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Multi-outgoing-line radiation network fault distance measuring method for k-NN algorithm based on waveform similarity

A technology of fault distance measurement and similarity, which is applied in the direction of fault location, measuring electricity, measuring devices, etc., to achieve the effect of high precision and saving investment

Active Publication Date: 2014-07-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a waveform similarity-based k -The multi-outlet radial network fault location method of NN algorithm only uses the amount of single-ended information to overcome the problem that double-ended ranging requires data synchronization on both sides

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  • Multi-outgoing-line radiation network fault distance measuring method for k-NN algorithm based on waveform similarity
  • Multi-outgoing-line radiation network fault distance measuring method for k-NN algorithm based on waveform similarity
  • Multi-outgoing-line radiation network fault distance measuring method for k-NN algorithm based on waveform similarity

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Embodiment 1

[0044] Example 1: Now assume that a single-phase grounded metal fault occurs on the main line 37.55km away from the M terminal, the initial phase angle of the fault is 90°, the fault transition resistance is 5Ω, the simulation sampling frequency is 1MHz, and the zero mode collected by the distance measuring device at the M terminal is used The current waveform, the wavelet coefficient waveform obtained after wavelet decomposition and reconstruction, and the wavelet coefficient waveform under different fault conditions in the simulated historical samples are calculated using the correlation analysis formula (1), and the first three similarities are obtained. The fault distance corresponding to the waveform data. Defining weights for waveform similarity-based fault locating D To use correlation analysis to measure the similarity of two signals. According to the fault distance represented by the first three waveform data with the highest similarity and combined with its differen...

Embodiment 2

[0045] Embodiment 2: Now assume that a single-phase grounded metal fault occurs on the line where branch 1 is 20.35km away from the M terminal, the initial phase angle of the fault is 80°, the fault transition resistance is 40Ω, the simulation sampling frequency is 1MHz, and the distance measurement device at the M terminal is used to collect The zero-mode current waveform, the wavelet coefficient waveform obtained after wavelet decomposition and reconstruction, and the wavelet coefficient waveform under different fault conditions in the simulated historical samples are calculated using the correlation analysis formula (1), and the first three similarities are obtained The fault distance corresponding to the highest waveform data. Defining weights for waveform similarity-based fault locating D In order to use correlation analysis to measure the similarity of two signals. According to the fault distance represented by the first three waveform data with the highest similarity a...

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Abstract

The invention relates to a multi-outgoing-line radiation network fault distance measuring method for a k-NN algorithm based on waveform similarity, and belongs to the technical field of power system relay protection. Zero-mode current data of a measuring side at different fault positions and under different fault conditions are acquired through simulation, wavelet decomposition is carried out on the data, and wavelet coefficient organization historical sample data under a sixth scale are obtained. When a single-phase grounding fault occurs, the k-NN algorithm is utilized, similarity matching is carried out on a wavelet coefficient waveform of measured zero-mode current waveforms after wavelet decomposition and wavelet coefficient waveforms in a simulated historical sample under the different fault conditions through correlation analysis, fault distances corresponding to the first three waveform data with the highest similarity are obtained, and the fault distance is obtained through the different application regression methods of weights. A large amount of simulation shows that the method is reliable and high in precision for the single-phase grounding fault.

Description

technical field [0001] The invention relates to a waveform similarity-based k The invention relates to a multi-outlet radiation network fault location method based on NN algorithm, which belongs to the technical field of electric power system relay protection. Background technique [0002] Fault location after a fault occurs in the power grid can reduce the workload of manual line inspection, shorten the fault repair time, improve the reliability of power supply, reduce the loss of power outage, and find hidden dangers and deal with them as soon as possible to prevent the recurrence of faults. The method of fault location can be divided into fault analysis method and traveling wave method according to the principle of distance measurement. The core of the traveling wave method is to measure the propagation time of the traveling wave between the bus and the fault point to calculate the line fault distance. Traveling wave ranging can generally be divided into two types: sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 束洪春王瑶林丹丹
Owner KUNMING UNIV OF SCI & TECH
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