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Nikouei Harnefors, MojganORCID iD iconorcid.org/0000-0002-0333-9128
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Publications (7 of 7) Show all publications
Wallmark, O. & Nikouei Harnefors, M. (2020). Dc-link and machine design considerations for resonant controllers adopted in automotive PMSM drives. IET ELECTRICAL SYSTEMS IN TRANSPORTATION, 10(1), 75-80
Open this publication in new window or tab >>Dc-link and machine design considerations for resonant controllers adopted in automotive PMSM drives
2020 (English)In: IET ELECTRICAL SYSTEMS IN TRANSPORTATION, ISSN 2042-9738, Vol. 10, no 1, p. 75-80Article in journal (Refereed) Published
Abstract [en]

This study presents an analysis of the harmonic content on the dc-link (battery) side in electric drives with permanent-magnet synchronous machines (PMSMs) adopting fractional-slot concentrated windings (FSCWs) which can have a significant harmonic content. An analytical expression for predicting the ripple content in the dc-link (battery) current utilising data from a two-dimensional finite element method (2D-FEM) based model is presented and found to be in good agreement with corresponding experimental results. The FEM model is also used to demonstrate that the resulting harmonic content in the phase currents when operating at speeds well above the bandwidth of a conventional proportional + integral type controller can result in a substantial increase in magnet losses. Finally, a previously reported, experimentally evaluated model of an automotive traction battery and the associated battery cable is combined with an implemented model of the FSCW-PMSM (utilising data from the 2D-FEM model), converter and control to predict the resulting harmonic content in the battery current. The presented methods can be utilised when analysing the impact of harmonics on both the ac and dc sides of an automotive electric drive system.

Place, publisher, year, edition, pages
INST ENGINEERING TECHNOLOGY-IET, 2020
Keywords
traction, machine windings, electric drives, eddy current losses, synchronous motor drives, permanent magnet machines, synchronous motors, automotive electrics, finite element analysis, permanent magnet motors, synchronous machines, dc-link current utilising data, two-dimensional finite element method, corresponding experimental results, resulting harmonic content, phase currents, conventional proportional + integral type controller, magnet losses, automotive traction battery, associated battery cable, 2D-FEM model, battery current, dc sides, automotive electric drive system, machine design considerations, resonant controllers, automotive PMSM drives, dc-link side, permanent-magnet synchronous machines, fractional-slot concentrated windings, significant harmonic content, analytical expression, ripple content
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-270882 (URN)10.1049/iet-est.2019.0007 (DOI)000514870300009 ()2-s2.0-85079444275 (Scopus ID)
Note

QC 20200325

Available from: 2020-03-25 Created: 2020-03-25 Last updated: 2020-03-25Bibliographically approved
Nikouie Harnefors, M., Wallmark, O., Jin, L., Harnefors, L. & Nee, H.-P. (2017). DC-link stability analysis and controller design for the stacked polyphase bridges converter. IEEE transactions on power electronics, 32(2), 1666-1674, Article ID 7451258.
Open this publication in new window or tab >>DC-link stability analysis and controller design for the stacked polyphase bridges converter
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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
Nikouei Harnefors, M., Wallmark, O., Harnefors, L. & Nee, H.-P. (2016). Operation Under Fault Conditions of the Stacked Polyphase Bridges Converter. In: : . Paper presented at The 42nd Annual Conference of the IEEE Industrial Electronics Society (IECON 2016). IEEE conference proceedings
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
Nikouie Harnefors, M., Jin, L., Harnefors, L., Wallmark, O., Leksell, M. & Norrga, S. (2015). Analysis of the dc-link stability for the stacked polyphase bridges converter. In: 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe): . Paper presented at ECCE Euroup EPE 2015. IEEE
Open this publication in new window or tab >>Analysis of the dc-link stability for the stacked polyphase bridges converter
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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
Jin, L., Norrga, S., Wallmark, O. & Nikouei Harnefors, M. (2014). Control and modulation of the stacked polyphase bridges inverter. In: IEEE Energy Conversion Congress and Exposition: . Paper presented at 6th Annual IEEE Energy Conversion Congress and Exposition (ECCE’14), Pittsburgh, USA, September 14-18 2014 (pp. 3023-3029). IEEE
Open this publication in new window or tab >>Control and modulation of the stacked polyphase bridges inverter
2014 (English)In: IEEE Energy Conversion Congress and Exposition, IEEE, 2014, p. 3023-3029Conference paper, Published paper (Refereed)
Abstract [en]

In order to meet the requirements of future electric vehicle (EV) drive systems, new converter topologies are required. The stacked polyphase bridges (SPB) inverter is a new topology which is well adapted to the needs for future EVs. In addition to low power losses, the SPB inverter also has fault tolerance ability and good dynamic behavior. This paper presents a further analysis of the control and modulation concept of the SPB inverter. Simulation results are used to verify the analysis conclusions.

Place, publisher, year, edition, pages
IEEE, 2014
Keywords
Inverters;harmonic analysis;capacitors; modulation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
Identifiers
urn:nbn:se:kth:diva-166468 (URN)10.1109/ECCE.2014.6953811 (DOI)000411444300431 ()2-s2.0-84934300463 (Scopus ID)978-1-4799-5776-7 (ISBN)
Conference
6th Annual IEEE Energy Conversion Congress and Exposition (ECCE’14), Pittsburgh, USA, September 14-18 2014
Funder
StandUp
Note

QC 20150520

Available from: 2015-05-11 Created: 2015-05-11 Last updated: 2020-02-18Bibliographically approved
Zhang, H., Wallmark, O., Leksell, M., Norrga, S., Harnefors, M. & Jin, L. (2014). Machine design considerations for an MHF/SPB-converter based electric drive. In: 2014 The 40th Annual Conference of the IEEE Industrial Electronics Society, IECON 2014: . Paper presented at 2014 The 40th Annual Conference of the IEEE Industrial Electronics Society, IECON 2014, Dallas, USA, 29 OCT-1 November 2014 (pp. 3849-3854).
Open this publication in new window or tab >>Machine design considerations for an MHF/SPB-converter based electric drive
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2014 (English)In: 2014 The 40th Annual Conference of the IEEE Industrial Electronics Society, IECON 2014, 2014, p. 3849-3854Conference paper, Published paper (Refereed)
Abstract [en]

This paper identifies suitable phase/slot/pole combinationsfor fractional-slot concentrated winding (FSCW)permanent-magnet machines when forming an integrated electricdrive together with a modular high frequency (MHF) converteror a stacked polyphase bridge (SPB) converter.

Keywords
Electric machines, permanent magnet, fractional-slot, winding factor, integrated
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-166564 (URN)10.1109/IECON.2014.7049074 (DOI)2-s2.0-84983197170 (Scopus ID)
Conference
2014 The 40th Annual Conference of the IEEE Industrial Electronics Society, IECON 2014, Dallas, USA, 29 OCT-1 November 2014
Note

QC 20150520

Available from: 2015-05-11 Created: 2015-05-11 Last updated: 2020-03-05Bibliographically approved
Wallmark, O. & Nikouei Harnefors, M. 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
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0333-9128

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