Abstract
The active power filter (APF) that consists of
a half-bridge leg and an ac capacitor is integrated in the
single-phase quasi-Z-source inverter (qZSI) in this paper to
avoid the second harmonic power flowing into the dc side.
The capacitor of APF buffers the second harmonic power
of the load, and the ac capacitor allows highly pulsating ac
voltage, so that the capacitances of both dc and ac sides
can be small. A model predictive direct power control (DPC)
is further proposed to achieve the purpose of this newtopology
through predicting the capacitor voltage of APF at each
sampling period and ensuring the APF power to track the
second harmonic power of single-phase qZSI. Simulation
and experimental results verify the model predictive DPC
for the APF-integrated single-phase qZSI.
