Method of operating a wind turbine

A method of operating a wind turbine having a rotor with a plurality of blades, a system for determining one or more loads on the wind turbine, a historical register of data on the wind turbine operation, and a control system for controlling one or more operational parameters of the wind turbine, the method comprising:

• determining the loads on the wind turbine;
• storing the determined loads on the wind turbine in the historical register:
• obtaining, from the historical register, a characteristic indicative of the loads on the wind turbine accumulated over time;
• determining one or more wind thrust limits depending on the obtained characteristic indicative of the loads accumulated over time;
• wherein determining the one or more wind thrust limits comprises determining a minimum wind thrust limit, wherein the determined minimum wind thrust limit depends on a rate of change of the characteristic indicative of the loads accumulated over time, wherein the determined minimum wind thrust limit increases when the rate of change of the characteristic indicative of the loads accumulated over time increases;
• and wherein the determined minimum wind thrust limit decreases when the rate of change of the characteristic indicative of the loads accumulated over time decreases;
• and
• controlling the one or more operational parameters of the wind turbine to keep a wind thrust on the wind turbine above the determined minimum wind thrust limit.