Three-Phase Quasi-Z-Source Rectifier Modeling

A quasi-Z-source three-phase rectifier is analysed by deriving its detailed dynamic model using circuit averaging and the synchronous reference frame. The quasi-Z-source provides the same advantages as the Z-source rectifier as well as additional advantages such lower rated capacitors. The quasi-Z-source rectifier contains non minimum phase zeros in its control to output voltage and control to inductor L-1 current transfer function similar the Z-source rectifier. The presence of these RHP zeros tends to destabilize the wide-bandwidth feedback loop and impose a maximum control bandwidth. Bode plots results are presented to validate the model developed.