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A Method for Constructing Thermal Stability Safety Domain of 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: 2022-05-17
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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  • A Method for Constructing Thermal Stability Safety Domain of Power System
  • A Method for Constructing Thermal Stability Safety Domain of Power System
  • A Method for Constructing Thermal Stability Safety Domain of 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 safety region of a power system, comprising: obtaining a reconstruction value set according to a predicted value set and a residual set; The coefficient set of the analytical expression of the approximate hyperplane of the thermal stability security boundary under N‑1; according to the coefficient set, calculate the initial mean and initial standard deviation of the empirical distribution function of each coefficient; repeat the above two steps several times to obtain the bootstrap sampling-based The bootstrap mean and bootstrap standard deviation of the empirical distribution function; according to the bootstrap mean and bootstrap standard deviation, combined with the t distribution and χ in probability theory and statistics 2 The distribution approximates the mean and standard deviation of the empirical distribution function corresponding to branch k, and calculates the corresponding confidence interval, and then obtains the approximate hyperplane expression corresponding to 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 Patents(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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