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Reference: Chatzinikolaou, E, Daniel J. Rogers and Rogers, DJ, (2016). Cell SoC balancing using a cascaded full bridge multilevel converter in battery energy storage systems. IEEE Transactions on Industrial Electronics.Citable link to this page:

 

Cell SoC balancing using a cascaded full bridge multilevel converter in battery energy storage systems

Abstract: This paper presents a method for achieving individual electrochemical cell balancing by using a cascaded full bridge multilevel converter where a single electrochemical cell is connected to each converter module. As a result, balancing at cell level is possible without additional circuitry, making this topology ideal for long service life grid storage and applications using second-life cells where the cells are inherently poorly matched. In order to estimate the relative state of charge between cells, the control flexibility of the multilevel converter is used to remove each cell from the current path without interrupting the operation of the system. This process eliminates the effect of the internal cell resistance and fast transient electrochemical phenomena and therefore the measured voltage serves as a high quality ‘pseudo open circuit’ voltage measurement. The proposed balancing strategy is validated using a 25 level cascaded full bridge multilevel converter prototype for the individual balancing of twelve lithium polymer cells, during consecutive charging and discharging cycles. Successful balancing to within 5 mV of open circuit voltage is observed between cells with 45% difference in nominal capacity and 55% initial state of charge variation.

Peer Review status:Peer reviewedPublication status:PublishedVersion:Publisher's version Funder: Engineering and Physical Sciences Research Council   Notes:(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

Bibliographic Details

Publisher: Institute of Electrical and Electronics Engineers

Publisher Website: http://www.ieee.org/

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal: IEEE Transactions on Industrial Electronicssee more from them

Publication Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=41

Issue Date: 2016-04Identifiers

Urn: uuid:6e718b7f-e8e8-4b78-be8b-40258369aed1

Source identifier: 615145

Doi: https://doi.org/10.1109/TIE.2016.2565463

Issn: 0278-0046 Item Description

Type: Journal article;

Version: Publisher's versionKeywords: Cell balancing lithium-ion battery multilevel converter open-circuit voltage Tiny URL: pubs:615145

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Autor: Chatzinikolaou, E - institutionUniversity of Oxford Oxford, MPLS, Engineering Science - - - Daniel J. Rogers - - - Rogers, DJ - i

Fuente: https://ora.ox.ac.uk/objects/uuid:6e718b7f-e8e8-4b78-be8b-40258369aed1



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