TY - GEN
T1 - Impacts of unbalanced grid voltages on lifetime of DC-link capacitors of back-to-back converters in wind turbines with doubly-fed induction generators
AU - Jedtberg, Holger
AU - Langwasser, Marius
AU - Zhu, Rongwu
AU - Buticchi, Giampaolo
AU - Ebel, Thomas
AU - Liserre, Marco
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/5/17
Y1 - 2017/5/17
N2 - DC-link capacitors are one of the components which fail the most in back-to-back converters (B2B) of wind turbine systems (WTS) with doubly-fed induction generators (DFIG). Due to its frequency and temperature dependent equivalent series resistance (ESR) additional low frequency current components, which have not been considered during the design stage of the converter, can cause significant additional losses which in turn lead to a decreasing lifetime of the capacitor. Unbalanced grid voltages in WTS with DFIG lead to low frequency components in the capacitor current's spectrum, which are caused by components from the grid-side converter as well as from the rotor-side converter because of the direct connection of the DFIG's stator to the grid. Therefore, in this paper, the study of impacts of unbalanced grid voltages on the hotspot temperature of DC-link capacitors in WTS with DFIG is proposed. A small scale laboratory demonstrator is presented and the measurement results are in accordance with the expectations based on analytical and simulations findings.
AB - DC-link capacitors are one of the components which fail the most in back-to-back converters (B2B) of wind turbine systems (WTS) with doubly-fed induction generators (DFIG). Due to its frequency and temperature dependent equivalent series resistance (ESR) additional low frequency current components, which have not been considered during the design stage of the converter, can cause significant additional losses which in turn lead to a decreasing lifetime of the capacitor. Unbalanced grid voltages in WTS with DFIG lead to low frequency components in the capacitor current's spectrum, which are caused by components from the grid-side converter as well as from the rotor-side converter because of the direct connection of the DFIG's stator to the grid. Therefore, in this paper, the study of impacts of unbalanced grid voltages on the hotspot temperature of DC-link capacitors in WTS with DFIG is proposed. A small scale laboratory demonstrator is presented and the measurement results are in accordance with the expectations based on analytical and simulations findings.
UR - http://www.scopus.com/inward/record.url?scp=85020014011&partnerID=8YFLogxK
U2 - 10.1109/APEC.2017.7930790
DO - 10.1109/APEC.2017.7930790
M3 - Conference contribution
AN - SCOPUS:85020014011
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 816
EP - 823
BT - 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017
Y2 - 26 March 2017 through 30 March 2017
ER -
