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

摘要

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)Reliability-oriented 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.