Chinese Journal of Electrical Engineering ›› 2018, Vol. 4 ›› Issue (3): 29-36.

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Capacitive DC Links in Power Electronic Systems-Reliability and Circuit Design

Haoran Wang*, Huai Wang   

  1. Center of Reliable Power Electronics, Department of Energy Technology, Aalborg University, Aalborg 9220, Denmark
  • Online:2018-09-25 Published:2019-10-31
  • Contact: * , E-mail:hao@et.aau.dk.
  • About author: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 an 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.

Abstract: Capacitive DC links are an important part in voltage source power electronic converters, which contribute to cost, size and failure rate on a considerable scale. With more and more stringent constraints brought by industrial applications, the capacitive DC links encounter reliability aspect challenges. This paper presents a review on the reliability design and improvement of capacitive DC links from three aspects: 1) Quantitative reliability prediction for DC-link capacitors; 2) Reliabilityoriented design of passive DC-link capacitor banks; and 3) Advanced active DC links to exceed the limits of passive DC-link capacitors. Key solutions for each aspect are highlighted and discussed with case studies. This review serves to provide a picture of state-of-the-art research on the reliability design and improvement of capacitive DC links, highlight the key milestones in this area, and identify the corresponding challenges and future research directions.

Key words: Reliability, capacitor, DC link, power electronics