NDLI: Tolerance-band modulation methods for modular multilevel converters

Content Provider	IEEE Xplore Digital Library
Author	Hassanpoor, A. Ilves, K. Norrga, S. Angquist, L. Nee, H.-P.
Copyright Year	2013
Description	Author affiliation: R. Inst. of Technol., Stockholm, Sweden (Hassanpoor, A.; Ilves, K.; Norrga, S.; Angquist, L.; Nee, H.-P.)
Abstract	Modular multilevel converters (M2C) are increasingly used in high voltage direct current (HVDC) systems. The efficiency of M2Cs is highly related to the modulation method which determines the switching frequency and capacitor voltage ripple in the converter station. A new approach to modulation of M2C is presented in this paper. Tolerance-band methods are employed to obtain switching instants, and also cell selection. The proposed methods overcome the modulation problem for converters with few numbers of cells and also reduce the sorting efforts for cell balancing purposes while maintaining the cell-capacitor voltage limits. The evaluation is done by time-domain simulation by which the performance of each method is studied in both steady-state and transient cases. It is observed that using tolerance band methods not only reduces the switching frequency but also allows for handling severe fault cases in a grid connected system. Use of this method can reduce the switching losses and also allow for reduction of the cell capacitor size.
Starting Page	1
Ending Page	10
File Size	1808913
Page Count	10
File Format	PDF
ISBN	9781479901166
DOI	10.1109/EPE.2013.6632010
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-02
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High voltage power converters Switching losses Switching frequency Capacitors Modulation Switches Voltage Source Converter (VSC) Voltage control Sorting HVDC
Content Type	Text
Resource Type	Article

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