A large electric system vulnerable line identifying method

A power system and identification method technology, applied in the direction of emergency protection circuit devices, electrical components, fault locations, etc., can solve the problems of combined explosion, ignoring the overall behavior of the system, and the large calculation time consumed by mathematical models, so as to speed up calculation and reduce The effect of calculation volume

Inactive Publication Date: 2007-06-06
ZHEJIANG UNIV
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Problems solved by technology

With the continuous expansion of the scale of the power system, this analysis method increasingly shows its limitations: ① pay too much attention to the individual dynamic characteristics of each component, while ignor

Method used

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  • A large electric system vulnerable line identifying method
  • A large electric system vulnerable line identifying method
  • A large electric system vulnerable line identifying method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] This method is used to identify vulnerable lines in the IEEE 39 example, and a total of 13 weak lines are selected with the betweenness of weighted lines exceeding 6000. Then use PST 2.0 software for time domain verification. Set a three-phase grounding short-circuit fault at the bus outlet with higher voltage at both ends of the line at 0.1 second, and clear the fault at 0.225 seconds (because the IEEE 39 node system is relatively strong, the fault within 100ms has little effect on the stability of the system , so extend the fault time to 125ms), and record the generator speed deviation curves of all 10 generators within 10 seconds. Except for those generators directly connected to the faulty line, if the generator speed deviation is not large and can finally return to the stable speed of the system, it is determined that this line is a non-fragile line, as shown by the dotted line in Figure 3; if If the generator speed deviation is too large and cannot return to the ...

Embodiment 2

[0062] The betweenness of each line with weight is obtained by identifying the vulnerable lines of Central China-Sichuan-Chongqing power grid. Arrange the 3142 lines from left to right in accordance with the value of the weighted lines, as shown in Figure 4. There is an inflection point in the curve at around 10000 between weighted lines. The betweenness value of the weighted line on the left side of the inflection point increases slowly; while the betweenness value of the weighted line on the left side of the inflection point increases much faster. This shows that there are a small number of lines with a high betweenness value between weighted lines in the network. Conservatively select lines with weighted line betweenness greater than 10,000 as fragile lines, a total of 571 lines.

[0063] Then use the PSASP6.2 power system comprehensive analysis application program for time domain verification. Set a three-phase grounding short-circuit fault at the bus outlet with higher...

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Abstract

A method for identifying weak line of large-scale power system includes defining line electric inductivity with weighting of the line to be load sum bore on and passed through shortest electric path between power generator and load in system then revising said path by raising electric inductivity index of line in power system to be maximum electric inductivity value of electric inductivity on all lines adjacent to said path.

Description

technical field [0001] The invention belongs to the technical field of power system security defense, and in particular relates to a method for identifying vulnerable lines in a power system. Background technique [0002] In recent years, frequent blackouts in power systems have drawn people's attention to large-scale cascading failures and the vulnerability of power systems. The vulnerability analysis of the power system has been established on the basis of differential equations, that is, through the establishment of detailed mathematical models for each component in the system, the dynamic analysis of the system is carried out in the form of time domain simulation. With the continuous expansion of the scale of the power system, this analysis method increasingly shows its limitations: ① pay too much attention to the individual dynamic characteristics of each component, while ignoring the overall behavior of the system; ② detailed mathematical models need to consume a lot o...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
Inventor 曹一家陈晓刚王绍部
Owner ZHEJIANG UNIV
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