Symmetrical hybrid multilevel DCAC converters with reduced number of insulated DC supplies

Domingo A. Ruiz-Caballero, Reynaldo M. Ramos-Astudillo, Samir Ahmad Mussa, Marcelo Lobo Heldwein

Research output: Contribution to journalArticlepeer-review

146 Scopus citations


Novel symmetric hybrid multilevel topologies are introduced for both single- and three-phase medium-voltage high-power systems. The topology conception is presented in detail, where a three-level switching cell with low component count, and its modulation pattern give the origin of the proposed converters. Voltage sharing and low output-voltage distortion are achieved. The theoretical frequency spectra are derived. Switching devices are separated into high- and low-frequency devices, generating hybrid converters. Five-level three-phase topologies are generated from only three insulated dc sources, while the number of semiconductors is the same as for the cascaded H bridge. Both simulation and experimental results are provided showing the validity of the analysis.

Original languageEnglish
Article number5339229
Pages (from-to)2307-2314
Number of pages8
JournalIEEE Transactions on Industrial Electronics
Issue number7
StatePublished - Jul 2010
Externally publishedYes


  • DC-AC converters
  • Hybrid inverters
  • Modulation
  • Symmetrical multilevel converters


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