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 total power output at {TAIL ~ wind farm level} being coordinated by the different dynamic variation values previously sent by the central control unit  
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 total power output at { TAIL ~ wind farm level } being coordinated by the different dynamic variation values previously sent by the central control unit
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