A Design Method for Distributed Grounding Electrode Used in HVDC Transmission System

Abstract

Disclosed is a distributed grounding electrode design method for a high-voltage direct-current transmission system. The distributed grounding electrode design method includes the steps of 1), preliminarily selecting the scope for grounding electrodes to be established according to planning and land expropriation, and determining the best position for the grounding electrodes to be established through a global optimal position mutation particle swam optimization algorithm; 2), determining the biggest potential rise of sub-electrodes according to temperature rise of the grounding electrodes and checking step potential; 3), connecting all the grounding electrodes with newly established sub-electrodes through an overhead line; 4), establishing a unified model for the distributed grounding electrodes and direct-current distribution of a alternating-current network; 5), according to the solved direct-current distribution of the alternating-current network, predicting risks of direct-current magnetic bias occurring to transformers of the alternating-current network; 6), for the transformers with the risks of direct-current magnetic bias in prediction, taking measures to restrain or eliminate negative influence brought by the problem of the direct-current magnetic bias. By the distributed grounding electrode design method, the risks of the direct-current magnetic bias can be reduced, and the degree of the direct-current magnetic bias after establishment of the grounding electrode can be estimated, so that damage brought by the direct-current magnetic bias can be reduced.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission engineering design, in particular to a design method for distributed grounding electrodes of a high-voltage direct current transmission system. Background technique [0002] At present, my country's receiving end converter stations are often located in economically developed areas, where the population density is high, the grid structure is huge and complex, and there are many underground metal facilities (such as oil and gas transmission and water supply pipelines, etc.), which makes the traditional conventional grounding electrode Under the design mode, the site selection of DC grounding electrode becomes more and more difficult. At the same time, with the massive operation of large-capacity UHV DC transmission projects, the problems of electromagnetic compatibility caused by the DC transmission ground current and the harmonics of the converter station have become more prom...

AI Technical Summary

Problems solved by technology

[0004] However, the site selection of traditional distributed grounding poles does not consider the degree of influence of the DC current into the ground on the AC grid, so that it is impossible to predict the risk of DC bias of each transformer in the AC grid, resulting in the inability to predict the risk of DC bias for transformers with a high risk of DC bias. Take measures, which will lead to losses due to DC bias problems after the new grounding pole is put into operation

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