Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (3): 21-28.

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Reliability Analysis of Grid-Interfaced Filter Capacitors

Dao Zhou*, Haoran Wang, Huai Wang, Frede Blaabjerg   

  1. Department of Energy Technology, Aalborg University, Aalborg, 9220, Denmark
  • Online:2018-09-25 Published:2019-10-31
  • Contact: * , E-mail:zda@et.aau.dk.
  • About author:Dao Zhou received the B.S. from Beijing Jiaotong University, Beijing, China, in 2007, the M. S. from Zhejiang University, Hangzhou, China, in 2010, and the Ph.D. from Aalborg University, Aalborg, Denmark, in 2014, all in electrical engineering. Since 2014, he has been with Department of Energy Technology, Aalborg University, where currently he is an Assistant Professor. His research interests include modeling, control, and reliability of power electronics in renewable energy application. Dr. Zhou received a few IEEE Prize Paper Awards. Haoran Wang received the B.S. and M.S. degrees in control science and engineering from Wuhan University of Technology, Wuhan, China, in 2012 and 2015, respectively. He is currently a PhD fellow in Center of Reliable Power Electronics(CORPE), Aalborg University, Aalborg, Denmark. From Aug. 2013 to Sep. 2014, he was research assistant with the Department of Electrical Engineering, Tsinghua University, Beijing, China. He was a Visiting Scientist with the ETH Zurich, Switzerland, from Dec. 2017 to Apr. 2018. Huai Wang received the B.E. degree in electrical engineering, from Huazhong University of Science and Technology, Wuhan, China, in 2007 and the Ph.D. degree in power electronics, from the City University of Hong Kong, Hong Kong, in 2012. He is currently an Associate Professor at the Center of Reliable Power Electronics(CORPE), aalborg university, aalborg, denmark. He was a Visiting Scientist with the ETH Zurich, Switzerland, from Aug. to Sep. 2014, and with the Massachusetts Institute of Technology (MIT), USA, from Sep. to Nov. 2013. He was with the ABB Corporate Research Center, Switzerland, in 2009. His research addresses the fundamental challenges in modelling and validation of power electronic component failure mechanisms, and application issues in system-level predictability, condition monitoring, circuit architecture, and robustness design. Dr. Wang received the Richard M. Bass Outstanding Young Power Electronics Engineer Award from the IEEE Power Electronics Society in 2016, and the Green Talents Award from the German Federal Ministry of Education and Research in 2014. He is currently the Award Chair of the Technical Committee of the High Performance and Emerging Technologies, IEEE Power Electronics Society, and the Chair of IEEE PELS/IAS/IE Chapter in Denmark. He serves as an Associate Editor of IET power electronics, IEEE journal of emerging and selected topics in power electronics, and IEEE transactions on power electronics. Frede Blaabjerg was with ABB-Scandia, Randers, Denmark, from 1987 to 1988. From 1988 to 1992, he got the Ph.D. degree in Electrical Engineering at Aalborg University in 1995. He became an Assistant Professor in 1992, an Associate Professor in 1996, and a Full Professor of power electronics and drives in 1998. From 2017 he became a Villum Investigator. His current research interests include power electronics and its applications such as in wind turbines, PV systems, reliability, harmonics and adjustable speed drives. He has published more than 500 journal papers in the fields of power electronics and its applications. He is the co-author of two monographs and editor of 6 books in power electronics and its applications. He has received 24 IEEE Prize Paper Awards, the IEEE PELS Distinguished Service Award in 2009, the EPE-PEMC Council Award in 2010, the IEEE William E. Newell Power Electronics Award 2014 and the Villum Kann Rasmussen Research Award 2014. He was the Editor-in- Chief of the IEEE transactions on power electronics from 2006 to 2012. He has been Distinguished Lecturer for the IEEE Power Electronics Society from 2005 to 2007 and for the IEEE Industry Applications Society from 2010 to 2011 as well as 2017 to 2018. He is nominated in 2014, 2015, 2016 and 2017 by Thomson Reuters to be between the most 250 cited researchers in Engineering in the world. In 2017 he became Honoris Causa at University Politehnica Timisoara(UPT), Romania.

Abstract: Growing with the increased adoption of renewable energy for the power generation, the reliable and cost-effective operation of grid-connected inverters is of more and more importance. A filter is interfaced between an inverter and the utility grid to reduce the switching harmonics. According to the modulation scheme and the LCL filter impedance, the electrical stresses of the filter capacitor can be thoroughly investigated. With the help of the electro-thermal model, its long-term thermal stress can be obtained based on the mission profile like wind speed, ambient temperature. The reliability of the filter capacitor bank is obtained based on its individual capacitor reliability curves and reliability block diagram method. A case study on a 2MW wind turbine system demonstrates the relationship between the lifetime of the capacitor bank and the single capacitor. Moreover, the severe voltage and current stresses of the filter capacitors are analyzed during abnormal operations (e.g., fault ride-through) with asymmetrical parasitic parameters.

Key words: Metalized polypropylene film capacitor, reliability, doubly-fed induction generator, fault ride-through