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Publications (10 of 38) Show all publications
Alahakoon, S., Leksell, M. & Östlund, S. (2019). Emerging Energy Storage Solutions for Transportation Electrification - A view. International Journal of Engineering and Technology Innovation, 9(2), 75-90
Open this publication in new window or tab >>Emerging Energy Storage Solutions for Transportation Electrification - A view
2019 (English)In: International Journal of Engineering and Technology Innovation, ISSN 2223-5329, E-ISSN 2226-809X, Vol. 9, no 2, p. 75-90Article, review/survey (Refereed) Published
Abstract [en]

Energy storages have caught the attention of transportation community r the past several years. Rsecent developments in hybrid and plug-in ectric vehicles together with novel concepts in transportation such as ectric highways are the reasons for raising the role of energy orages in transportation to such a significant level. Performance mands for energy storage solutions vary significantly from one ansportation application to the other, making it difficult for the ientific community to converge to a single energy storage solution at caters all. This paper reviews the key performance demands of the jor transportation applications. It also investigates the aracteristics of emerging energy storage solutions and assess their itability for those reviewed transportation applications.

Place, publisher, year, edition, pages
Taiwan Assoc Engineering & Technology Innovation, 2019
Keywords
batteries, capacitors, chemistry, energy management, energy storage, flywheels
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-248316 (URN)000462007500001 ()
Note

QC 20190405

Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-05Bibliographically 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
Soares, R., Bessman, A., Wallmark, O., Leksell, M., Behm, M. & Svens, P. (2015). Design Aspects of an Experimental Setup for Investigating Current Ripple Effects in Lithium-ion Battery Cells. In: Power Electronics and Applications (EPE'15 ECCE-Europe), 2015 17th European Conference on: . Paper presented at Power Electronics and Applications (EPE'15 ECCE-Europe), 8-10 Sept. 2015, Geneva, (pp. 1-8). IEEE conference proceedings
Open this publication in new window or tab >>Design Aspects of an Experimental Setup for Investigating Current Ripple Effects in Lithium-ion Battery Cells
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2015 (English)In: Power Electronics and Applications (EPE'15 ECCE-Europe), 2015 17th European Conference on, IEEE conference proceedings, 2015, p. 1-8Conference paper, Published paper (Refereed)
Abstract [en]

This paper describes an experimental setup for investigating the effects of current ripple on lithium-ion battery cells. The experimental setup is designed so that twelve li-ion cells can be simultaneously tested in a controlled environment. The experimental setup allows for a wide range of current ripple in terms of frequency and amplitude. Additionally, the quantification of the current ripple effects such as the aging of li-ion cells implies that a precise measurement system has to be designed which also are discussed in the paper.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-178001 (URN)10.1109/EPE.2015.7309112 (DOI)000377101800063 ()2-s2.0-84965074464 (Scopus ID)
Conference
Power Electronics and Applications (EPE'15 ECCE-Europe), 8-10 Sept. 2015, Geneva,
Funder
Swedish Energy AgencyStandUp
Note

QC 20160216

Available from: 2015-12-01 Created: 2015-12-01 Last updated: 2019-05-17Bibliographically approved
Alahakoon, S. & Leksell, M. (2015). Emerging energy storage solutions for transportation - A review: An insight into road, rail, sea and air transportation applications. In: Electrical Systems for Aircraft, Railway and Ship Propulsion, ESARS: . Paper presented at International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles, ESARS 2015, 3 March 2015 through 5 March 2015. IEEE
Open this publication in new window or tab >>Emerging energy storage solutions for transportation - A review: An insight into road, rail, sea and air transportation applications
2015 (English)In: Electrical Systems for Aircraft, Railway and Ship Propulsion, ESARS, IEEE , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Increasing usage of hybrid electric vehicles, plug-in electric vehicles and emerging new concepts in transportation such as electric highways have raised the significant role of energy storage solutions for transportation to its highest level. It is impossible to specify a single energy storage solution that can satisfactorily fulfill the varying performance demands of various applications in transportation. This paper will identify some of the most demanded performance requirements from some of the key applications in transportation and assess the suitability of emerging energy storage solutions against those.

Place, publisher, year, edition, pages
IEEE, 2015
Keywords
battery technology, cycle efficiency, energy density, energy storage, power density, technology comparison, Air transportation, Fighter aircraft, Hybrid vehicles, Plug-in hybrid vehicles, Propulsion, Railroads, Rails, Roads and streets, Ship propulsion, Ships, Vehicles, Power densities, Transportation
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-181547 (URN)10.1109/ESARS.2015.7101490 (DOI)000380445800076 ()2-s2.0-84946206710 (Scopus ID)9781479974009 (ISBN)
External cooperation:
Conference
International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles, ESARS 2015, 3 March 2015 through 5 March 2015
Note

QC 20160202

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-09-05Bibliographically approved
Bessman, A., Soares, R. C., Behm, M., Lindbergh, G., Wallmark, O., Leksell, M. & Svens, P. (2015). Investigating the aging effect of current ripple on lithium-ion cells. In: ECS Transactions: . Paper presented at Conference of Symposium on Joint General Session: Batteries and Energy Storage -and- Fuel Cells, Electrolytes, and Energy Conversion - 228th ECS Meeting ; Conference Date: 11 October 2015 Through 15 October 2015 (pp. 101-106). Electrochemical Society, 69(18)
Open this publication in new window or tab >>Investigating the aging effect of current ripple on lithium-ion cells
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2015 (English)In: ECS Transactions, Electrochemical Society, 2015, Vol. 69, no 18, p. 101-106Conference paper, Published paper (Refereed)
Abstract [en]

We have built an experimental setup which exposes twelve cells to a well-defined ripple current. It consists of a system for cycling high capacity cells in parallel with a triangular current waveform superimposed on top of the direct current. The frequency of the waveform is variable up to 50 Hz, and the sum of the DC and AC components can have a magnitude of -40 A to 40 A. Current is measured over a 500 μω shunt resistor. The voltage and current of each cell is read simultaneously at a sample rate up to 4 MS/s, allowing for precise impedance measurements even for high frequency harmonics. The cells are cycled at 40 °C. The experiment has been designed to eliminate indirect effects of the AC harmonics as far as possible. This system is being used to test whether or not AC harmonics affect Li-ion aging.

Place, publisher, year, edition, pages
Electrochemical Society, 2015
Series
ECS Transactions, ISSN 1938-5862
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-187428 (URN)10.1149/06918.0101ecst (DOI)2-s2.0-84959329828 (Scopus ID)978-160768539-5 (ISBN)
Conference
Conference of Symposium on Joint General Session: Batteries and Energy Storage -and- Fuel Cells, Electrolytes, and Energy Conversion - 228th ECS Meeting ; Conference Date: 11 October 2015 Through 15 October 2015
Note

QC 20160523

Available from: 2016-05-23 Created: 2016-05-23 Last updated: 2016-05-23Bibliographically approved
Nategh, S., Krings, A., Wallmark, O. & Leksell, M. (2014). Evaluation of Impregnation Materials for Thermal Management of Liquid-Cooled Electric Machines. IEEE transactions on industrial electronics (1982. Print), 61(11), 5956-5965
Open this publication in new window or tab >>Evaluation of Impregnation Materials for Thermal Management of Liquid-Cooled Electric Machines
2014 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 61, no 11, p. 5956-5965Article in journal (Refereed) Published
Abstract [en]

In this paper, the thermal impact of using different impregnation materials on high-performance liquid-cooled electric machines is studied. In this regard, varnish, Epoxylite, and a silicone-based thermally conductive material are considered. To study thermal effects of using different impregnation materials in theory, an advanced lumped-parameter thermal model of the studied electric machines is developed. In addition to the simulation studies, three identical induction machines using the aforementioned materials are manufactured and evaluated. Experimental tests are carried out at a wide range of current magnitudes and cooling conditions. A good agreement between the temperature measurements and corresponding simulation results is observed. It is demonstrated that using innovative thermally conductive materials in the stator slots and the end winding bodies of liquid-cooled electric machines results in a significant reduction in the winding hot spot temperature. Additionally, the influence of the critical parameters on the impregnation material performance, e. g., impregnation goodness and slot fill factor, is studied.

Keywords
Computational fluid dynamics, direct oil cooling, Epoxylite, hybrid electric vehicle (HEV), impregnation material, induction machines, lumped parameter (LP) thermal model, silicone-based thermally conductive material (SbTCM), vacuum impregnation, varnish
National Category
Control Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-122841 (URN)10.1109/TIE.2014.2308151 (DOI)000337123000016 ()2-s2.0-84902340101 (Scopus ID)
Funder
StandUpSwedish Energy Agency
Note

Updated from Submitted to Published. QC 20140715

Available from: 2013-05-28 Created: 2013-05-28 Last updated: 2017-12-06Bibliographically 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)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: 2017-05-30Bibliographically approved
Zhao, S., Lasson, A., Wallmark, O. & Leksell, M. (2014). Off-Vehicle Evaluation of Active Oscillation Damping Schemes. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2(2), 264-271
Open this publication in new window or tab >>Off-Vehicle Evaluation of Active Oscillation Damping Schemes
2014 (English)In: IEEE Journal of Emerging and Selected Topics in Power Electronics, ISSN 2168-6777, Vol. 2, no 2, p. 264-271Article in journal (Refereed) Published
Abstract [en]

Torsional drivetrain oscillations are a well-known problem in electrical or hybrid electric drivetrains and may greatly influence the driving comfort. An experimental testing setup that can be used to design and evaluate active oscillation damping schemes is proposed in this paper. Instead of an in-vehicle test, the drivetrain transmission is emulated from mathematic models, executed by a servo drive which is connected to the physical electrical drive system. The proposed setup functions as a hardware-in-the-loop simulator and can be easily adjusted to simulate any drive trains without additional cost.

Keywords
Active oscillation damping, drivetrain oscillation, electric drive, emulation, hybrid electric vehicles (HEVs)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-166457 (URN)10.1109/JESTPE.2013.2291962 (DOI)2-s2.0-84959459475 (Scopus ID)
Funder
StandUp
Note

QC 20150520

Available from: 2015-05-11 Created: 2015-05-11 Last updated: 2015-05-20Bibliographically approved
Zhang, H., Wallmark, O. & Leksell, M. (2014). On fault tolerance for IPM-FSCW machines adopting a modular converter. In: 2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014: . Paper presented at 2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014; Hangzhou; China; 22 October 2014 through 25 October 2014 (pp. 1633-1638).
Open this publication in new window or tab >>On fault tolerance for IPM-FSCW machines adopting a modular converter
2014 (English)In: 2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014, 2014, p. 1633-1638Conference paper, Published paper (Refereed)
Abstract [en]

This paper investigates the fault-tolerant capability of a number of 30 kW permanent magnet (PM) machines with fractional-slot concentrated windings (FSCWs) when connected to two types of modular type converters recently proposed in the literature. Due to the strong PM rotor magnetization when using NdFeB-type magnets, the resulting short-circuit currents during a converter submodule short-circuit was found to be larger than the rated current which, potentially, may cause the machine to overheat. Reducing the PM rotor magnetization will reduce the short-circuit current but also affect the constant power speed range (CPSR). The results further highlight the importance of a tailored design specification when designing FSCW PM machines in automotive applications.

Keywords
Fault-tolerant, fractional-slot, integrated, modular converter, permanent magnet machines, short-circuit currents
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-166466 (URN)10.1109/IAS.2007.205 (DOI)2-s2.0-84922793803 (Scopus ID)978-1-4244-1260-0 (ISBN)978-1-47995161-1 (ISBN)
Conference
2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014; Hangzhou; China; 22 October 2014 through 25 October 2014
Funder
StandUp
Note

QC 20150511

Available from: 2015-05-11 Created: 2015-05-11 Last updated: 2015-05-11Bibliographically approved
Zhao, S., Wallmark, O. & Leksell, M. (2013). Low-Speed Sensorless Control With Reduced Copper Losses for Saturated PMSynRel Machines. IEEE transactions on energy conversion, 28(4), 841-848
Open this publication in new window or tab >>Low-Speed Sensorless Control With Reduced Copper Losses for Saturated PMSynRel Machines
2013 (English)In: IEEE transactions on energy conversion, ISSN 0885-8969, E-ISSN 1558-0059, Vol. 28, no 4, p. 841-848Article in journal (Refereed) Published
Abstract [en]

Permanent-magnet-assisted synchronous reluctance (PMSynRel) machines are generally well suited for sensorless operation at all speeds since the rotor topology possesses a magnetic saliency. However, magnetic saturation can result in a vanishing differential saliency which renders sensorless control at certain operating points difficult (or even impossible) at low speed. In this paper, an optimization procedure, based on results from finite-element (FEM)-based simulations, is proposed. As output, current reference trajectories are obtained in which copper losses are kept at minimum, while the capability for sensorless control is still maintained. The results from the FEM-based simulations are in good agreement with the corresponding experimental results. For the experimental prototype in consideration, the torque limit when operating sensorless at low speed is increased substantially from below 45% to around 95% of its rated value with only slightly increased copper losses. Additionally, the impact of position-dependent harmonics on the magnetic cross saturation (affecting the steady-state position estimation error) is found to be substantial. This highlights that this spatial variation should be taken into consideration for accurate prediction of performance during sensorless operation even if the winding of the machine is of the conventional distributed type.

Keywords
Electric drive, magnetic saturation, permanentmagnet-assisted synchronous reluctance machine (PMSynRel), p osition estimation, sensorless control, signal injection
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Engineering
Identifiers
urn:nbn:se:kth:diva-126089 (URN)10.1109/TEC.2013.2279303 (DOI)000327642800006 ()2-s2.0-84889101225 (Scopus ID)
Funder
StandUp
Note

QC 20131025

Available from: 2013-08-19 Created: 2013-08-19 Last updated: 2017-12-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0744-2552

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