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Current Control and Energy Balancing of a Square-Wave Powered 1AC-3AC Modular Multilevel Converter

Schnarrenberger, Mathias; Kammerer, Felix; Gommeringer, Mario; Kolb, Johannes; Braun, Michael

This paper presents a new control method for a Modular Multilevel Converter (MMC) fed by a push-pull converter via a medium frequency (MF) transformer. Application of this topology is a universal high-precision 3AC voltage source for a Power Hardware-in-the-Loop Emulator with a frequency range from DC up to almost the medium frequency. Advantages are high efficiency, very low harmonic distortion and high dynamics of the output voltage which can be used e.g. for simulation of electrical machines. Due to the medium frequency input of the MMC the transformer size for the galvanic isolation is much smaller compared to a low frequency input. Additionally, the required cell capacitance for the MMC is reduced which saves cost and space. The delivered medium frequency square-wave voltage requires an alternating input current of the MMC. For the square-wave powered 1AC-3AC MMC an energy and current control is proposed. Due to very high current dynamic requirements a dead-beat controller as subordinated controller is used to achieve a trapezoidal input current which allows zero current switching (ZCS) at the push-pull-converter. The design of the superposed energy and balancing controller is also shown. ... mehr

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DOI: 10.5445/IR/1000053810
DOI: 10.1109/ECCE.2015.7310170
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Elektrotechnisches Institut (ETI)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2015
Sprache Englisch
Identifikator ISBN: 978-1-4673-7151-3
KITopen-ID: 1000053810
Erschienen in Proceedings 2015 IEEE Energy Conversion Congress and Exposition (ECCE) : Montreal, Quebec, Canada, 20 - 24 September 2015
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Seiten 3607-3614
Schlagwörter Modular Multilevel Converter (MMC), control theory, energy and balancing control, galvanic isolation, zero current switching (ZCS)
Nachgewiesen in Dimensions
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