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Open AccessArticle

An Extremely High Power Density Asymmetrical Back-to-Back Converter for Aerospace Motor Drive Applications

College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China
Zhejiang University–University of Illinois at Urbana-Champaign Institute, Zhejiang University, Haining 314400, China;
College of Electrical and Computer Engineering, Ryerson University, Toronto, ON M5B2K3, Canada
Author to whom correspondence should be addressed.
Energies 2020, 13(5), 1292;
Received: 26 January 2020 / Revised: 20 February 2020 / Accepted: 3 March 2020 / Published: 10 March 2020
(This article belongs to the Special Issue Electric Systems for Transportation)
Higher-voltage-standard and higher-power-rating aerospace power systems are being investigated intensively in the aerospace industry to address challenges in terms of improving emissions, fuel economy, and also cost. Multilevel converter topologies become attractive because of their higher efficiency under high-voltage and high-switching-frequency conditions. In this paper, an asymmetrical-voltage-level back-to-back multilevel converter is proposed, which consists of a five-level (5L) rectifier stage and a three-level (3L) inverter stage. Based on the comparison, such an asymmetrical back-to-back structure can achieve high efficiency and minimize the converter weight on both rectifier and inverter sides. A compact triple-surface-mounted heatsink structure is designed to realize high density and manufacturable thermal management. This topology and structure are evaluated with a full-rating prototype. According to the evaluation, the achieved power density is 2.61 kVA/kg, which is 30% higher than that of traditional solutions. The efficiency at the rated power of the back-to-back system is 95.8%. View Full-Text
Keywords: more electric aircraft (MEA); multilevel converter; high power density more electric aircraft (MEA); multilevel converter; high power density
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MDPI and ACS Style

Zhang, Y.; Li, C.; Xu, D.; Li, W.; Zhang, J.; Ma, H.; He, X. An Extremely High Power Density Asymmetrical Back-to-Back Converter for Aerospace Motor Drive Applications. Energies 2020, 13, 1292.

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