Power distribution network fault location method based on fault indicators

A fault indicator and distribution network fault technology, applied in the field of power system, can solve the problems of unrealistic judgment of fault location, difficulty in determining fault section, easy to make wrong judgment, etc., achieving fast calculation speed, low price and low cost. The effect of power consumption

Inactive Publication Date: 2015-04-01
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a fault occurs, the alarm and fault information from the power outage management system, emergency telephone system and user information system will be displayed on the system operation surface in an explosive manner. By manually confirming the status of the fault indicators one by one, an accurate fault location judgment can be made. It is unrealistic; it is also very difficult to determine the fault section from so much information, which is not only time-consuming and laborious, but also easy to make wrong judgments, especially when multiple faults occur or include distributed power distribution network faults, the fault information will be more complicated

Method used

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  • Power distribution network fault location method based on fault indicators
  • Power distribution network fault location method based on fault indicators
  • Power distribution network fault location method based on fault indicators

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, there are 7 fault indicators in the topology of the distribution network, the direction of the power flow of the distribution network line is the positive direction, the power node in the distribution network is the starting number, and the geographical location of the fault indicators in the grid is , the fault indicator nodes are sequentially numbered as FI 1 -FI 7 , for the lines between the nodes and the lines after the end node, the section number is FD 1 -FD 7 .

[0036] The correlation matrix construction unit of the master station control center generates the correlation matrix:

[0037] The node injection current is the current flowing into the node, and the line current is the current flowing in the branch connected to the two nodes. The correlation matrix represents the relationship between the injection current and the line current, which can be determined through the topological structure of the distribution network. Construc...

Embodiment 2

[0048] image 3 It is a topological structure diagram of a distribution network including a distributed power supply DG, and the node numbers, section numbers, and building an association matrix A are the same as those in Embodiment 1. The fault indicator has the function of detecting the direction of the current, and can act according to the direction of the current. Fault occurs in FD 3 segment. Because the distributed power supply DG is connected to the line, the direction of the power flow in the line has changed, that is, the system contains two power supplies for power supply, the injection current and the line current are no longer a single radiation type, and the current direction provided by the substation power supply is set is the positive direction. When the fault indicator detects that the fault current is in the same direction as the positive direction, the fault indicator triggers an action and sends the status information to the master station control center...

Embodiment 3

[0056] Figure 4 It is a topological structure diagram of the distribution network including 7 fault indicators, and the node numbers, section numbers, and building correlation matrix A are the same as those in Embodiment 1. Fault occurs in FD 5 section, where the fault indicator FI 4 Refuse to move. The fault location unit of the master station control center collects the FI 1 、FI 2 、FI 3 and FI 5 The status information of , and the trigger vector is generated as follows:

[0057] I L =[1 1 1 0 1 0 0] T

[0058] The fault location unit operates according to the following matrix operation formula:

[0059] I FD =A -1 × I L

[0060] Get the fault location vector:

[0061] I FD =[0 0 1 -1 1 0 0] T

[0062] I FD The third element and the fifth element are 1, then there are three possible fault situations, namely: the fault is in the section FD 3 , the fault is in section FD 5 , section FD 3 and section FD 5 Simultaneous faults occur, thus forming three faul...

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Abstract

The invention discloses a power distribution network fault location method based on fault indicators. The method comprises several steps as follows: construction of an incidence matrix, sending of state information to a master station control center by the fault indicators, generation of a trigger vector and location of a fault section. An incidence matrix construction unit generates the incidence matrix, the fault indicators send the state information to a master station through a Zigbee wireless network, and a fault location unit generates a trigger vector, performs matrix operation on the trigger vector and the incidence matrix to acquire a fault section vector, analyzes and locates the fault section and diagnoses the fault information. Effective fault location of a power distribution network which has multiple faults and contains distributed power supplies can be realized. When the method is used for locating the faults of the power distribution network, a normalized incidence matrix is not required, and fault location of the complex power distribution network structure with multiple fault points and multiple power supply systems can be realized; the method has certain fault tolerance and is simple in judgment principle, small in calculation amount, stable, reliable, quick and accurate in fault location and low in cost.

Description

technical field [0001] The invention belongs to the field of power systems, and mainly relates to a fault indicator-based distribution network fault location method. Background technique [0002] Due to the complex structure of the distribution network, many branches, high failure rate of the line, and the way that the neutral point is not grounded or grounded through the arc suppression coil, it is difficult to locate after the fault, which seriously affects the reliability of power supply. In order to improve the power supply reliability of the distribution network and the ability to deal with faults in time, the automation of distribution network has been paid more and more attention by domestic power supply enterprises. Distribution network automation includes functions such as management control, data acquisition system, power outage management system, emergency telephone system (95598), user information system, fault detection, isolation and self-healing system, optima...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 李佩杰刘乾白晓清阳育德李滨祝云韦化罗翠云
Owner GUANGXI UNIV
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