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Comparison and Evaluation of Modular Integrated Electric Drives for Automotive Traction Applications
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.ORCID iD: 0000-0002-4534-921X
KTH, School of Electrical Engineering (EES), Electric power and energy systems.ORCID iD: 0000-0002-6283-7661
KTH, School of Electrical Engineering (EES), Electric power and energy systems. (power electronics)ORCID iD: 0000-0002-8565-4753
(English)In: IEEE Transactions on Transportation Electrification, ISSN 2332-7782Article in journal (Refereed) Submitted
Abstract [en]

In order to increase the competitiveness of the integrated motor drives (IMDs), alternative topologies have been developed for electric and hybrid electric vehicles. Within this framework, the integrated modular motor drive (IMMD) concept has been proposed, aiming to make the system more compact and fault-tolerant. Potential converter topologies for an IMMD are reviewed in this paper, with particular focus on the stacked polyphase bridges converter, the parallel-connected polyphase bridges converter and the modular high frequency converter. The machine topologies that are the best candidates to be used in such drive systems are also presented. Based on the FreedomCar 2020 specifications, a comparative evaluation of the studied topologies is presented and discussed in terms of machine design, power losses, energy storage requirements, and cell redundancy. The conventional two-level three-phase drive system is utilized as the reference. Finally, predicted costs of the studied drive systems are compared for both fault-tolerant designs and non-fault tolerant designs.

Keyword [en]
Electric vehicle, integrated motor drive, modular interior permanent magnet.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-196729OAI: oai:DiVA.org:kth-196729DiVA: diva2:1047777
Note

QC 20161121

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