摘要
换流变压器故障率显著高于普通电力变压器,电磁、流-热多物理场耦合下绝缘老化是影响其安全可靠运行的首要原因。聚焦于换流变压器电磁场与温度场,研究了面向换流变压器复杂结构的电磁、流-热多物理场耦合机制,对当前换流变压器在交直流复合电压与极性反转电压下的电场数值计算,计及离子迁移模型的电场数值计算,考虑非正弦电流的磁场及损耗数值计算,考虑流-热耦合和电磁-流-热耦合的温度场数值计算等方法进行归纳总结,展望了多物理场耦合的研究趋势,指出空间和界面电荷对于换流变压器油纸绝缘体系电场分布的影响,温度场对绝缘材料性能参数的影响,温度场与流场更全面的耦合与损耗计算是未来研究的重点方向。这些研究成果的总结可为实现各物理场分布的精确量化,进而对换流变压器的前期设计优化和后期高效运维提供参考和借鉴。
The failure rate of converter transformer is significantly higher than that of ordinary power transformers.Insulation aging under coupling of electromagnetic,thermal and fluid multi-physical fields is the primary reason for threatening their safe and reliable operation.Based on the electromagnetic field and temperature field of converter transformer,the coupling mechanism for complex structure of converter transformer is studied.The numerical calculation methods of electric field under AC/DC composite voltage and polarity reversal voltage,electric field counting ion migration model,magnetic field and loss considering non-sinusoidal current,and temperature field considering fluid-thermal coupling and electromagnetic-fluid-thermal coupling of converter transformer are summarized.The research trend of multi-physical field coupling is prospected.It is pointed out that the key direction of future research will focus on the influences of space and interface charges on the electric field distribution in oil-pressboard insulation systems of converter transformers,the influence of temperature field on the performance parameters of insulating materials,the influence of heat dissipation mode on temperature field,and the more comprehensive coupling and loss calculation of temperature field and fluid field.The summary of these research results can be used to realize the accurate quantification of the distribution of each physical field,which in turn provides reference for the previous design optimization and later efficient operation and maintenance of the converter transformer.
作者
李清泉
朱然
李姝奇
任富强
康朝阳
刘洪顺
李泽
孙优良
LI Qingquan;ZHU Ran;LI Shuqi;REN Fuqiang;KANG Zhaoyang;LIU Hongshun;LI Ze;SUN Youliang(Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment,Shandong University,Jinan 250061,China;Shandong Electrical Engineering and Equipment Group Co.,Ltd.,Jinan 250022,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第10期4734-4748,共15页
High Voltage Engineering
基金
国家自然科学基金(52307180)
山东省重点研发计划(2021CXGC010211)
泰山产业创新人才项目(tscx202306012)。
关键词
换流变压器
多物理场耦合
绝缘
交直流复合
极性反转
converter transformer
multi-physics coupling
insulation
AC
DC composite
polarity reversal
