its shortcomings and the main directions to be studied in the future. Finally, the main problems of current flexible distribution network and active distribution network research and the direction of future research are pointed out.