基于多台不同变压器的直流偏磁抑制措施研究  

Study on DC Bias Suppression Measures Based on Multiple Different Transformers

作　　者：王渝红[1] 欧林[2] 张超[1] 李兴源[1] 张功望 杨东斌 WANG Yuhong OU Lin ZHANG Chao LI Xingyuan ZHANG Gongwang YANG Dongbin(School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China State Grid Chongqing Electric Power Co., Electric Power Research Institute, Chongqing 401123, China State Grid Shaanxi Electric Power Corporation Maintenance Company, Xi＇an 710065, China)

机构地区：[1]四川大学电气信息学院,成都610065 [2]国网重庆市电力公司电力科学研究院,重庆401123 [3]国网陕西省电力公司检修公司,西安710065

出　　处：《高压电器》2017年第8期159-165,172,共8页High Voltage Apparatus

基　　金：国家重点基础研究发展计划项目(2013CB228204)~~

摘　　要：笔者以变电站与换流站合并建站作为站内有多台不同变压器的典型情况。在存在偏磁电流的情况下,详细计算了偏磁电流在各台变压器中性点分布情况,计算得到主变中性点偏磁电流约为换流变中性点偏磁电流的2倍。提出仅对交流主变采用相应的抑制措施来抑制整个变电站的直流偏磁。最后,文中以某实际直流工程为基础,搭建了详细的电磁暂态模型,通过仿真计算得到:仅对偏磁电流较大的主变采用抑制措施时,能有效的抑制整个站偏磁现象。综合考虑多种影响因素,选择仅在主变中性点采用串电容的方法来抑制直流偏磁。In this paper,a substation which contains AC transformers and converter transformers is treated as typical example that a substation contains multiple different transformers. In the case of the presence of the bias current, DC bias current in every transformer neutral point distribution is calculated in detail,in which the DC bias current in AC transformers＇ neutral point is about 2 times of the DC bias current in converter transformers＇ neutral point. The main DC bias suppression measures are briefly introduced, the corresponding suppression measures are applied only to AC transformers which is used to suppress the DC bias in the entire substation. Finally,this paper takes a practi- cal DC project as basis to build in a detailed electromagnetic transient model. The following results can be obtained through simulation： the corresponding suppression measures are only applied to AC transformers can effectively in- hibit the DC bias in the entire substation. Considering the variety of factors, the method of connecting series capaci- tor in the AC transformers＇ neutral point is chosen to suppress the DC bias in the entire substation.

关 键 词：直流偏磁 偏磁电流 抑制措施 变压器中性点 电磁暂态 

分 类 号：TM41[电气工程—电器]