Method for calculation of characteristic lines of three-dimensional ionized field of direct current transmission line

Abstract

The present invention discloses a method for calculation of characteristic lines of a three-dimensional ionized field of a direct current transmission line. The method can be used for calculation of direct current three-dimensional ionized fields of line crossing and around the surface structures and insulators. The method comprises: giving an assumed distribution of a space electric field and of space charges, calculating a new space electric field distribution by employing the space charges through the Poisson equation, and painting characteristic lines; solving the charge distribution on the characteristic lines according to the new space electric field distribution through the ion current equation and the current continuity equation; and repeating the steps mentioned above until the distributions of two successive space charges is in an allowable error range, and performing calculation of combination of the electric field and the ion current density. Compared to the Deutsch hypothesis method, the method for calculation of characteristic lines of the three-dimensional ionized field of direct current transmission line considers the influence of the space charges and is more accurate in calculation result; and moreover, compared to the finite element method, the method for calculation of characteristic lines of the three-dimensional ionized field of direct current transmission line greatly increases the update efficiency of charges and is obviously better than the finite element method on the computational efficiency.

Description

technical field [0001] The present invention relates to the field of high-voltage power transmission technology and electromagnetic field calculation, and in particular to a method for calculating the characteristic line of the three-dimensional ion flow field of DC transmission lines, which is used to calculate the cross-over, the presence of buildings on the ground, the surrounding of insulators and other DC transmission lines caused by corona 3D ion flow field. Background technique [0002] During the construction of the UHV DC transmission project, the electromagnetic environment of the line is a major issue related to the design, construction and operation of the system. Due to the corona phenomenon of the line, the surrounding air is ionized to form charged particles. In the entire area between the bipolar wires and between the polar wires and the ground, space charges will be filled, which will distort the nominal electric field generated by the wire charges, and the...

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Problems solved by technology

The stability of the upstream finite element method is good, but when the calculation area is a complex model or a large-scale building, the calculation amount is huge and the cost is high, so the current application is limited to the unipolar ion flow field. Cannot be fully adapted and generalized to the practical problem of ionic flow fields in bipolar transmission lines

[0005] In general, the solution of the Deutsch assumption is very inaccurate due to the assumption that the direction of the actual space electric field is not affected by the charge generated by the space charge

However, the 3D finite element calculation design area is large and the boundary is complex, which means that the finite element method has a large amount of mesh division, and calculation iterations need to occupy a large amount of storage resources. It is impossible to develop a 3D ion flow field for various environments and line specifications in practice. calculate

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