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Low-sampling-rate traveling wave fault locating method based on VMD (variational mode decomposition) and SDEO (symmetric difference energy operator)

A locating method and technology for traveling wave faults, which are applied in fault location, fault detection by conductor type, etc., to achieve the effect of effective judgment, fast speed, and improved detection accuracy

Active Publication Date: 2018-06-05
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention mainly solves the technical problems existing in the existing methods, and provides a method that utilizes the advantages of strong modal stability of the variational mode decomposition at low sampling frequency and the excellent tracking signal singularity of the symmetrical differential energy operator to achieve A transmission line traveling wave fault location method for determining the arrival time of the initial fault traveling wave and locating the fault occurrence point

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  • Low-sampling-rate traveling wave fault locating method based on VMD (variational mode decomposition) and SDEO (symmetric difference energy operator)
  • Low-sampling-rate traveling wave fault locating method based on VMD (variational mode decomposition) and SDEO (symmetric difference energy operator)
  • Low-sampling-rate traveling wave fault locating method based on VMD (variational mode decomposition) and SDEO (symmetric difference energy operator)

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Embodiment

[0070] Below is the step that adopts the specific embodiment of the present invention, as follows:

[0071] Step 1: Perform phase-to-mode conversion on the collected original fault traveling wave voltage signal:

[0072] Due to the mutual coupling effect of capacitance and inductance among the three phases of the distribution line, it is necessary to decouple through phase-mode transformation. However, the existing transformation matrices such as Clarke transformation and Karen Bell transformation cannot be applied to represent all fault types, and generally need to use dual modulus or cooperate with phase selection, thus increasing the amount of calculation. Therefore, the present invention uses a phase-to-mode transformation matrix, which can reflect all fault types.

[0073] The transformation matrix is:

[0074]

[0075] Through the above matrix transformation, the a, b, and c three-phase voltage phasors affected by the coupling effect can be converted into mutually i...

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Abstract

The invention discloses a low-sampling-rate traveling wave fault locating method based on VMD (variational mode decomposition) and an SDEO (symmetric difference energy operator), and the method combines the VMD and the SDEO, and can achieve the precise detection of an instantaneous energy abrupt change moment of a wave head at a lower sampling rate through the high-stability decomposition mode andthe excellent tracking signal singularity of an energy operator, thereby achieving the locating of an occurrence point of a fault. The method makes the most of the arrival moment of the head of the traveling wave and line length so as to eliminate the impact on fault range finding, thereby improving the position precision. Moreover, the method can save the equipment cost, and is suitable for actual engineering.

Description

technical field [0001] The invention relates to a distance measurement method for traveling wave faults of distribution lines, in particular to a distance measurement method for traveling wave faults of distribution lines using variational mode decomposition (VMD) and symmetrical differential energy operator (SDEO). Background technique [0002] Distribution line fault location technology is very important for the safe and stable operation of distribution network, and it is a research focus in the field of distribution network automation. From the current common fault location principles, it mainly includes impedance method, fault analysis method and traveling wave method. Among many fault location methods, traveling wave method has a wide range of applications, fast and accurate positioning, and is not affected by line parameters, CT, etc. Saturation, system operation mode, transition resistance and fault type and other factors have attracted extensive attention from expert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 陈中明仇志成张耀宇郑楚韬孔祥轩秦川刘杰荣章涛邹俊英耿爱伦何其关家华陈黎丽李斌陈春泉
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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