Controlling rotational speed by changing blade profile
AssigneeSiemens Gamesa Renewable Energy A/S
InventorsPer Egedal, Peder Bay Enevoldsen, Claus Vad
Life of this patent
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Abstract
Provided is a method of controlling a rotational speed of a rotor of a wind turbine having a rotor with blades connected thereon, at least one blade including a blade profile changing equipment, the method including: changing the blade profile dependent on a rotational speed deviation of an actual rotational speed of the rotor or the generator rotor from a reference rotational speed.
Claims11
A method of controlling a rotational speed of a rotor of a wind turbine having a rotor with a plurality of blades connected thereon, at least one blade of the plurality of blades including a blade profile changing equipment including a flap and/or a spoiler, the method comprising:
- changing a blade profile dependent on a rotational speed deviation of an actual rotational speed of the rotor or the generator rotor from a reference rotational speed, wherein changing the blade profile comprises:
- deriving, using a blade profile controller, a blade profile reference based on the rotational speed deviation, and adjusting the blade profile, using an actuator, based on the blade profile reference;
- determining a setting of the blade profile changing equipment;
- deriving a blade profile deviation of the blade profile reference, wherein the blade profile deviation is derived based on the difference between the determined setting of the blade profile changing equipment and the blade profile reference;
- supplying a pitch controller input signal to a pitch controller, wherein the pitch controller input signal is based on a plurality of signals addressing a plurality of conditions occurring during the method, the plurality of conditions including at least average wind speed changes, and rapid time changes of rotational speed deviation, wherein the pitch controller input signal is the sum of a plurality of signals, the plurality of signals comprising:
- a low pass filtering of the blade profile deviation;
- a low pass filtering of the determined setting of the blade profile changing equipment;
- and a rate excess of a rotational speed deviation rate, wherein the rotational speed deviation rate is a time change of the rotational speed deviation and the rate excess of the rotational speed deviation rate is the amount the rotational speed deviation rate is over a threshold rate;
- deriving, using the pitch controller, a pitch reference based on the pitch controller input signal;
- and,
- adjusting a pitch position of the at least one blade based on the pitch reference.
A system for controlling a rotational speed of a rotor of a wind turbine, having a rotor with a plurality of blades connected thereon, at least one blade including a blade profile changing equipment including a flap and/or a spoiler, the arrangement comprising:
- a processor configured to control changing the blade profile dependent on a rotational speed deviation of an actual rotational speed of the rotor or the generator rotor from a reference rotational speed, wherein changing the blade profile comprises:
- deriving, using a blade profile controller, a blade profile reference based on the rotational speed deviation, and adjusting the blade profile, using an actuator, based on the blade profile reference;
- wherein the processor k further configured to:
- determine a setting of the blade profile changing equipment;
- derive a blade profile deviation of the blade profile reference, wherein the blade profile deviation is derived based on the difference between the determined setting of the blade profile changing equipment and the blade profile reference;
- supply a pitch controller input signal to a pitch controller, wherein the pitch controller input signal is based on a plurality of signals addressing a plurality of conditions, the plurality of conditions including at least average wind speed changes and rapid time changes of rotational speed deviation, wherein the pitch controller input signal is the sum of a plurality of signals, the plurality of signals comprising:
- a low pass filtering of the blade profile deviation;
- a low pass filtering of the determined setting of the blade profile changing equipment;
- and a rate excess of a rotational speed deviation rate, wherein the rotational speed deviation rate k a time change of the rotational speed deviation and the rate excess of the rotational speed deviation rate k the amount the rotational speed deviation rate k over a threshold rate;
- derive, using the pitch controller, a pitch reference based on the pitch controller input signal;
- and adjust a pitch position of the at least one blade based on the pitch reference.
Dependencies are inferred from the claim text.