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 m

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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0034] Example 1:

[0035] Such as figure 1 As shown, there are 7 fault indicators in the topological structure of the distribution network, with the power flow direction of the distribution network as the positive direction, the power supply node in the distribution network as the starting number, and the location of the fault indicator in the grid , The fault indicator nodes are sequentially numbered as FI 1 -FI 7 , The line between nodes and the line after the end node are sequentially numbered as FD 1 -FD 7 .

[0036] The incidence matrix building unit of the master station control center generates an incidence matrix:

[0037] The node injected current is the current flowing into the node, the line current is the current flowing in the branch connected to the two nodes, and the correlation matrix represents the relationship between the injected current and the line current, which can be carried out through the topology of the distribution network Construct. The correlation ma...

Example Embodiment

[0047] Example 2:

[0048] image 3 It is the topological structure diagram of the distribution network with distributed power sources DG, and the node number, section number, and construction of the correlation matrix A are the same as those in the first embodiment. The fault indicator has the function of detecting the direction of current and can act according to the direction of current. Failure occurred in FD 3 Section. 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 sources for power supply, and the injected current and line current are no longer a single radial type. Set the current direction provided by the substation power supply Is the positive direction. When the fault indicator detects that the fault current is in the same direction as the forward direction, the fault indicator triggers action and sends the status information to the master station control...

Example Embodiment

[0055] Example 3:

[0056] Figure 4 It is the topological structure diagram of the distribution network with 7 fault indicators. The node number, section number, and construction of the correlation matrix A are the same as those in the first embodiment. Failure occurred in FD 5 Section, where the fault indicator FI 4 Refused to move. The fault location unit of the master station control center collects the FI 1 , FI 2 , FI 3 And FI 5 The state information, the generated trigger vector is:

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

[0058] The fault location unit is calculated according to the following matrix calculation 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 3rd element and the 5th element are 1, then there are three possible fault situations: the fault is in section FD 3 , The fault is in section FD 5 , Section FD 3 And section FD 5 Failure occurs at the same time, thus forming three fault zone vectors I ...

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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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