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A full-dimensional observation method for distribution network security domain

A technology of security domain and distribution network, applied in the field of full-dimensional observation of the security domain of distribution network, can solve the problem that all defects and overall characteristics of DSSR cannot be guaranteed.

Active Publication Date: 2020-07-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The observation results of the above visualization method are related to the selection of the working point, and can only observe the local information of the limited dimension of the security domain, and cannot guarantee to find all the defects and overall characteristics of the DSSR (distribution network security domain)

Method used

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  • A full-dimensional observation method for distribution network security domain
  • A full-dimensional observation method for distribution network security domain
  • A full-dimensional observation method for distribution network security domain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A full-dimensional observation method of distribution network security domain, see Image 6 , the full-dimensional observation method includes the following steps:

[0043] 101: Calculate the distance from the zero load point of the distribution network safety domain to all effective safety boundaries, define the distance from the zero load point to each effective safety boundary as the radius, define the average distance as the average radius, and define the maximum distance as the maximum Radius, minimum distance is defined as the minimum radius;

[0044] 102: Visually observe the depression and roundness of the distribution network security domain through the visualization results of the distribution network security zone radius scatter diagram and radar chart;

[0045] 103: Find the concave boundary and quantify the defects of the distribution network security domain through the indicators of the depression degree of the distribution network security domain and the...

Embodiment 2

[0049] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0050] In the embodiment of the present invention, the safety distance of the origin is defined as the radius of the DSSR, represented by R. The general formula for calculating the radius is as follows:

[0051] R=|A'(AA') -1 (Ax-β)| (1)

[0052] In the formula, A is an n-dimensional normal vector, A' is the transpose of A, and β is a constant.

[0053] mean radius R avg is the mean value of the DSSR radius, the formula is:

[0054]

[0055] Maximum radius R max is the maximum value of the DSSR radius,

[0056] R max =max{R 1 , R 2 ,...,R m} (3)

[0057] Minimum radius R min is the minimum value of the DSSR radius,

[0058] R min =min{R 1 , R 2 ,...,R m} (4)

[0059] R in formula (2)-(4) i Represents the distance from the origin to the i-th effective security boundary, and m represents...

Embodiment 3

[0081] 1. Basic situation of calculation example 1

[0082] Calculation example 1 grid structure such as figure 1 As shown, there are two 35kV substations and four 10kV feeders, with a total transformation capacity of 26MVA. See Table 1 for substation and feeder data.

[0083] Table 1 Substation data of calculation example 1

[0084]

[0085]

[0086] 1) Calculate the radius of the DSSR

[0087] List the safety boundary expression of the power grid in Example 1, and then eliminate the invalid boundary, the results are shown in Table 2.

[0088] Table 2 DSSR effective safety boundary equation of Calculation Example 1

[0089]

[0090] The DSSR radius of Calculation Example 1 is calculated, and the results are shown in Table 3.

[0091] Table 3 DSSR radius of Example 1

[0092]

[0093] 2) Observing and discovering defects in the security domain through visualization and indicators

[0094] According to the observation data results in Table 3, the scatter diag...

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Abstract

The invention discloses a full-dimensional observation method for a distribution network security domain. The method comprises the following steps: calculating distances from a zero load point to alleffective safety boundaries in a distribution network security domain and defining each distance as a radius; according to visualization results of a radius scatter diagram and a radar chart of the distribution network security domain, observing recession and roundness degrees of the distribution network security domain visually; quantifying defects of the distribution network security domain by an index representing the recession degree of the distribution network security domain and an index of representing the roundness degree; and analyzing a defect generation cause of the distribution network security domain based on a physical meaning of an expression of the safety boundary corresponding to the recession, changing the connection structure or the capacity of the element like the maintransformer or feeder line of the distribution network to change the radius and distribution of the distribution network security domain, thereby overcoming the defect of the distribution network security domain. With the method disclosed by the invention, the morphology of high-dimensional domain is observed completely; the hidden defect that can not be discovered by the projection method is discovered; and a novel tool is provided for the analysis of the distribution network security domain.

Description

technical field [0001] The invention relates to the field of distribution network security domains, in particular to a full-dimensional observation method for distribution network security domains. Background technique [0002] In the future smart distribution network, the security domain method is a very powerful new theoretical method, which has good prospects in the future distribution network security monitoring and preventive control. [0003] Since the security domain itself contains a wealth of information, how to discover and interpret this information is very important for the application of the security domain method. The existing ideas are mainly divided into two categories: one is the numerical calculation related to the security domain. For example, references [1] and [2] describe the safety margin of the power grid by calculating the distance from the operating point to the boundary of the safety domain, and respectively establish the concept and model of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/06
Inventor 肖峻张宝强邵经鹏张苗苗
Owner TIANJIN UNIV