1 , ▁most ▁new ▁grid - connected ▁wind ▁tur b ines ▁are ▁variable ▁speed ▁wind ▁tur b ines — they ▁are ▁in ▁some ▁variable ▁speed ▁configuration . ▁ ▁Early ▁wind ▁tur bine ▁control ▁systems ▁were ▁designed ▁for ▁peak ▁power ▁extra ction , ▁also ▁called ▁maximum ▁power ▁point ▁tracking — they ▁attempt ▁to ▁pull ▁the ▁maximum ▁possible ▁elect rical ▁power ▁from ▁a ▁given ▁wind ▁tur bine ▁under ▁the ▁current ▁wind ▁conditions . ▁More ▁recent ▁wind ▁tur bine ▁control ▁systems ▁deliber ately ▁pull ▁less ▁elect rical ▁power ▁than ▁they ▁possibly ▁could ▁in ▁most ▁circumstances , ▁in ▁order ▁to ▁provide ▁other ▁benefits , ▁which ▁include : ▁ ▁spin ning ▁res erves ▁to ▁quickly ▁produce ▁more ▁power ▁when ▁needed — such ▁as ▁when ▁some ▁other ▁generator ▁suddenly ▁dro ps ▁from ▁the ▁grid — up ▁to ▁the ▁max ▁power ▁supported ▁by ▁the ▁current ▁wind ▁conditions . ▁ ▁Variable - speed ▁wind ▁tur b ines ▁can ▁( very ▁briefly ) ▁produce ▁more ▁power ▁than ▁the ▁current ▁wind ▁conditions ▁can ▁support , ▁by ▁storing ▁some ▁wind ▁energy ▁as ▁kin etic ▁energy ▁( ac cel er ating ▁during ▁brief ▁g ust s ▁of ▁faster ▁wind ) ▁and ▁later ▁converting ▁that ▁kin etic ▁energy ▁to ▁electric ▁energy ▁( de cel er ating , ▁either ▁when ▁more ▁power ▁is ▁needed ▁elsewhere , ▁or ▁during ▁short ▁l ull s ▁in ▁the ▁wind , ▁or ▁both ). ▁ ▁d amp ing ▁( elect rical ) ▁subs ynchronous ▁reson ances ▁in ▁the ▁grid ▁ ▁d amp ing ▁( me chan ical ) ▁reson ances ▁in ▁the