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A Calculation Method of the Electric Field Under the Crossover Area of ​​AC-DC Transmission Lines

A technology of AC and DC power transmission and line crossing, applied in computing, data processing applications, instruments, etc., can solve problems such as lack of accurate and fast algorithms

Active Publication Date: 2020-07-14
POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is currently no accurate and fast algorithm for the calculation of the electric field and ion flow field below the crossing area of ​​ultra-high voltage DC transmission lines and AC transmission lines

Method used

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  • A Calculation Method of the Electric Field Under the Crossover Area of ​​AC-DC Transmission Lines
  • A Calculation Method of the Electric Field Under the Crossover Area of ​​AC-DC Transmission Lines
  • A Calculation Method of the Electric Field Under the Crossover Area of ​​AC-DC Transmission Lines

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Embodiment Construction

[0081] Below in conjunction with accompanying drawing, method of the present invention is described in further detail:

[0082] Fig. 2a) and Fig. 2b) are the model diagrams of the transmission line when the AC-DC transmission line crosses over, wherein Fig. 2a) is a cross-sectional view of the DC line made perpendicular to the DC transmission line, and Fig. 2b) is made perpendicular to the AC transmission line A cross-sectional view of an AC transmission line, in which some parameters of the transmission line are marked. The boundary condition of the model is to set the potential of the ground and the potential of the ground wire to 0, and the potential on the wire is equal to the voltage applied to the wire at the current moment. Therefore, at different instants, only the potential on the AC wire changes in the boundary condition. Based on the figures shown in Fig. 2a) and Fig. 2b), the calculation method of the electric field under the intersecting region of the AC / DC trans...

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Abstract

The invention discloses a calculation method for an electric field under the crossing area of an alternating current-direct current power transmission line, and relates to the field of the high-voltage power transmission technology and electromagnetic field calculation. The calculation method comprises the following steps that: calculating the nominal electric field of each space joint at a certain moment, initializing space charge density, calculating a synthesis electric field, applying a method of characteristics to update space charge density distribution on an electric field line, calculating space charge density corresponding to different moments on the space node, and carrying out convergence judgment so as to obtain the electric field under the crossing area of the alternating current-direct current power transmission line. The calculation method disclosed by the invention has the characteristics of accurate calculation result and small calculation workload.

Description

technical field [0001] The invention relates to the fields of high-voltage power transmission technology and electromagnetic field calculation, and is used for calculating the electric field under the ultra-high voltage AC transmission line and the DC transmission line when they cross and cross. Background technique [0002] Due to the current passing through the transmission line, the transmission line itself will generate a nominal electric field in its surrounding space, and due to the corona phenomenon of the transmission line, the air around the transmission line will be ionized to form charged particles. When corona occurs on the AC transmission line, due to the periodic change of the polarity of the conductor voltage, the ions generated by air ionization due to corona discharge in the first half cycle are almost all pulled back to the conductor due to the change of voltage polarity in the second half cycle , so that the ionized ions are basically bound near the wire, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/06
CPCG06Q50/06
Inventor 闫建兴王炜王延杰
Owner POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD