Vestas Wind Systems A/s

Jan Bjerre Christensen

Gerner Larsen

Søren Poul Jensen

Niels Martin Henriksen

Søren P Jensen

A method for performing maintenance on an outer surface of at least one wind turbine part, such as a tower (), a nacelle () or a wind turbine blade (), of an offshore wind turbine () is disclosed. An access system () is transported to a site of the offshore wind turbine (), and the access system () is transferred to a transition platform () at a lower part of the offshore wind turbine (), while operating the offshore wind turbine () in accordance with a normal operating mode. Normal operation of the offshore wind turbine () is then stopped, and maintenance is performed on an outer surface of at least one wind turbine part () of the offshore wind turbine (), using the access system (). When the maintenance has been completed, normal operation of the offshore wind turbine () is restarted in accordance with a normal operating mode. Normal operation of the offshore wind turbine () is only stopped while the actual maintenance takes place. Thereby the loss in power production is minimised.

Method for performing maintenance on a wind turbine part

A wind energy converter includes a wind turbine, a wind turbine foundation including a strengthening structure, and a temperature control mechanism for controlling the temperature of one or more areas of the wind turbine. The wind energy converter is characterized in that at least a part of the temperature control mechanism adjoins the strengthening structure. Also contemplated is a wind turbine foundation including a strengthening structure. The wind turbine foundation is characterized in that the foundation includes at least a part of a temperature control mechanism for heat exchanging with one or more areas of a wind turbine and in that at least a part of the temperature control mechanism adjoins the strengthening structure. Even further contemplated is a method for controlling the temperature of one or more areas of a wind turbine and use of a wind turbine foundation.

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Hinnerup, Denmark

Jan Bjerre Christensen