Elektrotechnisches Institut (ETI)

Analysis and Modeling of the Quasi-Z-Source-Inverter

  • Author:

    Andreas Liske, Gerhard Clos, Michael Braun

  • Source:

    IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society, Melbourne

  • Date: 7. - 10. November 2011
  • This  paper  presents  a  dynamic  average  model  of
    the  Quasi-Z-Source  Inverter  (QZSI),  based  on  the  short  term
    average values over one PWM-period, and the analysis of the
    possible switching states that can occur in the QZSI. The model
    is considerably descriptive since the modeling has been performed
    by analyzing the physical and functional relations with only little
    mathematical  complexity.  Another  advantage  of  the  proposed
    model is that the load current only acts as a disturbance input,
    and is not directly linked with the model structure itself. This
    allows  a  separate  examination  of  either  command  input  or
    disturbance response and makes the model independent of the
    given load. The model has been tested successfully in conjunction
    with  an  adequate  cascade  control  loop  design  and  a  QZSI-
    prototype in hardware.