1. Research on key technologies in ±1100 kV ultra‐high voltage DC transmission
- Author
-
Fuxuan Zhang, Keli Gao, Jun Yu, Weimin Ma, and Zehong Liu
- Subjects
Computer science ,flashover ,theoretical analysis ,arresters ,rod-plane air gaps ,02 engineering and technology ,HVDC power convertors ,01 natural sciences ,lightning arresters ,converter transformers ,law.invention ,law ,impulse flashover characteristics ,0202 electrical engineering, electronic engineering, information engineering ,Equipotential ,direct current transmission demonstration project ,Transformer ,010302 applied physics ,heavy pollution areas ,Electrical engineering ,wall bushings ,HVDC power transmission ,switching impulse flashover characteristics ,Electric power transmission ,reactors (electric) ,Electromagnetic shielding ,Air gap (plumbing) ,lcsh:TK1-9971 ,configuration scheme ,pole gap ,power transmission lines ,ultra-high voltage DC transmission ,020209 energy ,current 5523.0 A ,bushings ,lcsh:QC501-721 ,voltage 800.0 kV ,Energy Engineering and Power Technology ,converter stations ,air gaps ,equipotential sphere ,transmission technologies ,electromagnetic parameters ,lcsh:Electricity ,0103 physical sciences ,converter valves ,switching overvoltage ,Arc flash ,Electrical and Electronic Engineering ,ground lines ,business.industry ,reactors ,Direct current ,shielding angles ,poles and towers ,power transformers ,current 5000.0 A ,external insulation ,Overvoltage ,geographical conditions ,size 25.0 m ,lightning protection ,conductors ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,international electromagnetic standards ,business - Abstract
Based on completely mastering ±800 kV transmission technologies, the first ±1100 kV direct current (DC) transmission demonstration project is being constructed in China. Combining theoretical analysis and a large number of experiments, the margin of switching overvoltage in converter stations, the configuration scheme and performance of lightning arresters, the shielding angles of ground lines under different geographical conditions, and the maximum air gap of lines have been determined. The switching impulse flashover characteristics of equipotential sphere and typical rod-plane air gaps are also provided. The external insulation is designed differently for light, medium, and heavy pollution areas. For the ±1100 kV project, if the 8 × 1250 mm^2 conductors are applied, the pole gap is 26 m and the height of the line is 25 m, all the electromagnetic parameters will meet the requirement of international electromagnetic standards. The key design points of ±1100 kV converter transformers, smoothing reactors, converter valves, and wall bushings are researched and the 75 mH smoothing reactors, ±1100 kV/5000 A converter valves, and ±1100 kV/5523 A wall bushings are successfully made. The optimised hierarchical connection modes and coordination control measure of the ±1100 kV project are studied and the results can provide sufficient technical support for the demonstration project.
- Published
- 2018