Skip to main content

Research Repository

Advanced Search

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

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


Mauricio Espinoza

Roberto Cardenas

Matias Diaz

Profile Image

Professor of Power Electronics


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.


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.

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 Jul 4, 2017
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
Keywords Modular multilevel converter, Variable speed drives, Low-frequency operation, Voltage balancing
Public URL
Publisher URL
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


You might also like

Downloadable Citations