Supercapacitor sizing based on desired power and energy performance

Alon Kuperman, Martin Mellincovsky, Chaim Lerman, Ilan Aharon, Noam Reichbach, Gal Geula, Ronen Nakash

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


In this paper, instantaneous power and energy capabilities of supercapacitor (SC) connected to a power element are derived for an arbitrary power profile, given either in analytical or statistical distribution form. A class of applications is considered where the device is used as deeply cycled energy storage with significant capacity, absorbing/supplying the whole power flow or its significant component rather than shaving low-energy high-frequency peaks. The analytical derivation of SC behavior is based on simple RC model with parameters taken from a manufacturer datasheet. It is shown that the commonly adopted 'state-of-charge' indication based on terminal voltage only is insufficient to reflect the energy balance for both charging and discharging; hence an alternative definition of 'state-of-energy' is proposed for each direction of energy flow, depending on both instantaneous power and terminal voltage. A simplified quick noniterative sizing procedure is proposed at the expense of a slightly oversized SC. Comprehensive example is provided in order to reinforce the proposed method of analyzing SC performance and demonstrate sizing procedure.

Original languageEnglish
Article number6675069
Pages (from-to)5399-5405
Number of pages7
JournalIEEE Transactions on Power Electronics
Issue number10
StatePublished - Oct 2014


  • Power and energy capability
  • sizing
  • state of energy
  • supercapacitor (SC)


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