Distribution network fault positioning method based on network structure matrix

A technology of fault location and structural matrix, which is applied in the field of power transmission and distribution, can solve problems such as complex methods, cumbersome positioning, and poor real-time performance, and achieve the effects of simple methods, fast speed, and improved stability and power supply reliability

Inactive Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing positioning methods still have many deficiencies, such as complex methods, cumbersome positioning, and poor real-time performance, which need further research

Method used

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  • Distribution network fault positioning method based on network structure matrix
  • Distribution network fault positioning method based on network structure matrix
  • Distribution network fault positioning method based on network structure matrix

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Embodiment Construction

[0028] The basic principle of the present invention is: if a fault current flows through a certain node, along the direction of the current, if the next adjacent node or any sub-node has a fault overcurrent in the same direction, the node is taken as The feeder at the input is not in the fault zone; otherwise it is in the fault zone.

[0029] figure 2 It vividly reflects the situation of the monitoring terminal of the fault section in the hand-in-hand area when the fault occurs. In this figure, A represents the substation (power supply), and A-1, A-2, A-3, A-4, A-5, B-3-2, and D-4 are the node numbers, which are also the numbers of the monitoring terminals; broken lines The arrow represents the fault segment, and the wide arrow represents the status of the monitoring terminal of the node currently pointed to (dark color means overcurrent, light color means no overcurrent). exist figure 2 Among them, A-4 monitoring equipment detects overcurrent, and A-5 monitoring equipmen...

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Abstract

The invention discloses a distribution network fault positioning method based on a network structure matrix. The method comprises steps: according to a distribution network structure in a positioning region, a distribution network topology matrix D for reflecting an adjacency relationship between a feeder line section and each node; according to current monitoring data acquired by a line measurement device corresponding to each node, a measurement column vector G is generated; each row element of the distribution network topology matrix D and an element of the measurement column vector G are multiplied respectively according to a bit, a fault positioning matrix F is obtained according to the multiplication result; and finally, according to the fault positioning matrix F, whether short circuit fault or ground fault happens to each feeder line section is judged. Through one-time calculation of the network topology matrix and the measurement column vector, the fault region can be positioned directly, the method is simple, the calculation amount is small, the speed is fast, favorable conditions are created for timely finding out and cutting fault lines, and distribution network operation stability and power supply reliability are improved.

Description

technical field [0001] The invention relates to a method for detecting and locating a short circuit or a ground fault in a distribution network, belonging to the technical field of power transmission and distribution. Background technique [0002] The distribution network is an important power supply facility in cities and rural areas. Its operating status is closely related to people's production and life. Rapid and accurate detection and precise positioning of distribution network faults is the key to timely removal of faulty lines and improve the stability of distribution network operation. and power supply reliability. At present, there are endless methods for fault location based on various line equipment, and there are also many location methods used, each of which has its own characteristics. However, there are still many deficiencies in the existing positioning methods, such as complex methods, complicated positioning, and poor real-time performance, which need ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 王吉友范继伟李鑫郭康宁金涛
Owner STATE GRID CORP OF CHINA
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