Wind Turbine - Current vs Power trend
If the data is from a Siemens turbine, it seems likely that a "reactive power at no wind" control scheme is responsible for high current with low or zero power. Even if it is not a Siemens system, some similar scheme is likely responsible assuming there is no problem with the presentation of the data.

However, it is difficult to understand how plotting current vs. power reveals anything useful about the performance of the system.