Abstract: | The rotational speed of a wind turbine is limited by the noise constraint of the blade tip speed. The larger the rotor diameter
is, the smaller the rotor speed becomes. Therefore, there exists a transition region connecting the max-Cp operation with
the power regulation operation. A conventional pitch schedule in this region involves using a fixed pitch. However, if the
variable pitch instead of the fixed one is allowed, more electric power can be extracted from the wind. The benefit of using
this strategy is analyzed from the point of how much the electric energy can be gained by applying the variable pitch schedule
in this transition region. |