金属化膜电容器电热仿真分析*

doi:10.11985/2023.03.024

摘要/Abstract

摘要：

金属化薄膜电容器(Metallized film capacitor, MFC)是高压大容量电力电子系统领域广泛使用的储能器件，具有储能密度高和可靠性好等特点。在工作状态下，反复的充放电过程会使得电容器内部温度升高，过高的内部温度会导致电容器可靠性降低从而影响系统可靠性。对金属化膜电容器建立三维电场模型，获取其功率损耗；利用有限元软件，求解金属化膜电容器热模型，模拟实际工况下电容器的温升情况；最后搭建金属化膜电容器充放电试验平台，进行温度分布试验分析，验证了所建有限元模型的准确性。结果表明，建立的金属化膜电容器电热模型能够准确描述正常工况下的温升情况。所做工作将对电容器的寿命预测以及电力电子系统的可靠性分析提供参考。

关键词: 金属化薄膜电容器, 有限元仿真, 电热特性, 可靠性评估

Abstract:

Metallized film capacitor(MFC) with high energy density and good reliability is widely used in the field of high voltage and large capacity power electronic system. In the working state, repeated charging and discharging process will make the internal temperature of the capacitor rise, too high internal temperature will lead to the reliability of the capacitor and affect the system reliability. A three-dimensional electric field model of metallized film capacitor is established to obtain its power loss. The thermal model of metallized film capacitor is solved by using finite element software, and the temperature rise of the capacitor is simulated under the actual working condition. Finally, the charging and discharging experiment platform of metalized film capacitor is built, and the temperature distribution experiment is conducted to verify the accuracy of the established finite element model. The results show that the electrothermal model of metallized film capacitor can accurately describe the temperature rise under normal working conditions. The work will provide reference for capacitor life prediction and reliability analysis of power electronic system.

Key words: Metallized film capacitors, finite element simulation, electrothermal characteristics, reliability assessment

中图分类号:

TM533

葛雪峰, 姜佳宝, 赵耀. 金属化膜电容器电热仿真分析^*[J]. 电气工程学报, 2023, 18(3): 224-231.

GE Xuefeng, JIANG Jiabao, ZHAO Yao. Electrothermal Simulation Analysis of Metallized Film Capacitor[J]. Journal of Electrical Engineering, 2023, 18(3): 224-231.

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类别	数值
电压/V	50
内阻/Ω	0.015 9
电容值/μF	220

内部域	材料名称	电阻率/(Ω/m)
电极	锌	5.196×10^-4
芯棒	聚碳酸酯	4 ×10¹⁴
填充物	聚氨酯	2.1×10⁶
外壳	不锈钢	7.3×10^-7

内部域	材料名称	导热系数/ [W/(m·K)]	比热容/ [J/(kg·K)]
电极	锌铝合金	123^[17]	389^[17]
绝缘物	聚丙烯	0.20	1 767
芯棒	聚碳酸酯	0.19	1 172
填充物	聚氨酯	0.52	1 716
外壳	不锈钢	15.76	499.3