Method for operating a wind turbine

1. A method for operating a wind turbine, comprising:

generating at least one temperature information indicating the temperature of at least one component of the wind turbine,

generating at least one climatic information concerning prospective climatic conditions, wherein the at least one climatic information is temperature;

determining, using said temperature information and said climatic information, at least one material property information indicating at least one component specific, temperature dependent mechanical property of the at least one component of the wind turbine, wherein the temperature dependent mechanical property is temperature dependent yield strength, and

adjusting at least one operational parameter of the wind turbine in consideration of the at least one material property information.

2. The method according to claim 1 , wherein data specific to at least one component of the wind turbine concerning temperature dependency of at least one temperature dependent mechanical property is considered for determining material property information.

3. The method according to claim 1 , wherein the at least one temperature information is determined from an absolute temperature of the at least one component of the wind turbine and from simulations of the temperature of the at least one component of the wind turbine and from temperature relevant parameters of media surrounding the at least one component of the wind turbine.

4. The method according to claim 1 , wherein the at least one temperature information is determined from an absolute temperature of at least one further component of the wind turbine and from simulations of the temperature of the at least one further component of the wind turbine and from media surrounding the at least one further component of the wind turbine.

5. The method according to claim 4 , wherein, when generating at least one material property information for a number of components, a maximum allowable rotational speed is adjusted under consideration of the at least one material property information of a component encountering the highest decrease in mechanical properties.

6. The method according to claim 1 , wherein adjusting the at least one operational parameter of the wind turbine includes adjusting a maximum allowable rotational speed of a wind turbine rotor hub having a plurality of rotor blades attached thereto.

7. The method according to claim 6 , wherein the maximum allowable rotational speed of the wind turbine rotor hub is lowered in relation to a rotational speed reference value if the at least one temperature information indicates that the temperature of the at least one component of the wind turbine exceeds or approaches a component specific threshold temperature.

8. The method according to claim 1 , further comprising a second climatic information concerning current or prospective climatic conditions, wherein the second climatic information includes air density and/or wind speed.

9. A wind turbine, comprising:

a plurality of components,

a plurality of temperature sensors allocated to respective components of the wind turbine, and

at least one control unit that:

generates at least one temperature information indicating a temperature of at least one component of the wind turbine,

generates at least one climatic information concerning prospective climatic conditions, wherein the at least one climatic information is temperature;

determines, using said temperature information and said at climatic information, at least one material property information indicating at least one component specific, temperature dependent mechanical property of the at least one component of the wind turbine, wherein the temperature dependent mechanical property is temperature dependent yield strength, and

adjusts at least one operational parameter of the wind turbine in consideration of the at least one material property information.

10. The wind turbine according to claim 9 , wherein the wind turbine is a direct drive wind turbine.