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Hultgren, Anders
Publications (9 of 9) Show all publications
Hultgren, A., Bui, S., Linnér, J., Ranstad, P. & Lenells, M. (2013). Fault tolerant high voltage resonant power converter application. In: : . Paper presented at IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, SDEMPED. Valencia: IEEE
Open this publication in new window or tab >>Fault tolerant high voltage resonant power converter application
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2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A high voltage and high power fault tolerant application of a resonant converter is presented. The resonant converter load shows frequent short circuits making the load voltage drop to zero within some us, implying high stress on the main circuit components. A load voltage short circuit fault tolerant system is suggested by including a novel way of augmenting the controller with a load voltage estimator. The estimator can detect load voltage short circuit and will then be a part of a fault tolerant high voltage resonant converter.

Place, publisher, year, edition, pages
Valencia: IEEE, 2013
Keywords
Fault tolerant, load voltage short circuit estimator, resonant converter
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-6750 (URN)10.1109/DEMPED.2013.6645759 (DOI)000396580800071 ()oai:bth.se:forskinfoD6CB88A8AF842354C1257CA60039C4F0 (Local ID)978-1-4799-0025-1 (ISBN)oai:bth.se:forskinfoD6CB88A8AF842354C1257CA60039C4F0 (Archive number)oai:bth.se:forskinfoD6CB88A8AF842354C1257CA60039C4F0 (OAI)
Conference
IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, SDEMPED
Available from: 2014-03-25 Created: 2014-03-25 Last updated: 2018-01-17Bibliographically approved
Hultgren, A., Melin, J. & Ranstad, P. (2011). Limit cycle control of an industrially applied resonant converter modelled as a hybrid system. Paper presented at IEEE International Symposium of Circuits and Systems, ISCAS. Paper presented at IEEE International Symposium of Circuits and Systems, ISCAS. Rio de Janeiro: IEEE
Open this publication in new window or tab >>Limit cycle control of an industrially applied resonant converter modelled as a hybrid system
2011 (English)Conference paper, Published paper (Refereed) Published
Abstract [en]

Limit cycle control of an industrially applied high power, high voltage resonant power converter is modelled as a hybrid system. It is found that the hybrid system with three continuous states and one logic state given a parameter set up and different initial conditions has a rich solution set indicating possible problems in the industrial application. The solution set are one central closed trajectory and two asymmetric types of limit cycles.

Place, publisher, year, edition, pages
Rio de Janeiro: IEEE, 2011
Keywords
Closed trajectory, Continuous state, High voltage, High-power, Initial conditions, Limit cycle, Logic state, Parameter set, Resonant converters, Resonant power converters, Solution set
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-7392 (URN)10.1109/ISCAS.2011.5937963 (DOI)000297265302057 ()oai:bth.se:forskinfoF9FB461549A73B88C1257974004431B5 (Local ID)978-142449473-6 (ISBN)oai:bth.se:forskinfoF9FB461549A73B88C1257974004431B5 (Archive number)oai:bth.se:forskinfoF9FB461549A73B88C1257974004431B5 (OAI)
Conference
IEEE International Symposium of Circuits and Systems, ISCAS
Available from: 2012-09-18 Created: 2011-12-28 Last updated: 2015-06-30Bibliographically approved
Hultgren, A., Melin, J. & Ranstad, P. (2010). Limit Cycles in an Industrially Applied Hybrid System. Paper presented at The 11th International Workshop on Variable structure systems. Paper presented at The 11th International Workshop on Variable structure systems. Mexico city: IEEE
Open this publication in new window or tab >>Limit Cycles in an Industrially Applied Hybrid System
2010 (English)Conference paper, Published paper (Refereed) Published
Alternative title[sv]
Gränscykler i ett industriellt tillämpad hybridsystem
Abstract [en]

An industrially applied LCC power converter is modelled as a hybrid system. It is found that the hybrid system with three continuous states and one logic state given a parameter set up and different initial conditions has among other solutions one central closed trajectory and two types of limit cycles, on the left and the right side. The other solutions are indicated.

Abstract [sv]

En industriellt tillämpad LCC omvandlare är modellerad som ett hybridsystem. Det hybrida systemet modelleras med tre kontinuerliga tillstånd och ett logiskt tillstånd. Givet den industriella parameteruppsättningen och olika differentialvärden har systemet lösningar som bland annat en sluten bana och två gränscykler. Andra lösningar är inikerade.

Place, publisher, year, edition, pages
Mexico city: IEEE, 2010
Keywords
Modelling, hybrid system, automatic control, limit cycle, resonant power converter
National Category
Mathematical Analysis Signal Processing
Identifiers
urn:nbn:se:bth-7736 (URN)oai:bth.se:forskinfoC42689C676973B7AC125778D0037672E (Local ID)978-1-4244-5830-1 (ISBN)oai:bth.se:forskinfoC42689C676973B7AC125778D0037672E (Archive number)oai:bth.se:forskinfoC42689C676973B7AC125778D0037672E (OAI)
Conference
The 11th International Workshop on Variable structure systems
Available from: 2012-09-18 Created: 2010-08-28 Last updated: 2015-06-30Bibliographically approved
Karlsson, M., Holmberg, T., Hultgren, A. & Lenells, M. (2009). A Structural Modeling Flow for Switched Electrical Networks. Paper presented at Darnell's Digital Power Forum. Paper presented at Darnell's Digital Power Forum. Santa Ana, CA
Open this publication in new window or tab >>A Structural Modeling Flow for Switched Electrical Networks
2009 (English)Conference paper, Published paper (Refereed) Published
Alternative title[sv]
En strukturerad modelleringsmetod för switchade elektriska kretsar
Abstract [en]

A structural flow for modeling of switched electrical circuits by means of an example a switched DC/DC converter will be presented. The modeling flow has a minimal amount of hand calculations and is suitable for script implementation in suitable mathematical computer software such as Matlab or similar. Switched Hamiltonian Differential Algebraic Equation models and Differential Equation models are obtained which are suitable for analysis in the time domain. Linear models, which can be transformed to the frequency domain for analysis, are obtained from the Hamiltonian models. The duty cycle will be included in the input vector enabling the full system analysis considering the system transfer functions audio susceptibility, output impedance, and control, i.e., the duty cycle to output voltage.

Abstract [sv]

En metod för modellering av switchade elektriska kretsar presenteras och används för att modellera elektriska kraftomvandlare.

Place, publisher, year, edition, pages
Santa Ana, CA: , 2009
Keywords
Modelling, electrical networks, power converters
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-8020 (URN)oai:bth.se:forskinfoB5705000224D4708C125760E00192E51 (Local ID)oai:bth.se:forskinfoB5705000224D4708C125760E00192E51 (Archive number)oai:bth.se:forskinfoB5705000224D4708C125760E00192E51 (OAI)
Conference
Darnell's Digital Power Forum
Note
Hej Administratör. Denna konferensartiukel är endast reviewad som ett extended abstract. Betraktas den då som "peer reviewed".Available from: 2012-09-18 Created: 2009-08-10 Last updated: 2015-06-30Bibliographically approved
Hultgren, A., Melin, J. & Ranstad, P. (2009). Asymmetric Limit Cycles in an Industrially Applied Controlled Resonant Converter. Paper presented at International Federation of Automatic Control, Conference of Analysis of Hybrid Systems. Paper presented at International Federation of Automatic Control, Conference of Analysis of Hybrid Systems. Zaragoza: Elsevier
Open this publication in new window or tab >>Asymmetric Limit Cycles in an Industrially Applied Controlled Resonant Converter
2009 (English)Conference paper, Published paper (Refereed) Published
Alternative title[sv]
Asymmetriska gränscykler i en industriellt använd reglerad resonant kraftomvandlare.
Abstract [en]

An industrially applied LCC power converter is modelled as a hybrid system. It is found that the hybrid system given a parameter set up and different initial conditions has three different limit cycles, one unstable and two asymmetric stable limit cycles. Effects of the asymmetric limit cycles are considered.

Abstract [sv]

En industriellt använd LCC-kraftomvandlare är modellerad som ett hybrid-system. Det visas att för en given parameteruppsättning och olika begynnelsevillkor har systemet tre olika gränscykler, en stabil och två olika instabila assymmetriska gränscykler. Effekter för den industriella tillämpningen analyseras.

Place, publisher, year, edition, pages
Zaragoza: Elsevier, 2009
Keywords
Modelling, analysis, simulation, control, hybrid, limit cycles, resonant power converters.
National Category
Mathematical Analysis Signal Processing
Identifiers
urn:nbn:se:bth-6269 (URN)oai:bth.se:forskinfo03BFEDA12E09C509C125760E0017A4D1 (Local ID)oai:bth.se:forskinfo03BFEDA12E09C509C125760E0017A4D1 (Archive number)oai:bth.se:forskinfo03BFEDA12E09C509C125760E0017A4D1 (OAI)
Conference
International Federation of Automatic Control, Conference of Analysis of Hybrid Systems
Available from: 2015-06-25 Created: 2009-08-10 Last updated: 2015-06-30Bibliographically approved
Hultgren, A., Kulesza, W., Nilsson, M. & Walther, B. (2009). Integration av matematik och teknik på ingenjörsutbildningar. Paper presented at BTHs högskolepedagogiska konferens. Paper presented at BTHs högskolepedagogiska konferens. Karlskrona: BTH
Open this publication in new window or tab >>Integration av matematik och teknik på ingenjörsutbildningar
2009 (Swedish)Conference paper, Published paper (Refereed) Published
Alternative title[en]
Integration of mathematics and technology in engineering education
Abstract [sv]

I detta bidrag presenterar vi en uppläggning av integrerade kurser i matematik och tillämpningar, vilken använts inom högskoleingenjörsutbildningen vid Högskolan i Kalmar. Kursverksamheten, som bedrivs inom ramen för kurspaketet ingenjörsvetenskap, tillgodoser såväl behovet av att betona matematikens roll som ett generellt och abstrakt verktyg för problemlösning som behovet av att ge studenterna bra baskunskaper i matematik i anslutning till möjliga tillämpningsområden.

Abstract [en]

An possible integration of mathematics and applications within engineering is presented. The integration method has been used at The university of Kalmar. The method is described and experiences are presented.

Place, publisher, year, edition, pages
Karlskrona: BTH, 2009
Keywords
matematik på ingenjörsutbildning, integration av matematik och tillämpning.
National Category
Pedagogy
Identifiers
urn:nbn:se:bth-6268 (URN)oai:bth.se:forskinfo30B9153D3B39105BC125760E001F1329 (Local ID)oai:bth.se:forskinfo30B9153D3B39105BC125760E001F1329 (Archive number)oai:bth.se:forskinfo30B9153D3B39105BC125760E001F1329 (OAI)
Conference
BTHs högskolepedagogiska konferens
Available from: 2015-06-25 Created: 2009-08-10 Last updated: 2015-06-30Bibliographically approved
Hultgren, A., Nilsson, M., Kulesza, W. & Walther, B. (2008). Integration av matematik och teknik på ingenjörsutbildningar. Paper presented at Utvecklingskonferensen 2008. Paper presented at Utvecklingskonferensen 2008. Stockholm, Sweden: Nätverket för ingenjörsutbildning
Open this publication in new window or tab >>Integration av matematik och teknik på ingenjörsutbildningar
2008 (Swedish)Conference paper, Published paper (Other academic) Published
Alternative title[en]
Integration av matematik och teknik på ingenjörsutbildningar
Abstract [sv]

I detta bidrag presenterar vi en uppläggning av integrerade kurser i matematik och tillämpningar, vilken använts inom högskoleingenjörsutbildningen vid Högskolan i Kalmar. Kursverksamheten, som bedrivs inom ramen för kurspaketet ingenjörsvetenskap, tillgodoser såväl behovet av att betona matematikens roll som ett generellt och abstrakt verktyg för problemlösning som behovet av att ge studenterna bra baskunskaper i matematik i anslutning till möjliga tillämpningsområden.

Place, publisher, year, edition, pages
Stockholm, Sweden: Nätverket för ingenjörsutbildning, 2008
Keywords
Matematikundervisning, integration av matematik och teknik, ingenjörsutbildning
National Category
Pedagogy
Identifiers
urn:nbn:se:bth-8257 (URN)oai:bth.se:forskinfo43DF87654F7C6D89C12575390049672B (Local ID)oai:bth.se:forskinfo43DF87654F7C6D89C12575390049672B (Archive number)oai:bth.se:forskinfo43DF87654F7C6D89C12575390049672B (OAI)
Conference
Utvecklingskonferensen 2008
Note
http://kth.se/ingenjorsutbildningarna/Available from: 2012-09-18 Created: 2009-01-09 Last updated: 2015-06-30Bibliographically approved
Melin, J., Hultgren, A. & Lindström, T. (2008). Two types of limit cycles of a resonant converter modelled by a three-dimensional system. Nonlinear Analysis: Hybrid Systems, 2(4), 1275-1286
Open this publication in new window or tab >>Two types of limit cycles of a resonant converter modelled by a three-dimensional system
2008 (English)In: Nonlinear Analysis: Hybrid Systems, ISSN 1751-570X, E-ISSN 1878-7460, Vol. 2, no 4, p. 1275-1286Article in journal (Refereed) Published
Alternative title[sv]
Två typer av gränscykler i en resonant LCC-omvandlare
Abstract [en]

In this paper, the long-run dynamics of a controlled resonant converter, modelled as a piecewise system, is studied. The modelling of the resonant converter can be done using various approximations and the long-run dynamics of the two dimensional cases were earlier analysed. In this paper, we discuss results that can be extended to the three dimensional case. It seems that limit cycles describe the longrun dynamics in important situations in the three dimensional case, too. Our objective is to relate the limit cycles found previously in the two-dimensional case to those found now in the three dimensional approximation.

Abstract [sv]

Analys av dynamiken i en reglerad resonant omvandlare, modellerad som ett tredimensionellt styckvis linjärt system. Analysen bygger på metoder som använts för en tvådimensionell modell av omvandlaren. Två typer av gränscykler presenteras. Analysen ger underlag för bedömning av regulatorkonstruktion för en industriell tillämpning.

Place, publisher, year, edition, pages
Elsevier, 2008
Keywords
Control of resonant converter, Piecewise linear system, Plane Subspace, Limit cycle, Projection
National Category
Mathematical Analysis Signal Processing
Identifiers
urn:nbn:se:bth-8258 (URN)10.1016/j.nahs.2008.09.020 (DOI)oai:bth.se:forskinfo8166DE3274540D00C125753900484A3C (Local ID)oai:bth.se:forskinfo8166DE3274540D00C125753900484A3C (Archive number)oai:bth.se:forskinfo8166DE3274540D00C125753900484A3C (OAI)
Note
http://authors.elsevier.com/offprints/NAHS151/50484462e8e8756a21e6cd1011b96bcbAvailable from: 2012-09-18 Created: 2009-01-09 Last updated: 2017-12-04Bibliographically approved
Bosch, J., Lundberg, C. & Hultgren, A. (1996). Multiple Object Interfaces in Object-Oriented Control Systems. Paper presented at Proceedings of the IEEE International Conference on Engineering of Complex Computer Systems, ICECCS Proceedings of the 1996 2nd IEEE International Conference on Engineering of Complex Computer Systems Oct 21-25 1996. Paper presented at Proceedings of the IEEE International Conference on Engineering of Complex Computer Systems, ICECCS Proceedings of the 1996 2nd IEEE International Conference on Engineering of Complex Computer Systems Oct 21-25 1996. IEEE Comput. Soc. Press
Open this publication in new window or tab >>Multiple Object Interfaces in Object-Oriented Control Systems
1996 (English)Conference paper, Published paper (Refereed) Published
Abstract [en]

When modelling complex computer systems, four primary modelling techniques are available to the software engineer, i.e. abstraction, composition, functional decomposition and multiple client interfaces (views). Abstraction and composition can directly be expressed in traditional object-oriented models and functional decomposition can often be expressed using subsystems. However, traditional object models provide no expressiveness for multiple client interfaces. This forces designers to either model all different views on a conceptual object as a large, complex implementation object or to model each view as an object and relate the different view objects. Both approaches suffer from problems of complexity, maintainability and reusability. As a solution, we propose the layered object model that allows for the expressive, flexible and extensible definition of multiple client interfaces. To illustrate the problems associated with views and our proposed solution, the domain of industrial control systems is used.

Place, publisher, year, edition, pages
IEEE Comput. Soc. Press, 1996
Keywords
Control systems, Large scale systems, Computer aided software engineering, Object oriented programming, Computer simulation, Interactive computer systems, User interfaces
National Category
Software Engineering Computer Sciences
Identifiers
urn:nbn:se:bth-10075 (URN)A1996BG62Z00052 ()oai:bth.se:forskinfo46B7E45AD08481ABC12568A3002CAB1F (Local ID)0-8186-7614-0 (ISBN)oai:bth.se:forskinfo46B7E45AD08481ABC12568A3002CAB1F (Archive number)oai:bth.se:forskinfo46B7E45AD08481ABC12568A3002CAB1F (OAI)
Conference
Proceedings of the IEEE International Conference on Engineering of Complex Computer Systems, ICECCS Proceedings of the 1996 2nd IEEE International Conference on Engineering of Complex Computer Systems Oct 21-25 1996
Note
Compressed version published.Available from: 2012-09-18 Created: 2000-03-15 Last updated: 2018-01-11Bibliographically approved
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