Current-fed quasi-z-source inverter with voltage buck-boost and regeneration capability

Shuitao Yang, Fang Z. Peng, Qin Lei, Ryosuke Inoshita, Zhaoming Qian

Research output: Contribution to journalArticlepeer-review

94 Scopus citations


The conventional current-source inverter has two major problems: unidirectional power flow and voltage boost operation, which make it impossible to be used in many applications, such as hybrid electric vehicles and general-purpose variable-speed motor drives. Z-source inverters (ZSIs) can solve both problems. Quasi-ZSIs (qZSIs) were recently proposed as an important improvement to traditional ZSIs. Besides the advantages inherited from ZSIs, qZSIs also have several of their own merits. This paper presents a comprehensive study on the new features of current-fed qZSI, including the advantageous buck-boost function, improved reliability, reduced passive component ratings, and unique regeneration capability. The current-fed qZSIs are bidirectional with an additional diode, unlike the voltage-fed ZSI that needs a switch to achieve bidirectional power flow. A modified space vector pulse-width-modulation method is proposed, and the available operating regions for motoring and regeneration operation are analyzed in this paper. Since the current-fed qZSI has the same operation as the current-fed ZSI, many results of this paper are also applicable to the current-fed ZSI. A reverse-blocking insulated-gate bipolar-transistor- based current-fed qZSI prototype was developed in the laboratory. Simulation and experimental results are shown to verify the theoretical analysis.

Original languageEnglish (US)
Article number5677466
Pages (from-to)882-892
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number2
StatePublished - Mar 2011
Externally publishedYes


  • Current-source inverter (CSI)
  • Z-source inverter (ZSI)
  • regeneration capability
  • voltage buck–boost
  • voltage-source inverter (VSI)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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