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

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

Andreas Liske, Gerhard Clos, Michael Braun


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.