Improving power quality in cascade multilevel converters based on single-phase nonregenerative power cells

Carlos R. Baier, José R. Espinoza, Marco Rivera, Javier A. Muñoz, Bin Wu, Pedro E. Melín, Venkata Yaramasu

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Interharmonics exist in the ac supply currents in ac/dc/ac drives mainly due to the poor decoupled behavior of the dc-link stage. This issue is particularly evident when different input/output operating frequencies are used, causing harmful effects on power transformers and reducing the system efficiency and power quality. Consequently, large interharmonics can be found in converters with single-phase stages, as they require large electrolytic capacitors to filter out the dc-link second harmonic of voltage and current, which is usually not fully accomplished. This is the case of the cascade multilevel converter based on single-phase power cells, where each module has a single-phase rectifier and a single-phase inverter stage that cannot be effectively decoupled with standard size capacitors. This paper shows that it is possible to improve the quality of the power cell input currents when the input/output frequencies are different in the cascade multilevel converter. This is achieved by means of magnetic couplings among the dc-links of the power cells that feed different output phases, while keeping the high power quality on the load side.

Original languageEnglish (US)
Article number6658877
Pages (from-to)4498-4509
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number9
StatePublished - Sep 2014
Externally publishedYes


  • AC-AC power conversion
  • electromagnetic coupling
  • multicell single-phase topology
  • multilevel system
  • power electronics
  • variable-speed drives

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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