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Design of Fault-bypass Circuit for DC Solid-state Transformer Unit
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Yi ZHOU, Xin WU, Haoyuan WENG, Haihong LONG, Dehong XU  Fellow, CPSS
Journal of Power Supply | 2026, 24(1) : 72 - 78
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Journal of Power Supply | 2026, 24(1): 72-78
• Power Converter Topologies •
Design of Fault-bypass Circuit for DC Solid-state Transformer Unit
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Yi ZHOU, Xin WU, Haoyuan WENG, Haihong LONG, Dehong XU  Fellow, CPSS
Affiliations
  • Institute of Power Electronics, Zhejiang University, Hangzhou 310027, China
Published: 2026-01-30 doi: 10.13234/j.issn.2095-2805.2026.1.72
Outline
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A typical configuration of a DC solid-state transformer is formed by connecting standardized power conversion cells in an input-series output-parallel (ISOP) arrangement to achieve DC transformation from medium voltage to low voltage. To provide redundancy for the power conversion cells, a thyristor bypass circuit is typically required. While DC solid-state transformers generally employ SiC MOSFET devices, the high dv/dt characteristic of SiC MOSFETs can readily false triggering in the thyristor bypass circuit. The issue of false triggering in thyristor bypass circuits is focused on, and a co-design methodology involving the thyristor snubber circuit and the gate-parallel resistor is explored. The proposed approach aims to enhance the operational reliability of the thyristor bypass circuit in high dv/dt environments, and experimental validation is provided.

DC solid-state transformer  /  input-series output-parallel  /  thyristor bypass circuit  /  false triggering
周懿, 吴昕, 翁浩源, 龙海鸿, 徐德鸿中国电源学会会士. 直流固态变压器单元故障旁路电路设计. 电源学报, 2026 , 24 (1) : 72 -78 . DOI: 10.13234/j.issn.2095-2805.2026.1.72
Yi ZHOU, Xin WU, Haoyuan WENG, Haihong LONG, Dehong XU. Design of Fault-bypass Circuit for DC Solid-state Transformer Unit[J]. Journal of Power Supply, 2026 , 24 (1) : 72 -78 . DOI: 10.13234/j.issn.2095-2805.2026.1.72
Funding
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  • National Natural Science Foundation of China(52037010)
Appendix
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Year 2026 volume 24 Issue 1
85
9
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.1.72
  • Receive Date：2025-01-03
  • Online Date：2026-10-26
  • Published：2026-01-30
Article Data
Affiliations
History
  • Received：2025-01-03
  • Revised：2025-05-28
  • Accepted：2025-06-16
Funding
National Natural Science Foundation of China(52037010)
Affiliations
    Institute of Power Electronics, Zhejiang University, Hangzhou 310027, China
References
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小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
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