Control of a series-input, parallel-output cell balancing system for electric vehicle battery packs

M. Muneeb Ur Rehman, Fan Zhang, Michael Evzelman, Regan Zane, Dragan Maksimovic

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

34 Scopus citations

Abstract

Cell balancing circuits are required in battery packs to equalize the state-of-charge (SOC) of series-connected cells. This paper presents a control strategy for a modular cell balancing architecture based on low-voltage bypass dc-dc converters that perform real-time active cell balancing using a shared low-voltage (LV) bus. Each bypass converter includes an autonomous controller, which employs a faster loop with a standard PI compensator to regulate the LV bus voltage and a slower loop with droop control to regulate SOC of each cell. The control strategy results in balanced LV load current sharing among bypass converters. Design and stability analysis details are provided for the cell balancing system and bypass converters. The control approach is verified by experimental results for a three series-connected Li-ion NMC battery cell system with three digitally controlled dual-active bridge bypass converters.

Original languageEnglish
Title of host publication2015 IEEE 16th Workshop on Control and Modeling for Power Electronics, COMPEL 2015
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)9781467368476
DOIs
StatePublished - 1 Sep 2015
Externally publishedYes
Event16th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2015 - Vancouver, Canada
Duration: 12 Jul 201515 Jul 2015

Publication series

Name2015 IEEE 16th Workshop on Control and Modeling for Power Electronics, COMPEL 2015

Conference

Conference16th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2015
Country/TerritoryCanada
CityVancouver
Period12/07/1515/07/15

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Control and Systems Engineering
  • Modeling and Simulation

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