6.4.2 Partial load operation
Wind speed
2.5 m/s ≤ v < 13.9 (2.35 MW) / 16 (3 MW) m/s
During partial load operation (i.e., the wind speed is between the cut-in wind speed and the rated
wind speed) the maximum possible power is extracted from the wind. Rotor speed and power out‐
put are determined by the current wind speed. Pitch control already starts as the WEC approaches
full load operation so as to achieve a smooth transition.
6.4.3 Idle mode
Wind speed
v < 2.5 m/s
At wind speeds below 2.5 m/s no power can be fed into the grid. The wind energy converter runs in
idle mode, i.e., the rotor blades are turned almost completely out of the wind (60° blade angle) and
the rotor turns slowly or stops completely if there is no wind at all.
Slow movement (idling) puts less strain on the hub bearings than longer periods of complete stand‐
still; in addition, the WEC can resume power generation and power feed more quickly as soon as
the wind picks up.
Control system
D0376616-2 / DA 16 of 21
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