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Space Vector Modulation for Mutually Commutated Isolated Three-Phase Converter Systems
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.ORCID iD: 0000-0002-8565-4753
2008 (English)In: 39th IEEE Power Electronic Specialists Conference (PESC 08) Rhodes, GREECE, JUN 15-19, 2008, 2008, 4465-4471 p.Conference paper, Published paper (Refereed)
Abstract [en]

Converter systems consisting of a voltage source converter and a cycloconverter connected by a medium-frequency transformer have several attractive properties. They offer bidirectional AC/DC conversion as well as voltage transformation and isolation by the transformer. Furthermore, it is possible to achieve soft-switching conditions for all semiconductor devices by consistently commutating the two converters in alternation; hence the name "mutually commutated converter system". Such a commutation scheme, however, imposes certain restrictions on the modulation of the converter system. A newly proposed space vector oriented modulation method promises superior performance compared to carrier-based modulation methods. This paper describes the implementation of the considered space vector modulation on the example of a 40 WA prototype converter system. The experimental results show that the evaluated space vector modulation is particularly beneficial at low output voltages due to its inherent nature of maximizing the zero voltage vectors.

Place, publisher, year, edition, pages
2008. 4465-4471 p.
Series
IEEE power electronics specialists conference records, ISSN 0275-9306
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-14304ISI: 000260398502252Scopus ID: 2-s2.0-52349101714OAI: oai:DiVA.org:kth-14304DiVA: diva2:332108
Note
QC 20100802Available from: 2010-08-02 Created: 2010-08-02 Last updated: 2010-08-02Bibliographically approved
In thesis
1. System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms
Open this publication in new window or tab >>System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

 

In this thesis, a new HVDC-based converter system for wind farms is investigated. It is based on a mutually commutated soft-switching converter system and provides a unique integrated solution for the wind turbine generator drive systems, the wind turbine interconnection, and the power conversion for HVDC transmission.

In a wind farm, the mutually commutated converter system is a distributed system. A medium-frequency collection grid connects the converter station, equipped with a single-phase voltage source converter and a medium-frequency transmission transformer, with the wind turbines, each containing a cycloconverter and a medium-frequency distribution transformer. In this thesis, various system aspects regarding the application of a distributed mutually commutated converter system in a wind farm are investigated. Special attention is paid to the design of a medium-frequency collection grid that has an acceptable level of transient overvoltages, the design of medium-frequency transformers with suitable magnetic, electric and thermal properties, and the development of a strategy to commutate the voltage source converter during low power generation.

In order to adapt the mutually commutated converter system for an application in a wind farm, it had to be further developped. Different carrier-based and space-vector oriented modulation methods have been investigated. It turns out that for any load angle there is a quasi-discontinuous pulse width modulation strategy that can produce the same pulse patterns as space vector modulation. In addition, a modulation strategy has been developed that allows to replace the IGBTs in the cycloconverter with cheap, robust, and reliable fast thyristors, despite their absence of turn-off capability. The feasibility of different modulation strategies for mutually commutated converter systems has been verified on a down-scaled prototype converter system with both IGBT- and thyristor-based cycloconverters.

Finally, a feasible wind farm layout is proposed, which considerably reduces the energy generation costs for large winds farms distant to a strong grid connection point. As a consequence, the proposed solution may facilitate the establishment of remotely located wind farms.

 

Place, publisher, year, edition, pages
Stockholm, Sweden: KTH, 2009. viii, 80 p.
Series
Trita-EE, ISSN 1653-5146 ; 2009:018
Keyword
Isolated AC/DC Converter, Mutual Commutation, Soft Switching, Voltage Source Converter, Cycloconverter, Modulation Strategies, Medium-Frequency Transformer, HVDC Transmission, Wind Power, Wind Farms
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-10267 (URN)978-91-7415-292-0 (ISBN)
Public defence
2009-05-18, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100802Available from: 2009-05-12 Created: 2009-04-28 Last updated: 2010-08-03Bibliographically approved

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Norrga, Staffan

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