However, when the measured frequency deviates from the reference frequency , each wind turbine has all the necessary information to modify its generated active power instantly, {HEAD ~ the variation} in {TAIL ~ total power output} at wind farm level being coordinated by the different dynamic variation values previously sent by the central control unit  
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However , when the measured frequency deviates from the reference frequency , each wind turbine has all the necessary information to modify its generated active power instantly , { HEAD ~ the variation } in { TAIL ~ total power output } at wind farm level being coordinated by the different dynamic variation values previously sent by the central control unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH