Recovering Partial Three-Level Operation in a T-Type Inverter with Fault Management Redundant Unit

Borong Wang, Zhan Li, Minghan Dong, Zhihong Bai, Philip T. Krein, Hao Ma

Research output: Contribution to journalArticlepeer-review


A redundant unit has been utilized in prior work for a T-type three-level inverter to handle multiple open-circuit faults, but the output was limited to two levels. In this article, equivalent switching state and improved virtual vector methods are proposed to complement switching states and provide better fault-tolerant performance. Under fault scenarios, equivalent replacement of unreachable switching states can be used to generate the target line-to-line voltages. If the replacement cannot be achieved by equivalent switching states, a virtual vector with redundant capability is employed to support two- and three-level modulations at the output. The rearranged switching sequences can be formed by employing virtual vectors and existing vectors. In addition, by reconstructing the virtual vectors, a balancing method is adopted to eliminate neutral point voltage offset in cases of multiple faults. Experimental tests verify the effectiveness and feasibility of the proposed method.

Original languageEnglish (US)
Article number8989814
Pages (from-to)8944-8955
Number of pages12
JournalIEEE Transactions on Power Electronics
Issue number9
StatePublished - Sep 2020


  • Fault-tolerant control
  • Multiple open-circuit faults
  • Redundant topology
  • Space vector modulation (SVM)
  • T-type inverters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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