An Integrated Converter and Machine Control System for MMC-Based High-Power Drives
Espinoza-B, Mauricio
Universidad Costa Rica
Cardenas, Roberto
Universidad de Chile
Clare, Jon
University of Nottingham
Diaz, Matias
Universidad de Santiago de Chile
Espina, Enrique
Universidad de Chile
Hackl, Christoph M.
University of Munich
Journal
IEEE Transactions on Industrial Electronics
ISSN
0278-0046
1557-9948
Open Access
closed
Volume
66
Start page
2343
End page
2354
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.
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Type
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