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A wind power turbine with a wind rotor which operates at variable speeds, a generator that can operate at a constant speed and an electric machine that can operate at a variable speeds, which are each in driving connection with one another by way of a superimposition transmission, such that as a pow

A wind power turbine with a wind rotor which operates at variable speeds, a generator that can operate at a constant speed and an electric machine that can operate at a variable speeds, which are each in driving connection with one another by way of a superimposition transmission, such that as a power control device for regulating the speed of the generator, the electric machine is connected to a power grid and operates as a generator and motor. A controllable brake, for braking the generator, is arranged in the force flow between the transmission and the generator to extend the operating range of the wind power turbine down to lower wind speeds. When operating the turbine at low wind speeds, the brake is applied, the generator is deactivated, and electric current is produced by operating the electric machine as a generator, which is fed to the power grid.

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1. A wind power turbine with a wind rotor (2) that is operable at variable speeds, a generator (3) that has an input shaft and the generator (3) being operable at a constant speed, andan electric machine (4) that is operable at variable speeds,the generator and the electric machine are in driving co

1. A wind power turbine with a wind rotor (2) that is operable at variable speeds, a generator (3) that has an input shaft and the generator (3) being operable at a constant speed, andan electric machine (4) that is operable at variable speeds,the generator and the electric machine are in driving connection with one another by way of a superimposition transmission (5) such that the electric machine (4) being operated as a power control device, either as a generator and as a motor, for regulating the speed of the generator (3),the electric machine (4) being connected to a power grid (14), via a frequency converter (15), for supplying the electric current to the power grid, via the frequency converter (15), when operating as a generator, and for receiving electric current from the power grid, via the frequency converter (15), when operating as a motor,a controllable holding brake (23) being arranged, in a power flow, between the superimposition transmission (5) and the generator (3), and the holding brake being actuatable, at low wind speed, to directly couple the driveshaft of the generator to a housing for braking and deactivating the generator (3) and preventing rotation of the generator (3), so that all electric current flowing to and from the power grid only flows through the frequency inverter (15) and the electric machine (4), andthe holding brake (23) being of an interlocking design. 2. The wind power turbine according to claim 1, wherein the holding brake (23) is a claw brake with a claw wheel arranged in a rotationally fixed manner on the driveshaft (21) of the generator, and a claw wheel mounted in a rotationally fixed manner on the housing, and one of the claw wheels is displacable, by an associated control device, toward the other claw wheel. 3. The wind power turbine according to claim 1, wherein the wind rotor (2) is connected to a main transmission (9) which is connected to the superimposition transmission (5). 4. The wind power turbine according to claim 1, wherein the superimposition transmission (5) comprises a sun gear (17), a planetary carrier (19) and a ring gear (20), the planetary carrier (19) is connected to the main transmission (9), the sun gear (17) is connected to a rotor (12) of the electric machine (4) and the ring gear (20) is continuously connected to the brake (23) and a rotor (10) of the generator (3). 5. The wind power turbine according to claim 1, wherein the brake (23), the generator (3) and the wind rotor (2) each communicate with a control unit (28) which engages the brake (23), such that at low wind speed, when the wind rotor (2) rotates at a speed lower than a rated rotor speed of the generator (3) the brake is engaged and the flow of power is transmitted only between the wind rotor (2) and the electric machine (4); and wherein the low wind speed is below a start-up value but above a minimum operating speed, such that the wind rotor (2) rotates at a speed lower than a fated rotor speed of the main generator (3). 6. A method of controlling operation of a wind power turbine that comprises a wind rotor (2) that is operable at variable speeds, a main generator (3) that is operable at constant speed and an electric machine (4) that is operable at variable speeds, which are in driving connection with one another by way of a superimposition transmission (5) such that the electric machine (4), as a power control device for regulating the speed of the main generator (3), being operable both as an additional generator and as a motor and being connected to a power grid (14) via a frequency converter (15), the method comprising the steps of: applying a controllable holding brake (23), at low wind speed, that is arranged between the superimposition transmission (5) and the main generator (3);deactivating the main generator (3) and operating the electric machine (4) as the additional generator to produce electric current; andsupplying the electric current to the power grid (14) via the frequency converter (15). 7. The method according to claim 6, further comprising the step of, at a wind speed which is lower than a start-up speed but above a minimum operating speed, accelerating the wind rotor (2) by operating the electric machine (4) as the motor at least until a minimum speed is reached and subsequently switching operation of the electric machine (4) into operation as the additional generator. 8. The method according to claim 6, further comprising the step of, before the holding brake is applied, synchronizing the holding brake (23) by operating the electric machine (4) as at least one of the additional generator and the motor. 9. The method according to claim 8, further comprising the step of synchronizing the holding brake (23), only when the wind rotor (2) is rotating, to avoid a tooth-on-tooth position of the holding brake (23) until a specified minimum speed difference is reached; and, when the wind rotor (2) is static, producing a minimum speed difference at the holding brake (23). 10. The method according to claim 6, further comprising the step of connecting the wind rotor (2) to a main transmission (9) which is connected to the superimposition transmission (5). 11. The method according to claim 6, further comprising the steps of forming the superimposition transmission (5) as a sun gear (17), a planetary carrier (19) and a ring gear (20), connecting the planetary carrier (19) to the main transmission (9), connecting the sun gear (17) to a rotor (12) of the electric machine (4) and connecting the ring gear (20), the brake (23) and a rotor (10) of the main generator (3). 12. The method according to claim 6, further comprising the step of the coupling the brake (23), the main generator (3) and the wind rotor (2) with a control unit (28) which engages the brake (23), when the wind rotor (2) rotates at a speed lower than a rated rotor speed of the main generator (3) such that the flow of power is transmitted only between the wind rotor (2) and the electric machine (4). 13. A wind power turbine comprising: a wind rotor (2) that is operated over a range of wind speeds,a main generator (3) having a hollow drive input shaft and being operated at constant speed, andan electric machine (4) having a central drive shaft which is surrounded by the hollow drive input shaft and the electric machine (4) being operated at a range of speeds;the wind rotor (2), the drive input shaft of the main generator (3) and the central drive shift of the electric machine (4) being coaxially aligned with one another along a rotational axis;a superimposition transmission (5) being axially located in a flow of power between the wind rotor (2) and the main generator (3);the wind rotor (2), the superimposition transmission (5), the main generator (3) and the electric machine (4) being interconnected to transmit the flow of power from the wind rotor (2) to at least one of the main generator (3) and the electric machine (4);the electric machine (4) being operable as an additional generator and a motor to regulate the rotational speed of the main generator (3);the main generator (3) being directly connected to a power grid (14) while the electric machine being connected to a power grid (14), via a frequency inverter (15);a brake (23) being permanently connected to the drive input shaft of the main generator and being axially located, in the flow of power, between the superimposition transmission (5) and the main generator (3), and the brake being actuated, at low wind speed, by a control unit to directly couple the drive input shaft of the main generator to a housing for braking rotation and deactivating of the main generator (3) and prevent rotation of the generator (3) so that all electric current flowing to and from the power grid only flows through the frequency inverter (15) and the electric machine (4). 14. The wind power turbine according to claim 13, wherein the wind rotor (2) is continuously connected to an input shaft of a main transmission (9) which is connected to the superimposition transmission (5). 15. The wind power turbine according to claim 14, wherein the superimposition transmission (5) is a planetary gearset comprises a sun gear (17), a planetary carrier (19) and a ring gear (20), the planetary carrier (19) is continuously connected to an output shaft of the main transmission (9), the sun gear (17) is continuously to the central drive shaft of the electric machine which is continuously connected to a rotor (12) of the electric machine (4) and the ring gear (20) is continuously connected to each of the drive input shaft of the main generator, the brake (23) and a rotor (10) of the main generator (3). 16. The wind power turbine according to claim 13, wherein the brake (23), the main generator (3) and the wind rotor (2) each communicate with a control unit (28) which engages the brake (23), when the wind rotor (2) rotates at a speed lower than a rated rotor speed of the main generator (3) such that the flow of power is transmitted only between the wind rotor (2) and the electric machine (4). 17. The wind power turbine according to claim 15, wherein the brake is axially located between the planetary gearset and the main generator and the main generator is axially located between the brake and the electric machine.