期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 35, 期 3, 页码 2411-2423出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2930321
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
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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