A Method for Identification of Vulnerable Lines in Power System and Prevention of Cascading Failures

A technology for power systems and cascading failures, applied in fault locations, circuit devices, AC network circuits, etc., can solve the problems of increased large-scale load loss and power failure risks that cannot be ignored, achieve good identification accuracy and effectiveness, reduce The effect of blackout risk and probability of blackout

Inactive Publication Date: 2020-06-09
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0002] According to the definition of the North American Electric Reliability Corporation (NERC), cascading failures are "uncontrolled successive failures of power system components triggered by faults at any location"; However, it cannot be ignored; especially when a fault occurs on a vulnerable transmission line in the system, the degree of large-scale load loss in the system will increase significantly; It is of great significance to reduce the load loss caused by power outage

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  • A Method for Identification of Vulnerable Lines in Power System and Prevention of Cascading Failures
  • A Method for Identification of Vulnerable Lines in Power System and Prevention of Cascading Failures
  • A Method for Identification of Vulnerable Lines in Power System and Prevention of Cascading Failures

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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] A method for identifying vulnerable lines in a power system, comprising the following steps:

[0041] Step 1: Transform the complex power network into a two-way weighted dual graph;

[0042] The nodes in the dual graph represent the transmission lines in the power grid, and each edge corresponds to the state-dependent connection between the transmission lines; a correlation matrix ΔP is established to reflect the topological connection and electrical correlation of the transmission lines.

[0043]

[0044] In the formula: n is the number of transmission lines, u and v are the numbers of transmission lines, and u, v∈{0,1,2…n}, corresponding to the node numbers in the dual graph, Δp uv Because of the transmission line L u Transmission line L caused by disconnection v , and set it as the weight of the edge u→v in the dual graph.

[0...

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Abstract

The invention discloses a method for identifying vulnerable lines in a power system and preventing cascading failures, which comprises the following steps: first converting the complex power grid into a bidirectional weighted dual graph; coefficient; then sort the vulnerable lines according to the order of constraint coefficients from small to large, and complete the identification of vulnerable lines; finally, according to the identification results of fragile transmission lines, the classic OPA model is improved, and a cascading fault prevention method based on identification of vulnerable transmission lines is proposed; the present invention The proposed method can firstly effectively and accurately identify vulnerable transmission lines that may lead to high risks; secondly, it can reduce the system's blackout risk and cascading fault blackout probability.

Description

technical field [0001] The invention relates to the field of power system fault detection and protection, in particular to identification of vulnerable lines in a power system and prevention of cascading faults. Background technique [0002] According to the definition of North American Electric Reliability Corporation (NERC), cascading failures are "uncontrolled successive failures of power system components triggered by faults at any location"; However, it cannot be ignored; especially when a fault occurs on a fragile transmission line in the system, the degree of large-scale load loss in the system will increase significantly; It is of great significance to reduce the load loss caused by power outage. [0003] There have been some researches at home and abroad on the identification of weak links in power systems and the prevention of cascading failures; the current identification methods for vulnerable lines in power networks include: the improved electrical betweenness ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G01R31/08
CPCG01R31/086G01R31/088H02J3/00H02J2203/20
Inventor 范文礼
Owner SOUTHWEST JIAOTONG UNIV
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