A Family of Fault-tolerant Single-phase 15-level Inverters for UPS Applications

Tohid Rahimi, Ehsan Pashajavid, Mehdi Fallah, Josep Pou, Ali Arefi, Ka Hong Loo

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


This paper presents a family of fault-tolerant single-phase inverter topology for uninterruptible power supply (UPS) systems. The core structure is a 15-level inverter, consisting of two unidirectional switches, eight bidirectional switches, and six DC voltage sources. The proposed topology can facilitate realizing fault-tolerant multi-module inverters. If one of the power sources or semiconductor devices fails in one of the modules, the remaining modules can alternatively deliver all the expected voltage levels. Thus, this efficiently eliminates the possibility of UPS system failure for critical applications. The proposed topology is compared with the conventional 15-level inverters regarding the number of voltage sources, switches, and drivers to prove its advantages. The gate signals for the switches are produced employing the fundamental frequency switching technique. Further, the efficacy and performance of the proposed topology are supported with the simulation and experimental validations.

Original languageEnglish
Title of host publicationProceedings of 2021 31st Australasian Universities Power Engineering Conference, AUPEC 2021
EditorsSumedha Rajakaruna, Ahmed Abu Siada, Ho Ching Iu, Arindam Ghosh, Tyrone Fernando
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665434515
Publication statusPublished - Sep 2021
Event31st Australasian Universities Power Engineering Conference, AUPEC 2021 - Virtual, Online, Australia
Duration: 26 Sep 202130 Sep 2021

Publication series

NameProceedings of 2021 31st Australasian Universities Power Engineering Conference, AUPEC 2021


Conference31st Australasian Universities Power Engineering Conference, AUPEC 2021
CityVirtual, Online


  • 15-level inverter
  • Fault-tolerant structure
  • Multi-module inverter
  • Uninterruptible power supply (UPS)

ASJC Scopus subject areas

  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Energy Engineering and Power Technology

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