This paper presents an improved controller

for the dual topology of the unified power quality conditioner

(iUPQC) extending its applicability in power-quality

compensation, as well as in microgrid applications. By

using this controller, beyond the conventional UPQC power

quality features, including voltage sag/swell compensation,

the iUPQC will also provide reactive power support to

regulate not only the load-bus voltage but also the voltage

at the grid-side bus. In other words, the iUPQC will

work as a static synchronous compensator (STATCOM) at

the grid side, while providing also the conventional UPQC

compensations at the load or microgrid side. Experimental

results are provided to verify the new functionality of the

equipment.