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A method for accurate fault location of distribution network based on d-pmu device

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 shorten data upload interval, improve the accuracy of fault location, and widen the effect of data sampling depth

Active Publication Date: 2021-11-16
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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  • A method for accurate fault location of distribution network based on d-pmu device
  • A method for accurate fault location of distribution network based on d-pmu device
  • A method for accurate fault location of distribution network based on d-pmu device

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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 such as Figure 4 The nodes shown are {1,3,6,9,12,15,18,21,29}, and a fault diagnosis model is established for them.

[0089] Establish a fault diagnosis model based on the nodes that have been configured with D-PMU and whether there is a T-connection line-to-line. The established models are respectively figure 2 and image 3 shown.

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

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Abstract

The invention discloses a method for accurately locating a distribution network fault based on a D-PMU device. The method includes: 1) establishing a fault diagnosis model according to the configuration of the D-PMU of the distribution network; real-time communication acquisition based on the D-PMU and upload measurement data; 2) sort out the measurement data before and after the failure; judge whether there is a T connection line at both ends of the failure place, if it is to perform step 3), if not perform step 4); 3) identify the fault line and For non-fault lines, the measurement information of non-fault lines is merged; 4) Use the measurement data before and after the fault to solve the fault diagnosis model of the distribution network; 5) Calculate and sort out the fault location. The invention acquires the location of the fault and determines the exact location of the distribution network fault, which meets the needs of practical applications.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a method for accurately locating 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 one of the important components 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 of the user side. Compared with the transmission network, the distribution network has the characteristics of larger scale, harsher environment, more variable operation and more branch lines, so many diagnostic methods of the transmission network are not applicable in the distribution network. Faults will have a great impact on the distribution network. Therefore, after a sudden failure of the distribution network line, how to timely and accurately j...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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