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Design, Construction and Evaluation of a StackedPolyphase Bridges Converter for Integrated ElectricDrive Systems in Automotive ApplicationsMOJGAN NIKOUIEDoctoral ThesisStockholm, Sweden
KTH, School of Electrical Engineering and Computer Science (EECS). (Electric Power and Energy Systems)
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents a new concept for integration of the electricdrive system, specifically for electric and hybrid electric vehicle applications.The topology introduces an integration between the so-calledstacked polyphase bridges (SPB) converter and fractional-slot concentratedpermanent-magnet synchronous machine. The SPB converter iscomprised of an arbitrary number of submodules that are connected inseries to a dc-source voltage. A very compact integrated electric drivesystem is gained by the integration. Several advantages are potentiallygained from the concept, such as considerably shortening the powercables interconnecting the converter with the machine and as well asreduction in terms of electromagnetic interference, weight, and size.The principal focus of the thesis is on the design, construction, andcontrol of the SPB converter. Three different generations for the SPBconverter, all with four submodules, have been developed within theproject. In the first two generations, a submodule consists of a two-layerprinted circuit board (PCB) including both power and control circuits,whereas in the third generation, each submodule has separate powerand control boards. The power circuit is a conventional two-level threephaseconverter. In the third generation, the power PCBs can handlean rms current of 100 A and a dc-link voltage of 100 V.Along with the design of the converter, control algorithms have beendeveloped. A conventional proportional–integral (PI) current controlleris implemented on the microprocessor of each control board, on whichouter control loops are added. One important contribution concerningthe control is the stability analysis and balancing controller designresulting thereof. Since the submodules are series connected to the dcsourcevoltage, it is essential to ensure that the total voltage is sharedequally among the submodules.Secondly, a study of the SPB converter under fault is made. It is assumedthat one submodule is facing a short- or open-circuited powertransistor and the behavior of the converter is studied. A proposal fora safe way of short circuiting the faulty submodule is presented.Finally, torque ripple minimization is discussed. It is shown that usingan estimator for the flux linkage harmonics in the machine as well asadding a resonant part to the PI current controller can be an efficientmethod to suppress the ripple.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. , p. 80
Series
TRITA-EECS-AVL ; 2019:34
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-249383ISBN: 978-91-7873-153-4 (print)OAI: oai:DiVA.org:kth-249383DiVA, id: diva2:1304267
Public defence
2019-05-07, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20190412

Available from: 2019-04-12 Created: 2019-04-11 Last updated: 2019-04-12Bibliographically approved
List of papers
1. DC-link and machine design considerationsfor resonant controllers adopted in automotive PMSM drives
Open this publication in new window or tab >>DC-link and machine design considerationsfor resonant controllers adopted in automotive PMSM drives
(English)In: Article in journal (Refereed) Submitted
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-249382 (URN)
Note

QC 20120412

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-04-12Bibliographically approved
2. Operation Under Fault Conditions of the Stacked Polyphase Bridges Converter
Open this publication in new window or tab >>Operation Under Fault Conditions of the Stacked Polyphase Bridges Converter
2016 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The stacked polyphase bridges converter consists of several submodules that, on the input dc side, all are connected in series. Whereas controller designs presented in previous studies have been found promising for realizing equal voltage sharing between submodules, the survival and stability under fault conditions have not been studied. This paper presents a control strategy that enables survival of the converter after the occurrence of a sudden short circuit of a single transistor switch. The results are verified by simulations.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2016
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-193888 (URN)10.1109/IECON.2016.7793176 (DOI)000399031202080 ()2-s2.0-85010046684 (Scopus ID)9781509034741 (ISBN)
Conference
The 42nd Annual Conference of the IEEE Industrial Electronics Society (IECON 2016)
Note

QC 20161027

Available from: 2016-10-11 Created: 2016-10-11 Last updated: 2019-04-11Bibliographically approved
3. A highly integrated electric drive system for tomorrow's EVs and HEVs
Open this publication in new window or tab >>A highly integrated electric drive system for tomorrow's EVs and HEVs
2018 (English)In: Proceedings - 2017 IEEE Southern Power Electronics Conference, SPEC 2017, Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 1-5Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an ultra-compact integrated electric drive prototype. The prototype illustrates the integration of a fractional slot concentrated winding (FSCW) electric motor, a stacked polyphase bridges (SPB) converter, the control boards, and the water cooling plates into a common housing. This integrated prototype offers a high potential of compactness and cost reduction for electric and hybrid electric vehicles.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-238250 (URN)10.1109/SPEC.2017.8333555 (DOI)2-s2.0-85049217902 (Scopus ID)9781509064250 (ISBN)
Conference
2017 IEEE Southern Power Electronics Conference, SPEC 2017, Hotel Enjoy Puerto VarasPuerto Varas, Chile, 4 December 2017 through 7 December 2017
Note

QC 20181120

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2019-04-11Bibliographically approved
4. Torque-Ripple Minimization for Permanent-Magnet Synchronous Motors Based on Harmonic Flux Estimation
Open this publication in new window or tab >>Torque-Ripple Minimization for Permanent-Magnet Synchronous Motors Based on Harmonic Flux Estimation
2018 (English)In: 2018 20TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'18 ECCE EUROPE), IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a control algorithm to reduce the torque ripple in permanent-magnet synchronous motors. This control algorithm is based on the on-line estimation of harmonic flux linkage. Together with the on-line estimation of the flux linkage, a proportional-integral-resonant controller is introduced to suppress the torque ripple.

Place, publisher, year, edition, pages
IEEE, 2018
Series
European Conference on Power Electronics and Applications, ISSN 2325-0313
Keywords
Flux estimation, PIR current controller, Torque ripple
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-240052 (URN)000450299300050 ()2-s2.0-85057033340 (Scopus ID)978-9-0758-1528-3 (ISBN)
Conference
20th European Conference on Power Electronics and Applications (EPE ECCE Europe), SEP 17-21, 2018, Riga, LATVIA
Note

QC 20181210

Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-04-11Bibliographically approved
5. DC-link stability analysis and controller design for the stacked polyphase bridges converter
Open this publication in new window or tab >>DC-link stability analysis and controller design for the stacked polyphase bridges converter
Show others...
2017 (English)In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 32, no 2, p. 1666-1674, article id 7451258Article in journal (Refereed) Published
Abstract [en]

The stacked polyphase bridges (SPB) converter consists of several submodules that all are connected in series to a voltage source. The total dc-link voltage should split in a balanced way among the submodules. This does not always occur inherently. This paper presents an analysis of the capacitor voltage stability for the SPB converter. From the analysis, criteria for stability are derived and three alternatives of a suitable balancing controller are designed. The proposed controller alternatives and their associated stability properties are verified on an experimental setup and by simulation.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Keywords
Balancing control, dc-link stability, integrated electric drive, modular converter.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-185042 (URN)10.1109/TPEL.2016.2553129 (DOI)000388867300066 ()2-s2.0-84999273776 (Scopus ID)
Note

QC 20170119

Available from: 2016-04-10 Created: 2016-04-10 Last updated: 2019-04-11Bibliographically approved
6. Analysis of the dc-link stability for the stacked polyphase bridges converter
Open this publication in new window or tab >>Analysis of the dc-link stability for the stacked polyphase bridges converter
Show others...
2015 (English)In: 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe), IEEE , 2015Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an analysis of the capacitor voltage stability for a stacked polyphase bridges (SPB)

type converter. The SPB converter comprises of several submodules which are connected in series.

Therefore, stability of the dc-link voltage is very important to investigate. From the analysis, a corresponding

controller and an analytical expression for stability are derived. The proposed controller and

the associated stability condition are verified in a simulation environment and on a small experimental

setup.

Place, publisher, year, edition, pages
IEEE, 2015
Keywords
<<DC-link stability>>, <<integrated electric drive>>, <<stacked polyphase bridges converter>>.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-173818 (URN)10.1109/EPE.2015.7309303 (DOI)000377101802035 ()2-s2.0-84965027286 (Scopus ID)
Conference
ECCE Euroup EPE 2015
Note

QC 20151218

Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2019-04-11Bibliographically approved

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