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Fault positioning method and system based on cubic B-spline wavelets and interpolation algorithm

An interpolation algorithm and fault location technology, applied in fault location, fault detection by conductor type, measurement device, etc., can solve problems such as insufficient positioning accuracy of mutation points, and achieve the effect of improving accuracy and overcoming wave head identification.

Pending Publication Date: 2021-02-26
CHINA SOUTHERN POWER GRID COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of accurately determining the mutation point, this method will cause insufficient positioning accuracy, resulting in the inability to accurately identify the mutation point and determine the time when the traveling wave reaches the measurement point

Method used

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  • Fault positioning method and system based on cubic B-spline wavelets and interpolation algorithm
  • Fault positioning method and system based on cubic B-spline wavelets and interpolation algorithm
  • Fault positioning method and system based on cubic B-spline wavelets and interpolation algorithm

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Embodiment 1

[0038] In the technical solutions disclosed in one or more embodiments, such as figure 1 As shown, the fault location method based on cubic B-spline wavelet and interpolation algorithm includes the following steps:

[0039] Step 1, obtain the current traveling wave signal at both ends of the line, and extract the line mode component of the traveling wave signal;

[0040] Step 2, constructing the cubic B-spline wavelet as the wavelet basis, performing wavelet decomposition on the extracted line mode components to obtain the highest frequency harmonic components;

[0041] Step 3, calculate the instantaneous energy of the harmonic component with the highest frequency, and obtain the moment of sudden change of energy;

[0042] Step 4. Extract several points near the first sudden change energy, Hermite interpolates to calculate the construction curve, identifies the maximum value point of the curve, and determines the arrival time of the traveling wave; locate the fault location a...

Embodiment 2

[0097] Based on the method of embodiment 1, this embodiment proposes a fault location system based on cubic B-spline wavelet and interpolation algorithm, including:

[0098] An acquisition module: configured to acquire the current traveling wave signal at both ends of the line, and extract the line mode component of the traveling wave signal;

[0099] Decomposition module: configured to construct the cubic B-spline wavelet as the wavelet base, perform wavelet decomposition on the extracted line mode components, and obtain the highest frequency harmonic components;

[0100] Energy calculation module: configured to calculate the instantaneous energy of the harmonic component with the highest frequency, and obtain the sudden moment of energy;

[0101] Interpolation output module: configured to extract several points near the first mutation energy, Hermite interpolation calculates the construction curve, identifies the maximum value point of the curve, and determines the arrival t...

Embodiment 3

[0103] This embodiment provides an electronic device, including a memory, a processor, and computer instructions stored in the memory and executed on the processor. When the computer instructions are executed by the processor, the steps described in the method in Embodiment 1 are completed.

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Abstract

The invention provides a fault positioning method and system based on cubic B-spline wavelets and an interpolation algorithm. The method comprises the following steps: obtaining current traveling wavesignals at two ends of a line, and extracting line mode components of the traveling wave signals; constructing a cubic B-spline wavelet as a wavelet basis, and carrying out wavelet decomposition on the extracted linear mode component to obtain a harmonic component with the highest frequency; calculating the instantaneous energy of the harmonic component with the highest frequency, and obtaining the abrupt change moment of the energy; extracting a plurality of points near the first mutation energy, performing Hermite interpolation calculation to construct a curve, identifying a maximum value point of the curve, and determining a traveling wave arrival moment; and positioning a fault position according to the traveling wave arrival time. The cubic B-spline wavelet is constructed to serve asa wavelet basis for wavelet decomposition, the arrival time of a wave head is determined through a Teager energy operator and a Hermite interpolation method, a practical algorithm for power transmission line fault positioning is formed, and the accuracy of high-frequency signal first mutation point recognition can be greatly improved.

Description

technical field [0001] The present disclosure relates to the related technical field of power system line protection, and specifically relates to a fault location method and system based on cubic B-spline wavelet and interpolation algorithm. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The transmission line is responsible for the transmission of electric energy. It is a very important part of the power system, and it is also the place where the most faults occur. If the location of the fault can be quickly and accurately located after the fault, it can not only improve the reliability of the power system, but also save a lot of manpower and material resources, and bring huge economic benefits. Fault location is particularly important. [0004] At present, fault location methods can be roughly divided into two categories, one is the f...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 张弛陈朝晖余江郑茂然丁晓兵李正红史泽兵彭业吴江雄万信书孙铁鹏
Owner CHINA SOUTHERN POWER GRID COMPANY
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