Method for calculating ultra-fast transient radiation electromagnetic field based on time domain finite difference method
A time-domain finite difference, radiated electromagnetic field technology, applied in design optimization/simulation and other directions, can solve the problem of inability to accurately assess the electromagnetic radiation risk of secondary side equipment
Pending Publication Date: 2020-07-10
GUIZHOU POWER GRID CO LTD
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a calculation method based on the time-domain finite difference method for extremely fast transient radiation electromagnetic fields, so as to solve the problem that the existing technology cannot accurately estimate the electromagnetic radiation risk of the secondary side equipment when the GIS substation switch is operated. Evaluation and other technical issues
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[0046] By referring to the accompanying drawings and examples, fully introduce exemplary embodiments of the present invention, the specific implementation process is as follows figure 1 shown, including the following steps:
[0047] step one:
[0048] The interference source of the transient space electromagnetic field generated when the GIS switch is operated is not only the VFTO and VFTC inside the GIS shell, but also the TEV outside the shell and the transient circulation of the shell through coupling.
[0049] The interference source inside the GIS shell propagates inside the GIS in the form of electromagnetic waves. When the electromagnetic waves propagate in the space medium, they will be lost and their energy will gradually weaken. When the electromagnetic wave propagates inside the GIS shell, the expression of the propagation coefficient Γ is as follows:
[0050]
[0051] Among them, ε is the dielectric constant, μ is the magnetic permeability, σ is the electrical c...
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The invention discloses a method for calculating an ultra-fast transient radiation electromagnetic field based on a time domain finite difference method. The method comprises the following steps: 1, analyzing a switch operation radiation generation mechanism and GIS shell radiation electromagnetic field characteristics; 2, establishing an antenna radiation physical model in the XFDTD, dividing grids by adopting a time domain finite difference method, and establishing a PML boundary; 3, introducing a shell transient loop current as an excitation source, and performing simulating to obtain the distribution characteristics of an affiliated electromagnetic field. In the prior art, an electromagnetic radiation risk of secondary side equipment during GIS transformer station switch operation cannot be accurately assessed and so on.
Description
technical field [0001] The invention belongs to the field of high-frequency electromagnetic field calculation, and in particular relates to a calculation method for a fast transient radiation electromagnetic field based on a time-domain finite difference method. Background technique [0002] GIS gas insulated substation has been widely used in high voltage and extra high voltage systems due to its safety, reliability, stable operation, and excellent performance. During the development of GIS substations, the problem of transient electromagnetic interference in GIS switch operation has gradually attracted attention, especially in high-voltage and ultra-high voltage systems, the problem of ultra-fast transient electromagnetic radiation becomes more and more serious with the increase of voltage level. With the strong smart grid of the State Grid and the ubiquitous power Internet of Things, in order to realize the digitalization of smart substation information, the networking of...
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IPC IPC(8): G06F30/23
Inventor 杨涛吴建蓉朱勇黄军凯许逵曾鹏肖彬刘岺俐郑海涯
Owner GUIZHOU POWER GRID CO LTD