Low-voltage power distribution network fault positioning method based on adjacent matrix shortest path

Abstract

The invention provides a low-voltage power distribution network fault positioning method based on an adjacent matrix shortest path. A traditional intelligent positioning algorithm is improved, a graphtheory principle is combined, and a fault current monitoring unit installed at the head end of each feeder line section is used for generating an adjacent matrix of a low-voltage power distribution network; a path of the estimated fault current is generated according to the estimated fault current connectivity in the fault state of the estimated section, and a shortest path estimation method is proposed to generate an estimated fault monitoring information matrix; and the iterative search is performed by using a particle swarm algorithm, and estimated fault information most similar to the actual fault information is found as a fault positioning result. According to the method, the accuracy of fault positioning of the low-voltage active power distribution network is effectively ensured, the interference of non-fault area monitoring information on fault positioning is suppressed, the reliability of the low-voltage power distribution network is improved, and the method has important theoretical and practical application values.

Description

technical field [0001] The invention belongs to the technical field of low-voltage distribution network fault location, in particular to a low-voltage distribution network fault location method based on the shortest path of an adjacency matrix. Background technique [0002] With the gradual increase of electricity load and the large-scale access of distributed power generation (DG) to the power grid, the structure and flow of the power distribution system tend to be multi-branched and complex. At the same time, users' requirements for power supply reliability are also increasing. The fault location of the power grid has gradually attracted the attention of researchers. At present, the fault location methods used in distribution network include: 1) matrix method, which establishes the description matrix of distribution network topology map, and forms a fault discrimination matrix in combination with the fault information matrix, but the matrix method has a large calculation d...

AI Technical Summary

Problems solved by technology

However, because the low-voltage distribution network has many branches, small power supply radius, and complex topological structure, most of the existing fault location methods calculate the estimated states of fault monitoring units one by one according to the switching function, and the location efficiency is low. Depending on the topology, applicability is limited

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