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OPLC Fault Location Method Based on DS Evidence Theory

A fault location and evidence theory technology, applied in complex mathematical operations and other directions, can solve the problem of difficult choice for location detection operators, and achieve the effect of reducing uncertainty and improving accuracy

Inactive Publication Date: 2021-04-30
NORTHEAST DIANLI UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the situation where the cable and the optical cable fail at the same location at the same time, the results obtained by using the cable and the optical cable respectively often have certain differences, which makes it difficult for the positioning detection operator to make a choice

Method used

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  • OPLC Fault Location Method Based on DS Evidence Theory
  • OPLC Fault Location Method Based on DS Evidence Theory
  • OPLC Fault Location Method Based on DS Evidence Theory

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Experimental program
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Embodiment Construction

[0066] The steps of the present invention are:

[0067] Step 1: Use cables and optical cables to locate faults, obtain location results, and judge whether the location difference is less than a certain threshold d. If so, use this method to improve location accuracy.

[0068] Step 101: This step is a one-time operation and does not need to be performed before each positioning. Take several OPLC samples, set up faults at different locations, use the same type of OPLC detection device to detect the cables and optical cables in the OPLC respectively, statistically analyze the sample data, and obtain the probability density distribution of their respective measurement values.

[0069] Step 102: subtracting the known fault location from the measured data to obtain the respective measurement error distributions

[0070] f d (x,y)=Z d +w d (x,y) (1)

[0071] w d (x,y)=f d (x,y)-Z d (2)

[0072] Among them, f d (x, y) is the distribution of measured value of cable measureme...

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Abstract

An OPLC fault location method based on DS evidence theory belongs to the technical field of smart grid detection. The purpose of the present invention is to use the DS evidence theory to fuse the confidence degree when the cable and the optical cable fail at the same place at the same time, and the confidence degree obtained after fusion is the most likely fault position at the peak of the OPLC fault location method based on the DS evidence theory . The present invention utilizes cables and optical cables to locate faults to obtain positioning results, uses cable detection and optical cable detection to measure OPLC fault locations, obtains their respective true value distributions, and performs confidence data fusion according to DS evidence theory to obtain fault location intervals. The DS evidence theory fusion method of the present invention can solve the inconsistency of the positioning results of the cable and the optical cable due to positioning errors when the cable and the optical cable fail simultaneously at the same location, and the cable or optical cable alone cannot accurately determine the location of the fault. The difficult decision-making problems brought by personnel can effectively improve the accuracy of OPLC fault location in this case. And can greatly reduce the uncertainty of judgment.

Description

Technical field: [0001] The invention belongs to the technical field of smart grid detection. Background technique [0002] Optical Fiber Composite Low-Voltage Cable (OPLC) is a low-voltage power cable and optical unit composite cable, which can provide power and information transmission at the same time. It is suitable for rated voltages of 0.6kV / 1.0kV and below Voltage level. OPLC enables the complex engineering of multiple lines such as electric wires, network cables, telephone lines, and cable TV lines that originally needed to be laid into an integrated construction, which simplifies the installation process and greatly saves line resources and pipeline resources. At the same time, it has informationization, The advantages of automation and interaction will undoubtedly become the mainstream terminal products of "smart grid", which can bring more convenience and modern life style to users. figure 1 It is a typical structure of OPLC. [0003] In practical engineering a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/18
CPCG06F17/18
Inventor 王鹤熊宇昂葛维春李国庆郭昆亚王振浩罗恒恒周桂平邓伟孔祥余王英杰
Owner NORTHEAST DIANLI UNIVERSITY