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Method for identifying vulnerable line and preventing cascading fault of power system

A technology of power system and identification method, applied in the direction of fault location, circuit device, AC network circuit, etc., can solve the problems that the risk of power failure cannot be ignored, and the degree of large-scale load loss increases, so as to reduce the risk of power failure and the probability of power failure, and achieve good identification Effects of Accuracy and Validity

Inactive Publication Date: 2018-11-06
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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  • Method for identifying vulnerable line and preventing cascading fault of power system
  • Method for identifying vulnerable line and preventing cascading fault of power system
  • Method for identifying vulnerable line and preventing cascading fault of power system

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Embodiment Construction

[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 a vulnerable line and preventing a cascading fault of a power system. The method comprises the following steps of firstly, converting a complicated power grid to a bidirectional weighing dual graph; secondly, determining node constraint coefficients in the dual graph by active power coupling between power transmission lines and a dependence relation; thirdly, sequencing the vulnerable lines according to a sequence of constraint coefficients from small to large, and completing vulnerable line identification; and finally, improving a typical OPA model according to a vulnerable power transmission line identification result, and proposing a vulnerable power transmission line identification-based cascading fault prevention method. With the methodproposed by the invention, the vulnerable power transmission line which probably causes high risk can be effectively and accurately identified, and the power failure risk and the cascading fault power-failure probability of the system can be reduced.

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 ...

Claims

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Application Information

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IPC IPC(8): H02J3/00G01R31/08
CPCG01R31/086G01R31/088H02J3/00H02J2203/20
Inventor 范文礼
Owner SOUTHWEST JIAOTONG UNIV
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