A comparative study of AC-link and DC-link based frequency converters

Kuang Zhang, Luowei Wen, Zhi Geng, Dariusz Czarkowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Frequency converters are widely used in variable speed drives, aircraft power supplies and wind energy applications. Traditional frequency converters are based on the DC-link topology. Large electrolytic capacitors are needed to eliminate the ripples in the DC stage. The size, lifetime and reliability of those capacitors are detrimental to system power density and robustness. The hard-switching loss of DC-link based frequency converter is also a considerable disadvantage of this topology. Recent studies of frequency converters are focusing on a new topology based on the AC-link. This new topology utilizes an LC resonating pair between the rectifier and the inverter. By controlling the charging and discharging time of the LC resonating pair, the converter is capable of delivering power in different frequency and magnitude. In addition, soft-switching can be obtained in the AC-link based frequency converter, which increases the system efficiency. The elimination of electrolytic capacitors also reduces the size of the converter which improves system power density and reliability. For comparison, both topologies are simulated in Matlab and implemented in hardware. A 45 kW prototype is designed, assembled, and tested in the lab. Experimental results are presented at the end of this paper.

Original languageEnglish (US)
Title of host publicationProceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018
EditorsArtde Donald Kin-Tak Lam, Stephen D. Prior, Teen-Hang Meen
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages461-464
Number of pages4
ISBN (Electronic)9781538643426
DOIs
StatePublished - Jun 22 2018
Event4th IEEE International Conference on Applied System Innovation, ICASI 2018 - Chiba, Japan
Duration: Apr 13 2018Apr 17 2018

Publication series

NameProceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018

Other

Other4th IEEE International Conference on Applied System Innovation, ICASI 2018
CountryJapan
CityChiba
Period4/13/184/17/18

Keywords

  • AC-link
  • DC-link
  • efficiency
  • frequency converter

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Energy Engineering and Power Technology
  • Control and Systems Engineering
  • Mechanical Engineering
  • Control and Optimization
  • Modeling and Simulation
  • Biomedical Engineering

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  • Cite this

    Zhang, K., Wen, L., Geng, Z., & Czarkowski, D. (2018). A comparative study of AC-link and DC-link based frequency converters. In A. D. K-T. Lam, S. D. Prior, & T-H. Meen (Eds.), Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018 (pp. 461-464). (Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICASI.2018.8394285