Method for operating a cluster of wind turbines

A system, comprising:

• a cluster of wind turbines, the cluster of wind turbines comprising a plurality of wind turbines;
• and
• a controller being arranged to:
• obtain, from each wind turbine of the cluster of wind turbines, one or more measurements related to operation thereof;
• derive, for each wind turbine of the cluster of wind turbines, one or more parameter values of a parameter being indicative for a condition occurring at a given wind turbine of the cluster of wind turbines, based on the one or more measurements;
• compare the derived one or more parameter values for each wind turbine of the cluster of wind turbines to a trigger value for triggering measures for mitigating an effect of the condition, based on the parameter, and
• in a case that one of the derived one or more parameter values for a specific wind turbine of the cluster of wind turbines exceeds the trigger value, initiate the measures for mitigating the effect of the condition at the specific wind turbine, and
• wherein the controller is further arranged to:
• derive a distribution of the derived one or more parameter values for each wind turbine of the cluster of wind turbines, and deriving a mean of the derived distribution;
• compare the mean of the derived distribution to a mean of an expected distribution;
• and
• adjust the trigger value and subsequently applying the adjusted trigger value when comparing the derived one or more parameter values to the trigger value, and wherein the trigger value is adjusted on a basis of a difference between the mean of the derived distribution and the mean of the expected distribution.