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Evaluation of different carrier-based PWM methods for modular multilevel converters for HVDC application
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0001-8788-0415
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-1755-1365
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2012 (English)In: IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, IEEE , 2012, 388-393 p.Conference paper, Published paper (Refereed)
Abstract [en]

The outstanding features of modular multilevel converters (M2C) make it attractive for high voltage direct current (HVDC) systems. In order to achieve high efficiency in HVDC converter stations, the switching frequency and the capacitor voltage ripple of the converter should be minimized. A suitable modulation algorithm should achieve an optimal tradeoff between these two requirements. This paper evaluates different carrier-based PWM algorithms and discusses the most challenging technical aspects of an efficient M2C. It is observed that decoupling the waveform synthesis from the selection of which cell to switch at each instant has beneficial impact on operation performance. The evaluation is done by time-domain simulation considering a grid connected, three-phase M2C converter and an advanced control system. Results of this study can be used for implementing more economical HVDC converters.

Place, publisher, year, edition, pages
IEEE , 2012. 388-393 p.
Series
IEEE Industrial Electronics Society. Annual Conference. Proceedings, ISSN 1553-572X
Keyword [en]
carrier-based PWM, cell number optimization, low switching frequency
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-107765DOI: 10.1109/IECON.2012.6388789ISI: 000316962900059Scopus ID: 2-s2.0-84872974834ISBN: 978-146732421-2 (print)OAI: oai:DiVA.org:kth-107765DiVA: diva2:578083
Conference
38th Annual Conference on IEEE Industrial Electronics Society, IECON 2012; Montreal, QC; 25 October 2012 through 28 October 2012
Funder
StandUp
Note

QC 20130218

Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2016-09-16Bibliographically approved
In thesis
1. Modulation of Modular Multilevel Converters for HVDC Transmission
Open this publication in new window or tab >>Modulation of Modular Multilevel Converters for HVDC Transmission
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The outstanding features of modular multilevel converters (MMC) have recently gained much attention in the high-voltage direct-current (HVDC) transmission field. Power quality, converter cost and system performance are three crucial aspects of HVDC MMCs which are directly linked to the converter modulation and switching schemes. High power quality and performance require high switching frequency and large cell capacitor whereas low switching frequency and small cell capacitor are needed to reduce the converter cost.

The main objective of this thesis is to propose a practical switching method for HVDC MMCs which balances the aforementioned contradictory requirements. A mathematical analysis of the converter switching pattern, against the power quality and converter cost, has been conducted to formulate an optimization problem for MMCs. Different objective functions are studied for the formulated optimization problem such as converter loss minimization, voltage imbalance minimization and computational burden minimization. This thesis proposes three methods to address different objective functions. Ultimately, a real-time simulator has been built to practically verify and investigate the performance of the proposed methods in a realistic point-to-point HVDC link.

The most significant outcome of this thesis is the tolerance band-based switching scheme which offers a direct control of the cell capacitor voltage, low power losses, and robust dynamic performance. As a result, the converter switching frequency can reach frequencies as low as 70 Hz (with the proposed cell tolerance band (CTB) method). A modified optimized CTB method is proposed to minimize the converter switching losses and it could reduce the converter switching losses by 60% in comparison to the conventional phase shifted carrier modulation method.

It is concluded intelligent utilization of sorting algorithm can enable efficient HVDC station operation by reducing the converter cost.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 57 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2016:139
Keyword
HVDC, switching schemes, modulation, high power converters, power grids
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-192607 (URN)978-91-7729-098-8 (ISBN)
Public defence
2016-10-07, Sal D3, Kungl Tekniska Högskolan, Lindstedtsvägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20160916

Available from: 2016-09-16 Created: 2016-09-15 Last updated: 2016-09-16Bibliographically approved

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Hassanpoor, ArmanNorrga, StaffanNee, Hans-Peter

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