Voltage Source Multilevel Inverters with Reduced Device Count: Topological Review and Novel Comparative Factors

Ahmed Salem, Huynh Van Khang, Kjell G. Robbersmyr, Margarita Norambuena, Jose Rodriguez

Research output: Contribution to journalArticlepeer-review

168 Citations (Scopus)


Multilevel inverters (MLIs) have gained increasing interest for advanced energy-conversion systems due to their features of high-quality produced waveforms, modularity, transformerless operation, voltage, and current scalability, and fault-tolerant operation. However, these merits usually come with the cost of a high number of components. Over the past few years, proposing new MLIs with a lower component count has been one of the most active topics in power electronics. The first aim of this article is to update and summarize the recently developed multilevel topologies with a reduced component count, based on their advantages, disadvantages, construction, and specific applications. Within the framework, both single-phase and three-phase topologies with symmetrical and asymmetrical operations are taken into consideration via a detailed comparison in terms of the used component count and type. The second objective is to propose a comparative method with novel factors to take component ratings into account. The effectiveness of the proposed method is verified by a comparative study.

Original languageEnglish
Article number9149829
Pages (from-to)2720-2747
Number of pages28
JournalIEEE Transactions on Power Electronics
Issue number3
Publication statusPublished - Mar 2021


  • Asymmetric operation
  • comparison factor
  • component for each level (CEL)
  • dc-ac converter
  • multilevel inverter (MLI)
  • single-phase
  • symmetric operation
  • three-phase

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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