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Submodule power losses balancing algorithms for the modular multilevel converter

Picas, R.; Pou, J.; Zaragoza, J.; Watson, A.; Konstantinou, G.; Ceballos, S.; Clare, J.

Authors

R. Picas

J. Pou

J. Zaragoza

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ALAN WATSON ALAN.WATSON@NOTTINGHAM.AC.UK
Associate Professor

G. Konstantinou

S. Ceballos

J. Clare



Abstract

Tolerance and component aging can cause significant differences in the capacitance values of the submodules (SMs) in a modular multilevel converter (MMC). Depending on the modulation technique, capacitance mismatches may produce uneven switching transitions of the SMs, hence imbalances in the power losses that can lead to reliability problems. In this paper, a new algorithm that helps to achieve evenly distributed switching and conduction losses within the converter SMs is presented. The proposed algorithm is based on a modification of the common voltage balancing algorithms, balancing a weighted function of voltage and losses. Even distribution of power losses is achieved at the cost of slightly increasing the capacitor voltage ripples. The effectiveness of the strategy has been demonstrated by simulation results of a high-power grid-connected MMC.

Citation

Picas, R., Pou, J., Zaragoza, J., Watson, A., Konstantinou, G., Ceballos, S., & Clare, J. (2016). Submodule power losses balancing algorithms for the modular multilevel converter. In IECON 2016 Proceedings - 42nd Annual Conference of the IEEE Industrial Electronics Society (5064-5069). https://doi.org/10.1109/IECON.2016.7793381

Conference Name 42nd Annual Conference of IEEE Industrial Electronics Society (IECON 2016)
Conference Location Florence, Italy
Start Date Oct 23, 2016
End Date Oct 26, 2016
Acceptance Date Jun 24, 2016
Publication Date 2016
Deposit Date Feb 8, 2017
Publicly Available Date Mar 29, 2024
Peer Reviewed Peer Reviewed
Pages 5064-5069
Book Title IECON 2016 Proceedings - 42nd Annual Conference of the IEEE Industrial Electronics Society
ISBN 978-1-5090-3475-8
DOI https://doi.org/10.1109/IECON.2016.7793381
Keywords Modular multilevel converter, Power losses, Capacitor voltage ripples, Reliability improvement
Public URL https://nottingham-repository.worktribe.com/output/821528
Publisher URL http://ieeexplore.ieee.org/document/7793381/
Related Public URLs http://www.iecon2016.org/
Additional Information © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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