Quasi-Z-Source Inverter With a T-Type Converter in Normal and Failure Mode

V. Fernao Pires, Armando Cordeiro, Daniel Foito, Joao F. Martins

Research output: Contribution to journalArticle

61 Citations (Scopus)


This paper presents a three-phase multilevel quasi-Z-source inverter (qZSI) topology operating in normal and fault-tolerant operation mode. This structure is composed by two symmetrical quasi-Z-source networks and a three-phase T-type inverter. Besides the intrinsic advantages of multilevel voltage source inverters, the proposed structure is also characterized by their semiconductor fault tolerance capability. This feature is only obtained through changes on the modulation scheme after the semiconductor fault and does not require additional extra-phase legs or collective switching states. In certain fault types, the reduction of the output power capacity will be compensated by the boost characteristic of the qZSI. The fault-tolerant behavior of the proposed topology is demonstrated by several simulation results of the converter in normal and fault condition. To validate the characteristics of this multilevel qZSI, an experimental prototype was also built to experimentally confirm the results.

Original languageEnglish
Article number7372481
Pages (from-to)7462-7470
Number of pages9
JournalIeee Transactions On Power Electronics
Issue number11
Publication statusPublished - 1 Nov 2016


  • fault tolerance
  • quasi-Z-source inverter
  • shoot-through
  • T-type converter

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