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Method and system for evaluating grid structure strength of medium-voltage power distribution network

A grid structure, grid grid technology, applied in system integration technology, information technology support systems, instruments, etc., can solve problems such as low accuracy of single-angle assessment of grid structure strength

Inactive Publication Date: 2019-12-13
CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is: the present invention provides a method and system for evaluating the structural strength of the medium-voltage distribution network grid structure, which solves the problem of low accuracy of the existing single-angle evaluation of the structural strength of the grid structure

Method used

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  • Method and system for evaluating grid structure strength of medium-voltage power distribution network
  • Method and system for evaluating grid structure strength of medium-voltage power distribution network
  • Method and system for evaluating grid structure strength of medium-voltage power distribution network

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Embodiment 1

[0094] In order to solve the problem of low accuracy of evaluating the strength of the grid structure from a single angle, this application proposes a strength evaluation method, which evaluates the strength from multiple angles, and the details are as follows:

[0095] Such as figure 1 As shown, a method for evaluating the structural strength of the medium-voltage distribution grid structure includes the following steps:

[0096] Step 1: Construct the grid structure of the distribution network according to the power sources and load points in the power supply area;

[0097] Step 2: Calculate the grid topology level value after converting the grid structure into an authorized network;

[0098] Step 3: Calculate the load transfer rate and power supply reliability rate according to the grid structure;

[0099] Step 4: After standardizing the grid topology level value, load transfer rate and power supply reliability rate, the entropy weight method is used to evaluate the struct...

Embodiment 2

[0172] Based on the method of embodiment 1, a system based on the method is provided, the system includes

[0173] The grid structure building module is used to build a single radial grid structure, a two-segment two-connection grid structure, a three-supply grid structure and a single-ring grid structure according to the power supply and load points in the power supply area;

[0174] The grid topology level value calculation module is used to convert the grid structure into a weighted network, and use the depth-first search method to search for the path of the undirected weighted network to calculate the length of each branch, so as to calculate the key node distance of different grid structures ratio, key branch distance ratio, node power supply performance and branch power supply performance;

[0175] The load transfer rate calculation module is used to calculate the load transfer power of different grid structures to represent the load transfer capacity of the distribution...

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Abstract

The invention discloses a method and system for evaluating the grid structure strength of a medium-voltage power distribution network, and relates to the field of grid structure strength evaluation. The method comprises the steps of 1, constructing a grid structure of a power distribution network according to a power supply and a load point in a power supply area; 2, converting the grid structureinto a weighted network, and then calculating a grid topology level value; 3, calculating a load transfer rate and a power supply reliability rate according to the grid structure; and 4, standardizingthe topological level value, the load transfer rate and the power supply reliability of the grid structure, and evaluating the structural strength of the grid structure by adopting an entropy weightmethod. According to the method, the power distribution network strength is represented from multiple angles by selecting the topological level values (key node distribution distance ratio, key branchdistribution distance ratio, node power supply efficiency and branch power supply efficiency) of the grid structure and the power supply capacity (load transfer capacity and power supply reliability)of the power grid to users; the entropy weight method is combined with multiple indexes to calculate the strength, and multi-angle evaluation of the strength is achieved.

Description

technical field [0001] The invention relates to the field of evaluating the strength of grid structures, in particular to a method and system for evaluating the strength of grid structures of medium-voltage distribution networks. Background technique [0002] The structural strength of the distribution network grid refers to the ability of different grid structures of the distribution network to withstand various disturbances and maintain safe and stable operation, that is, the ability to meet the current power demand, meet a certain load transfer capacity, and meet the load growth. And the ability to meet the security of the grid structure belongs to the field of generalized power system security theory. In the existing power system security analysis theories, those that are positively correlated with robustness are: power system robustness, survivability, and invulnerability, etc.; those that are negatively correlated are: power system vulnerability, risk, etc. , and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06Y04S10/50Y02E40/70
Inventor 郝文斌卢光辉
Owner CHENGDU POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER
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