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Cable hybrid line fault distance measuring method for k-NN algorithm based on waveform similarity

A technology for mixing cables and line faults, applied in directions such as fault locations, can solve the problems of complex steps, influence of power supply reliability, and heavy workload, achieving good ranging effect, high ranging result accuracy, and saving investment.

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

AI Technical Summary

Problems solved by technology

Once a failure occurs, it will undoubtedly affect the reliability of power supply
The existing technologies are all based on determining whether the fault location is located in the overhead line section or the cable section before performing fault location. The workload is heavy and the steps are complicated. Therefore, the present invention seeks other perspectives for the single-phase ground fault section of the cable hybrid line. position

Method used

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  • Cable hybrid line fault distance measuring method for k-NN algorithm based on waveform similarity
  • Cable hybrid line fault distance measuring method for k-NN algorithm based on waveform similarity
  • Cable hybrid line fault distance measuring method for k-NN algorithm based on waveform similarity

Examples

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Effect test

Embodiment 1

[0039] Example 1: Now assume that a single-phase grounded metal fault occurs on the main line 8.75km away from the M terminal, the initial phase angle of the fault is 90°, the fault transition resistance is 70Ω, 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

[0040] Embodiment 2: Now assume that a single-phase grounded metal fault occurs on the main line 13.65km away from the M terminal, the initial phase angle of the fault is 60°, the fault transition resistance is 30Ω, 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 diff...

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Abstract

The invention discloses a cable hybrid line 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 cable hybrid line 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 network fault occurs can reduce the workload of manual line inspection, shorten fault repair time, improve power supply reliability, reduce power outage losses, discover hidden dangers and deal with them as soon as possible to prevent reoccurrence 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: single-terminal traveling wave ranging and do...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 束洪春王瑶郑韵如
Owner KUNMING UNIV OF SCI & TECH
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