Paper Info
Title
Online And On-Board Battery Impedance Estimation Of Battery Cells, Modules Or Packs In A Reconfigurable Battery System Or Multilevel Inverter
Abstract
This paper shows two approaches to determine the battery impedance of battery cells or battery modules when used in a reconfigurable battery system (RBS) or in any type of modular multilevel converter (MMC) for electric drive applications. A generic battery model is used and the concepts of the recursive time and frequency-domain parameter extraction, using a current step and an electrochemical impedance spectroscopy, are explained. Thus, it is shown and demonstrated that the balancing current of neighboring cells/modules,when in parallel operation, can be used, similar to the time-domain parameter extraction utilizing a current step, to determine the battery parameters. Furthermore, it is shown and demonstrated that a part of the inverter can be used as variable AC voltage source to control a sinusoidal current through the motor inductances of the drive train, which can be injected to the inserted battery cells/modules of an adjacent phase to perform an on-board impedance spectroscopy. Using either of the two presented approaches, the individual battery impedances can be easily determined, yielding the state of health (SOH) and the power capability of individual battery cells/modules. Nonetheless, the analyzed approaches were just considered to be applied at machine standstill, which is not suitable for grid-tied applications.
Year
DOI
Venue
2020
10.1109/IECON43393.2020.9254515
IECON 2020: THE 46TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY
Keywords
DocType
ISSN
Batteries, Electrochemical impedance spectroscopy, Modular multilevel converters, Multilevel systems, Parameter estimation
Conference
1553-572X
Citations 
PageRank 
References 
0
0.34
0
Authors
7
Name
Order
Citations
PageRank
Anton Kersten100.68
Manuel Kuder201.01
Weiji Han313.40
torbjorn thiringer4156.29
Anton Lesnicar500.34
Thomas Weyh641.67
Richard Eckerle700.68