Discontinuous operation modes of current-fed Quasi-Z-Source inverter

Qin Lei, Fang Z. Peng, Shuitao Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

The conventional voltage source inverter is only a buck converter and conventional current source inverter is only a boost converter. By adding a Z-Source network [1], the buck-boost capability can be achieved. The recently proposed Quasi-Z-Source inverter (qZSI) [2] is an important improvement to Z-Source inverter (ZSI), which greatly reduces the passive component stress. The current-fed qZSI can buck-boost voltage and achieve bidirectional power flow without replacing the diode with an active switch [3]. It has lower current stress on inductor compared to current-fed ZSI. However, the analysis and control methods proposed in [3] are based on the assumptions that the capacitor voltage is almost constant and equal to the input voltage. These assumptions become invalid when the capacitor is very small or the lower power factor is low in some applications that the volume is a very crucial factor. The capacitor voltage has high ripple or even becomes discontinuous. In these cases, the circuit has two new operations modes except for the normal three modes, which is called discontinuous operation modes. This paper analyzes the characteristics of the discontinuous operation modes, and derives the critical conditions for these new modes under different control strategies. Simulation and experiment results are given to verify the theoretical analysis.

Original languageEnglish (US)
Title of host publication2011 26th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2011
Pages437-441
Number of pages5
DOIs
StatePublished - May 13 2011
Externally publishedYes
Event26th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2011 - Fort Worth, TX, United States
Duration: Mar 6 2011Mar 10 2011

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Other

Other26th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2011
CountryUnited States
CityFort Worth, TX
Period3/6/113/10/11

Keywords

  • Continuous
  • Discontinuous
  • Maximum constant boost control
  • Power factor
  • Quasi-Z-Source
  • SVPWM
  • current-fed

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Lei, Q., Peng, F. Z., & Yang, S. (2011). Discontinuous operation modes of current-fed Quasi-Z-Source inverter. In 2011 26th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2011 (pp. 437-441). [5744633] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). https://doi.org/10.1109/APEC.2011.5744633