# US 11,905,931 B2 · Controller for a wind turbine

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- Number: US 11,905,931 B2
- Document ID: US11905931B2
- Status: Granted
- Kind: B2
- Application number: 17/601,203
- Filed: 2020-03-16
- Published: 2022-06-02
- Granted: 2024-02-20
- Earliest claimed: 2019-04-09
- Assignees: Siemens Gamesa Renewable Energy A/S
- Applicants: Siemens Gamesa Renewable Energy A/S
- Inventors: Per Egedal; Michael Stoettrup
- Web page: https://patentgrep.com/patent/US11905931B2

## CPC

- F03D 7/0272: {by measures acting on the electrical generator}
- F03D 7/0276: {controlling rotor speed, e.g. variable speed}
- F03D 7/028: {controlling wind motor output power}
- H02P 9/04: Control effected upon non-electric prime mover and dependent upon electric output value of the generator
- F05B 2220/706: an electrical generator
- F05B 2270/1033: Power (if explicitly mentioned)
- H02P 2101/15: for wind-driven turbines
- 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

Provided is controller for a wind turbine including a power controller unit for controlling a power output of an electric generator included in the wind turbine. The power controller unit operates the electric generator according to a speed reference value and a power reference value, the speed reference value and a power reference value being chosen along a linear operating trajectory in a power vs speed graph, the linear operating trajectory including a point corresponding to the nominal power and the nominal generator speed. The power controller unit includes a slider command for selecting the angular position of the linear operating trajectory in the power vs speed graph.

## Claims

### Claim 1

A controller for a wind turbine, the controller comprising a power controller unit for controlling a power output of an electric generator comprised in the wind turbine, the power controller unit operating the electric generator according to a speed reference value and a power reference value, the speed reference value and the power reference value being chosen along a linear operating trajectory in a power vs speed graph, the linear operating trajectory including a point corresponding to the nominal power and the nominal generator speed, wherein the power controller unit includes a slider command for selecting an angular position of the linear operating trajectory in the power vs speed graph,
wherein the linear operating trajectory is movable in the power vs speed graph between a vertical operating trajectory and an inclined operating trajectory, an angle being provided between the vertical operating trajectory and the inclined operating trajectory, the value of the angle being selectable through the slider command of the power controller unit between 0° and 90°.

### Claim 2 (depends on 1)

The controller according to claim 1, wherein the inclined operating trajectory is chosen in order to provide a constant torque measured on the electric generator.

### Claim 3 (depends on 1)

The controller according to claim 1, wherein the inclined operating trajectory is chosen in order to avoid operating at rotational speeds corresponding to structure Eigenvalues of the wind turbine.

### Claim 4 (depends on 1)

The controller according to claim 1, wherein the inclined operating trajectory is chosen in order to provide a maximum power of the electric generator at each speed reference value.

### Claim 5 (depends on 1)

The controller according to claim 1, wherein the angular position of the operating trajectory is changed before the power reference value and/or the speed reference value is reached on the power vs speed graph.

### Claim 6 (depends on 1)

A wind turbine including an electric generator and the controller according to claim 1.

### Claim 7 (depends on 1)

A wind park including a plurality of wind turbines and the controller according to claim 1.

### Claim 8 (depends on 7)

The wind park according to claim 7, wherein the wind park includes a park level controller adjusting the operational trajectory in each turbine based on a park level operation mode.

### Claim 9

A method of controlling operation in a wind turbine, the method comprising:
operating an electric generator of the wind turbine according to a speed reference value and a power reference value, the speed reference value and the power reference value being chosen along a linear operating trajectory in a power vs speed graph, the linear operating trajectory including a point corresponding to the nominal power and the nominal generator speed, and
selecting an angular position of the linear operating trajectory in the power vs speed graph,
wherein the linear operating trajectory is movable in the power vs speed graph between a vertical operating trajectory and an inclined operating trajectory, an angle being provided between the vertical operating trajectory and the inclined operating trajectory, the method including selecting a value of the angle between 0° and 90°.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the inclined operating trajectory is chosen in order to provide a constant torque measured on the electric generator.

### Claim 11 (depends on 9)

The method according to claim 9, wherein the inclined operating trajectory is chosen in order to avoid operating at rotational speeds corresponding to structure Eigenvalues of the wind turbine.

### Claim 12 (depends on 9)

The method according to claim 9, wherein the inclined operating trajectory is chosen in order to provide a maximum power of the electric generator at each speed reference value.