变流器风冷系统热建模方法  

Thermal modeling for the air-cooling system of power converters

作　　者：梁原 贾昊 付和平 陈杰[1] LIANG Yuan;JIA Hao;FU Heping;CHEN Jie(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Institute of Automatic Control Equipment,Beijing 100074,China)

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]北京自动化控制设备研究所,北京100074

出　　处：《北京交通大学学报》2024年第5期171-178,共8页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：中央高校基本科研业务费专项资金(2023JBZY041);国家自然科学基金(U1134204)。

摘　　要：为提高变流器的运行可靠性,掌握变流器风冷系统的散热状态,提出一种对于风冷散热器的热建模方法.首先,基于流体动力学理论和传热学理论建立考虑空气温度因素与散热器进风口堵塞的风冷散热器三维集总参数热模型;其次,通过仿真计算功率模块的损耗,利用计算流体动力学(Computational Fluid Dynamics,CFD)仿真软件模拟不同堵塞程度下的散热器温度,完成不同堵塞程度下的三维热网络模型的仿真验证;最后,搭建实验平台,将实测散热器温度与二维及三维热网络模型计算得出的散热器温度进行比较.研究结果表明:建立的风冷散热器三维热网络模型平均精度计算误差为1.8%,相较于传统的二维热模型平均精度计算误差降低5.1%,能够为冷却系统的散热状态评估提供参考.To enhance the operational reliability of power converters and accurately assess the thermal dissipation state of air-cooling systems,this study proposes a novel thermal modeling method for air-cooled heat sinks.First,a three-dimensional lumped-parameter thermal model for air-cooled heat sinks is developed based on fluid dynamics and heat transfer theories,taking into account the effects of air temperature variations and inlet blockage.Second,the power module losses are calculated through simulation,and Computational Fluid Dynamics(CFD)software is employed to simulate the heat sink temperatures under various blockage levels,thereby validating the three-dimensional thermal network model.Finally,an experimental platform is established to compare the measured heat sink tempera-tures with those obtained from the two-dimensional and three-dimensional thermal network models.The results indicate that the proposed three-dimensional thermal network model achieves an average calculation error of 1.8%,which is 5.1%lower than that of the traditional two-dimensional model.This approach provides a robust reference for evaluating the thermal state of cooling systems.

关 键 词：变流器 风冷系统 散热状态 热建模 

分 类 号：TM46[电气工程—电器] TK172[动力工程及工程热物理—热能工程]