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Method for constructing thermal stability security domain of electric power system

A power system and thermal stability technology, applied in the field of power systems, can solve time-consuming problems, achieve the effect of improving approximate efficiency and thermal stability

Active Publication Date: 2019-05-17
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, the search for the critical point is the most time-consuming part of the construction of the thermally stable security domain.

Method used

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  • Method for constructing thermal stability security domain of electric power system
  • Method for constructing thermal stability security domain of electric power system
  • Method for constructing thermal stability security domain of electric power system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A fast construction method of power system thermal stability safety domain based on Bootstrap sampling, see figure 1 , the method includes the following steps:

[0048] 101: According to the initial approximate hyperplane analytical expression, combined with the sub-set of the original thermal stability critical point set of branch k under N-1, obtain the approximate hyperplane prediction value set, the residual set and the empirical distribution function of the residual;

[0049] 102: According to the predicted value set and the residual set, obtain the reconstructed value set; based on the reconstructed value set and the sub-set of the original thermal stability critical point set, calculate the analytical expression of the approximate hyperplane of the thermal stability safety boundary under N-1 set of coefficients;

[0050] 103: Calculate the initial mean and initial standard deviation of the empirical distribution function of each coefficient according to the set ...

Embodiment 2

[0063] The scheme in embodiment 1 is further introduced below in conjunction with concrete calculation formula, example, see the following description for details:

[0064] 201: Obtain the initial approximate hyperplane analytical expression of the boundary of the power system thermal stability safety domain, including:

[0065] 1) Rewrite the approximate hyperplane of the boundary of the thermally stable safe domain described by formula (1) into the form shown in formula (2):

[0066]

[0067] In the formula, β k,0 , β k,1 ,...,β k,n Hyperplane coefficients for the approximation of the boundary of the thermally stable safe region satisfying the N-1 constraint of the k-th branch; is the critical operating point on the boundary of the thermally stable safety region where the power system satisfies the constraint of the k-th branch N-1, The elements in are the descriptive parameters of the power system, which can be branch current, branch active power, branch phase diff...

Embodiment 3

[0119] The following combined with specific examples, Figure 2-Figure 5 , and table 1, the scheme in embodiment 1 and 2 is carried out feasibility verification, see description below for details:

[0120] This example is to verify the effectiveness of Embodiments 1 and 2 of the present invention by constructing a certain single-line N-1 thermally stable security domain located at the Guangdong AC input section of the Southern Power Grid in the three-dimensional active power space as an example.

[0121] Obviously, the approximate hyperplane expression of the boundary of the single-line N-1 thermally stable safe domain described by equation (2) in three-dimensional space should be Long-term operation experience and research show that the key generator power injection nodes that affect the thermal stability of single-line N-1 are YX and TS.

[0122] Therefore, in the three-dimensional active power space, the coordinate axes are respectively selected as the total active power ...

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Abstract

The invention discloses a method for constructing a thermal stability security domain of an electric power system, comprising the following steps: according to a predicted value set and a residual set, acquiring a reconstructed value set; calculating a coefficient set of an analytical expression of a thermal stability security boundary approximate hyperplane under N-1 based on the reconstructed value set and a subset of an original thermal stability critical point set; according to the coefficient set, calculating an initial mean value and an initial standard deviation of an empirical distribution function of each coefficient; repeating the two steps for several times to obtain a bootstrap mean value and a bootstrap standard deviation of the empirical distribution function based on bootstrap sampling; and according to the bootstrap mean value and the bootstrap standard deviation, combining a probability theory and t distribution and x2 distribution of the statistics to approximate a mean value and a standard deviation of the empirical distribution function corresponding to a branch k, and calculating a corresponding confidence interval so as to obtain an approximate hyperplane expression corresponding to the branch k.

Description

technical field [0001] The present invention relates to the field of power systems, in particular to a bootstrap-based sampling [1] Rapid construction method of power system thermal stability security domain. Background technique [0002] At present, the N-1 thermal stability verification of the power system is completely based on the point-by-point limit calculation mode. This method is simple and easy to use, and has played a huge role in the operation planning of the power grid. However, with the continuous development of the grid scale and the large-scale grid integration of high-penetration renewable energy, this method has exposed more and more limitations, mainly reflected in: ①Below the N-1 thermal stability limit, the power The system may also have thermal stability violations; ②The limit calculation results are difficult to determine due to changes in the power system operation mode, and a fixed limit value is difficult to ensure the safety of N-1 thermal stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 李雪姜涛李国庆陈厚合张儒峰张嵩王长江李曙光李晓辉
Owner NORTHEAST DIANLI UNIVERSITY
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