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Method and device for obtaining synthetic ground electric field of high-voltage DC transmission split form line

A technology of high-voltage direct current transmission and synthesizing electric field, which is applied in electrical digital data processing, special data processing applications, instruments, etc., to achieve the effects of easy modeling, high computing efficiency and high precision

Active Publication Date: 2017-03-29
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

When the high-voltage DC line adopts the split type line, the domestic and foreign literature has not involved the research on the calculation method of the surface roughness coefficient of the wire and the ground synthetic electric field

Method used

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  • Method and device for obtaining synthetic ground electric field of high-voltage DC transmission split form line
  • Method and device for obtaining synthetic ground electric field of high-voltage DC transmission split form line
  • Method and device for obtaining synthetic ground electric field of high-voltage DC transmission split form line

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Embodiment 1

[0047] Refer to attached figure 1 with attached figure 2 , this embodiment adopts a horizontally arranged ±1100kV DC transmission line, adopts 6 split conductors, the sub-conductor model is JL1X / LHA1-1040 / 550, the split spacing is 50cm, the minimum height of the conductors to the ground is 22m, and the pole spacing is 20m.

[0048] The specific calculation method of this embodiment is as follows: the split wire is equivalently replaced by a single wire, and an optimized simulation charge calculation model for solving the nominal electric field and the surface electric field is established according to the physical characteristics of the split wire. After determining the number of arc segments on the outer surface of the split profile, select M matching points on each arc of the outer surface of the split profile; according to the formula R n =0.65r n Determine the position of the simulated charge: in the formula, n is the arc of the outer surface of the nth segment splittin...

Embodiment 2

[0053] Refer to attached figure 1 with attached figure 2 , this embodiment adopts a horizontally arranged ±1100kV DC transmission line, adopts 6 split conductors, the sub-conductor model is JL1X / LHA1-1040 / 550, the split spacing is 50cm, the minimum height of the conductors to the ground is 22m, and the pole spacing is 20m.

[0054] The device of the present embodiment adopts personal computer PC, and carries out modular programming on MATLAB, and concrete operation steps are as follows:

[0055] Firstly, the operation of the first calculation module is performed. According to the physical characteristics of the splitting line, an optimized simulation charge calculation model for solving the nominal electric field and the surface electric field is established. After determining the number of arc segments on the outer surface of the split profile, select M matching points on each arc of the outer surface of the split profile; according to the formula R n =0.65rn Determine th...

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Abstract

The invention discloses a method and device for obtaining a synthetic ground electric field of a high-voltage DC transmission split form line. The method comprises the steps of building an optimized simulation charge calculation model of solving a nominal electric field and a surface electric field according to physical characteristics of the split form line and solving the nominal electric field, nominal potential and the surface electric field; and calculating the ratio of a surface roughness coefficient of the split form line to the surface roughness coefficient of a steel-cored aluminum strand according to self-sustained conditions of wire corona discharge, and substituting the ratio into a Peek's formula to solve the corona inception field intensity. A space charge density value and a final value of a scalar function are iteratively solved through a secant method in numerical analysis, and the final value of the scalar function is multiplied by the solved nominal electric field to obtain the synthetic ground electric field. The method and the device have the characteristics of being easy to model, convenient to operate, high in accuracy and wide in application range, and can be used for the technical fields of ultra-high voltage power transmission, an engineering electromagnetic field and the like.

Description

technical field [0001] The invention relates to a method for obtaining a ground synthetic electric field of a high-voltage direct current transmission line, in particular to a method and a device for obtaining a ground synthetic electric field of a UHV direct current transmission line, belonging to the technical field of engineering electromagnetic fields. Background technique [0002] High-voltage direct current transmission (HVDC) refers to a high-power long-distance direct current transmission method. The power transmission process is direct current, and it is often used in overhead line power transmission, submarine cable power transmission, and communication between asynchronous AC systems. Ultra-high voltage direct current transmission (UHVDC) refers to direct current transmission and related technologies with a voltage level of ±800kV (±750kV) and above. The main characteristics of UHV DC transmission are large transmission capacity, long transmission distance and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10Y02E60/00
Inventor 刘元庆吴桂芳杨勇陆家榆赵录兴张喜润邓义茂
Owner CHINA ELECTRIC POWER RES INST
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