Open AccessResearch on Influence of Converter Transformer Grouping and Receiving End Power Grid Structure on Converter Transformer DC bias
Author(s) -
Chenglian Ma,
Li Sun,
Shujian Zhao,
Lianguang Liu
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1304/1/012002
Subject(s) - forward converter , flyback converter , transformer , dc bias , distribution transformer , electrical engineering , grid , electronic engineering , engineering , boost converter , computer science , voltage , mathematics , geometry
When ±800kV UHVDC project was put into operation, DC bias problem can not be ignored. In this paper, a calculation model for DC bias current is established based on Xiluodu-Zhexi UHVDC project data. Converter transformer grouping and receiving end power grid structure are considered. The converter transformer DC bias current is calculated by node voltage method. The influence of different converter transformer grouping modes, distance between grounding electrode and substation, and the feeder length and the number of feeder loop are analysed. The results show that, single-phase converter transformer bias current is maximum with full load and 6 converter transformers under 1/2 monopole earth mode. And bias current level of converter can be reduced in planning and designing.