Distribution network fault locating method based on transient waveform correlation

A technology for faults and transient waveforms in distribution network, applied in fault location, fault detection according to conductor type, measurement of electricity, etc., can solve problems such as difficulty in effectively and accurately locating fault location, complex topology of distribution network, etc.

Active Publication Date: 2019-12-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0005] To sum up, the distribution network topology is complex and has many branches, and the traditional fault location method based on transient quantities is difficult to

Method used

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  • Distribution network fault locating method based on transient waveform correlation
  • Distribution network fault locating method based on transient waveform correlation
  • Distribution network fault locating method based on transient waveform correlation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1 Analysis of transient waveform characteristics during faults in different locations of distribution network

[0067] 1.1 Analysis of transient traveling wave transmission characteristics

[0068] For a single-ended detection point, the detected transient traveling wave signal is the superposition of each traveling wave according to a certain time sequence after the initial traveling wave at the fault is refracted and reflected at the place where the wave impedance is discontinuous.

[0069] The distribution network has a complex topological structure with many branches, and the line parameters of each branch are also different. When a fault occurs at different locations, the transmission path and refraction of the fault traveling wave are different, and there will be significant differences in the time-domain traveling wave waveform detected by the detection point.

[0070] Formulas (1) and (2) are respectively the voltage refraction coefficient and reflection coeffi...

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Abstract

The invention discloses a distribution network fault locating method based on transient waveform correlation. After a fault occurs, S-transform is carried out on transient waveform information, a time-frequency matrix is constructed, similarity calculation is carried out on the same and time-frequency matrices in all branch sample libraries, and a fault branch is determined according to similarityof an actual fault transient waveform and the branch sample libraries; and a proportional relationship of overall wave amplitude deviation and fault point distance is used to calculate a fault pointlocation. Simulation analysis shows that in different fault conditions, the method can always reliably locate fault point locations, and has higher locating accuracy.

Description

technical field [0001] The invention relates to a method for fault location of distribution network based on transient waveform correlation. Background technique [0002] As a link directly connected with users in the power system, the safe and reliable operation of the distribution network is directly related to the quality of people's production and life. The distribution network topology is complex and has many branches. How to effectively and accurately locate the fault points of the distribution network has become a research hotspot. [0003] The traveling wave method has attracted extensive attention due to its advantages of not being affected by system parameters, transition resistance and system operation mode. The traveling wave positioning method can be divided into single-end method and multi-terminal method in principle. The single-ended method mainly uses the catadioptric characteristics of traveling waves, and realizes fault location according to the time dif...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 李泽文刘基典席燕辉夏云峰何建宗颜勋奇王杨帆
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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