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Power grid fault diagnosis method

A diagnostic method and technology for power grid faults, which are applied to fault locations, detect faults according to conductor types, and measure electricity, etc., can solve the problems that power grid fault diagnosis methods rely on switching information and use less electrical information, so as to avoid diagnostic errors, good performance effect

Active Publication Date: 2018-08-17
SIPING POWER SUPPLY COMPANY OF STATE GRID JILINSHENG ELECTRIC POWER SUPPLY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a grid fault diagnosis method, which can effectively solve the problem that the existing grid fault diagnosis methods rely more on switch quantity information and less use of electrical quantity information

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0061] According to the embodiment of the present application, a standard IEEE39 node power system simulation test system is built using PSCAD for simulation experiments.

[0062] In order to check the effectiveness of the present invention, considering the different positions where the fault occurs, the size of the transition resistance, and different fault types have different impacts on the fault diagnosis, the horizontal and vertical differences of each line when various fault situations occur in the line 16-17 are as follows: Table 1 shows.

[0063] Table 1 The horizontal and vertical differences of each line when various types of faults occur on lines 16-17

[0064]

[0065]

[0066] Note: The underlined data indicate a larger degree of abnormality in the normal line.

[0067] In Table 1, lines numbered 16-17 are faulty lines, lines numbered 15-16, 16-19, 16-24, 17-18, 17-27, 3-18 are randomly selected normal lines (the same below ). It can be seen from Table 1 ...

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Abstract

The invention discloses a power grid fault diagnosis method and belongs to the technical field of power grid fault diagnosis. An outage region is obtained through protection and circuit breaker information, lines in the outage region are taken as suspected fault lines, and comprehensive current of the lines is constructed to serve as sample sequences; a DTW algorithm is used, the DTW distance between the sample sequence of each suspected fault line and a reference sequence of a reference line outside the outage area is obtained, and transverse difference degrees are constructed; meanwhile, theDTW algorithm is used for solving the DTW distance between the sample sequences of the suspected fault lines before and after faults, and longitudinal difference degrees are constructed. The transverse and longitudinal difference degrees of the N suspected fault lines form a 2*N difference degree matrix; clustering is carried out on the matrix by utilizing an artificial fish swarm clustering algorithm, the matrix is divided into a fault class and a normal class, the class with a larger clustering center value is diagnosed as the fault class, and the lines in the fault class are judged to be the fault lines. By means of the method, the fault lines can be accurately diagnosed, the influence of fault positions, transition resistance, fault types and the like is avoided, and the performance is good.

Description

technical field [0001] The invention belongs to the technical field of grid fault diagnosis. Background technique [0002] After decades of continuous development in the related research on power grid fault diagnosis, experts and scholars at home and abroad have put forward many new theories, such as neural network, expert system, Petri net, rough set, etc. Most of these methods rely on protection, circuit breaker Act correctly or receive a complete warning message. When a relatively complex fault occurs in the system or the relevant alarm information is lost in the upload, it may affect the accuracy of the diagnosis result. [0003] However, with the application of new technologies in the power grid, the collection of electrical quantities is becoming more and more convenient. Using the rich information contained in the electrical quantities for fault diagnosis has become a hot spot in the research of grid fault diagnosis. At the same time, electrical quantity information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 童晓阳梁晨
Owner SIPING POWER SUPPLY COMPANY OF STATE GRID JILINSHENG ELECTRIC POWER SUPPLY
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