Research On Fault Self-healing Method Of Distribution Network Based On Hierarchical Structure Model

As the terminal link of power transmission in the power system,the distribution network is directly connected with users and is closely related to the production and life of the broad masses of people.Improving the power supply reliability of the distribution network,improving the user’s power experience,ensuring that the system can locate the fault area,isolate the fault range in a very short time when a fault occurs,and formulate a power supply restoration plan is the focus of current research by power researchers problem.This paper mainly studies the fault location and power supply restoration technology of the distribution network.As the core of distribution automation,the location and isolation of fault areas in the distribution network and the restoration of power supply in non-faulty areas are the main functions of the distribution network’s fault self-healing.this paper summarizes and analyzes the current fault location and recovery aspects of the distribution network.Related algorithms.On this basis,combined with the "closed-loop design and open-loop operation" characteristics of the distribution network,the knowledge of graph theory is further introduced into the fault location and recovery process,and a hierarchical structure tree model is established according to the topological structure of the distribution network.A new algorithm for fault location in distribution network is proposed,which makes the algorithm criterion simple,fast and intuitive in the process of fault finding,avoids high-order matrix calculations,and reduces the pressure of calculation and data storage.In the process of fault location,the Algorithm in this paper only uses the key node information in the network to perform the location operation,and automatically omits the search of the non-fault level.Through performance analysis of the algorithm,and comparison with other algorithms,the algorithm is in terms of complexity.It has certain advantages,especially suitable for radial distribution network with many nodes.In addition,the location algorithm based on graph theory algorithm proposed in this paper requires high accuracy for the fault information uploaded by the field terminal.For this reason,this paper further analyzes the fault tolerance of the proposed method,and analyzes the algorithm when the fault information is missing or distorted.Time-to-time fault tolerance,and establish an error correction mechanism accordingly to improve the accuracy of the algorithm.Finally,from the perspective of the safe and stable operation of the power grid,the improvement of the reliability of the power supply of the power grid,and the improvement of customer satisfaction,this article aims to restore as many non-faulty area loads as possible,and integrates the backup capacity,equipment parameters,equipment operation accounts,operation and maintenance data and the nature of the load,proposes a concept based on the reliability coefficient of the transfer power supply,designs a heuristic hierarchical recovery algorithm based on the reliability of the transfer power supply,and some feeders of Guangzhou Distribution Network and their operation and maintenance data are selected to verify the results.