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Charge evaluation of EDLC for autonomous microgrid energy storage

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Abstract

Electric double layer capacitor (EDLC) is now playing more and more roles in microgrids for renewable energy storage due to its characteristic merits in high charging and high energy density. Different charging modes of EDLC are mainly studied in this paper. Compared with traditional constant-voltage and constant-current charging modes, constant-power charging mode (CPCM) ranks more reasonable positions for autonomous systems. Numerical calculations were presented for practical analysis, which was validated to be accurate enough and applicable by a simple case with PV/EDLC system configuration. Charging efficiency of different charging modes was also reviewed with strict mathematic deductions. Furthermore, trade-off problems, between charging time/efficiency/energy loss, were also investigated in brief for practical optimization of application occasions. For practical applications, how to utilize and manage the relationship of shifting modes in a reasonable way can be dealt with the actual requirements.

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Abbreviations

C :

Capacitance of EDLC

E :

Total charge energy

E EDLC :

Energy stored in EDLC

I :

Charge current

P in :

Injection charging power

Q :

Electric quantity

R :

Equivalent series resistance

t charge :

Total charge time

V in :

Input charging voltage

V C :

Capacitor voltage

V C0 :

Initial capacitor voltage

V Cf :

Final capacitor voltage

V shift :

Voltage of mode-shifting point

W loss :

Total energy loss

ΔT :

Time gap

η :

Charging efficiency

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Authors and Affiliations

  1. School of Electrical Engineering, Southeast University, Nanjing, 210096, China

    Qingshan Xu & Guoqing Tang

  2. Power Electrical Engineering, RWTH University, Aachen, Germany

    Hui Cai

  3. Department of Electrical Engineering, Aichi Institute of Technology, Toyota, Japan

    Qingshan Xu, Kazuto Yukita & Katsuhiro Ichiyanagi

Authors
  1. Qingshan Xu
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  2. Hui Cai
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  3. Guoqing Tang
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  4. Kazuto Yukita
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  5. Katsuhiro Ichiyanagi
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Corresponding author

Correspondence to Qingshan Xu.

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Xu, Q., Cai, H., Tang, G. et al. Charge evaluation of EDLC for autonomous microgrid energy storage. Electr Eng 93, 1–8 (2011). https://doi.org/10.1007/s00202-010-0185-z

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  • DOI: https://doi.org/10.1007/s00202-010-0185-z

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