A Design of Online Fault Diagnosis System Based on ESR for Electrolytic Capacitors

被引：0

作者：

An Z. ^{[1
]}

Zhang G. ^{[1
]}

Li K. ^{[2
]}

Wu X. ^{[1
]}

Cheng S. ^{[2
]}

Qiao H. ^{[3
]}

机构：

[1] School of Automation, Central South University, Changsha

[2] School of Traffic & Transportation Engineering, Central South University, Changsha

[3] Unique Railway Transport Technology Co., Ltd, Changchun

来源：

Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University | 2019年 / 37卷 / 03期

关键词：

Electrolytic capacitor; Equivalent series resistance(ESR); Fault diagnosis; Online;

D O I：

10.1051/jnwpu/20193730594

中图分类号：

学科分类号：

摘要：

ESR(Equivalent Series Resistance) is one of the important indicators for evaluating health status of electrolytic capacitors. Due to the structural specificity of the electrolytic capacitors, ESR is difficult to measure directly. In order to monitor the health status of the electrolytic capacitor in real time, an equivalent model for the electrolytic capacitor is established. The ESR frequency characteristics and temperature characteristics are analyzed and tested. The method of online fault diagnosis by evaluating the health status of the electrolytic capacitor with online calculation of ESR is proposed. Comparing the calculated value of ESR real-time with the initial value, when the former increases to a certain threshold value with respect to the latter under the same working condition, the electrolytic capacitor can be considered as failed, and the observer can perform replacement processing according to this mechanism in time. Finally, the effectiveness of the method was verified by using the dSPACE semi-physical experimental platform. © 2019 Journal of Northwestern Polytechnical University.

引用

页码：594 / 600

页数：6

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