LIN Jiajun,GAO Hao,PAN Ming,et al.Loss analysis and thermal structure design of large-capacity medium-frequency transformers with ultra-thin grain-oriented silicon steel cores[J].ZHEJIANG ELECTRIC POWER,2026,45(04):123-132.
LIN Jiajun,GAO Hao,PAN Ming,et al.Loss analysis and thermal structure design of large-capacity medium-frequency transformers with ultra-thin grain-oriented silicon steel cores[J].ZHEJIANG ELECTRIC POWER,2026,45(04):123-132.DOI: 10.19585/j.zjdl.202604012.
Loss analysis and thermal structure design of large-capacity medium-frequency transformers with ultra-thin grain-oriented silicon steel cores
Ultra-thin grain-oriented silicon steel features low medium-frequency loss and high magnetic induction, giving it strong application potential in large-capacity medium-frequency transformers. However, influenced by operating voltage waveforms and frequencies, existing large-capacity medium-frequency transformers still experience high losses and severe heating. To improve the accuracy of loss analysis and reduce temperature rise, this paper investigates a 1,800 kVA medium-frequency transformer and analyzes the loss-calculation methods for both the core and the windings. The accuracy of the core-loss calculation is verified using theoretical formulas in combination with three-dimensional finite element analysis. Two-dimensional finite element analysis is employed to determine the ratio of AC to DC resistance of the windings, from which the AC winding losses are obtained. Using the calculated losses as heat sources, a finite element thermal model of the medium-frequency transformer is established. The effects of cooling-water flow rate, thermal conductivity of cooling pipes, and thermal conductivity of epoxy resin on the temperature rise of the windings and the core are then analyzed. The results provide valuable guidance for the thermal structure design of medium-frequency transformers employing ultra-thin grain-oriented silicon steel cores.
关键词
Keywords
references
TANG B , YANG J W , HUANG L , et al . Determination of permissible distance between air defense surveillance radar and UHVAC power transmission lines [J]. IEEE Transactions on Applied Superconductivity , 2019 , 29 ( 2 ): 0500105 .
TANG Guangfu , WANG Gaoyong , HE Zhiyuan , et al . Research on key technology and equipment for Zhangbei 500 kV DC grid [J]. High Voltage Engineering , 2018 , 44 ( 7 ): 2097 - 2106 .
YUAN F T , TANG B , DING C , et al . Optimization design of a high-coupling split reactor in a parallel-type circuit breaker [J]. IEEE Access , 2019 , 7 : 33473 - 33480 .
XIAO Maoran , GUO Ning , QIANG Yuyi , et al . Construction of distribution network edge agent system based on domain driven design [J]. Power Demand Side Management , 2024 , 26 ( 6 ): 81 - 87 .
LIU Yunpeng , XU Ziqiang , LI Gang , et al . Review on applications of artificial intelligence driven data analysis technology in condition based maintenance of power transformers [J]. High Voltage Engineering , 2019 , 45 ( 2 ): 337 - 348 .
LIU Jiewei , LÜ Yunqiang , LI Lin , et al . Transient simulation analysis of electromagnetic field and temperature field of high-frequency transformer [J]. High Voltage Engineering , 2019 , 45 ( 4 ): 1191 - 1200 .
CHEN Bin , LI Lin , LIU Haijun , et al . Calculation and analysis of leakage inductance and winding loss of high-frequency transformer based on finite element method [J]. Advanced Technology of Electrical Engineering and Energy , 2018 , 37 ( 1 ): 8 - 14 .
VILLAR I , MIR L , ETXEBERRIA-OTADUI I , et al . Optimal design and experimental validation of a Medium-Frequency 400 kVA power transformer for railway traction applications [C]// Proceedings of 2012 IEEE Energy Conversion Congress and Exposition (ECCE) . Raleigh : IEEE , 2012 : 684 - 690 .
XU Zhiwei , XU Zhimeng , LIU Zhihua . Study on influence mechanism of leakage reactance of high frequency transformer [J]. Journal of Hunan Institute of Engineering (Natural Science Edition) , 2020 , 30 ( 1 ): 6 - 10 .
SHAO Xianjun , GAO Yiran , JIN Lingfeng , et al . Thermal-fluid field coupling simulation and characteristic analysis on internal temperature of oil-immersed transformers [J]. Zhejiang Electric Power , 2023 , 42 ( 12 ): 36 - 44 .
WANG Xiaoqin , ZHANG Shengwei , FANG Nan . High frequency transformer design in the low voltage high current switching power supply [J]. Telecom Power Technology , 2018 , 35 ( 3 ): 138 - 139 .
ALBACH M , DURBAUM T , BROCKMEYER A . Calculating core losses in transformers for arbitrary magnetizing currents a comparison of different approaches [C]// PESC Record. 27th Annual IEEE Power Electronics Specialists Conference . Baveno,Italy : IEEE , 2002 : 1463 - 1468 .
VENKATACHALAM K , SULLIVAN C R , ABDALLAH T , et al . Accurate prediction of ferrite core loss with nonsinusoidal wave forms using only Steinmetz parameters [C]// Proceedings of 2002 IEEE Workshop on Computers in Power Electronics . Mayaguez : IEEE , 2002 : 36 - 41 .
REINERT J , BROCKMEYER A , DE DONCKER R W . Calculation of losses in Ferro-and ferrimagnetic materials based on the modified Steinmetz equation [J]. IEEE Transactions on Industry Applications , 2001 , 37 ( 4 ): 1055 - 1061 .
CAO Xiaopeng , CHEN Wu , NING Guangfu , et al . Optimization design of high-power high-frequency transformer based on multi-objective genetic algorithm [J]. Proceedings of the CSEE , 2018 , 38 ( 5 ): 1348 - 1355 .
WANG Weiwang , LIU Ying , HE Jiefeng , et al . Research status and development of high frequency transformer used in high voltage and large capacity power electronic transformer [J]. High Voltage Engineering , 2020 , 46 ( 10 ): 3362 - 3373 .
XIE Zengqi , HAN Yaoxuan , LI Zhihui , et al . High frequency surface discharge characteristics of aluminum nitride/epoxy resin composites with high thermal conductivity [J]. Proceedings of the CSEE , 2024 , 44 ( 13 ): 5374 - 5385 .