WIND TURBINE HAVING A HTS GENERATOR WITH A PLURALITY OF PHASES
First Claim
1. A wind turbine comprising:
- a wind turbine tower having a top and a bottom;
a nacelle arranged on top of the wind turbine tower;
a rotor hub rotatably mounted to the nacelle;
one or more wind turbine blades mounted to the rotor hub, wherein the wind turbine blades define a rotor plane;
a shaft coupled to the rotor hub;
a generator coupled to the shaft, the generator having a rotor rotatably arranged in relation to a stator, the rotor comprising at least one superconducting rotor coil and the stator comprising at least one conductive stator coil, wherein the superconducting rotor coils and the stator coils have interacting magnetic fields inducing a current in the stator coil when the rotor is rotated;
at least one converter electrically coupled to the generator, the converter having a power grid side electrically connected to a generator side, the power grid side electrically coupled to a power grid having a predetermined grid code, and the generator side electrically coupled to the generator, wherein the converter converts output power from the generator so that it matches power of the power grid;
wherein the stator coils in the generator form two or more sets of stator coils for reducing a transient of an electromagnetic brake torque relative to a nominal electromagnetic torque of the generator, and wherein each set of stator coils forms a predetermined number of phases and wherein the at least one converter includes two or more converter modules each having a generator side and a power grid side, wherein the generator side of each converter module comprises a plurality of rectifying circuits electrically coupled to one of the sets of stator coils of the generator.
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Accused Products
Abstract
The present invention relates to a wind turbine having a wind turbine tower with a nacelle provided on the top to which a rotor hub with one or more wind turbine blades is rotatably mounted by a rotor shaft. A generator is arranged in the nacelle, wherein the superconducting rotor coils induce a current in the stator coils when the rotor is rotated, and wherein the stator coils are arranged in at least four phases. One or more converter modules convert the power output from the generator so that it matches the power of a power grid. The generator side of the converter modules comprises a number of rectifying circuits equal to the phases in the generator, while the power grid side comprises a number of inverting circuits equal to the phases of the power grid. This allows the transient of the electromagnetic brake torque relative to the nominal electromagnetic torque of the generator to be reduced. The ripples of the electromagnetic torque are also reduced since the switching frequency of the converter is increased. This in turn reduces the mechanical stresses occurring in the drive train in the event of a failure or error occurring in one of the converter modules. The present invention also relates to a method of operation of such a wind turbine where the defective converter module is selectively switched off and the wind turbine is put into operation again at a lower operation level.
38 Citations
10 Claims
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1. A wind turbine comprising:
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a wind turbine tower having a top and a bottom; a nacelle arranged on top of the wind turbine tower; a rotor hub rotatably mounted to the nacelle; one or more wind turbine blades mounted to the rotor hub, wherein the wind turbine blades define a rotor plane; a shaft coupled to the rotor hub; a generator coupled to the shaft, the generator having a rotor rotatably arranged in relation to a stator, the rotor comprising at least one superconducting rotor coil and the stator comprising at least one conductive stator coil, wherein the superconducting rotor coils and the stator coils have interacting magnetic fields inducing a current in the stator coil when the rotor is rotated; at least one converter electrically coupled to the generator, the converter having a power grid side electrically connected to a generator side, the power grid side electrically coupled to a power grid having a predetermined grid code, and the generator side electrically coupled to the generator, wherein the converter converts output power from the generator so that it matches power of the power grid; wherein the stator coils in the generator form two or more sets of stator coils for reducing a transient of an electromagnetic brake torque relative to a nominal electromagnetic torque of the generator, and wherein each set of stator coils forms a predetermined number of phases and wherein the at least one converter includes two or more converter modules each having a generator side and a power grid side, wherein the generator side of each converter module comprises a plurality of rectifying circuits electrically coupled to one of the sets of stator coils of the generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification