Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies

Modular multilevel converters (MMCs) can be configured to perform ac/ac conversion, which makes them suitable as railway power supplies. In this paper, a hierarchical control scheme for ac/ac MMCs for railway power supplies is devised and evaluated, considering the requirements and the operating con...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2020-03, Vol.35 (3), p.2411-2423
Main Authors: Bessegato, Luca, Ilves, Kalle, Harnefors, Lennart, Norrga, Staffan, Ostlund, Stefan
Format: Article
Language:English
Subjects:
AC converters
AC/AC converters
Admittance
Capacitors
Control systems
Converters
current control
Electrical impedance
frequency-domain analysis
linearization techniques
Metal matrix composites
modular multilevel converters (MMCs)
Power supplies
Rail transportation
railway engineering
stability
Stability analysis
Stability criteria
Voltage control
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Summary:Modular multilevel converters (MMCs) can be configured to perform ac/ac conversion, which makes them suitable as railway power supplies. In this paper, a hierarchical control scheme for ac/ac MMCs for railway power supplies is devised and evaluated, considering the requirements and the operating conditions specific to this application. Furthermore, admittance models of the ac/ac MMC are developed, showing how the suggested hierarchical control scheme affects the three-phase and the single-phase side admittances of the converter. These models allow for analyzing the stability of the interconnected system using the impedance-based stability criterion and the passivity-based stability assessment. Finally, the findings presented in this paper are validated experimentally, using a down-scaled MMC.
ISSN:0885-8993
1941-0107
1941-0107
DOI:10.1109/TPEL.2019.2930321