Feasibility Issues of using Three-Phase Multilevel Converter based Cell Balancer in Battery Management System for xEVs
Paper in proceeding, 2013

The use of a three-phase multilevel converter (MLC) as an integrated cell balancer and motor driver is investigated for three-phase AC applications in EVs/HEVs/PHEVs. The paper analyzed an issue of additional battery losses caused by the flow of reactive and/or harmonic power from each power cell of the three-phase MLC battery system. The paper also investigates the size of shunt capacitor required for compensation of the losses to acceptable level. This study concludes that the size of the required capacitor is too big for the vehicle application unless some other active compensation is used as well. Another practical way to employ the MLC as a cell balancer is to use it in a cascaded connection with the conventional three-phase two-level voltage source inverter however it may not be a cost-effective solution either due to high component count.

Three-phase multi-level converter

Cell balancing


Reactive power and dc-link current ripple issues

Hybrid electric vehicles

DC-link capacitor sizing


Faisal Altaf

Chalmers, Signals and Systems, Systems and control

Lars Johannesson

Chalmers, Signals and Systems, Systems and control

Bo Egardt

Chalmers, Signals and Systems, Systems and control

IFAC Symposium on Advances in Automotive Control

1474-6670 (ISSN)

Vol. 7 1 390-397
978-390282343-4 (ISBN)

Driving Forces

Sustainable development

Areas of Advance



Subject Categories

Control Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering





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