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An integrated converter and machine control system for MMC-based high power drives

Espinoza, Mauricio; Cardenas, Roberto; Clare, Jon C.; Soto-Sanchez, Diego; Diaz, Matias; Espina, Enrique; Hackl, Christoph

Authors

Mauricio Espinoza

Roberto Cardenas rcd@ieee.org

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

Diego Soto-Sanchez

Matias Diaz

Enrique Espina

Christoph Hackl



Abstract

The Modular Multilevel Converter (MMC) is a promising topology for high power drive applications. However, large voltage fluctuations are produced in the floating capacitors when the machine is operating with high stator currents at low rotational speed. To compensate these oscillations, relatively large mitigation currents are required to keep the capacitor voltages within an acceptable range.
In this paper, a new integrated control scheme is discussed to regulate the voltage fluctuations. The strategy is based on closed-loop vector-control of the voltage fluctuations, maintaining them inside a pre-defined threshold. The proposed control system is also augmented using flux weakening operation of the machine at low rotational speeds. An experimental prototype composed of eighteen power cells, feeding a vector-controlled induction machine in the whole speed range, is used to validate the effectiveness and feasibility of the proposed control strategies.

Journal Article Type Article
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
APA6 Citation Espinoza, M., Cardenas, R., Clare, J. C., Soto-Sanchez, D., Diaz, M., Espina, E., & Hackl, C. (in press). An integrated converter and machine control system for MMC-based high power drives. IEEE Transactions on Industrial Electronics, doi:10.1109/TIE.2018.2801839
DOI https://doi.org/10.1109/TIE.2018.2801839
Keywords Modular Multilevel Converter, variable
speed drive, voltage balancing, flux-weakening operation
Publisher URL http://ieeexplore.ieee.org/document/8281073/
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information M. Espinoza et al., "An Integrated Converter and Machine Control System for MMC-Based High Power Drives," in IEEE Transactions on Industrial Electronics, vol. PP, no. 99, pp. 1-1. doi: 10.1109/TIE.2018.2801839
c2018 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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