| Issue |
MATEC Web Conf.
Volume 113, 2017
12th International Scientific-Technical Conference on Electromechanics and Robotics “Zavalishin’s Readings” - 2017
|
|
|---|---|---|
| Article Number | 01004 | |
| Number of page(s) | 6 | |
| Section | Electromechanics and Electric Power Engineering | |
| DOI | https://doi.org/10.1051/matecconf/201711301004 | |
| Published online | 20 June 2017 | |
Evaluation of functional reliability indices for DC-link capacitors in pulse-width modulation converters
Pryazovskyi State Technical University, Department of Electrical Engineering, 87500 Mariupol, Ukraine
* Corresponding author: gorpinich@ieee.org
The impact of kHz range harmonics on the power losses, thermal stress, and lifetime reduction of the dc-link capacitors in pulse-width modulation (PWM) converters was investigated. Expressions to evaluate the mean time to failure, survival probability, and unavailability of aging failure for dc-link capacitors are presented. The dc-link capacitors failures due to accelerated insulation aging were modeled using Weibull and normal distribution. A case study with the Siemens SINAMICS S120 frequency converter for driving of rolling mill leveler shows that the failures of motor modules due to breakdown of electrolytic dc-link capacitors registered for the time frame from May 2012 to October 2012 can be caused by the increased ambient temperature and additional heating due to high-frequency components of the ripple current. As a possible solution to improve reliability of motor modules, the four AVX FFVE4I0227K film capacitors instead of nine EPCOS B43564 electrolytic capacitors in dc-link were recommended.
© The Authors, published by EDP Sciences, 2017
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