Method for locating power distribution network 10kV feeder line fault based on matrix operation

A technology of fault location and matrix operation, applied in the direction of fault location, etc., can solve problems such as fault location at the end of the feeder

Inactive Publication Date: 2014-02-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the method of the present invention, the feeder fault location of the distribution network is realized, the judgment principle is simple an...

Method used

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  • Method for locating power distribution network 10kV feeder line fault based on matrix operation
  • Method for locating power distribution network 10kV feeder line fault based on matrix operation
  • Method for locating power distribution network 10kV feeder line fault based on matrix operation

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Experimental program
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Effect test

Embodiment 1

[0029] The following are the implementation steps for locating faults in general areas of feeders in distribution networks using matrix operations.

[0030] (1) Use depth-first search method to figure 2 Numbering the switch nodes in, starting from the power point, first search for the first switch sub-node adjacent to it, numbered 1, there are two switch sub-nodes adjacent to node 1, visit one of the switch sub-nodes The node number is 2 and the depth-first search is continued, and the child node of node 2 is visited and numbered 3, until the load node is visited, and the power supply path 1 is composed of the node set [1,2,3]; the power supply path 1 search After finishing, go back to node 1, visit another child node of node 1 and numbered 4,..., continue to visit and search until all the nodes in the figure that have a path to the power node have been searched, and the power supply path is obtained 2 is composed of nodes [1,4,5,6,7,8], power supply path 3 is composed of nodes...

Embodiment 2

[0041] The following are the implementation steps for locating faults at the end of a feeder line in a distribution network using matrix operations.

[0042] (1) Assumption attached figure 2 The fault in the distribution network is located at the end of the feeder after node 3, and the FTU at each node is operating normally. The steps of forming the feeder power supply path matrix H and the modified path matrix H′ of the distribution network in the positioning process are the same as those in the first embodiment, and will not be repeated here.

[0043] (2) FTU detects that there are fault currents flowing through nodes 1, 2, and 3, and the elements in columns 1, 2, and 3 in the modified path matrix H'remain unchanged; other nodes have no fault current flowing, and the other nodes in the modified path H' All elements in the column are set to 0, and the initial judgment matrix P'is obtained:

[0044] P ′ = 1 1 1 0 0 0 0 0 0 0 0...

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Abstract

The invention discloses a method for locating a power distribution network 10kV feeder line fault based on matrix operation, and belongs to the technical field of power distribution network automation. The technical problem to be solved is the fault locating of a power distribution network medium voltage 10kV feeder line. The method comprises the steps that a power distribution network initial power supply path matrix H is formed according to the topological structure of the power distribution network feeder line, the H is amended to obtain an amended path matrix H' so as to solve the problem of repeated fault locating, fault information is obtained through an FTU, operation processing is carried out on the amended path matrix H' according to the fault information, then an initial judgment matrix P' is formed, a fault judgment matrix P is finally obtained, father nodes in a fault area can be judged effectively according to coherent elements in the P, and then the fault area is obtained. By means of the method, the power distribution network feeder line fault is located, the judgment principle is simple and effective, no complex matrix multiplication operation is required, and the aim of locating feeder line tail end faults can be well achieved.

Description

Technical field [0001] The invention belongs to the field of distribution network automation, and relates to a new method for locating a 10kV feeder fault in a distribution network based on matrix operation. Background technique [0002] An important function of the distribution automation system is feeder automation, and the main function of feeder automation is to accurately locate faults, quickly isolate faulty areas and restore power to non-faulty areas. At present, the existing fault location principles and methods can be divided into three categories: one is the fault location method for measuring the fault distance at the end of the line; the other is the fault location method by injecting a specific signal into the system after a fault occurs. Trace signal injection method; there is another type of fault section location method to determine the fault section based on the fault information (usually overcurrent information) provided by the feeder terminal unit (FTU) install...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 江亚群于浩明黄纯杜立新罗勋华
Owner HUNAN UNIV
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