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Submodule power losses balancing algorithms for the modular multilevel converter

Picas, R.; Pou, J.; Zaragoza, J.; Watson, Alan James; Konstantinou, G.; Ceballos, S.; Clare, Jon C.

Authors

R. Picas

J. Pou

J. Zaragoza

Alan James Watson alan.watson@nottingham.ac.uk

G. Konstantinou

S. Ceballos

Jon C. Clare jon.clare@nottingham.ac.uk



Abstract

Tolerance and component aging can cause signif¬icant 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.

Publication Date Oct 26, 2016
Peer Reviewed Peer Reviewed
APA6 Citation Picas, R., Pou, J., Zaragoza, J., Watson, A. J., Konstantinou, G., Ceballos, S., & Clare, J. C. (2016). Submodule power losses balancing algorithms for the modular multilevel converter
Keywords Modular multilevel converter, Power losses, Capacitor voltage ripples, Reliability improvement
Publisher URL http://ieeexplore.ieee.org/document/7793381/
Related Public URLs http://www.iecon2016.org/
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
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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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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