The Z-Source Inverter (ZSI) has been reported suitable for res
idential PV system because of the capability of
voltage boost and inversion in a single stage. Recently, four new topol
ogies, the quasi-Z-Source Inverters
(qZSI), have been derived from the original ZSI. This project ana
lyzes one voltage fed topology of these four
in detail and applies it to PV power generation systems. By using
the new quasi-Z-Source topology, the
inverter draws a constant current from the PV array and is capabl
e of handling a wide input voltage range. It
also features lower component ratings and reduced source stress
compared to the traditional ZSI. A prototype
which provides three phase 50-Hz, 230Vrms ac has been built in laboratory
. It is demonstrated from the
theoretical analysis and MATLAB/SIMULATION results that t
he proposed qZSI can realize voltage buck or
boost and dc-ac inversion in a single stage with high reliability
and efficiency, which makes it well suited for
PV power systems
