MATEC Web of Conferences
Volume 180, 201813th International Conference Modern Electrified Transport – MET’2017
|Number of page(s)||6|
|Section||Energy Effectiveness of Transport|
|Published online||27 July 2018|
Application of supercapacitors in electric traction storage systems
Warsaw University of Technology, Institute of Electrical Power Engineering, Electric Traction Division, ul. Koszykowa 75, 00-662, Warsaw, Poland
2 University of Social Sciences, Information Technology Institute, ul. Sienkiewicza 9, 90-113, Łódź, Poland
* Corresponding author: email@example.com
Energy storage systems (ESS) are based on electrochemical batteries and supercapacitors (SC). SCs have a lower energy density compared to batteries, but have an advantage over them in power density. The combined use of the two in a hybrid ESS (HESS) gives both high energy density and high power density of ESSs. Fractional-order impedance describes the SC dynamics better than commonly used integer order impedance. Such a description can be based on the dielectric relaxation equations e.g. Cole-Cole equation used in this work. The paper compares results of the impedance approximation of a number of SC’s with various fractional and integer models, on the basis of which the time responses are analysed. The methods of capacitance and ESR measurement recommended by the IEC standard are examined. They are compared with the methods used in practice by SC producers. The problem of energy losses in ESS with respect to charging/discharging current pulses is presented. A proper ESS designing requires an accurate approximation of the SC impedance over the frequency band in which the dominant part of the power spectrum of current pulses is located.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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