A Four-level π-type Converter for Low-voltage Applications

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

19 Citations (Scopus)
311 Downloads (Pure)


This paper has introduced a four-level π-type converter for low-voltage applications which has a simple structure with six switches per phase leg. The line output voltage has seven levels and the output harmonics is much lower than the conventional two-level converter. The switching states and their associated output voltage levels have been analyzed. A simple carrier-based modulation method with zero-sequence signal injection has been devised to modulate the converter and regulate dc-link neutral points’ voltages. The two neutral points’ voltages can be well controlled with a back to back configuration even under high modulation index and high power factor. Simulation and experimental results have validated the topology, modulation and control strategy for the four-level π-type converter.
Original languageEnglish
Title of host publication2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)
Subtitle of host publicationProceedings of a meeting held 8-10 September 2015, Geneva, Switzerland
Place of PublicationSwitzerland
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages10
ISBN (Electronic)9789075815238
ISBN (Print)9781479982776
Publication statusPublished - Jan 2016
EventEPE’15 ECCE – Europe - Switzerland, Geneva, Switzerland
Duration: 8 Sep 201510 Sep 2015


ConferenceEPE’15 ECCE – Europe


  • Multilevel converters
  • Converter circuit
  • Converter control
  • Modulation strategy


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