▁tower ▁ ▁The ▁generator ▁in ▁a ▁wind ▁tur bine ▁produces ▁altern ating ▁current ▁( AC ) ▁electric ity . ▁Some ▁tur b ines ▁drive ▁an ▁AC / AC ▁converter — which ▁converts ▁the ▁AC ▁to ▁direct ▁current ▁( DC ) ▁with ▁a ▁rect ifier ▁and ▁then ▁back ▁to ▁AC ▁with ▁an ▁in verter — in ▁order ▁to ▁match ▁the ▁frequency ▁and ▁phase ▁of ▁the ▁grid . ▁However , ▁the ▁most ▁common ▁method ▁in ▁large ▁modern ▁tur b ines ▁is ▁to ▁instead ▁use ▁a ▁doub ly ▁fed ▁induction ▁generator ▁directly ▁connected ▁to ▁the ▁electric ity ▁grid . ▁ ▁A ▁useful ▁technique ▁to ▁connect ▁a ▁permanent ▁magnet ▁synchron ous ▁generator ▁to ▁the ▁grid ▁is ▁by ▁using ▁a ▁back - to - back ▁converter . ▁Also , ▁we ▁can ▁have ▁control ▁schemes ▁so ▁as ▁to ▁achieve ▁unity ▁power ▁factor ▁in ▁the ▁connection ▁to ▁the ▁grid . ▁In ▁that ▁way ▁the ▁wind ▁tur bine ▁will ▁not ▁consume ▁re active ▁power , ▁which ▁is ▁the ▁most ▁common ▁problem ▁with ▁wind ▁tur b ines ▁that ▁use ▁induction ▁machines . ▁This ▁leads ▁to ▁a ▁more ▁stable ▁power ▁system . ▁Moreover , ▁with ▁different ▁control ▁schemes ▁a ▁wind ▁tur bine ▁with ▁a ▁permanent ▁magnet ▁synchron ous ▁generator ▁can ▁provide ▁or ▁consume ▁re active ▁power . ▁So , ▁it ▁can ▁work ▁as ▁a ▁dynamic ▁capac itor / indu ctor ▁bank ▁so ▁as ▁to ▁help ▁with ▁the ▁power ▁systems ' ▁stability . ▁▁ ▁Below ▁we ▁show ▁the ▁control ▁scheme ▁so ▁as ▁to ▁achieve ▁unity ▁power ▁factor ▁: ▁ ▁Re active ▁power ▁reg ulation