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Fault region locating method for electric distribution network with distributed power supply

A technology for distribution network faults and distributed power sources, which can be applied to fault locations and other directions, and can solve problems such as poor fault tolerance and poor practicability.

Active Publication Date: 2012-04-18
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the principle of matrix algorithm is simple and easy to implement, it is widely used at present, but it has the disadvantage of poor fault tolerance; while the fault area location algorithm based on intelligent algorithm has certain fault tolerance, but its practicability is poor
With the application and promotion of smart distribution network, a large number of DGs will be connected to the distribution system, and some sections in the feeder will be powered by dual power sources. The above fault area judgment method will no longer be applicable.

Method used

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  • Fault region locating method for electric distribution network with distributed power supply
  • Fault region locating method for electric distribution network with distributed power supply
  • Fault region locating method for electric distribution network with distributed power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The distribution network containing distributed power sources in this embodiment is as follows figure 1 As shown, the distributed power generation is configured on the low-voltage side of the distribution transformer at each end of the distribution network. Switches 1, 10, and 13 are the outlet circuit breakers of the three feeders, 6, 7, and 11 are tie switches, and the rest of the nodes are section switches. Or measurable points, the distribution transformer at the end of the distribution network, various switches and each measurable point are all nodes of the distribution network.

[0041] Such as figure 2 As shown, the method for locating a fault area of ​​a distribution network with distributed power sources in this embodiment includes the following steps:

[0042] (1) Select 25 nodes of the distribution network, and number the nodes. When numbering the nodes, first number the 14 downstream nodes, and finally number the 11 branch end nodes;

[0043] Define the c...

Embodiment 2

[0065] The distribution network including distributed power sources in this embodiment is the same as that in Embodiment 1.

[0066] The method for locating a distribution network fault area including a distributed power source in this embodiment includes the following steps:

[0067] (1) Select 25 nodes of the distribution network, and number the nodes. When numbering the nodes, first number the 14 downstream nodes, and finally number the 11 branch end nodes;

[0068] Define the current reference positive direction of each node (such as figure 1 The direction indicated by the middle arrow), the rule is: any distribution network area has at least one area port node whose reference current flows into the area in the positive direction;

[0069] Define a node that is connected to the reference positive direction of node i and has no other nodes in the middle as the downstream node of node i; then node i and all its downstream nodes form a multi-port area i; 1≤i≤14;

[0070] (2...

Embodiment 3

[0083] The distribution network including distributed power sources in this embodiment is the same as that in Embodiment 1.

[0084] The method for locating a distribution network fault area including a distributed power source in this embodiment includes the following steps:

[0085] (1) Select 25 nodes of the distribution network, and number the nodes. When numbering the nodes, first number the 14 downstream nodes, and finally number the 11 branch end nodes;

[0086] Define the current reference positive direction of each node (such as figure 1 The direction indicated by the middle arrow), the rule is: any distribution network area has at least one area port node whose reference current flows into the area in the positive direction;

[0087] Define a node that is connected to the reference positive direction of node i and has no other nodes in the middle as the downstream node of node i; then node i and all its downstream nodes form a multi-port area i; 1≤i≤14;

[0088] (2...

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Abstract

The invention discloses a fault region locating method for an electric distribution network with a distributed power supply. The method comprises the following steps of: (1) selecting n nodes of the electric distribution network, and numbering the nodes; (2) building a network description matrix of the electric distribution network; (3) measuring the current I, I2, ... In of each node, and building a dual-layer information domain current difference matrix; (4) judging the fault region of the electric distribution network according to the locating criterion. In the method, the fault region is judged based on the network description matrix and the dual-layer information domain current difference matrix, so that the method has the advantages of having simple principle, being easy to realize, and having high fault tolerance.

Description

technical field [0001] The invention relates to a method for locating a fault area of ​​a distribution network, in particular to a method for locating a fault area of ​​a distribution network including a distributed power supply. Background technique [0002] At present, energy conservation and emission reduction, green energy and sustainable development have become the focus of attention of all countries. The first challenge facing human energy development is to gradually replace fossil energy with renewable energy, build an innovative system for energy use, completely transform the existing energy use system with information technology, and maximize the energy efficiency of the power grid system. Smart grid is proposed to meet this challenge. Smart grid mainly includes smart transmission network and smart distribution network. The distribution network is the last link of the power system facing users. It has the closest relationship with users and has the most direct imp...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 陈波李果丁泽俊王钢梁远升
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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