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Power grid key node identification method considering voltage grade influence

A voltage level, key node technology, applied to AC networks with different sources of the same frequency, reduction of asymmetry in polyphase networks, elimination/reduction of asymmetry in multiphase networks, etc., can solve problems such as single evaluation angle

Active Publication Date: 2019-05-31
BINZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

[0005] However, the evaluation and identification of key nodes based only on the active power flow betweenness of nodes has a technical problem that the evaluation angle is relatively single

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  • Power grid key node identification method considering voltage grade influence
  • Power grid key node identification method considering voltage grade influence
  • Power grid key node identification method considering voltage grade influence

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Embodiment Construction

[0034] In the following, the present invention will be further described in detail in conjunction with the accompanying drawings and embodiments, so as to make the purpose, technical solutions and advantages of the present invention more clear. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] figure 1A method for identifying key nodes of a power grid considering the impact of voltage levels according to an exemplary embodiment of the present invention is shown. The method of this embodiment mainly includes:

[0036] Step 101, stratify the power grid system according to the voltage level, the power grid system includes a plurality of branches, a plurality of nodes, the node is the confluence point of two or more branches; based on the power grid system As a result of the layering, the voltage levels where multiple nodes and multiple branches are located are obtaine...

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Abstract

The invention discloses a power grid key node identification method considering a voltage grade influence. The method mainly comprises the following steps of layering a power grid system according toa voltage grade; based on a layering result, acquiring a voltage grade layer where a node and a branch are located; acquiring a voltage value of the node in the power grid system and a power flow value of the branch; increasing an unit charge to the power grid system, calculating a voltage increase value of each node, and calculating a power flow change value of each branch; obtaining a voltage increase rate theil entropy of each node in the power grid system; obtaining a weighted power flow impact rate theil entropy of each branch in the power grid system; using a binary analysis method to obtain subjective weight of two entropies; using an objective weight method of the entropy to obtain an objective weight; and acquiring a comprehensive weight based on the subjective weight and the objective weight, and screening a key node based on the comprehensive weight. An evaluation index established in the invention can be used to visually and quantitatively analyze the critical degree of thenode so as to efficiently identify the key node of the system.

Description

technical field [0001] The invention relates to the technical field of power grid security, in particular to a method for identifying key nodes of a power grid taking into account the influence of voltage levels. Background technique [0002] In the fields of power grid security and vulnerability analysis, the identification of key nodes and key branches is an important link. At present, the research methods used in the identification of key nodes in the power grid mainly include complex network theory, energy function method, and probability analysis. In the existing technical means, from the perspective of complex network and network maximum flow theory, the transmission contribution degree is introduced to evaluate the key nodes of the power grid. The literature "Identification of Key Links in Power Grid Based on Improved Complex Network Model" (Authors: Xu Jingyou, Chen Chong, Luo Chunjian, etc.; Source: Electric Power System Automation, 2016, 40(10): 53-61) improves th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/26
CPCY02E40/50
Inventor 刘吉龙杜明田张海诚高红梅王鹏举宋曙光李丽丽王波杨洪波张君李华强刘美君
Owner BINZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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