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

QC 20190404
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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Modular multilevel converters
ac/ac converters
current control
voltage control
admittance
frequency-domain analysis
linearization techniques
stability
railway engineering.
Electrical Engineering
Elektro- och systemteknik

By the author/editor: Bessegato, Luca; Ilves, Kalle; Harnefors, Lenna ...; Norrga, Staffan, ...; Östlund, Stefan, ...

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