Method for determining and segmenting grounding pole field domain of direct current (DC) transmission system

Abstract

The invention discloses a method for determining and segmenting a grounding pole field domain of a direct current (DC) transmission system. The method comprises the following steps of: (1) determining a field domain of a grounding pole according to the shape of the grounding pole; and (2) performing three-dimensional segmentation on the field domain of the grounding pole by using a fan segmentation method or a rectangle segmentation method according to the shape of the grounding pole so as to obtain a plurality of unit blocks. In the method for determining and segmenting the grounding pole field domain, the range of the grounding pole field domain is determined according to the shape of the grounding pole, a current field calculating area is defined in a certain range, the analysis of an open field in an actual system is avoided, and a computation model is simplified on the premise of guaranteeing the precision; meanwhile, non-uniform segmentation is adopted under the conditions of different depths and ranges, the segmentation is denser close to an electrode and is sparse away from the electrode, the computational accuracy and speed are considered, the field domain is finely determined and segmented, and the method is simple and high in university; therefore, the computed result of the grounding pole current meets the high-precision requirement.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission, and in particular relates to a method for determining and dividing a ground electrode field of a direct current transmission system. Background technique [0002] Typical shapes of DC transmission grounding electrodes are mainly divided into: straight line, star, ring and runway. At present, the most widely used are ring-type and runway-type grounding electrodes, which can be subdivided into single-ring, double-ring, three-ring and other shapes according to the number of rings. figure 1 Shown is the layout structure and cross-sectional schematic diagram of a single ring type grounding electrode. The overall shape of the grounding electrode is a ring, which is spliced ​​by several feeder rods, buried in the soil horizontally and shallowly, and the feeder rods are filled with a coke layer. Reduce the effect of electrocorrosion, and at the same time reduce the current den...

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Problems solved by technology

[0005] It can be seen from the above that this type of algorithm involves the determination and segmentation of the field range of the ground electrode. However, the existing field range determination method is relatively general, and its segmentation method is relatively rough. The calculation effect is not very ideal, and the accuracy is not high; thus As a result, the reliability of the calculation results of the ground electrode current field is not high, which in turn affects the relevant design and construction, and there are corresponding safety hazards

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