中频变压器瞬态电磁场温度场耦合求解分析  

Coupled Transient Electromagnetic-thermal Fields Analysis of Medium-frequency Transformer

作　　者：陈彬[1,2] 梁旭[1] 万妮娜 唐波 黄力[1,2] CHEN Bin;LIANG Xu;WAN Nina;TANG Bo;HUANG Li(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line,China Three Gorges University,Yichang 443002,China;Yichang Electric Company,State Grid Hubei Electric Power Company,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,宜昌443002 [2]湖北省输电线路工程技术研究中心(三峡大学),宜昌443002 [3]国网湖北省电力有限公司宜昌供电公司,宜昌443002

出　　处：《高电压技术》2020年第12期4400-4409,共10页High Voltage Engineering

基　　金：湖北省输电线路工程技术研究中心开放课题(2019KXL08)。

摘　　要：基于中频变压器的磁耦合DC-DC变换器是实现大规模直流源互联、兆瓦级直流电压变换的核心设备。但是高功率密度、高频率会导致中频变压器的温升问题严重。针对非正弦激励下中频变压器的温度场精确计算问题,计及温度对纳米晶合金材料磁化和损耗特性的影响,采用瞬态电磁场–温度场间接耦合计算方法,对一台200kVA/10 kHz的纳米晶铁芯中频变压器在空载和短路条件下的铁芯损耗、绕组损耗、温度场进行计算。将仿真值与实验测量值进行对比。结果表明:采用间接耦合计算方法得到的铁芯损耗、绕组损耗、最高温升与测量值之间的相对误差分别为8.08%、0.63%、8.19%。最后采用上述方法计算了中频变压器在移相控制运行模态下的损耗和温升,为高功率密度中频变压器的结构设计和散热设计提供依据。Magnetically coupled DC-DC converter based on medium-frequency transformer(MFT) is the key equipment for realizing large-scale DC source interconnection and MW-level DC voltage conversion. However, the high power density and high frequency will increase the temperature rise of MFT. In order to obtain the temperature field of MFT under non-sinusoidal excitation accurately, the effects of temperature on magnetization and loss properties of nanocrystalline alloys are taken into consideration, and the coupled transient electromagnetic-thermal fields method is used to simulate the core loss, winding loss, temperature field of a 200 kVA/10 kHz nanocrystalline core MFT under no-load and short-circuit conditions. The simulated values are compared with the measured values, and the results show that the relative deviations of core loss, winding loss, maximum temperature rise are 8.08%, 0.63%, and 8.19%, respectively. Finally, the loss and temperature rise of the MFT under the phase shift control mode are calculated, which is essential for the structure and heat dissipation design of the high power density MFT.

关 键 词：中频变压器 铁芯损耗 绕组损耗 温度场 移相控制 

分 类 号：TM432[电气工程—电器]