Charge replacement in hybrid electrical energy storage systems

Qing Xie, Yanzhi Wang, Massoud Pedram, Younghyun Kim, Donghwa Shin, Naehyuck Chang

Research output: Chapter in Book/Entry/PoemConference contribution

25 Scopus citations


Hybrid electrical energy storage (HEES) systems are composed of multiple banks of heterogeneous electrical energy storage (EES) elements with distinctive properties. Charge replacement in a HEES system (i.e., dynamic assignment of load demands to EES banks) is one of the key operations in the system. This paper formally describes the global charge replacement (GCR) optimization problem and provides an algorithm to find the near-optimal GCR control policy. The optimization problem is formulated as a mixed-integer nonlinear programming problem, where the objective function is the charge replacement efficiency. The constraints account for the energy conservation law, efficiency of the charger/converter, the rate capacity effect, and self-discharge rates plus internal resistances of the EES element arrays. The near-optimal solution to this problem is obtained while considering the state of charges (SoCs) of the EES element arrays, characteristics of the load devices, and estimates of energy contributions by the EES element arrays. Experimental results demonstrate significant improvements in the charge replacement efficiency in an example HEES system comprised of banks of battery and supercapacitor elements with a high-power pulsed military radio transceiver as the load device.

Original languageEnglish (US)
Title of host publicationASP-DAC 2012 - 17th Asia and South Pacific Design Automation Conference
Number of pages6
StatePublished - 2012
Externally publishedYes
Event17th Asia and South Pacific Design Automation Conference, ASP-DAC 2012 - Sydney, NSW, Australia
Duration: Jan 30 2012Feb 2 2012

Publication series

NameProceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC


Other17th Asia and South Pacific Design Automation Conference, ASP-DAC 2012
CitySydney, NSW

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering


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