Evaluation of functional reliability indices for DC-link capacitors in pulse-width modulation converters

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...

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Bibliographic Details
Main Author: Gorpinich, Alexander
Format: Conference Proceeding
Language:English
Subjects:
Ambient temperature
Capacitors
Case studies
Electrolytic capacitors
Frequency converters
Insulation
Mean time to failure
Modules
Motors
Normal distribution
Pulse duration modulation
Reliability analysis
Rolling mills
Statistical analysis
Thermal stress
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Summary: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.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/201711301004