A Radiation Network Fault Branch Identification Method Based on Full Coverage of Voltage Distribution and Traveling Wave Information Along the Line

A technology of voltage distribution and radiation network, applied in the fault location and other directions, can solve the problems of the difficulty of identifying, distinguishing and locating the reflected wave at the fault point, and the large attenuation of the initial traveling wave of the fault.

Active Publication Date: 2019-01-04
KUNMING UNIV OF SCI & TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large attenuation of the initial traveling wave in the multi-branch radiation network, the disparity in the length of the branch lines leads to the disorder of the follow-up wave head and other factors, the reflected wave at the fault point is not easy to identify from many reflected waves, so that the time-domain traveling wave head is used to detect the fault section. The methods of discrimination and localization are affected to a certain extent

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Radiation Network Fault Branch Identification Method Based on Full Coverage of Voltage Distribution and Traveling Wave Information Along the Line
  • A Radiation Network Fault Branch Identification Method Based on Full Coverage of Voltage Distribution and Traveling Wave Information Along the Line
  • A Radiation Network Fault Branch Identification Method Based on Full Coverage of Voltage Distribution and Traveling Wave Information Along the Line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] use as figure 1 The topology of the multi-branch radial power distribution network with multi-outlet wiring is shown, the measurement end is located at the head end M, and the healthy line L 4 = 48km, L 5 = 4km. Assume that the line MN is composed of trunk 1, trunk 2, trunk 3, branch 1 and branch 2, and the line lengths are L 1 =20km, L 2 = 15km, L 3 = 15km, L 6 = 10km, L 7 = 10km. Assuming that a phase A ground fault occurs at a distance of 26km from the M terminal within the half-line length of the trunk 2 (that is, 6km away from node B), first use PCA-SVM to identify that the fault is located in the cut set 2, and then in [k 0 ,k 0 +L 1 / (2v)] and [k 0 +L 1 / (2v),k 0 +L 1 / v] time window, using the line-mode current traveling wave and line-mode voltage traveling wave at the measurement end of trunk 1, the calculation step along the line is 0.1km, and the ranging function f of the measurement end M is calculated according to the transmission equation of t...

Embodiment 2

[0054] use as figure 1 The topology of the multi-branch radial power distribution network with multi-outlet wiring is shown, the measurement end is located at the head end M, and the healthy line L 4 = 48km, L 5 = 4km. Assume that the line MN is composed of trunk 1, trunk 2, trunk 3, branch 1 and branch 2, and the line lengths are L 1 =20km,L 2 = 15km, L 3 = 15km, L 6 = 10km, L 7 = 10km. Now suppose that when the phase A ground fault occurs at a distance of 45km away from the M terminal beyond the half-line length of the trunk line 3 (that is, 10km away from the C node), the PCA-SVM is first used to identify the fault location in the cut set 3, and then the faults are located in the [k 0 ,k 0 +L 1 / (2v)] and [k 0 +L 1 / (2v),k 0 +L 1 / v] time window, using the line-mode current traveling wave and line-mode voltage traveling wave at the measurement end of trunk 1, the calculation step along the line is 0.1km, and the ranging function f of the measurement end M is ca...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a radial network fault branch identification method based on voltage distribution along a line and full coverage of travelling wave information, and the method belongs to the technical field of relay protection of power systems. According to the invention, when a single-phase earth fault happens in a multi-branch radial distribution network, PCA-SVM is used to identify a cut set in which a fault branch of the multi-branch radial distribution network is. In the cut set, a line-model travelling wave is calculated from fault travelling wave data obtained from a measurement terminal of a trunk 1. According to the Bergeron line transmission equation, the obtained line-model travelling wave is used to calculate voltage travelling wave and current travelling wave distribution along a line, a voltage travelling wave along the line and a current travelling wave along the line are subjected to travelling wave decomposition along the direction of the line, and a direction travelling wave distributed along the line is obtained. A distance measurement function is constructed by multiplying a forward travelling wave with an opposite travelling wave and calculating integration in two successive time windows separately, and the length of each time window is L1 / (2v). Finally, the fault branch in the multi-branch radial distribution network is identified according to the travelling wave distribution of the distance measurement function in a line length L1 range. Theoretical analysis and simulation results indicate that the method has a good effect.

Description

technical field [0001] The invention relates to a radiation network fault branch identification method based on voltage distribution along the line and full coverage of traveling wave information, and belongs to the technical field of electric power system relay protection. Background technique [0002] The fast and accurate location of distribution line faults, especially single-phase ground faults, is very important to ensure the safe, stable and economical operation of the entire power system. The distribution network generally adopts a radial structure with many line branches. How to accurately identify the fault branch of the radial network is a major difficulty in fault location of distribution lines. The S-injection method is a signal-increased diagnosis method that detects the path and characteristics of the injected signal to identify the fault branch and locate the fault point. However, the injected signal is limited and is greatly affected by the distributed capac...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 束洪春余多田鑫萃高利
Owner KUNMING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap