A Unified Calculation Method for the Impact of DC Grounding Electrode on AC Power Grid and Oil and Gas Pipeline
A technology of AC power grid and DC grounding, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as mutual influence, neglect of AC power grid and metal buried pipelines, and achieve accurate results
Active Publication Date: 2018-07-24
TSINGHUA UNIV +1
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[0007] The purpose of the present invention is to provide a unified calculation method for the impact of DC grounding electrodes on AC power grids and oil and gas pipelines, so as to solve the problem of neglecting The problem of interaction between AC power grid and metal buried pipeline is solved
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[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0023] Aiming at the problem that the mutual influence between the AC power grid and the metal buried pipeline is ignored when analyzing the influence of the DC transmission line grounding electrode current on the AC power grid or the metal buried pipeline at the present stage, the present invention analyzes the AC power grid and the buried oi...
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The invention relates to the technical field of high voltage, in particular to a method for carrying out uniform calculation on influences, caused by DC grounding electrodes, on AC power grids and oil-gas pipelines. According to the method disclosed in the invention, a substation network model which is formed by electric transmission lines, resistors of substation transformers in the AC power grids and resistors of converter transformers in DC converter stations, and a pipeline model are established; when calculation is carried out on ground potential of each substation in the AC power grids, the influences of a first additional potential generated by leakage current of metal buried pipelines in the substation network model are considered; and meanwhile, when calculation is carried out on the ground potentials of the pipelines, the influences of a second additional potential generated by earth current at neutral point grounding places of the AC power grids in the metal buried pipeline model are influenced. Therefore, the problem that the mutual influence between the AC power grids and the metal buried pipelines is ignored when analysis is carried out on the influences, caused by the earth current of the grounding electrodes of the DC electric transmission lines, on the AC power grids or the metal buried pipelines in the current stage is solved.
Description
technical field [0001] The invention relates to the field of high-voltage technology, in particular to a unified calculation method for the influence of a DC grounding electrode on an AC power grid and oil and gas pipelines. Background technique [0002] When the DC transmission system operates in the single-pole ground mode, there will be a large DC current flowing into or out of the ground from the ground electrode. Especially in the UHV DC system, the DC current injected or extracted at the ground electrode can be as high as several thousand amperes. This current forms a potential distribution in the soil, which affects nearby AC power systems and buried oil and gas pipelines. [0003] First of all, the grounding current of the DC transmission line leads to the flow of DC current in the transformer whose neutral point is directly grounded, and the DC bias phenomenon of the transformer is serious, which further causes a series of serious problems such as increased heat ge...
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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 张波廖永力曹方圆李锐海何金良孟晓波庄池杰曾嵘
Owner TSINGHUA UNIV