LAPSE:2022.0015
Published Article
LAPSE:2022.0015
Investigation of Electrochemical Processes in Solid Oxide Fuel Cells by Modified Levenberg−Marquardt Algorithm: A New Automatic Update Limit Strategy
Mark Žic, Iztok Fajfar, Vanja Subotić, Sergei Pereverzyev, Matevž Kunaver
January 24, 2022
Identification of ongoing processes in solid oxide fuel cells (SOFC) enables both optimizing the operating environment and prolonging the lifetime of SOFC. The Levenberg−Marquardt algorithm (LMA) is commonly used in the characterization of unknown electrochemical processes within SOFC by extracting equivalent electrical circuit (EEC) parameter values from electrochemical impedance spectroscopy (EIS) data. LMA is an iteration optimization algorithm regularly applied to solve complex nonlinear least square (CNLS) problems. The LMA convergence can be boosted by the application of an ordinary limit strategy, which avoids the occurrence of off-limit values during the fit. However, to additionally improve LMA descent properties and to discard the problem of a poor initial parameters choice, it is necessary to modify the ordinary limit strategy. In this work, we designed a new automatic update (i.e., adaptive) limit strategy whose purpose is to reduce the impact of a poor initial parameter choice. Consequently, the adaptive limit strategy was embedded in a newly developed EIS fitting engine. To demonstrate that the new adaptive (vs. ordinary) limit strategy is superior, we used it to solve several CNLS problems. The applicability of the adaptive limit strategy was also validated by analyzing experimental EIS data collected by using industrial-scale SOFCs.
Keywords
automatic limit strategy, CNLS, LMA, off-limits, processes
Suggested Citation
Žic M, Fajfar I, Subotić V, Pereverzyev S, Kunaver M. Investigation of Electrochemical Processes in Solid Oxide Fuel Cells by Modified Levenberg−Marquardt Algorithm: A New Automatic Update Limit Strategy. (2022). LAPSE:2022.0015
Author Affiliations
Žic M: Ruđer Bošković Institute, P.O. Box 180, 10000 Zagreb, Croatia
Fajfar I: Faculty of Electrical Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia [ORCID]
Subotić V: Institute of Thermal Engineering, Graz University of Technology, Inffeldgasse 25b, A-8010 Graz, Austria
Pereverzyev S: Johann Radon Institute for Computational and Applied Mathematics, Altenbergerstrasse 69, A-4040 Linz, Austria
Kunaver M: Faculty of Electrical Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia [ORCID]
Journal Name
Processes
Volume
9
Issue
1
First Page
pr9010108
Year
2021
Publication Date
2021-01-07
Published Version
ISSN
2227-9717
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PII: pr9010108, Publication Type: Journal Article
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LAPSE:2022.0015
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doi:10.3390/pr9010108
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Jan 24, 2022
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Jan 24, 2022
 
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Calvin Tsay
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