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Active traveling wave location method and system for distribution network faults based on multiple sampling points

A traveling wave positioning, multi-sampling point technology, applied in the fault location, detecting faults according to conductor types, etc., can solve the problems affecting the identification of reflected waves, and achieve the effect of providing measurement accuracy and reliability

Active Publication Date: 2021-04-30
HAIBEI POWER SUPPLY COMPANY STATE GRID QINGHAI ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem that discontinuities in distribution network characteristic impedance affect reflected wave identification, a reflected wave identification method using multi-point data through line structure recursion is proposed.

Method used

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  • Active traveling wave location method and system for distribution network faults based on multiple sampling points
  • Active traveling wave location method and system for distribution network faults based on multiple sampling points
  • Active traveling wave location method and system for distribution network faults based on multiple sampling points

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Please also see figure 1 , Figure 1a and Figure 1b , figure 1 It is a schematic flowchart of an active traveling wave location method for distribution network faults based on multiple sampling points (hereinafter referred to as "active traveling wave location method") in Embodiment 1 of the present invention. Figure 1a It is a schematic diagram of the principle of an active distribution network fault location algorithm based on multi-point sampling provided by Embodiment 1 of the present invention. Figure 1b It is a schematic diagram of reflected wave types collected at the beginning of the line provided by Embodiment 1 of the present invention.

[0087] Such as figure 1 As shown, the moving wave location method includes the following steps:

[0088] S101. Set to actively inject an initial traveling wave signal.

[0089] In one embodiment, if a permanent fault occurs in the line of the distribution network, the user can manually turn on and install a section s...

Embodiment 2

[0113] Please also see Figure 1a and figure 2 , figure 2 It is a schematic flowchart of an active traveling wave location method (hereinafter referred to as "active traveling wave location method") based on multi-sampling point distribution network faults provided by Embodiment 2 of the present invention. Wherein, for S101-S105, please refer to Embodiment 1.

[0114] Such as figure 2 As shown, the active traveling wave positioning method includes the following steps:

[0115] S107. When the amplitude of the initial traveling wave signal is low or the number of branch lines is too large;

[0116] Select the nearest sampling point from the fault point SB to be the updated line start, and the updated line start is the farthest sampling point from the line start;

[0117] Eliminate the influence of reflected waves at each sampling point along the line between the beginning of the line and the beginning of the updated line by elimination;

[0118] Select the reflected wav...

Embodiment 3

[0120] see image 3 , image 3 It is a schematic block diagram of an active traveling wave location system based on multi-sampling point distribution network faults (hereinafter referred to as "active traveling wave location system") provided by Embodiment 3 of the present invention. Such as image 3 As shown, the active traveling wave positioning system 300 includes:

[0121] Injection module 310, the injection module 310 actively injects the initial traveling wave signal;

[0122]Screening module 320, the screening module 320 generates corresponding reflected waves respectively after the initial traveling wave signal passes through one of the multi-sampling points and the fault point, each sampling point corresponds to its branch route, wherein, the screening module 320 according to the The ratio of the amplitude and the amplitude of the reflected wave screens out the number of branch lines, and the branch lines include the terminal and the main line end;

[0123] Calcul...

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Abstract

The invention provides an active traveling wave location method for distribution network faults based on multiple sampling points. The active traveling wave positioning method includes: setting the active injection of the initial traveling wave signal; obtaining the corresponding reflected waves generated by the initial traveling wave signal passing through one of the multi-sampling points and the fault point, and each sampling point corresponds to its branch route, wherein, According to the ratio of the amplitude of the initial traveling wave signal and the amplitude of the reflected wave, the number of branch lines is screened out. The branch lines include the end and the main line end; according to the end of the branch line, the main line end and the beginning of the line at each sampling point and the fault The reflected wave at the point end calculates the distance set matrix between each sampling point and the beginning end of the line and the fault point end, and performs column calculation on the distance set matrix to locate the distance between the main line end and the fault point end. The active traveling wave positioning method provided by the present invention provides measurement accuracy and reliability through multiple measurements.

Description

technical field [0001] The invention relates to the technical field of electric power system automation, in particular to an active traveling wave location method and system based on multi-sampling point distribution network faults. Background technique [0002] my country's medium and low voltage distribution network generally adopts the operation mode of ungrounded neutral point or grounded through arc suppressing coil (called small current grounding system). The low-current grounding system has high power supply reliability and can continue to operate for a certain period of time after a fault. However, due to the small fault current, it is difficult to locate the fault. [0003] At present, the research in the field of distribution network fault location is mainly based on steady-state quantities, using fault indicators or distribution network automation terminal data to complete the fault section (fault branch) location. The main problem of fault location in the existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 牛燕雄郭宁明高继宏马玉龙汪丰福刘丰年孙芝莲范海燕甘雯刚存军李小晖
Owner HAIBEI POWER SUPPLY COMPANY STATE GRID QINGHAI ELECTRIC POWER