Online Parameter Identification for Supercapacitor State-of-Health Diagnosis for Vehicular Applications

In power electronic applications, aging of the electric double layer capacitors (EDLCs) is considered as a serious issue since it may lead to failure. Their degradation is usually evaluated by an increase of the internal resistance or a decrease of the equivalent capacitance. These aging indicators...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-12, Vol.32 (12), p.9355-9363
Main Authors: El Mejdoubi, Asmae, Chaoui, Hicham, Gualous, Hamid, Sabor, Jalal
Format: Article
Language:English
Subjects:
Aging
Aging diagnosis
aging parameters
Capacitance
Diagnosis
Electric double layer
electric double-layer capacitor
Electrochemical impedance spectroscopy
Engineering Sciences
Environmental Sciences
Indicators
Integrated circuit modeling
Interruption
Materials
Mathematical model
Nonlinear analysis
Observers
Parameter estimation
Parameter identification
Physics
Reactive fluid environment
Resistance
S parameters
sliding mode observer
Spectroscopic analysis
Stability analysis
Supercapacitors
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Summary:In power electronic applications, aging of the electric double layer capacitors (EDLCs) is considered as a serious issue since it may lead to failure. Their degradation is usually evaluated by an increase of the internal resistance or a decrease of the equivalent capacitance. These aging indicators have a good correlation with the supercapacitor's state-of-health (SoH). Generally, SoH is measured by electrochemical impedance spectroscopy (EIS). However, this technique must be performed offline and requires interruption of the system's operation. In this paper, a sliding mode observer is designed to estimate online the EDLC's aging indicators. Unlike several online estimators, the supercapacitor's parameters are considered as a nonlinear random distribution with external noises which yields accurate estimation. In addition, the relationship between the capacitance and the bias voltage is considered to be nonlinear. Lyapunov stability analysis is also provided. The proposed approach is validated experimentally using a standardized dynamic current profile. Furthermore, comparison against EIS is carried out for different aging phases and under different environmental temperature conditions.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2655578