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Tolerance-band modulation methods for modular multilevel converters
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion. (High Power Electronics)ORCID iD: 0000-0001-8788-0415
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion. (High Power Electronics)
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion. (High Power Electronics)ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion. (High Power Electronics)
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2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
IEEE , 2013. 1-10 p.
Keyword [en]
Capacitors;Modulation;Sorting;Switches;Switching frequency;Voltage control;HVDC;High voltage power converters;Switching losses;Voltage Source Converter (VSC)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-134878DOI: 10.1109/EPE.2013.6632010Scopus ID: 2-s2.0-84890192796OAI: oai:DiVA.org:kth-134878DiVA: diva2:668811
Conference
15th European Conference on Power Electronics and Applications (EPE), 2013
Funder
StandUp
Note

QC 20140129

Available from: 2013-12-02 Created: 2013-12-01 Last updated: 2016-02-25Bibliographically approved

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Hassanpoor, ArmanNorrga, StaffanNee, Hans-Peter

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  • apa
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