Power distribution network grounding fault positioning method and device based on node comprehensive injection current

Abstract

The invention discloses a power distribution network grounding fault positioning method and device based on node comprehensive injection current. The method comprises the steps of taking each branch point and a network tail end in a power distribution network as nodes, and dividing a line between any two adjacent nodes into a section, calculating the voltage of each branch point on the calculationpath of the measuring point and the section by utilizing the zero-mode voltage and the zero-mode current detected by each measuring point at the tail end of the network so as to obtain the zero-modecurrent of all branch lines, calculating node injection current by utilizing the calculated zero-mode current and measurement current, obtaining a node comprehensive injection current based on the multi-moment measurement data, and finally, taking the section corresponding to the minimum value of the sum of the comprehensive injection currents of the output nodes as a fault section. Thus, under the scene that the measuring point is locally limited, non-blind area positioning of the grounding fault section can be realized, the positioning accuracy of the fault section is not influenced by a neutral point grounding mode, transition resistance and a fault initial phase angle, and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of location of distribution network fault sections, and more specifically relates to a distribution network ground fault location method and device based on node integrated injection current. Background technique [0002] There are many branch nodes in the distribution network, and the branch points divide the feeder into multiple sections, and the section location is to determine the section where the fault point is located. Fault section location is the premise of precise fault location, and it is also the key to fault isolation and power restoration in non-faulty areas. Therefore, it is of great practical significance to carry out research on the fault location of distribution network. [0003] Existing distribution network fault section location methods mainly include matrix method, artificial intelligence method and zero-mode current detection feature method; matrix method and artificial intelligence m...

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Problems solved by technology

[0005] Aiming at the defects and improvement needs of the prior art, the present invention provides a distribution network ground fault location method and device based on node comprehensive injection current, aiming at solving the problem that the existing distribution network ground fault location method assumes that the measuring points are completely However, due to the limitation of the space and force of the tower, usually the measuring points can only be arranged at the end of the network and some branch points, which causes the technical problem of inaccurate ground fault location

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