# US 12,180,937 B2 · Wind turbine control for drivetrain load variations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,180,937 B2 - Document ID: US12180937B2 - Status: Granted - Kind: B2 - Application number: 17/911,983 - Filed: 2021-03-15 - Published: 2023-06-15 - Granted: 2024-12-31 - Earliest claimed: 2020-03-16 - Assignees: Vestas Wind Systems A/S - Applicants: Vestas Wind Systems A/S - Inventors: Jesper Sandberg Thomsen; Johannes Philippus Maree; Tobias Gybel Hovgaard; Peter Sloth-Odgaard - Web page: https://patentgrep.com/patent/US12180937B2 ## CPC - F03D 7/0272: {by measures acting on the electrical generator} - F03D 7/028: {controlling wind motor output power} - F03D 7/0298: {to prevent, counteract or reduce vibrations} - H02P 9/02: Details {of the control} - F05B 2270/1032: Torque - F05B 2270/1033: Power (if explicitly mentioned) - F05B 2270/327: Rotor or generator speeds - Y02E 10/72: Wind turbines with rotation axis in wind direction - F03D: WIND MOTORS - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - 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 control of a wind turbine to address varying drivetrain loading. This is obtained by determining a modification signal to be set as a control signal. A signal indicative of a speed of the electrical generator a signal indicative of a requested output power are received. The signal indicative of a speed is filtering to isolate frequencies in a selected disturbance frequency band to generate a disturbance signal. The disturbance signal is phase shifted and combined with a requested output power to obtain the modification signal. ## Claims ### Claim 1 A method of controlling a wind turbine, the wind turbine comprising (i) a rotor having one or more blades and (ii) an electrical generator, the rotor being connected to the electrical generator by a drivetrain, the method comprising: receiving a signal indicative of a speed of the electrical generator and receiving a signal indicative of a requested output power; filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band to generate a disturbance signal; phase shifting a phase of the disturbance signal to match a phase of torque variations of the rotor at the frequencies of the selected disturbance frequency band to generate a phase shifted signal; generating a modification signal based on a sum of the phase shifted signal and the signal indicative of the requested output power; and controlling the wind turbine using the modification signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the modification signal used to control the wind turbine is at least one of a power reference or a torque reference. ### Claim 3 (depends on 1) The method of claim 1, wherein prior to filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band, the signal indicative of the speed is filtered with a drivetrain notch filter, wherein the notch filter removes a resonant frequency of the drivetrain. ### Claim 4 (depends on 1) The method of claim 1, wherein the phase shifted signal is further modified with a signal gain. ### Claim 5 (depends on 4) The method of claim 4 wherein the signal gain comprises a term based on a wind speed. ### Claim 6 (depends on 4) The method of claim 4 wherein the signal gain comprises a term based on a rotor speed of the wind turbine. ### Claim 7 (depends on 4) The method of claim 4, further comprising: determining an electrical disturbance at a point of measurement electrically connecting the wind turbine to an electrical grid, wherein the signal gain comprises a term based on the determined electrical disturbance. ### Claim 8 (depends on 1) The method of claim 1, wherein the signal indicative of a speed of the electrical generator is based on an electrical generator speed signal, a rotor speed signal or a combination of the rotor speed signal and the generator speed signal. ### Claim 9 (depends on 1) The method of claim 1, wherein the signal indicative of a speed of the electrical generator is based on a rotational load signal of a rotor axis. ### Claim 10 (depends on 1) The method of claim 1 further comprising: predicting a trajectory of the signal indicative of the requested output power, where the trajectory comprises a time series of values indicative of the requested output power, and where the trajectory includes a predicted first control value; and setting the signal indicative of the requested output power based on the predicted first control value. ### Claim 11 A wind turbine control system comprising: a signal processing module comprising one or more processors programmed to perform an operation, the operation comprising: receiving a signal indicative of a speed of an electrical generator; filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band to generate a disturbance signal; phase shifting a phase of the disturbance signal to match a phase of torque variations of a rotor at the frequencies of the selected disturbance frequency band to generate a phase shifted signal; and the control system further being adapted to: receive a signal indicative of a requested output power; generate a modification signal based on a sum of the phase shifted signal and the signal indicative of the requested output power; and control the wind turbine using the modification signal. ### Claim 12 A computer program product comprising a non-transitory computer readable medium storing software code which, when executed, performs an operation to control a wind turbine comprising (i) a rotor having one or more blades and (ii) an electrical generator, the rotor being connected to the electrical generator by a drivetrain; the operation comprising: receiving a signal indicative of a speed of the electrical generator and receiving a signal indicative of a requested output power; filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band to generate a disturbance signal; phase shifting a phase of the disturbance signal to match a phase of torque variations of the rotor at the frequencies of the selected disturbance frequency band to generate a phase shifted signal; generating a modification signal based a sum of the phase shifted signal and the signal indicative of the requested output power; and controlling the wind turbine using the modification signal. ### Claim 13 (depends on 12) The program product of claim 12, wherein the modification signal used to control the wind turbine is at least one of a power reference or a torque reference. ### Claim 14 (depends on 12) The program product of claim 12, wherein prior to filtering the signal indicative of the speed to isolate frequencies in a selected disturbance frequency band, the signal indicative of the speed is filtered with a drivetrain notch filter, wherein the notch filter removes a resonant frequency of the drivetrain.