# US 9,518,561 B2 · Method for the operation of a wind turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,561 B2 - Document ID: US9518561B2 - Status: Granted - Kind: B2 - Application number: 13/642,112 - Filed: 2011-04-12 - Published: 2013-05-02 - Granted: 2016-12-13 - Earliest claimed: 2010-04-19 - Assignees: Wobben Properties GmbH - Applicants: Wolfgang De Boer; Georg Eden; Alfred Beekmann; Gerhard Lenschow - Inventors: Wolfgang De Boer; Georg Eden; Alfred Beekmann; Gerhard Lenschow - Web page: https://patentgrep.com/patent/US9518561B2 ## CPC - F03D 7/0264: {for stopping; controlling in emergency situations (orientating out of wind F03D7/0208)} - F03D 1/0675: {of the blades} - F03D 7/045: {with model-based controls} - F03D 7/048: {controlling wind farms} - F03D 80/40: Ice detection; De-icing means - F03D 80/60: Cooling or heating of wind motors - F05B 2260/20: Heat transfer, e.g. cooling - F05B 2270/32: Wind speeds - F05B 2270/325: Air temperature - F05B 2270/335: Output power or torque - Y02E 10/72: Wind turbines with rotation axis in wind direction - F03D: WIND MOTORS - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The invention relates to a method for operating a wind turbine comprising an aerodynamic rotor that has at least one rotor blade. Said method comprises the steps of operating the wind turbine at an operating point that depends on the wind speed, detecting an operating parameter of the operating point, comparing the detected operating parameter with a predetermined reference quantity, and heating the at least one rotor blade when the detected operating parameter exceeds a predetermined variation from the reference quantity, the operation of the wind turbine being continued. ## Claims ### Claim 1 A method of operating a wind power installation having an aerodynamic rotor with at least one rotor blade, the method comprising: operating the wind power installation at an operating point dependent on the wind speed; detecting an operating parameter of the operating point, wherein the detected operating parameter is electric power being generated by the wind power installation; comparing the detected operating parameter to a first tolerance range and a second tolerance range of a reference parameter, the first tolerance range being within the second tolerance range; heating the at least one rotor blade in response to the detected operating parameter being outside of the first tolerance range and within the second tolerance range, while continuing the operation of the wind power installation; and stopping or shutting down the wind power installation in response to the detected operating parameter being outside of the first tolerance range and the second tolerance range. ### Claim 2 (depends on 1) The method according to claim 1, wherein the wind power installation is at least one of stopped and powered down, the method further comprising: restarting the wind power installation; detecting the operating parameter of the operating point for a period of time; comparing the detected operating parameter for the period of time to the second tolerance range; and at least one of stopping and powering down the wind power installation when the detected operating parameter for the period of time is outside of the second tolerance range over the period of time. ### Claim 3 (depends on 1) The method according to claim 1, further comprising detecting wind speed proximate the wind power installation, wherein the reference parameter depends on the detected wind speed. ### Claim 4 (depends on 1) The method according to claim 1 wherein heating the at least one rotor blade comprises blowing heated air through the rotor blade. ### Claim 5 (depends on 4) The method according to claim 4 wherein blowing heated air through the rotor blade comprises blowing heated air through a conduit in the rotor blade. ### Claim 6 (depends on 1) The method according to claim 1, further comprising: detecting a temperature at or proximate the wind power installation; and at least one of stopping and powering down the wind power installation when the detected temperature exceeds a threshold minimum temperature and when the detected operating parameter exceeds a threshold deviation relative to the reference parameter. ### Claim 7 (depends on 1) The method according to claim 1 wherein heating the at least one rotor blade comprises heating the at least one rotor blade when the detected operating parameter exceeds a threshold deviation for a threshold amount of time. ### Claim 8 A wind power installation comprising: a rotor having at least one rotor blade that includes a main portion and an end portion, wherein the main portion includes an air guide conduit configured to deliver heated air through the main portion to an interior of the end portion; a heating device; a blower; and a control unit configured to detect electric power generated by the wind power installation and to compare the detected electric power to first and second threshold reference parameters, the control unit configured to, in a first operation, activate the heating device and the blower in response to the detected electric power exceeding a deviation of the first threshold reference parameter and to cause heated air to blow through the air guide conduit of the main portion of the at least one rotor blade while the wind power installation is in operation, the control unit configured to, in a second operation, power down the wind power installation in response to the detected electric power exceeding a deviation of the second threshold reference parameter. ### Claim 9 (depends on 8) The wind power installation according to claim 8 further comprising an anemometer configured to measure wind speed proximate the rotor, wherein the first and second threshold reference parameters are dependent on wind speed. ### Claim 10 (depends on 8) The wind power installation of claim 8 wherein the control unit is configured to activate the heating device and the blower in response to the detected electric power exceeding the deviation of the threshold reference parameter for a threshold period of time. ### Claim 11 A method of operating a wind power installation comprising an aerodynamic rotor having at least one rotor blade, the method comprising: monitoring whether there is icing on the wind power installation by measuring the electric power generated by the wind power installation; and when the electric power passes a first threshold, heating the at least one rotor blade, while operation of the wind power installation is continued, and when the electric power passes a second threshold that is less than the first threshold, powering down the wind power installation. ### Claim 12 A method of operating a wind park comprising a plurality of mutually communicating wind power installations, each of the wind power installations comprising an aerodynamic rotor having at least one rotor blade, the method comprising: monitoring whether there is icing on at least one of the wind power installations by measuring the electric power generated by the at least one of the wind power installations; and when the electric power passes a first threshold, heating the at least one rotor blade of each of the wind power installations in the wind park, while operation of each of the wind power installations of the wind park is continued, and when the electric power passes a second threshold that is less than the first threshold, powering down the wind power installation.