Confluence field of multi-end flexible direct-current electric transmission system

Abstract

The invention discloses a confluence field of a multi-end flexible direct-current electric transmission system. The confluence field comprises a confluence field bus, at least three ends of direct-current cable incoming lines are connected with the confluence field bus, a lightning arrester, a current measuring device and an isolation switch are connected between each end of direct-current cable incoming line and the confluence field bus, two ends of direct-current cable incoming lines are connected with the two ends of the confluence field bus respectively, and a single bus wiring mode is adopted as the wiring mode of the confluence field. Because the at least three ends of direct-current cable incoming lines are connected with the confluence field bus in different directions and the lightening arrester, the current measuring device and the isolation switch are arranged between each end of cable and the confluence field bus, energy convergence and distribution for multi-power source power supply and multi-drop point electricity receiving is achieved. Because the single bus wiring mode is adopted, segmented arrangement is not needed, the wiring mode is simple and practical, the economical efficiency is good, and the wiring requirement of the multi-end flexible direct-current electric transmission system is met.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a confluence field of a multi-terminal flexible direct current transmission system. Background technique [0002] Flexible DC transmission technology has developed rapidly abroad. Since the world's first flexible DC transmission project was put into industrial test operation in 1997, there have been many flexible DC transmission projects in foreign countries put into commercial operation, and the transmission capacity has reached hundreds of MW. Mainly used in wind power generation, grid interconnection, offshore drilling platform power supply and other fields. [0003] At this stage, the general DC transmission mostly adopts two-terminal flexible DC transmission, which has only two connection ports with the AC transmission system, and a converter station is installed at each port, which belongs to the double-terminal system and can only realize point...

AI Technical Summary

Problems solved by technology

[0003] At this stage, the general DC transmission mostly adopts two-terminal flexible DC transmission, which has only two connection ports with the AC transmission system, and a converter station is installed at each port, which belongs to the double-terminal system and can only realize point-to-point power transmission. It cannot meet the needs of multi-power supply and multi-drop power receiving, and when the converter station at one end fails and exits, the entire DC system will be in a paralyzed state