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Submodule temperature regulation and balancing in modular multilevel converters

Goncalves, Jorge ORCID: https://orcid.org/0000-0002-5573-7742, Rogers, Daniel J. ORCID: https://orcid.org/0000-0001-8814-5332 and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 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

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: 23 Oct 2022 12:54
URI: https://orca.cardiff.ac.uk/id/eprint/109052

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