Wind turbine control method and system

A control system for a wind turbine, the wind turbine comprising a plurality of rotor blades, an adaptive flow regulating system having a plurality of individually controllable adaptive flow regulating devices arranged on the rotor blades, and a pitch regulating system for regulating a pitch angle of each rotor blade, the control system comprising:

• a first controller for controlling the adaptive flow regulating system;
• a second controller for controlling the pitch regulating system;
• a diagnostic unit for determining a diagnostic value indicative of an operational efficiency of the adaptive flow regulating system;
• and
• a controller gain unit configured to determine a first gain value for the first controller and a second gain value for the second controller based on the diagnostic value;
• wherein the first controller is configured to apply the first gain value to control signals for the adaptive flow regulating system;
• and
• wherein the second controller is configured to apply the second gain value to control signals for the pitch regulating system.