NDLI: Operation of Modular Multilevel Converters under grid asymmetries

Content Provider	IEEE Xplore Digital Library
Author	Vasiladiotis, M. Cherix, N. Siemaszko, D. Rufer, A.
Copyright Year	2013
Description	Author affiliation: Lab. of Ind. Electron. (LEI), Ecole Polytech. Fed. de Lausanne (EPFL), Lausanne, Switzerland (Vasiladiotis, M.; Cherix, N.; Siemaszko, D.; Rufer, A.)
Abstract	The Modular Multilevel Converter is very likely to operate in a grid-connected mode under asymmetric conditions. Such a converter features several unique characteristics, which make its analysis different from other types of power converters in similar cases. The existence of three independent capacitive phase legs rather than a common DC-link capacitor requires special attention, in terms of stability and component dimensioning. This paper investigates the impact of unbalanced grid conditions on the operation of the Modular Multilevel Converter. The expressions for the branch energy variation are derived assuming that the grid-related quantities can be modeled by means of symmetrical components. Moreover, the effect of circulating current control for capacitive storage reduction as well as DC-link oscillation elimination is also studied. Finally, a control system is proposed and simulation results verify its discrete-time implementation.
Sponsorship	IEEE Ind. Electron. Soc.
Starting Page	6281
Ending Page	6286
File Size	1680496
Page Count	6
File Format	PDF
ISBN	9781479902248
ISSN	1553572X
DOI	10.1109/IECON.2013.6700168
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-10
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Harmonic analysis Oscillators Power system harmonics Capacitors Current control Modulation Programmable logic arrays circulating current Modular Multilevel Converter grid asymmetries symmetrical components converter control capacitive energy energy variation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Impact of Grid Asymmetries on the Operation and Capacitive Energy Storage Design of Modular Multilevel Converters

Utilising redundant voltage levels for circulating current control in modular multilevel converters

Control strategy to balance operation of parallel connected legs of modular multilevel converters

Eliminating the influence of capacitor voltage ripple on current control for grid-connected modular multilevel converter

Operation of modular multilevel converters under voltage constraints

A Repetitive Control Scheme for Harmonic Suppression of Circulating Current in Modular Multilevel Converters

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New modulation scheme for bidirectional qZS modular multi-level converters

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Operation of Modular Multilevel Converters under grid asymmetries

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