Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies
IEEE Transactions on Power Electronics(2020)
摘要
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.
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关键词
Rail transportation,Power supplies,Stability criteria,Admittance,Voltage control,Capacitors,AC,AC converters,admittance,current control,frequency-domain analysis,linearization techniques,modular multilevel converters (MMCs),railway engineering,stability,voltage control
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