NDLI: Switching-Cycle State-Space Modeling and Control of the Modular Multilevel Converter

Content Provider	IEEE Xplore Digital Library
Author	Jun Wang Burgos, R. Boroyevich, D.
Copyright Year	2013
Abstract	This paper presents a new switching-cycle state-space model of the modular multilevel converter (MMC), on the basis of which unused switching states of this converter are explored and a corresponding new control method is proposed. This paper begins with a comprehensive summary and analysis on the prior-art modeling approaches of the MMC, where various models used for the MMC are discussed, and their limits in controlling the converter are shown. This is followed by the complete derivation of the proposed state-space switching model, whose mathematical derivation leverages simply on state variable transformations and Kirchhoff's voltage law without losing any circuital characteristics of the converter. As a result, all the possible switching states-many of those not previously used-and operating modes of the converter are effectively unveiled. With it, a switching-cycle control approach is proposed taking advantage of the developed state-space switching model. The new control scheme can greatly reduce the cell capacitance and arm inductance value, as well as enable the MMC to operate at any ac terminal frequency without affecting the voltage ripple of its capacitors. Simulation results are shown to validate the converter operations using the new control scheme.
Starting Page	1159
Ending Page	1170
Page Count	12
File Size	4035174
File Format	PDF
ISSN	21686777
Volume Number	2
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Integrated circuit modeling Mathematical model Capacitors Voltage control Equations Switches Inductors switching-cycle control Grid-interfaced converter modular multilevel converter (MMC) switching model
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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