A single-phase grounding fault line selection method based on the steady-state variation before and after the fault

A technology of single-phase ground fault and line selection method, applied in the field of power system, can solve problems such as process complexity and improve the threshold of application, and achieve the effect of reducing model misjudgment and improving accuracy

Active Publication Date: 2022-07-26
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

The third type of method can perform better than the first two types due to the combination of the advantages of the method and the number of samples, but the complexity of the process and the demand for high-precision measurement equipment such as PMU greatly increase the application requirements. threshold

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  • A single-phase grounding fault line selection method based on the steady-state variation before and after the fault
  • A single-phase grounding fault line selection method based on the steady-state variation before and after the fault
  • A single-phase grounding fault line selection method based on the steady-state variation before and after the fault

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Embodiment Construction

[0031] Refer to attached drawings. The data-driven single-phase grounding fault line selection method based on the steady-state variation information before and after the fault of the present invention adopts the following steps:

[0032] Step 1: Build the target distribution network with ungrounded neutral point in MATLAB / Simulink, input the line parameters, obtain the variation range of the system power supply operation mode, the variation range of each load, the breaking rule of the tie switch, and the single-phase grounding transition resistance size range.

[0033] Step 2: Set the operation mode of the distribution network, specifically:

[0034] (1) Randomly set the equivalent impedance within the changing range of the system power supply operation mode;

[0035] (2) Randomly set the load size within each load variation range;

[0036] (3) The state of each tie switch is randomly set according to the breaking rules of the tie switch.

[0037] Step 3: Set up a single-...

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Abstract

The invention proposes a data-driven single-phase grounding fault line selection method based on the steady-state variation information before and after the fault. The invention is divided into two parts: offline training and online application. First, the topology information and network parameters of the target distribution network are obtained, and a corresponding model is established in the simulation software; feature, the fault line number is the label, the simulation obtains a sufficient sample data set, the machine learning method is used to train the line selection model, and the network error-prone line selection area is obtained by testing; finally, the sample features obtained from the actual distribution network are input for offline training. model, output the line selection result and confidence level, and compare it with the error-prone line selection area. If the line selection result belongs to the error-prone line area, a prompt will be given. The invention can achieve accurate line selection for the single-phase grounding fault of the neutral point ungrounded distribution network, and still has a high line selection accuracy under the condition that the fault is grounded through high resistance.

Description

technical field [0001] The invention belongs to the field of electric power systems, in particular to a data-driven single-phase grounding fault line selection method based on steady-state variation information before and after a fault, which is suitable for a neutral point ungrounded distribution network. Background technique [0002] In order to ensure the reliability of power supply in the distribution network, when the capacitance current of the whole system does not exceed a certain value, the neutral point is mostly ungrounded. When a single-phase grounding fault occurs in the neutral point ungrounded distribution network, the fault current is small, and the current protection will not operate, which provides time for troubleshooting, but also causes difficulty in fault line selection, especially when the fault point touches the branches. , sand, asphalt, cement and other non-ideal media, high-resistance grounding faults are formed, which further increases the difficul...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/52
Inventor 张磊杨文斌周才全杨林刚施朝晖杨飞
Owner POWERCHINA HUADONG ENG COPORATION LTD
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