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

Espinoza-B, Mauricio; C�rdenas, Roberto; Clare, Jon; Soto-Sanchez, Diego; Diaz, Matias; Espina, Enrique; Hackl, Christoph

Abstract

© 2018 IEEE. The modular multilevel converter (MMC) is a promising topology for high-power drive applications. However, large voltage fluctuations can be produced in the floating capacitors when the machine operates 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 predefined threshold. The proposed control system is also augmented using flux-weakening operation of the machine at low rotational speeds. An experimental prototype composed of 18 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.

Citation

Espinoza-B, M., Cárdenas, R., Clare, J., Soto-Sanchez, D., Diaz, M., Espina, E., & Hackl, C. (2019). An integrated converter and machine control system for MMC-based high-power drives. IEEE Transactions on Industrial Electronics, 66(3), 2343-2354. https://doi.org/10.1109/TIE.2018.2801839

• Journal Article Type: Article
• Acceptance Date: Jan 9, 2018
• Online Publication Date: Feb 5, 2018
• Publication Date: Mar 1, 2019
• Deposit Date: Mar 8, 2018
• Publicly Available Date: Mar 8, 2018
• 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: 66
• Issue: 3
• Pages: 2343-2354
• DOI: https://doi.org/10.1109/TIE.2018.2801839
• Keywords: Modular Multilevel Converter, variable; speed drive, voltage balancing, flux-weakening operation
• Public URL: https://nottingham-repository.worktribe.com/output/910044
• Publisher URL: http://ieeexplore.ieee.org/document/8281073/
• 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.