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Arm integrated double capacitor submodule for modular multilevel solid-state transformers with DC short-circuit fault ride-through capability

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Abstract

Modular multilevel converter-based solid-state transformers (MMC-SST) usually use the input series output parallel structure or the dual active bridge (DAB) structure. These two structures suffer from low power supply reliability and high economic costs, respectively. Therefore, based on hybrid frequency modulation, this paper proposes an arm integrated double capacitor submodule (AIDCSM)-type MMC-SST topology. This topology effectively reduces the number of switching devices by integrating the submodule arms, while enabling the topology to possess DC short-circuit fault ride-through capability. When compared to the DAB-type MMC-SST with half-bridge submodules, the proposed AIDCSM-type MMC-SST saves 2/5 switching devices and 1/2 high-frequency transformers, and enables uninterrupted operation under DC short-circuit faults. At the same time, the control strategy of the proposed AIDCSM-type MMC-SST is thoroughly investigated under both normal operating and DC short-circuit conditions. Simulation and experimental results demonstrate the correctness and effectiveness of the proposed topology and control method.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant numbers [52277188]) and the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (Grant numbers [22KJB470005]).

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Authors and Affiliations

  1. School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, Jiangsu, China

    Yinyu Yan, Yichao Sun, Wanxin Guo, Hao Jiang & Minqiang Hu

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  1. Yinyu Yan
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  2. Yichao Sun
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  3. Wanxin Guo
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  4. Hao Jiang
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Correspondence to Yichao Sun.

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Yan, Y., Sun, Y., Guo, W. et al. Arm integrated double capacitor submodule for modular multilevel solid-state transformers with DC short-circuit fault ride-through capability. J. Power Electron. (2024). https://doi.org/10.1007/s43236-024-00776-7

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  • DOI: https://doi.org/10.1007/s43236-024-00776-7

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