In contrast, when the wind speed V is lower than the cut in wind speed Vcut — in , the wind turbine generator 1 switches {HEAD ~ the operation} to {TAIL ~ the idling mode}  
to
In contrast , when the wind speed V is lower than the cut in wind speed Vcut — in , the wind turbine generator 1 switches { HEAD ~ the operation } to { TAIL ~ the idling mode }
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