Volume 37, Number 3, June 2019
|Page(s)||594 - 600|
|Published online||20 September 2019|
A Design of Online Fault Diagnosis System Based on ESR for Electrolytic Capacitors
School of Automation, Central South University, Changsha 410075, China
2 School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China
3 Unique Railway Transport Technology Co., Ltd, Changchun 130000, China
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.
Key words: electrolytic capacitor / equivalent series resistance(ESR) / online / fault diagnosis
关键字 : 电解电容器 / 等效串联电阻(ESR) / 在线 / 故障诊断
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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