Analysis of errors in zero-free-parameter modeling approach to predict the voltage of electrochemical energy storage systems under arbitrary load

Date
2017
Advisor
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Source Title
ECS Transactions
Print ISSN
1938-6737
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Publisher
Electrochemical Society
Volume
77
Issue
11
Pages
99 - 104
Language
English
Type
Conference Paper
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Abstract

In a recently published article (J. Electrochem. Soc. 164 (2017) A1274-A1280), we described a new method to predict the voltage response of electrochemical energy storage systems during arbitrary load profiles. Our work shows that the impedance spectrum can be employed in the frequency domain in order to ultimately calculate the time domain behavior of the electrochemical energy storage system. The big advantage of this method is the fact that there are no free parameters and fits throughout. The present work deals with the sources of error in the above-mentioned prediction approach and looks for the effects of the various sources of error. The current analysis concludes that two big contributors to the overall error are the inaccuracies in the DC part of the prediction and the non-linearities that are not modeled by a linear impedance spectrum. Discussions are also made regarding ways to improve the performance of the modeling approach the most and where future work is going to be looking to improve.

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Keywords
Energy storage, Forecasting, Frequency domain analysis, Current analysis, Electrochemical energy storage, Free parameters, Frequency domains, Impedance spectrum, Load profiles, Model approach, Voltage response, Time domain analysis
Citation
Published Version (Please cite this version)