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High-permeability active power distribution network fault location method based on improved VMD and S transformation

A technology of active distribution network and fault location, which is applied to the fault location, detects faults by conductor type, and measures electricity. , the effect of increasing the resolution

Inactive Publication Date: 2021-04-27
CHINA THREE GORGES UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] Aiming at the problems existing in the existing fault location method, and not suitable for the shortcomings of active distribution network location under high penetration rate

Method used

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  • High-permeability active power distribution network fault location method based on improved VMD and S transformation
  • High-permeability active power distribution network fault location method based on improved VMD and S transformation
  • High-permeability active power distribution network fault location method based on improved VMD and S transformation

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Embodiment Construction

[0064] Such as image 3 As shown, based on the improved VMD and S-transform high-permeability active distribution network fault location method, first, use the instantaneous frequency judgment method to determine the decomposition layer k value, and perform VMD decomposition on the fault traveling wave signal; then use the kurtosis criterion Select an appropriate modal component (IMFS) for S-transformation to obtain a high-resolution S-matrix, extract the high-frequency components in the matrix, and determine the arrival time of the fault traveling wave head; finally, use the distance calculation formula that does not use wave velocity to find Failure distance. Specific steps are as follows:

[0065] Step 1: Decoupling and transforming the three-phase current information after a single-phase ground fault occurs according to the Karen Bell transformation, and selecting the α-mode current component for fault analysis;

[0066] Step 2: Analyze the instantaneous frequency judgme...

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Abstract

A high-permeability active power distribution network fault location method based on improved VMD and S transformation comprises the following steps: firstly, determining a decomposition layer number k value by using an instantaneous frequency judgment method, and carrying out VMD decomposition on a fault traveling wave signal; secondly, selecting an appropriate modal component (IMFS) by utilizing a kurtosis criterion to carry out S transformation to obtain an S matrix with high resolution, and extracting a high-frequency component in the matrix so as to determine the arrival time of the wave head of the fault traveling wave; and finally, solving a fault distance through a distance calculation formula without wave velocity. The method can accurately measure the fault distance of the power transmission line in the high-permeability active power distribution network, and the measurement error is within 200m.

Description

technical field [0001] The invention relates to the field of distance measurement of distribution network faults, in particular to a high-permeability active distribution network fault distance measurement method based on improved VMD and S transformation. Background technique [0002] As the penetration rate of renewable energy in the power system continues to increase, its uncertainty will have a certain impact on the fault location of the distribution network. Since the access of DG will change the operation mode and flow direction of the distribution network, and the operation characteristics of DG itself will be affected by the external environment, it will increase the difficulty of accurate distance measurement of the active distribution network. Therefore, it is particularly important to find a suitable and accurate method to study the ranging problem of active distribution network under high penetration rate. [0003] Aiming at the ranging problem of distribution n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 徐艳春赵彩彩谢莎莎吕密
Owner CHINA THREE GORGES UNIV