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Submodule temperature regulation and balancing in modular multilevel converters

Goncalves, Jorge, Rogers, Daniel J. and Liang, Jun 2018. Submodule temperature regulation and balancing in modular multilevel converters. IEEE Transactions on Industrial Electronics 65 (9) , pp. 7085-7094. 10.1109/TIE.2018.2795588

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Abstract: In modular multilevel converters, temperature control of semiconductor devices in the sub-modules is a key factor for the safe and reliable operation. Under normal operation significant temperature differences can exist between sub-modules due to, for example, ageing of semiconductor modules and module parameter mismatch. This paper presents a method for achieving sub-module thermal balancing by controlling the capacitor voltage of each sub-module in an arm, while maintaining the sum of the sub-module capacitor voltages at a constant value in order to regulate the dc-link voltage. The proposed temperature balancing strategy is validated using an experimental modular multilevel converter setup with three sub-modules, where an increase in the thermal resistance to ambient of one or more sub-module semiconductors is created by restricting coolant flow to simulate a partial failure in the cooling system. Increases in the thermal resistance by 21 % and 42 %, corresponding to temperature increases of 5 μC and 10 μC, respectively, are managed by three sub-modules, using a capacitor voltage margin of 60 %.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0278-0046
Date of First Compliant Deposit: 12 February 2018
Date of Acceptance: 3 January 2018
Last Modified: 19 Oct 2019 03:24

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