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A key node identification method based on weighted power flow entropy and voltage stability

A voltage stabilization, key node technology, applied to AC network circuits, AC networks with the same frequency from different sources, electrical components, etc. Influence and other problems, to reduce the possibility of identification errors, reduce the possibility, and improve the effect of stable operation

Active Publication Date: 2019-01-15
STATE GRID JIBEI ELECTRIC POWER COMPANY +1
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Problems solved by technology

[0003] In the existing technology, the key node identification method based on node betweenness can qualitatively judge that high betweenness nodes have a role in fueling the propagation of cascading faults, but it is only evaluated from the perspective of topology structure, without taking into account the actual operation of the power grid Happening
The key node identification method of the power grid based on the maximum current transmission contribution is mainly evaluated from the perspective of the node's contribution and carrying capacity in power transmission, without considering the impact of the system voltage on the safe operation of the power grid

Method used

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  • A key node identification method based on weighted power flow entropy and voltage stability
  • A key node identification method based on weighted power flow entropy and voltage stability
  • A key node identification method based on weighted power flow entropy and voltage stability

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Embodiment

[0046] combine Figure 1 to Figure 3 Examples in the present invention will be described.

[0047] Such as figure 1 As shown, the key node identification method of power grid based on weighted power flow entropy and voltage stability according to an embodiment of the present invention includes:

[0048] Step 1, obtain the basic data in the initial operating state of the power grid system;

[0049] Among them, the basic data include the active power, reactive power, initial active power, initial reactive power, rated active power, rated reactive power, voltage phase angle difference and actual voltage of the nodes and the lines where the nodes are located in the power grid system.

[0050] Step 2, according to the rated voltage U of the node Ni , active power P i , reactive power Q i , voltage amplitude U i , voltage phase angle difference θ ij and the voltage offset rate σ i , to calculate the voltage stability performance index μ of the node i ;

[0051] It should b...

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Abstract

The invention provides a method for identifying key nodes of power network based on weighted power flow entropy and voltage stability, A technical field of identify key links of power network is disclosed, By acquiring basic data in the power grid system, the load rate and the weight corresponding to the load rate of the corresponding line of any node are calculated according to the active power,and the load rate is weighted and normalized, Then the load flow entropy of any node corresponding to the active power is calculated, and the weighted load flow entropy of any node is calculated according to the load rate and load flow entropy after weighted and normalized processing, and the voltage stability performance index is introduced, and the sum of the weighted load flow entropy and loadflow entropy after normalized processing is used as the basis for identifying the key nodes of the power network. Through the technical proposal of the invention, the limitation of the power flow entropy in identifying the key nodes of the power network is remedied, the accuracy and reliability of identifying the key nodes of the power network according to the weighted power flow entropy are improved, and the possibility of the cascading trip accident of the power network is reduced.

Description

technical field [0001] The invention relates to the technical field of identification of key links of power grids, in particular to a method for identifying key nodes of power grids based on weighted power flow entropy and voltage stability. Background technique [0002] In recent years, there have been frequent blackouts in power grids around the world, causing huge economic losses and serious social impacts. Most of them have caused a series of cascading failures due to the failure or overload of some components. Among them, these components play an important role in the safe and stable operation of the power grid. It plays a very important role and is called a key component or a fragile component. It can be seen that effectively and accurately identifying the key nodes of the power grid is of great significance to the scheduling and control of the power grid and the prevention of chain trip accidents. The power grid model constructed using the physical characteristics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/06
CPCH02J3/00H02J3/06H02J2203/20
Inventor 岳贤龙刘艳芳杜亮刘倩陈博孙宇新员超张雅欣李清勉
Owner STATE GRID JIBEI ELECTRIC POWER COMPANY
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