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Fault-Tolerant Space Vector Modulation for Modular Multilevel Converters With Bypassed Faulty Submodules
Ahmadi, Reza Jafarishiadeh, Seyyedmahdi Mahmoudi, Hamid Aleenejad, Moshen
Ahmadi, Reza
Jafarishiadeh, Seyyedmahdi
Mahmoudi, Hamid
Aleenejad, Moshen
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Abstract
This paper develops a modulation based fault-tolerant (FT) strategy for restoring the operation of three-phase modular multilevel converters (MMCs) with faulty switches. This FT strategy is based on a proposed modified space vector modulation (SVM) technique that generates balanced line-to-line (line) voltages even in the case of a fault occurrence. In the postfault operation, the proposed strategy is able to restore the fundamental amplitude of the line to the neutral (load) voltages to that of the normal operation condition with a slightly increased voltage stress over the switches in the faulty phase. In this paper, first a brief background about MMCs and SVM technique is provided. Then, the proposed FT strategy and the modified SVM technique are presented. Finally, several simulation and experimental results are provided to validate operation of the proposed strategy.
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Date
2018-08-01
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Publisher
IEEE
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Keywords
support vector machines, switches, capacitors, modulation, voltage control, fault tolerance, fault tolerance systems
Citation
M. Aleenejad, H. Mahmoudi, S. Jafarishiadeh and R. Ahmadi, "Fault-Tolerant Space Vector Modulation for Modular Multilevel Converters With Bypassed Faulty Submodules," in IEEE Transactions on Industrial Electronics, vol. 66, no. 3, pp. 2463-2473, March 2019.