Method and arrangement for controlling a wind turbine

摘要

It is described a method and an arrangement for controlling a wind turbine (811) having a rotor (813) and being connected to a utility grid (831), the method comprising: increasing a rotational speed (205) of the rotor from a typical rotational speed (209, 505) to an increased rotational speed (211, 507).

主权项

1. A method for controlling a wind turbine having a rotor and being connected to an electrical utility grid, the method comprising:
receiving an indication of a first level of a power demand from the utility grid; operating the wind turbine within a first range of wind speeds at a first speed of rotor rotation and a first angle of a blade pitch that generates a first level of a power output that matches the first level of the power demand; receiving an indication from the utility grid of a decreased power demand that is less than the first level of power demand; reducing the power output to a second level that matches the decreased power demand by reducing a generator torque on the rotor while maintaining the first blade pitch angle within ±10%, thereby causing the rotor rotation to increase to a second rotation speed; maintaining a blade tip to wind speed ratio that is higher than optimum for a maximum coefficient of power until an increase in the power output is required; receiving an indication of an increased power demand from the utility grid that is greater than the decreased power demand; and increasing the power output to a third level that matches the increased power demand by increasing the generator torque on the rotor while holding the blade pitch within ±10% of the first blade pitch angle, causing the rotor rotation to decrease to a third rotation speed and extracting a kinetic energy of rotation from the rotor.