Computation method of surface synthesis electric field of small grounding object under DC (direct current) power transmission line

A technology of direct current transmission lines and calculation methods, which is applied in calculation, electrical digital data processing, special data processing applications, etc., can solve problems such as complex calculation methods, achieve the effect of reducing calculation complexity and ensuring accuracy

Inactive Publication Date: 2012-03-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a calculation method for the synthetic electric field on the surface of a small groun...

Method used

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  • Computation method of surface synthesis electric field of small grounding object under DC (direct current) power transmission line
  • Computation method of surface synthesis electric field of small grounding object under DC (direct current) power transmission line
  • Computation method of surface synthesis electric field of small grounding object under DC (direct current) power transmission line

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Experimental program
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Embodiment 1

[0033] The given DC line is a bipolar six-split ±800kV DC transmission line, the line height is 18 meters, the pole spacing is 22 meters, the conductor splitting distance is 45cm, and the sub-conductor model is LGJ-630.

[0034] The calculation method of the synthetic electric field on the surface of the small grounded object under the direct current transmission line provided by the present invention includes:

[0035] Step 1: When there is no object under the DC transmission line, use the two-dimensional ion flow field calculation method to calculate the charge density at each point in space.

[0036] According to the basic equation describing the DC ion flow field, the speed of positive and negative ions moving in the ion flow field is affected by three factors: ion migration, ion diffusion and wind speed under the action of electric field force. After ignoring the influence of charge diffusion, the movement speed of its positive and negative ions can be expressed as:

[0...

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Abstract

The invention discloses a computation method of a surface synthesis electric field of a small grounding object under a DC (direct current) power transmission line, belonging to the technical field of electromagnetic environment analysis of extra-high voltage and ultra-high voltage DC power transmission lines. The computation method comprises the following steps that: when the small grounding object does not exist under the DC power transmission line, a two-dimensional ion flow field computation method is used for computing the charge density of each point in the space; and when the small grounding object exists under the DC power transmission line, a three-dimensional electrostatic field computation method is used for acquiring the surface synthesis electric field of the object according to the charge density of each point in the space in the two-dimensional ion flow field computation result. The method disclosed by the invention reduces the computation complexity on the premise of ensuring the accuracy of the computation result.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic environment analysis of ultra-high voltage and ultra-high voltage direct current transmission lines, and in particular relates to a method for calculating a synthetic electric field on the surface of an object under a direct current transmission line. Background technique [0002] my country is one of the countries with extremely unbalanced energy distribution and economic development in the world. The State Grid Corporation of China has proposed a development strategy to realize the optimal allocation of national energy resources and ensure national energy security by building a strong smart grid with UHV grid as the backbone grid. The DC transmission system plays an important role in this process. At present, a large number of DC projects have been completed in my country, including Genan, Tianguang, Sanguang, Sanchang, Guiguang, Sanhu, Lingbao, and many other large-scale projects. , and...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 崔翔甄永赞卢铁兵
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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