An Integrated Converter and Machine Control System for MMC-Based High-Power Drives | IEEE Journals & Magazine | IEEE Xplore

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives


Abstract:

The modular multilevel converter (MMC) is a promising topology for high-power drive applications. However, large voltage fluctuations can be produced in the floating capa...Show More

Abstract:

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.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 66, Issue: 3, March 2019)
Page(s): 2343 - 2354
Date of Publication: 05 February 2018

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