Grid Fault Partitioning Method

A technology for power grid faults and fault areas, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of ignoring the reliability of the power grid, unable to reflect the state of the power grid, etc., and achieve the effect of preventing blackouts.

Inactive Publication Date: 2016-08-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the research on power grid structural vulnerability is only related to the topological structure of the power grid itself, and cannot reflect the changing state of the power grid; while the research on state vulnerability considers the changing state of the power grid, but ignores the key factor affecting the reliability of the power grid—the power grid. structure

Method used

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  • Grid Fault Partitioning Method
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  • Grid Fault Partitioning Method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102] Example 1: Line L 8～5 A failure occurs (considered in terms of state fragility indicators).

[0103] when line L 8～5 A fault occurs, and the line L in the vulnerable line set 9～10 , L 8～9 , L 8～5 , L 5～6 closely connected with the line L 30～17 via line L 8～30 connect, disconnect line L 8～30 Analysis of the system, the results show that L 8～30 The disconnection of L will not cause cascading failures in other lines, so the line L must be disconnected 8～30 . Use the method in the embodiment of the present invention to perform network topology preprocessing on the system, set N nodes in the fault area n A series of processes such as the preliminary formation of the non-fault area node set, the calculation of the power balance in each zone, and the adjustment of the zone, the zone structure diagram is obtained as follows: Figure 9 shown.

[0104] Among them, the set of partition boundary lines is [8, 30; 7, 12; 3, 12; 11, 12; 1, 2; 13, 15], and the power balance...

example 2

[0108] Example 2: Line L 34～43 A failure occurs (considered in terms of state fragility indicators).

[0109] Line L 34～43 not in a vulnerable line, when line L 34～43 When a failure occurs, the system does not have a partition phenomenon, so the output result is still the original image of the system.

[0110] Next, the vulnerability index of the line is considered. As described in the specific embodiments of the present invention, the vulnerability index of the line includes a structural vulnerability index and a state vulnerability index. In particular, in this example, both the structural vulnerability index and the state vulnerability index have a weight of 0.5. Due to the change of the vulnerability index, the vulnerable line set of the power grid system is also correspondingly changed to [38, 65; 30, 38; 8, 5; 65, 68; 8, 9; 9, 10], that is, the vulnerable line is L 38～65 , L 30～38 , L 8～5 , L 65～68 , L 8～9 and L 9～10 .

example 3

[0111] Example 3: Line L 8～5 A fault occurs (considered by the vulnerability index of the line).

[0112] when line L 8～5 In the event of a failure, the L 38～65 , L 65～68 with L 30～38 connected, L 8～5 , L 8～9 and L 9～10 Connected, the two groups of lines are connected by line L in the middle 8～30 Connect, disconnect line L 8～30 Simulation of the system shows that L 8～30 The disconnection of L will not cause cascading failures in other lines, so the line L can be disconnected 8～30 . According to the embodiment of the present invention, the network topology preprocessing is performed on the system, and the fault area node set N n A series of processes such as the preliminary formation of the non-fault area node set, the calculation of the power balance analysis in each zone, and the zone adjustment, etc., the zone structure diagram is obtained as follows: Figure 10 shown.

[0113] Figure 10 The set of partition boundary lines in is [8, 30; 12, 14; 12, 16; 13, 15]...

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Abstract

A power grid fault partitioning method comprises the steps that firstly, the vulnerability indexes of circuits in a power grid are established to form a vulnerability circuit set of the power grid; secondly, when the power grid breaks down, whether the fault happens in the vulnerability circuit set or not is judged, if yes, the third step is executed, and if not, the process is ended; thirdly, a fault circuit node or a node of a vulnerability circuit connected with the fault circuit serves as the starting point, the vulnerability index of the circuit connected with the node is judged, if the vulnerability index is smaller than the preset threshold value, the fault circuit or the vulnerability circuit is classified into a boundary circuit, if not, the other node of the fault circuit or the vulnerability circuit is classified into a fault area, and the vulnerability indexes of the circuit connected with the other node continue to be judged till the boundary circuit is found; fourthly, the power grid is divided into the fault area or a non-fault area. By means of the power grid fault partitioning method, when the fault happens, the fault circuit can be isolated in a small area, the fault cannot spread in a large area, and serious power outage is prevented.

Description

technical field [0001] The invention relates to the field of electric power system equipment, in particular to a grid fault partitioning method. Background technique [0002] At present, with the increasing scale of the power grid, once a power grid failure occurs, the losses to people are also increasing. In 2003, large-scale power outages occurred in the United States, Canada, the United Kingdom, Russia and other countries. Among them, the major power outage in the United States and Canada on August 14 affected an area of ​​about 24,000 square kilometers (9,300 square miles) , As many as 50 million people were affected, and the New York area alone had a power outage for 29 hours. During this period, the total number of lost loads in New York was 179 million kwh, and its economic loss was as high as 30 billion US dollars. At the beginning of 2008, continuous freezing, rainy and snowy weather hit southern China, causing a large-scale power outage in the Southern Power Grid....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00
CPCG06Q10/0639G06Q50/06H02H7/26
Inventor 郑华潘秀敏袁语高芬宋晓旭
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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