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

Kuang Zhang; Luowei Wen; Zhi Geng; Dariusz Czarkowski

doi:10.1109/ICASI.2018.8394285

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

Kuang Zhang, Luowei Wen, Zhi Geng, Dariusz Czarkowski

Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English (US)
Title of host publication	Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018
Editors	Artde Donald Kin-Tak Lam, Stephen D. Prior, Teen-Hang Meen
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	461-464
Number of pages	4
ISBN (Electronic)	9781538643426
DOIs	https://doi.org/10.1109/ICASI.2018.8394285
State	Published - Jun 22 2018
Event	4th IEEE International Conference on Applied System Innovation, ICASI 2018 - Chiba, Japan Duration: Apr 13 2018 → Apr 17 2018

Publication series

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

Other

Other	4th IEEE International Conference on Applied System Innovation, ICASI 2018
Country/Territory	Japan
City	Chiba
Period	4/13/18 → 4/17/18

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

Access to Document

10.1109/ICASI.2018.8394285

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

A comparative study of AC-link and DC-link based frequency converters. / Zhang, Kuang; Wen, Luowei; Geng, Zhi et al.
Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018. ed. / Artde Donald Kin-Tak Lam; Stephen D. Prior; Teen-Hang Meen. Institute of Electrical and Electronics Engineers Inc., 2018. p. 461-464 (Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Zhang, K, Wen, L, Geng, Z & Czarkowski, D 2018, A comparative study of AC-link and DC-link based frequency converters. in ADK-T Lam, SD Prior & T-H Meen (eds), Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018. Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018, Institute of Electrical and Electronics Engineers Inc., pp. 461-464, 4th IEEE International Conference on Applied System Innovation, ICASI 2018, Chiba, Japan, 4/13/18. https://doi.org/10.1109/ICASI.2018.8394285

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

Zhang, Kuang ; Wen, Luowei ; Geng, Zhi et al. / A comparative study of AC-link and DC-link based frequency converters. Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018. editor / Artde Donald Kin-Tak Lam ; Stephen D. Prior ; Teen-Hang Meen. Institute of Electrical and Electronics Engineers Inc., 2018. pp. 461-464 (Proceedings of 4th IEEE International Conference on Applied System Innovation 2018, ICASI 2018).

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AB - 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.

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

Abstract

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Keywords

ASJC Scopus subject areas

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