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D-PMU device-based power distribution network fault accurate positioning method

A distribution network fault and precise positioning technology, applied in the field of distribution network, can solve the problems of inability to achieve high-precision measurement data sampling, insufficient measurement accuracy at the measurement end, and decreased fault location accuracy, so as to improve fault location Accuracy, widening the depth of data sampling, and improving the effect of data sampling accuracy

Active Publication Date: 2020-09-11
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

However, the above method is easily affected by various factors such as the configuration position of the fault indicator and the quality of measurement information, resulting in a decrease in the accuracy of subsequent fault location; or the lack of PMU measurement, resulting in the failure of certain lines to achieve high accuracy. The measurement data sampling has certain limitations
[0006] Based on the above problems, the impedance method and intelligent measuring device are applied to the precise fault location of the distribution network to improve the positioning accuracy, and at the same time solve the problems of insufficient measurement accuracy and poor real-time performance at the measurement end

Method used

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  • D-PMU device-based power distribution network fault accurate positioning method
  • D-PMU device-based power distribution network fault accurate positioning method
  • D-PMU device-based power distribution network fault accurate positioning method

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Embodiment 2

[0088] The sample data of the calculation example comes from the IEEE33 node system, and the D-PMU devices are installed in the Figure 4 At the shown node {1,3,6,9,12,15,18,21,29}, establish a fault diagnosis model for it.

[0089] Establish a fault diagnosis model for the line according to the node where the D-PMU has been configured and whether there is a T-connection line to the line, and the established models are respectively figure 2 with image 3 Shown.

[0090] If there is no T-connection line where the fault occurs, locate and analyze the distance of the fault based on the measurement data of D-PMU. First, obtain the voltage equation about the fault point according to equations (3) and (4), and combine them to obtain a new equation (5). According to the current distribution law of the parallel circuit, an equation about the fault current is obtained. Such as image 3 As shown, the current I f And I kf As a parallel circuit, the fault current equation (6) is obtained. ...

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Abstract

The invention discloses a D-PMU device-based power distribution network fault accurate positioning method. The method comprises the steps of 1) establishing a fault diagnosis model according to a D-PMU configuration condition of a power distribution network; acquiring and uploading measurement data based on real-time communication of the D-PMU; 2) arranging measurement data before and after a fault occurs; judging whether T-connection lines exist at the two ends of the fault position or not, if yes, executing the step 3), and if not, executing the step 4); 3) identifying a faulty line and a non-faulty line, and combining the measurement information of the non-faulty line; 4) solving the power distribution network fault diagnosis model by using the measurement data before and after the fault, and 5) performing calculating and sorting to complete fault positioning. According to the power distribution network fault diagnosis method, the position of the fault is obtained, the accurate position of the fault of the power distribution network is determined, and the requirements in practical application are met.

Description

Technical field [0001] The invention relates to the field of power distribution networks, and in particular to a method for accurately locating power distribution network faults based on a D-PMU (Distribution Phasor Measurement Unit, D-PMU) device. Background technique [0002] The distribution network in the power system is an important part of the power grid. It connects the user side and the high-voltage side, and is an important link between the power supply company and the power user, and needs to maintain the power quality on the user side. Compared with the transmission grid, the distribution network has the characteristics of larger scale, harsher environment, more variable operation and more branch lines. As a result, many diagnostic methods of the transmission grid are not applicable in the distribution network. Failures will have a greater impact on the distribution network. Therefore, after a sudden failure of the distribution network, how to determine the faulty se...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y02E40/70Y02E60/00Y04S10/22
Inventor 孔祥玉徐勇袁智勇徐全王成山李鹏焦在滨黄晓彤
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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