Analysis of errors in zero-free-parameter modeling approach to predict the voltage of electrochemical energy storage systems under arbitrary load
Author
Ulgut, Burak
Uzundal, Can Berk
Özdemir, Elif
Date
2017Source Title
ECS Transactions
Print ISSN
1938-6737
Publisher
Electrochemical Society
Volume
77
Issue
11
Pages
99 - 104
Language
English
Type
Conference PaperItem Usage Stats
177
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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.
Keywords
Energy storageForecasting
Frequency domain analysis
Current analysis
Electrochemical energy storage
Free parameters
Frequency domains
Impedance spectrum
Load profiles
Model approach
Voltage response
Time domain analysis