Multi-evaluation-index-based grid key line identification method

A key circuit and evaluation index technology, applied in the direction of circuit devices, AC network circuits, electrical components, etc.

Active Publication Date: 2018-01-23
广东电网有限责任公司惠州供电局 +1
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It can be seen that the existing methods for identif...

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  • Multi-evaluation-index-based grid key line identification method
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  • Multi-evaluation-index-based grid key line identification method

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[0075] In order to better understand the purpose, technical solutions and technical effects of the present invention, the present invention will be further explained below in conjunction with the accompanying drawings.

[0076] The present invention proposes a method for identifying key lines of a power grid based on multiple evaluation indicators, and its implementation process includes the following detailed steps:

[0077] Step 1, input power system topology parameters, electrical characteristic parameters, line parameters, external environment parameters and economic indicators;

[0078] Step 2. Calculate the index value of each line on each evaluation index, and the specific index includes:

[0079] a. Weighted line betweenness index A k :

[0080]

[0081] In the formula: Z ij (k) represents the number of times the shortest electrical path connecting nodes i and j passes through line k.

[0082] b. Improved power flow entropy index B k :

[0083]

[0084] ...

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Abstract

The invention relates to a multi-evaluation-index-based regional grid key line identification method. The method comprises the following steps: inputting power system parameters; calculating various evaluation index values of a line; after standardized processing, calculating weights of all indexes under subjective and objective weighting methods; establishing an optimal combination weight model based on a moment estimation theory to determine a comprehensive weight of the indexes; and according to a radar map, calculating a comprehensive evaluation result of the line and identifying a key line in the grid. According to the invention, the importance of the line is analyzed by using multiple indexes; and thus compared with the single evaluation index, the multiple indexes enable the resultto be comprehensive and reasonable. The index weights are determined by using the optimal combination weight model, so that advantages of the subjective and objective weighting methods are both considered. On the basis of the radar map method, the line is evaluated comprehensively, so that the influences on the key line identification result by various factors are reflected vividly and visually and thus the decision maker is assisted in making the correct strategy. With the method provided by the invention, the key line of the grid is identified well and the evaluation result conforms to the actual operation condition of the grid.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for identifying key lines of a power grid based on multiple evaluation indicators. Background technique [0002] In recent years, there have been many blackouts at home and abroad. Studies have shown that in major blackouts, a single component usually fails first, resulting in power flow redistribution, equipment overload, and then cascading failures, which eventually lead to the collapse of the power grid. A small number of lines that play a key role play a role in fueling the propagation of faults. Therefore, effectively identifying the key lines in the power grid and strengthening the construction of the grid structure have important research significance and application value for improving the reliability of the power system. [0003] Existing methods generally identify key lines from two perspectives of network topology and power grid operation status, such as power f...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 莫天文韩畅林冠强叶晓君李惠松林振智杨莉
Owner 广东电网有限责任公司惠州供电局
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