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Power distribution network single-phase ground fault section locating method and power distribution network single-phase ground fault section locating system

A technology for single-phase ground fault and section location, which is applied in the direction of fault location, information technology support system, fault detection according to conductor type, etc., can solve the problems of high operation and maintenance costs, unstructured topology matrix analysis, low efficiency, etc., and achieve Reliable identification, avoiding one-sided fault identification results and insufficient reliability, and reducing time

Active Publication Date: 2019-12-20
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this topological matrix was not analyzed
[0010] (3) The existing short-circuit fault identification algorithm is mainly based on the local fault information of the distribution network substation, which faces great limitations in practical applications. However, if a large amount of waveform data is obtained from the measurement nodes of the distribution network It is directly uploaded to the dispatch center for analysis, the problems of redundancy and low efficiency are obvious, the dispatch center will face massive data, and the operation and maintenance costs are very high

Method used

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  • Power distribution network single-phase ground fault section locating method and power distribution network single-phase ground fault section locating system
  • Power distribution network single-phase ground fault section locating method and power distribution network single-phase ground fault section locating system
  • Power distribution network single-phase ground fault section locating method and power distribution network single-phase ground fault section locating system

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Embodiment 1

[0053] This embodiment provides a method for locating a single-phase-to-ground fault section in a distribution network based on synchronous waveform feature extraction and matrix analysis. Please refer to the attached figure 1 , the method includes the following steps:

[0054] S101, acquiring current waveform data of multiple fault samples at several nodes in the distribution network, and extracting waveform feature quantities of each fault sample at several nodes;

[0055] S102, constructing a topology matrix of each fault sample based on the waveform feature quantities of each fault sample at several nodes;

[0056] S103, calculating the random matrix eigenvalue of each fault sample, and constructing a set of eigenvalues ​​of each fault sample;

[0057] S104, clustering all fault sample eigenvalue sets to obtain the aggregation center point of each fault section;

[0058] S105. Calculate the random matrix eigenvalues ​​of the fault samples to be located, find the cluster ...

Embodiment 2

[0136] This embodiment provides a distribution network single-phase ground fault section positioning system, the system includes several fault recorders installed at each node in the distribution network and a processor arranged in the dispatch center; wherein:

[0137]The fault recorder is used to obtain the current waveform data of multiple fault samples in the distribution network at all nodes, extract the waveform feature quantity of each fault sample at all nodes, and obtain the fault samples to be located at its nodes From the current waveform data at the node, extract the waveform feature quantity of the fault sample to be located at its node;

[0138] The processor is configured to construct a topology matrix of each fault sample based on waveform eigenvalues ​​of each fault sample at all nodes; analyze the topology matrix of each fault sample, and calculate the random matrix eigenvalue of each fault sample, Construct the eigenvalue set of each fault sample; cluster al...

Embodiment 3

[0157] This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are implemented:

[0158] Obtain the current waveform data of multiple fault samples at several nodes in the distribution network, and extract the waveform feature quantity of each fault sample at several nodes;

[0159] Based on the waveform feature quantities of each fault sample at several nodes, construct a topology matrix for each fault sample;

[0160] Calculate the random matrix eigenvalues ​​of each fault sample, and construct a set of eigenvalues ​​for each fault sample;

[0161] Clustering all fault sample eigenvalue sets to obtain the aggregation center point of each fault section;

[0162] Calculate the random matrix eigenvalues ​​of the fault samples to be located, find the cluster center point with the smallest distance from the random matrix eigenvalues ​​of the fault samples to be locate...

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Abstract

The invention discloses a power distribution network single-phase ground fault section locating method and a power distribution network single-phase ground fault section locating system, which realizesection locating for a power distribution network single-phase ground fault. The method comprises the following steps: acquiring current waveform data of a plurality of fault samples in a power distribution network at several nodes, and extracting waveform characteristic quantity of each fault sample at the several nodes; based on the waveform characteristic quantity of each fault sample at the several nodes, constructing a topological matrix of each fault sample; calculating a random matrix characteristic value of each fault sample, and constructing a characteristic value set of each fault sample; clustering all the sample characteristic value sets, and obtaining a clustering center point of each fault section; calculating a random matrix characteristic value of a to-be-located fault sample, searching for the clustering center point from which distance to the random matrix characteristic value of the to-be-located fault sample is lowest, and determining the fault section.

Description

technical field [0001] The disclosure relates to the technical field of distribution network fault diagnosis, in particular to a method and system for locating a single-phase ground fault section of a distribution network based on synchronous waveform feature extraction and matrix analysis. Background technique [0002] The distribution network undertakes the function of distributing the electric energy of the transmission network to power users, which directly affects all aspects of life and production. According to statistics, about 90% of my country's annual blackout losses come from distribution network faults. The problem of distribution network fault diagnosis and location has always been a research hotspot in power systems. my country's medium and low-voltage distribution network mostly adopts ungrounded neutral point or grounding through arc suppressing coil and high impedance. The fault current of single-phase grounding is very weak, and even the compensation curren...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/088Y04S10/52
Inventor 石访张恒旭张林林徐凯韩兴臣孙菊
Owner SHANDONG UNIV
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