Investigation of Fault-Tolerant Capabilities in an Advanced Three-Level Active T-Type Converter

Ramin Katebi, Jiangbiao He, Nathan Weise

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


A novel fault-tolerant three-level power converter topology, named advanced three-level active T-Type (A3L-ATT) converter, is introduced to increase the reliability of multilevel power converters used in safety-critical applications. This new fault-tolerant multilevel power converter is derived from the conventional T-Type converter topology. The topology has significantly improved the fault-tolerant capability under any open circuit or certain short-circuit faults in the semiconductor devices. In addition, under healthy condition, the redundant phase leg can be utilized to share overload current with other main legs, which enhances the overload capability of the converter. The conduction losses in the original outer devices can be reduced by sharing the load current with the redundant leg. Moreover, unlike other existing fault-tolerant power converters in the literature, full output voltages can be always obtained in this proposed A3L-ATT converter during fault-tolerant operation. A 13.5-kW ATT-A3L converter prototype was developed and constructed using silicon carbide MOSFETs. Simulation and experimental results were obtained to substantiate the theoretical claims of this new fault-tolerant power converter.

Original languageEnglish
Article number8356009
Pages (from-to)446-457
Number of pages12
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number1
StatePublished - Mar 2019

Bibliographical note

Publisher Copyright:
© 2013 IEEE.


  • Active T-Type (ATT) converter
  • fault-tolerant operation
  • open circuit
  • overload capability
  • redundant leg
  • short circuit
  • silicon carbide (SiC) MOSFET

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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