Method for predicting and controlling loads on a wind turbine and a wind turbine thereof

A wind turbine comprising a wind turbine tower, a nacelle arranged on top of the wind turbine tower, a rotor with at least two wind turbine blades rotatably arranged relative to the nacelle, and at least one controller configured to control the operation of the wind turbine and to change said operation between a first operating mode and at least a second operating mode, wherein the at least one controller is further configured to determine at least one load signal from at least one sensor arranged relative to at least one component of the wind turbine and to determine a damage rate based on this at least one load signal, wherein the damage rate is calculated by using an algorithm, wherein one or more design parameters of the wind turbine are used as variables in the algorithm and the at least one load signal of at least one component of the wind turbine is used as input for the algorithm, the at least one controller is further configured to determine a normalised damage rate by applying a first function to said damage rate, wherein the first function includes at least one line segment indicative of the amount of control action applied during a first transition phase, the at least one controller is further configured to change the operation of the wind turbine between a first operating mode where a zero amount of control action is applied and at least a second operating mode where a maximum amount of control action is applied, where the controller is configured to change the operation depending on the normalised damage rate by applying at least one control action to the wind turbine, and, wherein the at least one controller is configured to operate the wind turbine in the first transition phase between said first operating mode and said at least second operating mode, wherein the at least one controller is configured to gradually change the amount of control action applied as function of the normalised damage rate, wherein the gradual change is performed linearly, in steps, or in a non-linear manner.