南方电网技术2018，Vol.12Issue(10)：1-6,6.DOI:10.13648/j.cnki.issn1674-0629.2018.10.001
YY型和YD型换流变压器中性点电流差异化产生机理及抑制方法
Mechanism and Suppressing Method of Neutral Current Difference Between YY and YD Converter Transformers
雷园园 1李盼盼 2许加柱 2黎泉 2赵林杰 1宋作森3
作者信息
- 1. 南方电网科学研究院,广州 510663
- 2. 湖南大学电气与信息工程学院,长沙 410082
- 3. 中国南方电网超高压输电公司检修试验中心,广州 510663
- 折叠
摘要
Abstract
When HVDC transmission system operates in mono-polar condition or is struck by lightning current in the converter station, it will lead to unbalanced distribution of neutral current between YY and YD converter transformers. If the current difference is too large, it will cause damage to converter transformer and even HVDC block. In viewof this technical problem, this paper reveals the mechanism of neutral point current difference in converter transformer based on transformer magnetic potential balance theory, and proposes a newmethod to restrain the neutral point current difference based on the construction of YY + d converter transformer with the third winding which connects to triangle. The PSCAD model based on the converter transformer parameters of actual project is built up for verification simulation. This paper provides a technical basis for the solution scheme for engineering problems caused by the current difference of converter neutral point, and has a reference and guiding significance for the design, operation, maintenance and protection configuration of converter transformers in practical DC projects.关键词
高压直流输电/换流变压器/中性点电流/差异化/磁动势平衡Key words
HVDC/converter transformer/neutral point current/differentiation/magnetic potential balance分类
信息技术与安全科学引用本文复制引用
雷园园,李盼盼,许加柱,黎泉,赵林杰,宋作森..YY型和YD型换流变压器中性点电流差异化产生机理及抑制方法[J].南方电网技术,2018,12(10):1-6,6.
