000K  utf8
1100  $c2018
1500  eng
2050  urn:nbn:de:gbv:8-publ-16113
2051  10.1109/TPEL.2017.2704293
3000  Ko, Youngjong
3010  Buticchi, Giampaolo
3010  Jedtberg, Holger
3010  Liserre, Marco
4000  Analysis of DC-Link Current Influence on Temperature Variation of Capacitor in a Wind Turbine Application  [Ko, Youngjong]
4209  Back-to-back converters for wind turbine systems feature capacitors in the dc-link to maintain a stable voltage and to decouple a generator from the electric grid. The electrolytic capacitors are typically chosen for their advantages; a higher energy density and a higher capacitance at lower costs. Long-term field experiences and recorded failure data revealed that the capacitors are one of the most frequent failure reasons for the wind turbine system. The current profile of the capacitors is highly responsible for this degradation, since it determines the dissipated power of the capacitor. This paper analyzes the actual current profile in the dc-link capacitor of a back-to-back converter for wind turbine application. A power converter is also designed to generate sinusoidal current at arbitrary frequency and arbitrary dc bias voltage for testing purposes. The experimental results confirm that the proposed power converter enables us to derive the correlation between the current frequency and the temperature variation of capacitor.
4950  https://doi.org/10.1109/TPEL.2017.2704293$xR$3Volltext$534
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8-publ-16113$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/publ_mods_00001611
5051  621.3
5550  Back-to-back converter
5550  electrolytic capacitor
5550  reliability
5550  ripple current stress
5550  wind turbine