4.8 Article

Analysis and Control of Modular Multilevel Matrix Converters Under Branch Fault Conditions

Journal

IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 2, Pages 1682-1699

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3104349

Keywords

Circuit faults; Fault tolerant systems; Fault tolerance; Topology; Reactive power; Matrix converters; Capacitors; Branch current configuration; branch fault tolerance; energy balance; modular multilevel matrix converter (M3C)

Funding

  1. National Natural Science Foundation of China [51777110]

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This article proposes a novel branch current configuration method for enhancing the reliability of the M3C. The method can handle branch fault conditions and derive feasible branch current configurations while being adaptable to different load conditions.
The modular multilevel matrix converter (M3C) is a promising topology for high-voltage and high-power direct ac-to-ac power conversion applications. Fault tolerance ability is one of the advantages of the M3C. To further enhance the reliability of the M3C, this article proposes a novel branch current configuration method for branch fault conditions, which is available either one or two branches are failed. By deriving basic branch current configurations and analyzing branch dc power equations under branch fault conditions, feasible branch current configurations can be directly derived. In terms of minimizing the maximum peak branch current, the derived configuration is also the optimal one for the single branch fault condition. Compared with the existing method, the proposed method does not need to solve configuration coefficients of branch currents offline, which is automatically adaptive to different load conditions. An M3C prototype with three submodules each branch is built, and experimental results are presented to validate the proposed branch fault tolerance method.

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