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Calculation method for ground resultant electric field of DC transmission line

A technology of DC transmission lines and calculation methods, applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of low precision, different grasps, and different results.

Inactive Publication Date: 2012-06-20
STATE GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is more convenient to use the analog charge method to calculate the DC combined field, and it can predict the distribution of the DC combined field under the line very well, but because the calculation model of this method is relatively simple, the accuracy of the result is not high
When using the finite element method to calculate the DC synthetic field, the details of the model are carefully considered, and the influence mechanism of each influencing factor can be reflected in the modeling process. However, since there are many factors affecting the DC synthetic field, the modeling process It is more complicated, and the grasp of various details in the modeling process is different, and the results obtained are not the same

Method used

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  • Calculation method for ground resultant electric field of DC transmission line
  • Calculation method for ground resultant electric field of DC transmission line
  • Calculation method for ground resultant electric field of DC transmission line

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but these examples should not be construed as limiting the present invention.

[0017] The present invention first adopts the finite element method to model the actual transmission line, and calculates the resultant field on the ground of the DC line. electric field in the case. Specifically:

[0018] (1) Overview of formula derivation and solution

[0019] According to Gauss' theorem, it can be concluded that

[0020] ▿ · E = ( ρ + - ρ - 1 ) / ϵ 0 - - - ( 1 - 1 )

[0021] The mechanism o...

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Abstract

The invention relates to a calculation method for a ground resultant electric field of a DC transmission line. In the method, a practical transmission line is modeled by finite elements so as to calculate the ground resultant field of the DC transmission line, the in modeling process, the calculation accuracy for the electric field on a conductor surface is improved by a sub-domain; based on mathematical methods, the electric field with existence of space charge is calculated, and finally, the more accurate ground resultant field calculation method is obtained. The test data obtained from tests shows that the method of the invention has higher accuracy, and can be used for calculation of the DC resultant field of a high-voltage DC power line in the future.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation engineering, and specifically relates to a method for predicting a DC synthesis field of a DC transmission line. Background technique [0002] In recent years, the construction of DC transmission lines in my country has developed rapidly, and the electromagnetic environment around DC transmission lines has attracted more and more attention. The resultant field is the main electromagnetic environment parameter of the DC transmission line, and the prediction of the ground resultant field under the DC line has become an important task in the selection of line conductors. [0003] At present, the methods for calculating the DC resultant field are mainly divided into the finite element method and the simulated charge method. It is more convenient to use the analog charge method to calculate the DC combined field, and it can predict the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 邬雄陈豫朝张建功周兵张泽平
Owner STATE GRID ELECTRIC POWER RES INST