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 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Rail transportation

Power supplies

Stability criteria

Admittance

Voltage control

Capacitors

AC

AC converters

current control

frequency-domain analysis

linearization techniques

modular multilevel converters (MMCs)

railway engineering

stability

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)