Neutral point disperse grounding type two-terminal direct current bipolar transmission system

Abstract

The invention discloses a neutral point disperse grounding type two-terminal direct current bipolar transmission system which comprises first pole leads and second pole leads which are symmetrically arranged according to transmission and form a loop. A current converter is respectively arranged between one end of each first pole lead and one end of an adjacent second pole lead and between the other end of the first pole lead and the other end of the adjacent second pole lead, and the current converters are symmetrically arranged. First grounding pole leads and second grounding pole leads which are mutually connected are respectively symmetrically arranged on two sides in the loop formed by the first pole leads and the second pole leads. The neutral point disperse grounding type two-terminal direct current bipolar transmission system further comprises two-terminal direct current systems which are respectively connected between the first grounding pole leads and the second grounding pole leads and are symmetrically arranged. The neutral point disperse grounding type two-terminal direct current bipolar transmission system reduces electric energy loss, has good diversion and transfer effects, is improved in line lightning protection capability, is large in coupling ground wire diversion effect, and greatly improves line lightning protection level; reduces direct current single electrode locking failure occurrence rate, greatly reduces line construction investment, and improves influence on ecological environment; and more importantly, greatly protects ecology in initially planned grounding pole address areas due to removal of grounding-pole pole addresses.

Description

technical field [0001] The invention relates to the technical field of power transmission systems, in particular to a neutral-point distributed grounding DC bipolar power transmission system at both ends. Background technique [0002] At present, two-terminal DC bipolar power transmission systems have three construction methods: two-wire system, two-wire system and three-wire system. All three methods need to build a dedicated grounding pole site near the converter station during line design, and erect The dedicated grounding pole line from the neutral point of the converter station to the grounding pole site. However, in the actual construction of the line, due to the economic development of the region where the line passes, the maturation of residential areas and the maturity of the land use planning, the high-voltage lines are also relatively dense, and the land resources are very tight. Due to the ecological benefits of concentrated current entering the ground and stric...

AI Technical Summary

Problems solved by technology

Although the function of switching to a single-pole neutral metal circuit can be realized when the line fails, the total length of the UHV DC line is often thousands of kilometers, and the investment cost of adding a set of wires and its attached insulator fittings, iron tower structure and foundation improvement is often Higher than the two-line system

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