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Power distribution network single-phase earth fault line selection method based on gradient boosting tree algorithm

A technology of single-phase ground fault and gradient boosting tree, which is applied in the direction of fault location, fault detection according to conductor type, measurement of electricity, etc., can solve the problem of single-phase ground fault line selection in distribution network, and achieve high line selection accuracy, The effect of strong generalization ability and easy promotion

Inactive Publication Date: 2020-06-26
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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Problems solved by technology

[0004] The purpose of the present invention is to provide a distribution network single-phase ground fault line selection method based on the gradient lifting tree algorithm, to solve the problem of distribution network single-phase ground fault line selection, the present invention will zero-sequence current sampling value and The gradient boosting tree model is used in the single-phase ground fault line selection of distribution network, which can improve the accuracy of fault line selection in distribution network, and has important practical significance for maintaining the safe and stable operation of the system

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  • Power distribution network single-phase earth fault line selection method based on gradient boosting tree algorithm
  • Power distribution network single-phase earth fault line selection method based on gradient boosting tree algorithm
  • Power distribution network single-phase earth fault line selection method based on gradient boosting tree algorithm

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Embodiment

[0036] In the training set, constructs such as Figure 6 The distribution network model shown, the distribution network model includes two ways of ungrounded neutral point and grounded neutral point through arc suppressing coil. , the model parameter is r 1 = 0.17Ω / km, r 0 = 0.23Ω / km, L 1 =1.21mH / km, L 0 =5.48mH / km, C 1 =9.7pF / km, C 0 =6pF / km, single-phase grounding faults occur at intervals of 9° between the fault phase voltage 0°~360°, the transition resistance of the grounding point is respectively 7Ω, 28Ω, 390Ω, 890Ω, 1500Ω, 2000Ω, and is set separately on each line 3 points of failure. In the test set, change the line parameters and simulation conditions, and the overhead line model parameter is r 1 = 0.33Ω / km, r 0 =1.041Ω / km, L 1 =1.31mH / km, L 0 =3.96mH / km, C 1 =7pF / km, C 0 =4pF / km, the cable line model parameter is: r 1 = 0.0791Ω / km, r 0 = 0.2273Ω / km, L 1 =0.2642mH / km, L 0 =0.9263mH / km, C 1 =0.373uF / km, C 0 =0.166uF / km, a single-phase grounding fault o...

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Abstract

The invention discloses a power distribution network single-phase earth fault line selection method based on a gradient boosting tree algorithm. According to the method, data processing is carried outon a line zero-sequence current sampling value after a fault; according to the method, the zero-sequence current sampling value data of each line after normalization is obtained, then the current data of each line is used as the input of the gradient boosting tree model, the line corresponding to the maximum output value of the gradient boosting tree model is selected as the faulty line, and finally a good line selection effect is obtained. The method is not influenced by the network structure change and fault conditions of the power distribution network, and is of great significance to the fault diagnosis and safe and reliable operation of the power distribution network with a complex and changeable structure.

Description

technical field [0001] The invention belongs to the field of electric power systems, relates to the field of distribution network fault diagnosis, and in particular relates to a single-phase grounding fault line selection method of a distribution network based on a gradient boosting tree algorithm. Background technique [0002] As a key link connecting the transmission side and the power consumption side of the power system, the distribution network's operation safety and reliability directly affect the user's satisfaction with power consumption. The data show that the faults in the power system mainly come from the distribution network, and the single-phase ground fault accounts for 80%. When a single-phase ground fault occurs in the distribution network, the voltage of the non-faulted phase rises, and at the same time, the intermittent arc grounding threatens the insulation level of the system and easily expands the scope of the fault. Therefore, it is necessary to detect ...

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Application Information

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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088Y04S10/52
Inventor 冯光陈明王鹏徐铭铭袁嘉玮吴桐焦在滨
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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