Z-Source Multilevel Inverters

Poh Chiang Loh, Yushan Liu, Haitham Abu-Rub, Baoming Ge

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)


There are two hotly researched Z-source/quasi-Z-source (ZS/qZS) multilevel inverters: the ZS/qZS neutral-point-clamped (NPC) inverter and ZS/qZS cascaded multilevel inverter (CMI). The ZS/qZS concept, integrating with those traditional multilevel inverters, inherits the merits of both topologies with improved inverter reliability due to short-circuit immunity. This chapter presents the configurations, operating principles, and modulation schemes of the two ZS/qZS multilevel inverters. Three-level NPC inverters, having many inherent advantages, are commonly used as the preferred topology for medium voltage ac drives. The CMI is a promising candidate for the next generation of PV power converters because it has features such as separate PV sources, transformerless, low harmonics, small filters, and low switching frequency. The system-level modeling and control of a qZS-CMI-based three-phase grid-tie PV power system were addressed, and simulation results were demonstrated, providing a competitive candidate for high-power medium-voltage power systems.

Original languageEnglish
Title of host publicationImpedance Source Power Electronic Converters
Number of pages32
ISBN (Electronic)9781119037088
ISBN (Print)9781119037071
Publication statusPublished - 7 Sep 2016



  • Cascaded multilevel inverter
  • High-power medium-voltage power systems
  • Neutral-point-clamped inverter
  • PV power converters
  • Quasi-Z-source multilevel inverters
  • Z-source multilevel inverters

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Loh, P. C., Liu, Y., Abu-Rub, H., & Ge, B. (2016). Z-Source Multilevel Inverters. In Impedance Source Power Electronic Converters (pp. 194-225). wiley. https://doi.org/10.1002/9781119037088.ch12