Reliability Evaluation of Distribution Power System Considering Load Rate and Feeder Connection

With the explosive growth of user-side loads, the traditional distribution network's line load rate has significantly increased, leading to limited capacity for line transfer, posing severe challenges to system reliability. In order to quantitatively analyze the impact of different load rates on the reliability of load electricity supply lines, this paper proposes the concept and definition of transferable electricity coverage rate. Firstly, a complex distribution system reliability calculation model coupled with multiple wiring methods is established. Secondly, a reliability calculation method based on transferable electricity coverage rate is proposed. Finally, a reliability calculation model considering the system bus wiring situation and failure rate is constructed. The effectiveness of the proposed model and algorithm is verified using a typical distribution system, and simulation results show that the reliability calculation method considering feeder load rate can more accurately reflect the current state of system reliability, which is of great significance for guiding the expansion of distribution networks.