Abstract: The present invention relates to a wind-velocity-field measurement system for use in a wind turbine having a rotor with two or more blades, comprising at least one sensor-signal obtained by measuring a physical quantity on at angle least one of the blades, the physical quantity being indicative of at least one wind-velocity-field characteristic; a table (140, 142, 144) build for a plurality of wind conditions by associating values characterizing the at least one sensor-signal with values of the at least one wind-velocity-field characteristic, and; searching means (150, 152, 154) for determining from the table a value of the at least one wind-velocity-field characteristic for a current wind condition given values characterizing the at least one sensor-signal.

Abstract: The present disclosure relates to a rotor for a wind turbine (1), having a rotor hub (8), having at least one rotor blade (9) mounted on the rotor hub (8) so as to be rotatable about a blade axis (11). At least one threaded spindle mechanism (13) is positioned between the rotor hub (8) and the rotor blade (9) and is connected both to the rotor hub (8) and the rotor blade (9). The rotor blade (9) is adapted to be rotated relative to the rotor hub (8) about the blade axis (11) by means of an actuation of the threaded spindle mechanism (13). The threaded spindle mechanism (13) has a drive (22), an actuating element (31), a spindle nut (18) detachably coupled to the actuating element (31), and a threaded spindle (19) which can be rotated about the longitudinal axis (25) thereof by means of the drive (22) and which is detachably coupled to the drive (22), such that the threaded spindle (19) and the spindle nut (18) can be separated from the threaded spindle mechanism (13).

Abstract: Disclosed is a wind turbine having a nacelle (20), a rotor (1) that is mounted on the nacelle (20) so as to be rotatable about a rotor axis (12). The rotor (1) includes a rotor hub (2) and multiple rotor blades (3, 4, 5), each of which extends in the direction of a blade axis (13, 14, 15) running transversely or substantially transversely to the rotor axis (12) and is mounted on the rotor hub (2) so as to be rotatable about the respective blade axis (13, 14, 15). The rotor (1) further includes at least one switchgear cubicle (9, 10, 11) per rotor blade (3, 4, 5). An electric circuit (23, 24, 25) for actuating at least one blade angle adjustment drive (26, 27, 28), by means of which the respective rotor blade (3, 4, 5) can be rotated about the blade axis (13, 14, 15) thereof, is arranged in said at least one switchgear cabinets (9, 10, 11). The switchgear cabinets (9, 10, 11) are combined to form a compact switchgear cabinet assembly (22) which sits radially centered within the rotor hub (2).

Abstract: The invention relates to a method for controlling a wind power plant having a rotor (5) driven by wind and rotating about a horizontal or substantially horizontally aligned rotor axis (6). The rotor includes a plurality of rotor blades (1, 2, 3), each extending in the direction of a blade axis (11, 12 13) which is perpendicular or substantially perpendicular to the rotor axis and about which the respective rotor blade (1, 2, 3) is rotated, wherein the rotor (5) is rotated about a vertical or substantially vertically aligned yaw axis (8) having a yaw angle velocity (?), whereby gyroscopic loads are generated on the rotor blades (1, 2, 3), and wherein the gyroscopic loads on the rotor blades (1, 2, 3) are reduced by rotating the rotor blades (1, 2, 3) about the blade axes (11, 12, 13) thereof depending on the yaw angle velocity (?) or a guide variable (?c) influencing said velocity.

Abstract: An electric drive has at least one electric motor and a power converter feeding electrical motor current thereto. A current desired-value emitter generates a reference signal. An additional circuit is coupled to the current desired-value emitter so as to receive the reference signal and generates a current desired-value signal. A current regulator is coupled to the additional circuit so as to receive the current desired-value signal. The current regulator generates a control signal to the power converter so as to regulate the motor current as a function of the current desired-value signal. The additional circuit has a first mode wherein the current desired-value signal corresponds to the reference signal and a second mode wherein the current desired-value signal is a pulsed signal.

Abstract: The invention relates to a method for examining an electric energy accumulator (31) for a blade angle adjustment drive (14) of a wind turbine (1), comprising an inverter (21), at least one electric motor (20) which is fed by the inverter (21) and the energy accumulator (31). Said electric motor (20) is blocked, the energy accumulator (31) is charged by the blocked electric motor (20) by means of the inverter (21) and the discharging of the thus charged energy accumulator (31) is observed.

Abstract: Disclosed is a method for operating a rotor blade adjustment drive for a wind turbine, in which an electric working load (23) is powered by an electric primary power supply (26) and, in case of a failure of said primary power supply (26), by an electricity accumulator (20). The accumulator (20) is charged by an electric charger (22). Furthermore, the accumulator (20) is temporarily disconnected from the charger (22) at successive intervals, and an electric test load (30) is applied thereto, the resulting electric discharge of the accumulator (20) being observed.

Abstract: The invention relates to an emergency power supply device for a rotor blade adjustment system (10) of a wind turbine (1), comprising a plurality of electric power accumulators (16, 17, 18), an electric charging unit (20) and an electric circuit arrangement (19) by means of which the charging unit (20) can be electrically coupled to a plurality of the power accumulators (16, 17, 18), one or more additional charging units (21, 23) being provided such that the number of charging units corresponds to the number of power accumulators. The circuit arrangement (19) can be used to electrically couple each of the charging units (20, 21, 22) to a plurality of power accumulators (16, 17, 18) and each of the power accumulators (16, 17, 18) to a plurality of charging units (20, 21, 22).

Abstract: A blade angle adjustment drive for a wind power plant having an electrical converter, an electric motor electrically coupled to the converter, and a monitoring unit which monitors the operation of the converter and identifies a malfunction in the operation of the converter. The operation of the converter may be interrupted at least temporarily based on the malfunction. An interruption prevention unit is selectively operable to prevent an interruption in the operation of the converter by the monitoring unit when the bade angle adjustment drive is in an emergency operation state.

Abstract: The invention relates to a blade pitch controlling drive for a wind turbine, comprising an electrical converter, an electric motor that is electrically coupled to the converter, a monitoring unit operable to monitor an electric output current supplied by the converter to the electric motor and determine a state of the load on the converter as a function of the electrical output current, a current limiting unit operable to reduce a maximum possible output current to a nominal current when the state of the load is an overload state when the nominal current when in a non-overload state, and a peak current control unit that can be activated. When activated, the peak current may be provided as the maximum possible output current, regardless of the load state of the inverter at the time of the activation.