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Power distribution network single-phase earth fault positioning method and system

A single-phase grounding fault, location method technology, applied in fault location, information technology support system, fault detection by conductor type, etc., can solve problems such as difficulty in adapting to the requirements of massive data processing, difficulty in convergence, etc., and the method is simple and easy to implement , the effect of accurate positioning results

Active Publication Date: 2020-07-31
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventor found that although the above-mentioned artificial intelligence algorithm has good fault-tolerant performance and high stability, when the power distribution network is highly complex, it generally has the problem of convergence difficulties, and it is difficult to adapt to the requirements of the current smart grid for processing massive data.

Method used

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  • Power distribution network single-phase earth fault positioning method and system
  • Power distribution network single-phase earth fault positioning method and system
  • Power distribution network single-phase earth fault positioning method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0049] When the medium voltage distribution network is in normal operation state, there is little difference in the operation of each node. Therefore, when clustering analysis is performed on the section information corresponding to each node, it appears as a clustered point in a high-dimensional space. When a fault occurs in a faulty section, compared to non-faulty nodes (NFN, Non-fault node) outside the faulty section, the faulty node (FN, Faultynode) becomes an abnormal point far away from the "class".

[0050] Such as figure 1 As shown, a method for locating a single-phase-to-ground fault in a distribution network in this embodiment includes:

[0051] Step 1: Select the zero-sequence current and negative-sequence current information of the half cycle before and after the fault as the fault characteristic quantity.

[0052] Aiming at the single-phase ground fault with the highest occurrence frequency in the distribution network, combined with the actual operation status o...

Embodiment 2

[0096] This embodiment provides a distribution network single-phase ground fault location system, including:

[0097] (1) Feature quantity selection module, which is used to select the zero-sequence current and negative-sequence current information of half cycles before and after the fault occurs as the fault feature quantity;

[0098]Aiming at the single-phase ground fault with the highest occurrence frequency in the distribution network, combined with the actual operation status of the distribution network, the zero-sequence current and negative-sequence current generated when the single-phase ground fault occurs are selected as characteristic quantities to lay a data foundation for the data processing link .

[0099] (2) a data preprocessing module, which is used to construct a single feature quantity differentiated node matrix from the fault feature quantity based on the distribution network topology;

[0100] The role of the network description matrix is ​​to describe th...

Embodiment 3

[0133] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps in the method for locating a single-phase-to-ground fault in a distribution network as described in Embodiment 1 are implemented.

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Abstract

The invention belongs to the field of power distribution network fault positioning, and provides a power distribution network single-phase earth fault positioning method and system. The method comprises the steps of selecting zero-sequence current and negative-sequence current information of a half cycle before and after a fault occurs as fault characteristic quantities; based on the topological structure of the power distribution network, constructing a single characteristic quantity differential node matrix by the fault characteristic quantity; fusing the fault characteristic quantity in a time domain-space domain to generate a high-dimensional fault information state monitoring matrix expanded by a single characteristic quantity differential node matrix; conducting dimensionality reduction on the high-dimensional state monitoring matrix to a two-dimensional space through a multi-dimensional scale dimensionality reduction method, solving eigenvalues and eigenvectors of the matrix obtained after dimensionality reduction, and obtaining eigenvectors of all sections; and quantizing the correlation of the feature vectors corresponding to the sections to obtain a correlation coefficient matrix, displaying fault nodes and non-fault nodes on a two-dimensional plane based on a DBSCAN clustering model, and positioning fault sections corresponding to the fault nodes.

Description

technical field [0001] The invention belongs to the field of distribution network fault location, in particular to a distribution network single-phase ground fault location method and system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Due to the access of distributed power sources, the single power source structure power supply of the traditional distribution network has become a multi-source network, and the power flow direction has also changed accordingly. In terms of fault line selection, after a single-phase ground fault occurs, the zero-sequence voltage and zero-sequence current have opposite polarities, and the wavelet packet transform is used to multiply the characteristic frequency band components, and the polarity opposite to other lines is the fault line. However, the selection method of wavelet basis functions is empirica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088Y04S10/52
Inventor 穆志军殷红旭吴玉光耿洪彬刘春秀魏燕飞刘杰
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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