Abstract: Pitch control system (1) for at least one rotor blade (17) for a wind turbine comprising a nacelle (16), as well as a hub (15) both place on the top of a tower (18) and at least one rotor blade (17). The system comprises at least one electrical pitch drive system (3) each drive system (3) is connected to a rotor blade (17) and an electrical pitch motor (2). The electrical pitch drive system(s) (3) is/are adapted to communicate with units comprising the motor(s) (2) for pitching the rotor blade (17) it is attached to and in accordance with inputs registered from a first sensor and a second sensor (20). Each electrical pitch drive system (3) comprises a gyroscope (22) adapted to register an angle value of the longitudinal axis of the rotor blade (17) with respect to the gravity. A processor is adapted to calculate the position of the rotor blade (17) based on said values.

Abstract: A method for wind turbine tower damping is disclosed, as well as an associated controller and wind turbine. The method comprises determining, using one or more sensor signals, dynamic state information for a tower of a wind turbine during power production, wherein the dynamic state information comprises a tower frequency. The method further comprises determining at least one control loop gain value using the tower frequency, and generating, using the at least one control loop gain value, one or more control signals for controlling a rotational speed of a rotor of the wind turbine.

Abstract: Method for control of the torque performance of an electric pitch motor (1). A control system (2) comprises a first unit (3) controlling the pitch angle of the rotor blade, a second unit (7) which compares a reference speed Sr with an actual speed Sa of the motor (1) rotational speed. The second unit (7) controls the motor (1) rotational speed, a third unit (10) which regulates the motor (1). The control system (2) comprises a first overload device (13) and a second overload device (14). The second overload device (14) receives an error-speed signal Se, which is the difference between Sr and Sa recorded by the second unit (7). The second overload unit (14) compares See with a maximum allowable speed value, Smax, and the second overload device (14) sends a signal to the motor (1) for the regulation of the torque performance.

Abstract: Pitch system (1) comprising at least one pitch motor drive (3) connected an electrical network (5). Each pitch motor drive (3) is connected to a power bank, and the pitch system comprises a test module adapted to be activated in a test position. The test module comprises a brake module (8) each connected to a pitch motor drive (3), and each brake module (8) is adapted to load a pitch motor drive (3) with a certain load Rb. Hereby a voltage drop takes place over the power bank (6). The power bank (6) is separated into a number of power blocks (9) and the voltage drop ?V of each power block (9) is adapted to be registered by the test module when the brake module (8) is activated.

Abstract: Pitch control system (1) for at least one rotor blade (17) for a wind turbine comprising a nacelle (16), as well as a hub (15) both place on the top of a tower (18) and at least one rotor blade (17). The system comprises at least one electrical pitch drive system (3) each drive system (3) is connected to a rotor blade (17) and an electrical pitch motor (2). The electrical pitch drive system(s) (3) is/are adapted to communicate with units comprising the motor(s) (2) for pitching the rotor blade (17) it is attached to and in accordance with inputs registered from a first sensor and a second sensor (20). Each electrical pitch drive system (3) comprises a gyroscope (22) adapted to register an angle value of the longitudinal axis of the rotor blade (17) with respect to the gravity. A processor is adapted to calculate the position of the rotor blade (17) based on said values.

Abstract: Method for control of the torque performance of an electric pitch motor (1). A control system (2) comprises a first unit (3) controlling the pitch angle of the rotor blade, a second unit (7) which compares a reference speed Sr with an actual speed Sa of the motor (1) rotational speed. The second unit (7) controls the motor (1) rotational speed, a third unit (10) which regulates the motor (1). The control system (2) comprises a first overload device (13) and a second overload device (14). The second overload device (14) receives an error-speed signal Se, which is the difference between Sr and Sa recorded by the second unit (7). The second overload unit (14) compares See with a maximum allowable speed value, Smax, and the second overload device (14) sends a signal to the motor (1) for the regulation of the torque performance.

Abstract: Pitch system (1) comprising at least one pitch motor drive (3) connected an electrical network (5). Each pitch motor drive (3) is connected to a power bank, and the pitch system comprises a test module adapted to be activated in a test position. The test module comprises a brake module (8) each connected to a pitch motor drive (3), and each brake module (8) is adapted to load a pitch motor drive (3) with a certain load Rb. Hereby a voltage drop takes place over the power bank (6).