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An enhanced dq-based vector control system for modular multilevel converters feeding variable speed drives

Espinoza, Mauricio; Cardenas, Roberto; Diaz, Matias; Clare, Jon C.

Authors

Mauricio Espinoza

Roberto Cardenas

Matias Diaz

Jon C. Clare



Abstract

Modular multilevel converters (M2C) are considered an attractive solution for high power drive applications. However, energy balancing within the converter is complex to achieve, particularly when the machine is operating at low rotational speeds. In this paper, a new control system, based on cascaded control loops and a vector-power-voltage (vPV) model of the M2C, is proposed. The control system is implemented in a dq-synchronous frame rotating at ωe rad/s with the external loop regulating the capacitor voltages using proportional-integral (PI) controllers. The internal loop controls the converter currents using PI and resonant controllers. In addition, the control systems required to operate the machine at other points, i.e., at medium and high rotational speeds, are also discussed in this paper. Experimental results obtained with an M2C-based drive laboratory prototype with 18 power cells are presented in this paper.

Citation

Espinoza, M., Cardenas, R., Diaz, M., & Clare, J. C. (2017). An enhanced dq-based vector control system for modular multilevel converters feeding variable speed drives. IEEE Transactions on Industrial Electronics, 64(4), 2620-2630. https://doi.org/10.1109/TIE.2016.2637894

Journal Article Type Article
Acceptance Date Oct 16, 2016
Online Publication Date Dec 12, 2016
Publication Date Apr 30, 2017
Deposit Date Jul 4, 2017
Publicly Available Date Mar 28, 2024
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
Volume 64
Issue 4
Pages 2620-2630
DOI https://doi.org/10.1109/TIE.2016.2637894
Keywords Modular multilevel converter, Variable speed drives, Low-frequency operation, Voltage balancing
Public URL https://nottingham-repository.worktribe.com/output/858026
Publisher URL http://ieeexplore.ieee.org/document/7781663/
Additional Information c2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components of this work in other works

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