Lightning strike interference and fault identification method based on pso improved atomic decomposition method

A technology of atomic decomposition and fault identification, applied to fault locations, instruments, measuring devices, etc., can solve problems such as high-frequency transient protection interference

Active Publication Date: 2017-05-03
WUHAN UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When there is no fault on the lightning strike line, the transient traveling wave generated by the lightning strike line contains a large number of high-frequency components, and more high-frequency components will be superimposed after refraction and reflection at the discontinuous point of the line wave impedance, and this high-frequency component will be Interference with high frequency transient protection

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  • Lightning strike interference and fault identification method based on pso improved atomic decomposition method
  • Lightning strike interference and fault identification method based on pso improved atomic decomposition method
  • Lightning strike interference and fault identification method based on pso improved atomic decomposition method

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Embodiment

[0038] It should be noted that the PSO-based improved atomic decomposition method used in the present invention is derived from: Application of PSO-based atomic decomposition method in interharmonic analysis [J]. Power System Protection and Control, 2013, 41(15 ):41-48.

[0039] Below is the step that adopts the specific embodiment of the present invention, as follows:

[0040] 1. Data acquisition to obtain the voltage and current signals at the protected installation of the detected line

[0041] According to the current and voltage digital signals collected by the sampling card, it is judged whether there is a fault in the line. The criterion for whether a fault occurs in the present invention is: compare the calculated value of the zero-sequence voltage of the system with the set value of the zero-sequence voltage, and if the calculated value of the zero-sequence voltage is greater than the set value of the zero-sequence voltage, it is considered that a fault has occurred....

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Abstract

The invention relates to a lightning interference and lightning fault identification method, particularly to a PSO (Particle Swarm Optimization) improved atomic decomposition method based lightning interference and fault identification method. The frequency component analysis is performed on voltage and current signals formed at the fault line protection installation position by an atomic decomposition method, a lightning interference identification method based on the existence of a zero sequence current steady state power frequency component is proposed, double fault type identification criterions based on the current line mold component atomic decomposition energy ratio and the fault phase current electromagnetic transient characteristics are proposed, and accordingly the accuracy of fault identification is improved. According to the PSO improved atomic decomposition method based lightning interference and fault identification method, optimal match atoms and parameters of the atoms of signals are self-adaptively found on the basis of an over-complete redundant atom library and accordingly the adaptive expression of the signals can be simple, the decomposition result can be sparse, the information density and the use flexibility are greatly improved, and the processing cost is reduced.

Description

technical field [0001] The invention relates to a lightning strike interference and lightning strike fault identification method, in particular to a lightning strike interference and lightning strike fault identification method using an improved atomic decomposition method based on PSO. Background technique [0002] Lightning protection of transmission lines is of great significance to the safe and stable operation of power systems. According to theoretical analysis and actual operation experience, people have summed up various comprehensive lightning protection measures, such as improving the insulation level of lines, reducing the grounding resistance of towers, erecting lightning protection lines, and adopting negative protection angles. Although the lightning protection characteristics of the line have been improved overall through these measures, the lightning protection situation of the power system is still severe because people cannot accurately determine the cause o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 龚庆武占劲松纪磊
Owner WUHAN UNIV
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