电网技术2016，Vol.40Issue(1)：322-327,6.DOI:10.13335/j.1000-3673.pst.2016.01.045
换流变压器编组和受端电网结构对其直流偏磁的影响研究
Research of Converter Transformer Marshalling and Receiving-End Grid Structure's Effect on Converter Transformer DC Bias
摘要
Abstract
During the operation of Xiluodu-Zhexi ±800 kV HVDC transmission project,a serious DC bias problem arose for converter transformers of Jinhua converter station.Based on Xiluodu-Zhexi UHVDC receiving-end grid structure and four groups of converter transformers of Jinhua converter station,we establish a calculation model for DC bias current,taking into consideration factors such as the converter transformer marshalling operation mode and the receiving-end grid structure.Using comparative analysis and node voltage method,the converter transformer DC bias current is calculated,the influence of different converter transformer marshalling and receiving-end grid structure on converter transformer DC bias is analyzed.The research results show that,the most severe DC bias occurs in converter transformers when the converter is operating at 1/2 unipolar ground at its full capacity,and the main factors affecting DC bias severity are the length of the 500 kV bus feeder,its loops number and its connected station's distance to the grounding electrode.In the planning and design of receiving-end grid composition and structure,the measure to reduce the direct current of converter transformers should be considered.关键词
换流变编组/受端电网结构/直流偏磁电流Key words
converter transformer marshalling/receiving-end grid structure/DC bias current分类
信息技术与安全科学引用本文复制引用
刘连光,闫旭东,马成廉,魏恺,张燕秉..换流变压器编组和受端电网结构对其直流偏磁的影响研究[J].电网技术,2016,40(1):322-327,6.基金项目
国家自然科学基金项目(515770607).Project Supported by National Natural Science Foundation of China(NSFC)(515770607). （515770607）
