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Method for calculating corona conductance of direct-current power transmission line

A technology of direct current transmission lines and calculation methods, applied in the directions of measuring resistance/reactance/impedance, measuring electricity, measuring electrical variables, etc., can solve problems such as inaccurate description of corona phenomenon

Inactive Publication Date: 2012-07-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

[0005] In view of the deficiency that the existing DC transmission simulation model mentioned in the above background technology cannot accurately describe the corona phenomenon, the present invention proposes a calculation method for the corona conductance of DC transmission lines

Method used

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  • Method for calculating corona conductance of direct-current power transmission line
  • Method for calculating corona conductance of direct-current power transmission line
  • Method for calculating corona conductance of direct-current power transmission line

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Embodiment 1

[0023] Step 1: Obtain the potential and corona losses for a given bipolar line in normal operation;

[0024] Consider a ±500kV DC transmission line, when the bipolar is in normal operation, the corona loss power is 4.55kW / km.

[0025] Step 2: Obtain the absolute value of the highest potential of the standby pole line when one pole line of a given bipolar line is in normal operation and the other pole line is in standby;

[0026] Single pole standby, when the other pole is in normal operation, the absolute value of the potential of the standby pole is up to about 100kV.

[0027] Step 3: Calculate the conductance between the bipolar lines and the conductance between the lines to ground.

[0028] details as follows:

[0029] Let the positive and negative electrode potentials be U and -U respectively during normal operation, the corona loss of the line is P, and the conductance in the attached figure is G respectively. 1 , G 2 and G 3 , where G 1 =G 3 . Unipolar normal ope...

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Abstract

The invention discloses the technical field of power systems, and in particular relates to a method for calculating corona conductance of a direct-current power transmission line. The method comprises the following steps of: acquiring the potential and the corona loss of the given bipolar line during normal operation; when one polar line of the given bipolar line runs normally and the other polar line of the given bipolar line is spare, acquiring the absolute value of the highest potential of the spare polar line; and finally calculating the conductance between the lines and the conductance between the line and the ground. By the method, the corona phenomenon can be accurately described, so that adverse influence of the phenomenon on the running control of the system can be avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for calculating the corona conductance of a DC transmission line. Background technique [0002] The regional distribution of energy and economy in my country is extremely unbalanced. The energy centers are mainly distributed in the western region, whether it is hydropower or thermal power, while the economic centers are mainly distributed in the eastern region. Therefore, it is necessary to build a solid grid structure to realize long-distance and large-capacity transmission of electricity. The DC transmission system plays an important role in this. Compared with the AC transmission system, it has its special advantages in terms of long distance and large capacity. At present, our country has built a large number of DC projects, including many large-scale projects such as Genan, Tianguang, Sanguang, and Xiangshang, and a large number of DC tra...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R31/00
Inventor 崔翔甄永赞卢铁兵
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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