Power distribution control coordinating ultracapacitors and batteries for electric vehicles

Evren Ozatay, Ben Zile, Joel Robert Anstrom, Sean N. Brennan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

66 Scopus citations


Electrical energy storage is a central element to any electric-drivetrain technology - whether hybrid-electric, fuel-cell, or all-electric. A particularly cost-sensitive issue with energy storage is the high replacement cost of depleted battery banks. One possibility to ease the power burden on batteries and fuel cells is to use ultra-capacitors as load-leveling devices. The high power density of ultra-capacitors allows a significant reduction in the power fluctuations imposed on the remaining electrical system; however, the same ultra-capacitors have a very low energy density and therefore must be used sparingly and with coordination. A control strategy for coordinated power distribution is a central issue for ultracapacitor-supported systems. Toward this end, several control methods are implemented on an electric vehicle equipped with a battery/ultracapacitor system with the goal of improving battery life and overall vehicle efficiency. A particular goal is to obtain both a peaking load control and a frequency-weighted coordination between capacitor and battery in order to mitigate transients in the battery current demand. A key control design issue is that the control objectives vary with respect to vehicle velocity, driver's power demand, and state-of-charge of both the batteries and ultracapacitors. Ultracapacitor, hybrid-electric vehicle, control.

Original languageEnglish (US)
Title of host publicationProceedings of the 2004 American Control Conference (AAC)
Number of pages6
StatePublished - 2004
EventProceedings of the 2004 American Control Conference (AAC) - Boston, MA, United States
Duration: Jun 30 2004Jul 2 2004

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619


OtherProceedings of the 2004 American Control Conference (AAC)
Country/TerritoryUnited States
CityBoston, MA

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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