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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (6): 1159-1167    DOI: 10.3785/j.issn.1008-973X.2021.06.017
    
Simplification method and application of thermal model of forced air cooling system for power electronic device
Hong-yi LIN(),Xiao GUO,Liang WU,Guo-zhu CHEN*()
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  

The accurate thermal model of the typical forced air cooling system was proposed based on the theory of heat conduction, fluid heat transfer and fluid mechanics in order to improve the design efficiency of thermal design. A simplified thermal model was proposed based on the accurate thermal model. The forced air cooling system can be quickly and accurately designed by the simplified thermal model. The simplified thermal model with the advantages of small calculation amount and high design efficiency was applied to the thermal design of 380 V/50 kVar SiC-MOSFET static var generator (SVG). The surface temperature rise error of the SVG heatsink designed by the simplified model was 4.1 ℃ (full load condition), which meeted the requirements of engineering design.

Key words： thermal design      simplified thermal model      forced air cooling      static var generator (SVG)     
Received: 13 July 2020      Published: 30 July 2021
CLC:  TM 762  
  O 551  
Fund:  国家自然科学基金资助项目（51777186）
Corresponding Authors: Guo-zhu CHEN     E-mail: lhy2007.11@qq.com;gzchen@zju.edu.cn
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Hong-yi LIN
Xiao GUO
Liang WU
Guo-zhu CHEN
Cite this article:

Hong-yi LIN,Xiao GUO,Liang WU,Guo-zhu CHEN. Simplification method and application of thermal model of forced air cooling system for power electronic device. Journal of ZheJiang University (Engineering Science), 2021, 55(6): 1159-1167.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.06.017     OR     https://www.zjujournals.com/eng/Y2021/V55/I6/1159


电力电子装置强风散热模型简化方法及应用

为了提高热设计的设计效率，基于热传导、流体换热、流体力学理论，对典型强迫风冷散热系统进行精确建模，对精确模型进行简化方法的研究. 使用该简化热模型，可以对强迫风冷散热系统进行快速、准确的设计. 采用该简化热模型设计的380 V/50 kVar SiC-MOSFET静止无功补偿器（SVG）的工业化样机，散热器表面温升误差为4.1 ℃（满载条件），满足工程化设计的要求.


关键词： 散热器设计,  简化热模型,  强迫风冷,  静止无功补偿器（SVG） 
Fig.1 Typical structural of forced air cooling system and its Foster thermal resistance network
Fig.2 Process of thermal resistance solution
Fig.3 Thermal resistance model of heat sink duct unit
Fig.4 Relationship of fin length of heat sink c and thermal resistance Rth,h-a
Fig.5 Relationship of fin spacing factor si and length L and thermal resistance Rth, h-a
Fig.6 Structure of SVG system
符号 参数说明 参数值
Us 电网线电压 380 V
f0 电网频率 50 Hz
Vdc SVG直流侧电压 780 V
Sc SVG额定功率 50 kVar
Ixrms 每只MOSFET输出电流有效值 25 A
fsw 开关频率 50 kHz
Esw,const 开关损耗系数（tc=100 ℃） 17×10?6 J
Esw,k 开关损耗系数（tc=100 ℃） 140×10?6 J
Qrr 二极管反向充电电荷（tc=100 ℃） 230 nC
Ron 导通电阻（tc=100 ℃） 60 mΩ
Tab.1 Circuit parameters of SVG
Fig.7 Steady-state simulated temperature field of cooling system (ta = 25 ℃)
参数 仿真值 实验值
Q/W 768 787
Δtc/℃ 38.2 43.1
Δth/℃ 21.1 21.9
Rth,h-a/(K·W?1) 0.027 5 0.027 8
${\sigma _{{R_{{\rm{th}}}}}} $（精确热模型） 20.7% 19.4%
Δth,err/℃ 4.9 4.7
${\sigma _{{R_{{\rm{th}}}}}} $（简化热模型） 18.8% 17.2%
Δth,err/℃ 4.4 4.1
Tab.2 Simulation and test results of cooling system with SVG full load
Fig.8 Test platform of cooling system
Fig.9 Output current of SVG with full load
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