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On Thermal State-of-Charge Balancing using Cascaded Multilevel Converter
RISE, Swedish ICT, Viktoria.
2013 (English)In: Journal of Power Electronics (JPE), ISSN 1598-2092, E-ISSN 2093-4718, Vol. 13, no 4, p. 569-Article in journal (Refereed) Published
Abstract [en]

Multilevel Converters are studied for simultaneous_x000D_ use as a DC-motor drive active battery cell balancer._x000D_ The Multilevel Converter (MLC) allows to independently switch_x000D_ ON/OFF each battery cell in a battery pack giving the possibility_x000D_ of non-uniform use of the battery cells. By exploiting this_x000D_ property brake regeneration phases in the drive cycle, the_x000D_ MLC has the possibility to balance both State-of-Charge (SoC)_x000D_ temperature differences between the cells, which are two_x000D_ known causes of battery wear, without even reciprocating the_x000D_ coolant flow inside the pack. The optimal control policy (OP )_x000D_ that takes into consideration both the battery pack temperature_x000D_ SoC dynamics is studied in detail based on the assumption_x000D_ of perfect information of the state the future driving. The_x000D_ results show that OP gives significant reduction in temperature_x000D_ SoC deviations compared to uniform use of all the cells even_x000D_ under unidirectional coolant flow. Thus reciprocating coolant flow_x000D_ is a redundant function for MLC based cell balancer. A specific_x000D_ contribution of the paper is the derivation of a state-space electrothermal_x000D_ model of a battery submodule €”for both unidirectional_x000D_ as well as reciprocating coolant flow€” under the switching action_x000D_ of an MLC, formulated in such a way that the OP is given by_x000D_ the solution of a convex optimization problem._x000D_

Place, publisher, year, edition, pages
2013. Vol. 13, no 4, p. 569-
Keywords [en]
Hybrid electric vehicles, Multi-level converter, Batteries, Cell balancing, Thermal balancing, Convex optimization.
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:ri:diva-31993OAI: oai:DiVA.org:ri-31993DiVA, id: diva2:1151851
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2018-01-13Bibliographically approved

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