Fault-tolerant strategies in MMC-based high power magnet supply for particle accelerator
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Other documents of the author: Colmenero Moratalla, Manuel; Vidal-Albalate, Ricardo; Blanquez Delgado, Francisco R.; Blasco Giménez, Ramón
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Title
Fault-tolerant strategies in MMC-based high power magnet supply for particle acceleratorAuthor (s)
Date
2023Publisher
ElsevierBibliographic citation
Moratalla, M. C., Vidal-Albalate, R., Delgado, F. R. B., & Blasco-Gimenez, R. (2024). Fault-tolerant strategies in MMC-based high power magnet supply for particle accelerator. Mathematics and Computers in Simulation, 224, 63-79.Type
info:eu-repo/semantics/articlePublisher version
https://www.sciencedirect.com/science/article/pii/S0378475423002951Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Many particle accelerators require to supply chains of magnets with high quality, high magnitude, cycling currents. To
do this, the power converters need to provide high output voltages, reaching in some cases tens ... [+]
Many particle accelerators require to supply chains of magnets with high quality, high magnitude, cycling currents. To
do this, the power converters need to provide high output voltages, reaching in some cases tens of kilovolts. Additionally,
converters are required to store the magnet energy during de-magnetization cycles. For such application, Full-bridge Modular
Multilevel Converters (FB-MMC) could be used given their capacity to store energy and their inherent reliability. In this sense,
one of the most interesting features of the proposed topology is the possibility of bypassing one or several submodules in
the event of a fault or malfunction. By doing this, it is possible to ride-through the failure of a component and avoid the
interruption of the accelerator operation.
However, when the number of submodules is small, this operation could lead to an excessive charge of the healthy cells,
increasing the risk of secondary failures. Besides, undesired harmonic content could appear on the output current, degrading the
operation of the accelerator. It is then necessary to implement strategies that allow to remove a faulty cell without significantly
impacting the operation of the remaining ones and of the converter itself.
Accordingly, the purpose of this article is to investigate several of these strategies and assess them. By means of detailed
computer simulations, the behaviour of the converter during normal and submodule fault conditions is analysed. Then, several
fault-tolerant strategies are described, verified and compared with the aid of simulation tools. The results show the effectiveness
of the analysed strategies in avoiding the overvoltage on the healthy submodules after a cell bypass and the little impact of
this operation on the quality of the converter output current. [-]
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Mathematics and Computers in Simulation, 2024, 224, part ARights
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Except where otherwise noted, this item's license is described as 0378-4754/© 2023 The Author(s). Published by Elsevier B.V. on behalf of International Association for Mathematics and Computers in
Simulation (IMACS). This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).