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Fault line selection method with improved oscillator system

A fault line selection and subsystem technology, applied to fault locations, measuring devices, instruments, etc., can solve problems such as difficulty in fault line selection

Inactive Publication Date: 2014-07-02
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the difficulty of fault line selection under the background of strong noise, and to invent a fault line selection method using an improved vibrator system

Method used

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  • Fault line selection method with improved oscillator system
  • Fault line selection method with improved oscillator system
  • Fault line selection method with improved oscillator system

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Embodiment

[0154] The present invention utilizes ATP to do single-phase grounding simulation test, simulation model such as Figure 9 shown, where line S 1 , S 2 It is an overhead line with the lengths of 13.5km and 24km respectively; line S 3 It is a cable-wire hybrid line, in which the length of the cable line is 5km, and the length of the overhead line is 12km; the line S 4 It is a cable with a length of 10km. The specific electrical parameters of the model are as follows:

[0155] Line: Overhead line positive sequence parameter R 1 =0.17Ω / km, L 1 =1.2mH / km, C 1 =9.697nF / km; zero sequence parameter R 0 =0.23Ω / km, L 0 =5.48mH / km, C 0 =6nF / km. Cable line positive sequence parameter R 11 =0.193Ω / km, L 11 =0.442mH / km, C 11 =143nF / km; zero sequence parameter R 00 =1.93Ω / km, L 00 =5.48mH / km, C 00 =143nF / km. Transformer: 110 / 10.5kV; high-voltage side single-phase neutral point coil resistance 0.40Ω, inductance 12.2Ω; low-voltage side single-phase coil resistance 0.006Ω, indu...

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Abstract

The invention relates to a fault line selection method with an improved oscillator system. The method includes the steps that built-in signals of a Duffing chaotic oscillator are replaced by a mathematic model for representing fault transient zero sequence currents, and appropriate parameters are selected for building an IOS; secondly, when a fault occurs, four-layer db10 wavelet packet decomposition is carried out on the transient zero sequence currents within the first 1 / 2 power frequency period after the fault occurs, feature bands are extracted according to the maximum energy principle, and then the feature bands are further led into the IOS to be solved; finally, a new fault line selection criterion combining the maximum chaos distance and the average chaos distance of phase paths is provided. A large number of simulation experiments show that accurate line selection can be achieved with the method in weak signals under the strong noise background.

Description

technical field [0001] The invention relates to a fault line selection method using an improved vibrator system, and belongs to the technical field of fault line selection in electric power systems. Background technique [0002] At present, the fault line selection method mainly uses wavelet transform, S transform, Prony algorithm, Hough transform and other signal processing tools to extract signals, and then uses artificial neural network, support vector machine, etc. to establish line selection criteria. [0003] Wavelet transform has good localization characteristics in time domain and frequency domain, and can extract the characteristics of transient signals at different scales, but wavelet transform is easily affected by noise. In addition, different wavelet basis functions will lead to different transient feature extraction results. The S-transform can determine the dominant characteristic frequency of the zero-sequence current, and by comparing the S-transform energy...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
Inventor 王晓卫高杰魏向向侯雅晓张涛
Owner HENAN POLYTECHNIC UNIV
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