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An automatic screening method for fault data based on power frequency sinusoidal fitting correlation coefficient

A technology of sinusoidal fitting and fault data, applied in the direction of fault location, etc., can solve the problem of lack of effective automatic identification method of fault modal data, and achieve the effect of high accuracy

Active Publication Date: 2017-09-12
DALI POWER SUPPLY BUREAU YUNNAN POWER GRID +1
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the current lack of effective fault mode data automatic discrimination method in the field, and propose a fault data automatic screening method based on power frequency sinusoidal fitting correlation coefficient

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  • An automatic screening method for fault data based on power frequency sinusoidal fitting correlation coefficient
  • An automatic screening method for fault data based on power frequency sinusoidal fitting correlation coefficient
  • An automatic screening method for fault data based on power frequency sinusoidal fitting correlation coefficient

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Embodiment 1

[0058] The fault current data recorded by the traveling wave distance measuring device is divided into three sections, and the power frequency sinusoidal fitting and cross-correlation coefficient calculation are performed on the three sections of data respectively. According to the power frequency sinusoidal fitting amplitude and cross-correlation coefficient of the three sections of data Calculate the modal eigenvalues ​​of the data. If the calculated modal eigenvalues ​​of the data are greater than the set threshold, it is judged to be fault initial modal data containing valid information, and thus is screened out; otherwise, it is eliminated.

[0059] Such as figure 1 As shown in the initial fault mode data waveform, the fault current data recorded by the traveling wave distance measuring device is divided into three sections, and the waveforms of the three sections of data are respectively fitted by the sinusoidal fitting method, and the power frequency sinusoidal fitting e...

Embodiment 2

[0066] The fault current data recorded by the traveling wave distance measuring device is divided into three sections, and the power frequency sinusoidal fitting and cross-correlation coefficient calculation are performed on the three sections of data respectively. According to the power frequency sinusoidal fitting amplitude and cross-correlation coefficient of the three sections of data Calculate the modal eigenvalues ​​of the data. If the calculated modal eigenvalues ​​of the data are greater than the set threshold, it is judged to be fault initial modal data containing valid information, and thus is screened out; otherwise, it is eliminated.

[0067] Such as image 3 As shown in the fault stability mode data waveform, the fault current data recorded by the traveling wave distance measuring device is divided into three sections, and the waveform fitting of the three sections of data is carried out by using the sinusoidal fitting method, and the power frequency sinusoidal fit...

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Abstract

The invention relates to an automatic fault data screening method based on power frequency sinusoidal fitting correlation coefficient, which belongs to the technical field of electric power system relay protection. The fault current data recorded by the traveling wave distance measuring device is divided into three sections, and the power frequency sinusoidal fitting and cross-correlation coefficient calculation are performed on the three sections of data, and then the amplitude and mutual relationship are fitted according to the power frequency sinusoidal of the three sections of data If the calculated data modal eigenvalue is greater than the set threshold, it is judged to be fault initial modal data containing valid information; otherwise, it is non-fault initial modal data. Theoretical analysis and verification of measured data show that the present invention can realize the correct judgment of the data mode, and the effect of screening the initial fault mode data is good.

Description

technical field [0001] The invention relates to an automatic fault data screening method based on power frequency sinusoidal fitting correlation coefficient, which belongs to the technical field of electric power system relay protection. Background technique [0002] With the widespread application of traveling wave ranging devices on 220kV and above voltage level transmission lines, a large number of fault measurement data have been recorded. In order to record as much as possible the whole process of fault occurrence, the traveling wave distance measuring device records the fault initial mode, fault stable mode and fault removal mode data. In addition, the existing traveling wave distance measuring devices generally start with a low-threshold mutation, which not only ensures reliable startup for weak faults, but also allows a large number of non-fault interference clutter to be recorded, which makes it difficult to effectively screen fault data. The main information neede...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 张可张凌杨文波徐韬赵宇马恩宁李宏斌段晓雪束洪春白冰余多
Owner DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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