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Modulation and Power Losses of a Stacked Polyphase Bridges Converter
KTH, School of Electrical Engineering (EES), Electric power and energy systems. (Power Electronics)ORCID iD: 0000-0002-6633-8384
KTH, School of Electrical Engineering (EES), Electric power and energy systems. (Power Electronics)ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electric power and energy systems.ORCID iD: 0000-0002-6283-7661
KTH.
2016 (English)In: IEEE Journal of Emerging and Selected Topics in Power Electronics, ISSN 2168-6777, E-ISSN 2168-6785Article in journal, Editorial material (Refereed) Published
Abstract [en]

This paper presents and analyzes modulation and power losses of a stacked polyphase bridges converter - a modular topology potentially allowing increased compactness and fault tolerance for automotive drive systems. In particular, an analysis of the impact of modulation on the harmonic content of the dc-link current of the converter is made. Due to the possibility of using higher switching frequency devices, the current ripple of the stacked polyphase bridges converter can be smaller than that of the two-level three-phase converter with the same dclink capacitor. However, higher switching frequency will result in higher switching losses per fundamental period. Therefore, this paper also investigates the reduction in the dc-link ripple current achieved by interleaving the modulation between the different converter submodules. The amount of reduction can be predicted using an analytical model whose results are demonstrated to be in good agreement with results from corresponding simulations and from an experimental setup. Furthermore, based on the experimentally verified analysis, the stacked polyphase bridges converter in a typical automotive drive system is discussed and compared to a conventional two-level three-phase converter.

Place, publisher, year, edition, pages
IEEE, 2016.
Keyword [en]
stacked polyphase bridges converter; dc-link ripple current; modular topology; power losses
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-196727DOI: 10.1109/JESTPE.2016.2621349OAI: oai:DiVA.org:kth-196727DiVA: diva2:1047762
Note

QC 20161206

Available from: 2016-11-18 Created: 2016-11-18 Last updated: 2016-12-06Bibliographically approved
In thesis
1. Integrated Compact Drives for Electric and Hybrid Electric Vehicles
Open this publication in new window or tab >>Integrated Compact Drives for Electric and Hybrid Electric Vehicles
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

To develop more competitive solutions, one of the trends in the development of drive systems for electric and hybrid electric vehicles (EVs/HEVs) is to integrate the power electronic converter and the electric motor. This thesis aims to investigate the performance and the operation of modular converters in integrated motor drive systems for EVs/HEVs.

In the first part, the concept of integrated modular motor drive systems for EVs/HEVs is introduced. Three suitable modular converter topologies, namely, the stacked polyphase bridges (SPB) converter, the parallel-connected polyphase bridges (PPB) converter and the modular high frequency (MHF) converter, are evaluated and compared with conventional electric drives in terms of power losses, energy storage requirements, and semiconductor costs.

In the second part of the thesis, the harmonic content of the dc-link current of the SPB converter is analyzed. By adopting an interleaving modulation the size of the dc-link capacitor can be reduced without increasing the switching frequency, which is beneficial for achieving a compact integrated system. This method allows for around 80% reduction of the dc-link capacitance for vehicle drives, resulting in a significant size reduction of the power converter and improved integration.

Finally, a communication-based distributed control system for the SPB converter is presented. The communication delay arising from the serial communication is inevitable, thus a timing analysis is also presented. It has been found that stability is maintained even when the baud rate of the SPI communication is lower than 1 Mbps, indicating that other communication protocols with lower bandwidths can also be adopted for this topology.

The analytical investigations provided in this thesis are validated by experiments on a four-submodule laboratory prototype. Experimental results verify the correctness of the theoretical analysis, as well as the dynamic performance of the distributed control system.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 123 p.
Series
TRITA-EE, ISSN 1653-5146
Keyword
distributed control, electric vehicle, energy storage capability, integrated motor drive, modular converter, modulation, power losses, stacked polyphase bridges converter, switching frequency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-196732 (URN)978-91-7729-196-1 (ISBN)
Public defence
2016-12-19, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20161121

Available from: 2016-11-21 Created: 2016-11-18 Last updated: 2016-11-21Bibliographically approved

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