Pitch control of wind turbine blades in a standby mode
AssigneeVestas Wind Systems A/S
InventorsFabio Caponetti, Andre Brandao Martins
Life of this patent
Estimating the term…
Abstract
A method of operating a wind turbine generator comprising a plurality of blades, the method comprising iterating the following steps: comparing an indicated rotor speed with a rotor speed target to determine a rotor speed error; generating a modified rotor speed error by applying a control factor to the rotor speed error; controlling the pitch angle of the blades via a pitch control system in accordance with the modified speed error; and altering the control factor in dependence on a size of the indicated rotor speed.
Claims14
A method of operating a wind turbine generator comprising a rotor having a plurality of blades, the method comprising:
- comparing an indicated rotor speed with a rotor speed target to determine a rotor speed error;
- generating a modified rotor speed error by applying a control factor to the rotor speed error;
- controlling a pitch angle of each blade via a pitch control system in accordance with the modified speed error;
- altering the control factor in dependence on a size of the indicated rotor speed;
- and
- comprising decrementing the control factor when the indicated rotor speed is in a first range of rotor speeds, and wherein decrementing comprises decreasing the control factor by a first decrement when the indicated rotor speed is inside the first range of rotor speeds and is greater than the rotor speed target, and decreasing the control factor by a second decrement when the indicated rotor speed is inside the first range of rotor speeds and is less than the rotor speed target.
A control system for a wind turbine generator comprising a rotor having a plurality of blades, the control system being configured to:
- compare an indicated rotor speed with a rotor speed target to determine a rotor speed error;
- generate a modified rotor speed error by applying a control factor to the rotor speed error;
- control a pitch angle of each blade in accordance with the modified speed error;
- alter the control factor in dependence on a size of the indicated rotor speed;
- and
- decrement the control factor when the indicated rotor speed is in a first range of rotor speeds, wherein decrementing the control factor comprises decreasing by a first decrement when the indicated rotor speed is inside the first range of rotor speeds and is greater than the rotor speed target, and decreasing the control factor by a second decrement when the indicated rotor speed is inside the first range of rotor speeds and is less than the rotor speed target.
A controller, comprising:
- a memory containing instructions;
- a processor communicatively coupled to the memory and, which when programmed with the instructions, performs an operation of operating a wind turbine generator comprising a rotor having a plurality of blades, the operation comprising:
- comparing an indicated rotor speed with a rotor speed target to determine a rotor speed error;
- generating a modified rotor speed error by applying a control factor to the rotor speed error;
- controlling a pitch angle of each blade via a pitch control system in accordance with the modified speed error;
- altering the control factor in dependence on a size of the indicated rotor speed;
- and
- decrementing the control factor when the indicated rotor speed is in a first range of rotor speeds, and wherein decrementing comprises decreasing the control factor by a first decrement when the indicated rotor speed is inside the first range of rotor speeds and is greater than the rotor speed target, and decreasing the control factor by a second decrement when the indicated rotor speed is inside the first range of rotor speeds and is less than the rotor speed target.
Dependencies are inferred from the claim text.