Islanding is the electrical phenomenon in a part of arnpower network disconnected from the utility, where thernloads are entirely supplied by PV(Photovoltaic) systems,rnand the voltage and frequency are maintained aroundrnnominal values. But the probability of islanding isrnextremely low, and it may never occur in practice. At thernpoint of disconnection of an islanding, it is essential thatrnthe active power of PV system is very close to the activernpower of the loads, and that the reactive power of Pvsystemrnis very close to zero. But unintentional islandingrnmay result in power-quality issues, interference to gridprotectionrndevices, equipment damage, and evenrnpersonnel safety hazards. This paper proposes that thernthree phase PV-AF (Photovoltaic and active filter) systemrnfundamentally has the anti-islanding function. So, in thisrnpaper, anti-islanding function of this system is explained.rnAnd it is evaluated by simulations, usingrnPSCAD/EMTDC.
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