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Vulnerability based power grid early-warning method

A vulnerability and vulnerability index technology, applied in the field of vulnerability-based power grid early warning, can solve problems such as affecting the accuracy of power grid accident early warning and inaccurate positioning of weak links in the power grid.

Active Publication Date: 2016-02-03
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, for method operators, they are not only concerned about the nodes or branches whose operating states are easily affected by disturbances, but also those nodes or branches that approach the critical state quickly and are closer to the critical state after being disturbed. The existing state vulnerability indicators do not take this into account, resulting in inaccurate positioning of weak links in the power grid and affecting the accuracy of power grid accident warning

Method used

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  • Vulnerability based power grid early-warning method
  • Vulnerability based power grid early-warning method
  • Vulnerability based power grid early-warning method

Examples

Experimental program
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Embodiment 1

[0047] figure 1 It is a flow chart of calculating node / branch status vulnerability indicators in a vulnerable power grid early warning method shown in a specific embodiment of the present invention, including the following steps:

[0048] Step 1. Establish according to formula (1)

[0049] Static energy function model for constructing state vulnerability indicators.

[0050] Specifically, formula (1) is:

[0051] E i = ∫ [ f i , g i ] · dδ i ...

Embodiment 2

[0068] figure 1 It is a flow chart of calculating node / branch status vulnerability indicators in a vulnerable power grid early warning method shown in a specific embodiment of the present invention, including the following steps:

[0069] Step 1. Establish a static energy function model according to the formula (1), which is used to construct a state vulnerability indicator.

[0070] Specifically, formula (1) is:

[0071] E i = ∫ [ f i , g i ] · dδ i ...

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Abstract

The invention discloses a vulnerability based power grid early-warning method, which comprises the steps of calculating power flow distribution of a power grid method under an initial load; calculating a state vulnerability index of each node or branch in a power grid under different load increase rates according to the flow distribution acquired by calculation, wherein the state vulnerability index is used for representing advantages and disadvantages of the operating state of each component in the power grid method, and the state vulnerability index is determined by a vulnerability trend index and a vulnerability margin index together. According to the invention, the improved state vulnerability evaluation indexes are adopted, thereby being screening out components which are high in critical state approaching speed and closer to the critical state after being disturbed, improving the positioning precision, and being convenient for accurately analyzing vulnerable nodes or branches of an electric power method.

Description

[0001] This case claims the priority of the Chinese utility model patent filed on April 20, 2015 with the application number 201520237177.3. technical field [0002] The invention relates to the field of early warning of grid faults, in particular to a method for early warning of a power grid based on vulnerability. Background technique [0003] Nowadays, the power grid is gradually developing in the direction of ultra-high voltage, large capacity, long-distance power transmission and regional interconnection, and its structure is unprecedentedly complex. While economies of scale are enhanced, so too is the complexity and uncertainty of fault propagation and its destructive capabilities. [0004] When suffering from various disturbances and faults, in order to prevent cascading catastrophic accidents caused by the deterioration of the node voltage level of the power method and the decline of branch transmission capacity, it is necessary to analyze the current vulnerability a...

Claims

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Application Information

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IPC IPC(8): G06Q50/06G06Q10/06
Inventor 祁晓笑于永军焦春雷刘大贵南东亮李华强
Owner STATE GRID CORP OF CHINA
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