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 and Hackl, Christoph (2018) An integrated converter and machine control system for MMC-based high power drives. IEEE Transactions on Industrial Electronics . ISSN 1557-9948

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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.

Item Type: Article
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.
Keywords: Modular Multilevel Converter, variable speed drive, voltage balancing, flux-weakening operation
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number:
Depositing User: Burns, Rebecca
Date Deposited: 08 Mar 2018 08:52
Last Modified: 04 May 2020 19:30

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