Calculation and Verification of Thermal Time Constants of DC-link Capacitor

ZHANG Maoshan; ZUO Qianglin; NI Yan; LU Minglin

doi:10.14044/j.1674-1757.pcrpc.2026.01.009

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Calculation and Verification of Thermal Time Constants of DC-link Capacitor

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Capacitor

Calculation and Verification of Thermal Time Constants of DC-link Capacitor
直流支撑电容器的热时间常数计算与验证
Jiashan Sunking Power Electronic Capacitor Co., Ltd., Zehjiang Jiashan 314112, China
Wuxi Sunking Power Capacitor Co., Ltd., Jiangsu Wuxi 214177, China
Vol. 47, Issue 1, Pages: 66-71(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.01.009
稿件说明：

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ZHANG Maoshan, ZUO Qianglin, NI Yan, et al. Calculation and Verification of Thermal Time Constants of DC-link Capacitor[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(1): 66-71.
DOI：

ZHANG Maoshan, ZUO Qianglin, NI Yan, et al. Calculation and Verification of Thermal Time Constants of DC-link Capacitor[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(1): 66-71. DOI： 10.14044/j.1674-1757.pcrpc.2026.01.009.

摘要

本文从热时间常数的定义和热电对偶原理着手，推导得到了直流支撑电容器的耗散热阻和内部的传动热阻的计算公式，从而得到了直流支撑电容器的热时间常数的计算方法。通过直流支撑电容器的温升试验，确定了电容器的散热系数和热时间常数的计算值。根据热电对偶原理，设计了热时间常数的试验验证方法，提出通过测量电容器外壳温升来确定心子温升的方法；采用降温的方式，得到了直流支撑电容器的热时间常数测试值，验证了测试方法和计算方法的正确性，这对于广大工程技术人员理解电容器的热时间常数很有意义。

Abstract

This paper，starting from the definition of thermal time constant（TTC）and the principle of thermoelectric duality，deduces the calculation formula of heat disspiation resistance and internal transmission heat resistance of DC-link capacitor，thus obtaining the calculation method of TTC of DC-link capacitor. The calculated values of heat dissipation coefficient and TTC are determined through the temperature rise test of DC-link capacitor. According to the thermoelectric duality principle，the test verification method of the TTC is designed，and the method to determine the temperature rise of core by measuring the temperature rise of the capacitor case is proposed. The test value of theTTC of DC-link capacitor is obtained by cooling method，which verifies the correctness of the test and calculation methods， and is of great significance for the majority of engineers to understand the TTC of capacitor.

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references

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