Thermal modeling and transient behavior analysis of a medium-frequency high-power transformer
Thermal modeling and transient behavior analysis of a medium-frequency high-power transformer
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中频大功率变压器的热建模和瞬态行为分析
DOI：
10.1109/iecon.2017.8216372
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Philip Came Kjar
中科院分区：
文献类型：
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作者：
Annoy Kumar Das;Zhongbao Wei;Sriram Vaisambhayana;S. Cao;Haonan Tian;Anshuman Tripathi;Philip Came Kjar
使用功率电子（PE）转换器结合中/高频Transformer的中/高功率转换系统具有适合于现代电力系统架构的许多期望效果。在高频下的切换导致较小的磁性体体积，但引起较高的损耗密度。因此，中频（MF）大功率（HP）Transformer的设计和表征对其性能和应用具有重要的影响。中高压Transformer的热管理是其性能的关键之一。本文推导了多层集中绕组的等效热模型。铁芯和铜损耗都经过仔细估算。精确计算热阻和电容。提出的热网络的时域响应得到使用Heun的方法（修改的欧拉）和验证PLECS。讨论了温度变化对材料和冷却剂（Transformer油）热性能的影响。此外，通过对10 kW、0.5/2.5 kV、1 kHz自然油冷Transformer的FEM-CFD研究证实了所述热网络的准确性。分析和模拟结果之间的密切协议观察，证实所提出的热模型的计算精度和效率。
A medium/high-power conversion system, using power electronic (PE) converter in conjunction with a medium/high-frequency transformer, has many desirable effects suitably oriented for modern power system architecture. Switching at high frequency results in lesser volume of magnetics but induces higher loss density. Thus design and characterization of a medium-frequency (MF) high-power (HP) transformer has significant ramification on its performance and application. Thermal management of a MF HP transformer is one of key aspects for its characterization. In this paper, an equivalent thermal model of a multi-layer concentrated winding is derived. Core and copper losses are carefully estimated. Thermal resistance and capacitance are accurately calculated. Time-domain response of proposed thermal network is obtained using Heun's method (Modified Euler) and validated with PLECS. Effects of temperature change on thermal properties of material and coolant (transformer oil) are also discussed. Furthermore, accuracy of said thermal network is corroborated through FEM-CFD study of a 10kW, 0.5/2.5kV, 1kHz natural oil-cooled transformer. Close agreement between analytical and simulation results is observed which substantiates proposed thermal model in terms of accuracy and efficacy of computation.