An Improved Circulating Current Injection Method for Modular Multilevel Converters in Variable-Speed Drives

Binbin Li; Shaoze Zhou; Dandan Xu; Rongfeng Yang; Dianguo Xu; Concettina Buccella; Carlo Cecati

doi:10.1109/TIE.2016.2547899

An Improved Circulating Current Injection Method for Modular Multilevel Converters in Variable-Speed Drives

Binbin Li
, Shaoze Zhou
, Dandan Xu
, Rongfeng Yang
, Dianguo Xu
, Concettina Buccella
, Carlo Cecati

School of Electrical Engineering and Automation, Harbin Institute of Technology
State Grid Sichuan Electric Power Corporation
University of L'Aquila

Research output: Contribution to journal › Article › peer-review

220 Scopus citations

Abstract

Modular multilevel converters (MMC) represent an interesting and emerging topology in medium-voltage motor drive applications. The main challenge of using such a topology in variable-speed drives is the large voltage ripple of submodule capacitors at low speed with constant torque. In this paper, an improved circulating current injection method is proposed, which does not completely eliminate the capacitor voltage ripple, but maintains it bounded within reasonable values. As a result, magnitude of injected circulating current is reduced, leading to converter efficiency improvement and reduction of semiconductor current ratings. Dimensioning of submodule capacitance is also discussed, which is an important consideration when designing the MMCs in variable-speed drives. The proposed method has been successfully validated by simulation and experimental results.

Original language	English
Article number	7442889
Pages (from-to)	7215-7225
Number of pages	11
Journal	IEEE Transactions on Industrial Electronics
Volume	63
Issue number	11
DOIs	https://doi.org/10.1109/TIE.2016.2547899
State	Published - Nov 2016
Externally published	Yes

Keywords

Capacitance dimensioning
capacitor voltage ripple
circulating current injection
modular multilevel converter
submodule (SM)
variable-speed drives

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10.1109/TIE.2016.2547899

Cite this

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title = "An Improved Circulating Current Injection Method for Modular Multilevel Converters in Variable-Speed Drives",

abstract = "Modular multilevel converters (MMC) represent an interesting and emerging topology in medium-voltage motor drive applications. The main challenge of using such a topology in variable-speed drives is the large voltage ripple of submodule capacitors at low speed with constant torque. In this paper, an improved circulating current injection method is proposed, which does not completely eliminate the capacitor voltage ripple, but maintains it bounded within reasonable values. As a result, magnitude of injected circulating current is reduced, leading to converter efficiency improvement and reduction of semiconductor current ratings. Dimensioning of submodule capacitance is also discussed, which is an important consideration when designing the MMCs in variable-speed drives. The proposed method has been successfully validated by simulation and experimental results.",

keywords = "Capacitance dimensioning, capacitor voltage ripple, circulating current injection, modular multilevel converter, submodule (SM), variable-speed drives",

author = "Binbin Li and Shaoze Zhou and Dandan Xu and Rongfeng Yang and Dianguo Xu and Concettina Buccella and Carlo Cecati",

note = "Publisher Copyright: {\textcopyright} 2016 IEEE.",

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doi = "10.1109/TIE.2016.2547899",

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T1 - An Improved Circulating Current Injection Method for Modular Multilevel Converters in Variable-Speed Drives

AU - Li, Binbin

AU - Zhou, Shaoze

AU - Xu, Dandan

AU - Yang, Rongfeng

AU - Xu, Dianguo

AU - Buccella, Concettina

AU - Cecati, Carlo

PY - 2016/11

Y1 - 2016/11

N2 - Modular multilevel converters (MMC) represent an interesting and emerging topology in medium-voltage motor drive applications. The main challenge of using such a topology in variable-speed drives is the large voltage ripple of submodule capacitors at low speed with constant torque. In this paper, an improved circulating current injection method is proposed, which does not completely eliminate the capacitor voltage ripple, but maintains it bounded within reasonable values. As a result, magnitude of injected circulating current is reduced, leading to converter efficiency improvement and reduction of semiconductor current ratings. Dimensioning of submodule capacitance is also discussed, which is an important consideration when designing the MMCs in variable-speed drives. The proposed method has been successfully validated by simulation and experimental results.

AB - Modular multilevel converters (MMC) represent an interesting and emerging topology in medium-voltage motor drive applications. The main challenge of using such a topology in variable-speed drives is the large voltage ripple of submodule capacitors at low speed with constant torque. In this paper, an improved circulating current injection method is proposed, which does not completely eliminate the capacitor voltage ripple, but maintains it bounded within reasonable values. As a result, magnitude of injected circulating current is reduced, leading to converter efficiency improvement and reduction of semiconductor current ratings. Dimensioning of submodule capacitance is also discussed, which is an important consideration when designing the MMCs in variable-speed drives. The proposed method has been successfully validated by simulation and experimental results.

KW - Capacitance dimensioning

KW - capacitor voltage ripple

KW - circulating current injection

KW - modular multilevel converter

KW - submodule (SM)

KW - variable-speed drives

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U2 - 10.1109/TIE.2016.2547899

DO - 10.1109/TIE.2016.2547899

M3 - 文章

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JF - IEEE Transactions on Industrial Electronics

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M1 - 7442889

ER -

An Improved Circulating Current Injection Method for Modular Multilevel Converters in Variable-Speed Drives

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Keywords

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