wind energy installation is arranged such that flow is instant on it obliquely from natural or artificial structures when the wind is in a specific direction then the adaptation algorithm can be used to compensate for the corresponding direction discrepancy this is particularly applicable in situations in which there are a plurality of wind energy installations arranged in a wind park and mutual shadow effects occur with specific wind directions since the influences that result from this can frequently not be calculated sufficiently accurately in advance a self adapting algorithm has the advantage that it autonomously matches itself to the respective conditions this is particularly true even in those situations which can in general be calculated in advance only with difficulty if at all in which the wind speed or wind direction is or are not distributed homogeneously over the rotor area this is a phenomenon which can be observed quite frequently particularly in the case of modern large wind energy installations with rotor diameters of more than one hundred meters this is then followed by an evaluation device 4 which has essentially two channels with a classifier 40 at each input the classifier 40 is designed to then classify whether the data being applied to its input is the positive or negative wind direction and to pass it on as appropriate to the first or second output respectively a first channel is connected to the first output and a second channel is.