The present invention relates to s wind turbine having a power generator for generating power for a first power line of a power grid; said wind turbine comprising a first transformer having a first primary coil connected to said power generator and a first secondary coil connected to said first powe
The present invention relates to s wind turbine having a power generator for generating power for a first power line of a power grid; said wind turbine comprising a first transformer having a first primary coil connected to said power generator and a first secondary coil connected to said first power line for transforming a first primary voltage (vp1) across said first primary coil to a first secondary voltage (vs1) across said first secondary coil; further, the wind turbine according to the invention comprises a first electric circuit connected to said first primary coil; said first electric circuit having a first switching element for providing a first current path parallel to said first primary coil if said first secondary voltage (vs1) exceeds a predetermined first voltage limit value.
대표청구항▼
The invention claimed is: 1. A wind turbine having a power generator for generating power for a first power line of a power grid, said wind turbine comprising: a first transformer having a first primary coil connected to said power generator and a first secondary coil connected to said first power
The invention claimed is: 1. A wind turbine having a power generator for generating power for a first power line of a power grid, said wind turbine comprising: a first transformer having a first primary coil connected to said power generator and a first secondary coil connected to said first power line for transforming a first primary voltage across said first primary coil to a first secondary voltage across said first secondary coil; and a first electric circuit connected to said first primary coil, said first electric circuit having a first switching element for providing a first current path parallel to said first primary coil if said first secondary voltage exceeds a predetermined first voltage limit value. 2. The wind turbine according to claim 1, further comprising: a second transformer having a second primary coil connected to said power generator and a second secondary coil connected to a second power line of said power grid for transforming a second primary voltage across said second primary coil to a second secondary voltage across said second secondary coil; and a second electric circuit connected to said second primary coil; said second electric circuit having a second switching element for providing a second current path parallel to said second primary coil if said second secondary voltage exceeds a predetermined second voltage limit value. 3. The wind turbine according to claim 2, further comprising: a third transformer having a third primary coil connected to said power generator and a third secondary coil connected to a third power line of said power grid for transforming a third primary voltage across said third primary coil to a third secondary voltage across said third secondary coil; and a third electric circuit connected to said third primary coil; said third electric circuit having a third switching element for providing a third current path parallel to said third primary coil if said third secondary voltage exceeds a predetermined third voltage limit value. 4. The wind turbine according to claim 3, wherein at least one of said first electric circuit, second electric circuit and third electric circuit comprises a respective first, second or third damping component for limiting the current of said respective first, second or third current path. 5. The wind turbine according to claim 4, wherein at least one of said first, second and third damping components is a resistor or an inductor connected in series with said respective first, second or third switching element. 6. The wind turbine according to claim 3, wherein at least one of said first, second and third switching elements is capable of interrupting said respective first, second or third current path if respective first, second or third secondary voltage falls below said respective predetermined first, second or third voltage limit value. 7. The wind turbine according to claim 3, wherein at least one of said first, second and third switching elements is capable of switching a current of more than 0.01% of the nominal maximal current of said respective first, second or third primary coil. 8. The wind turbine according to claim 3, wherein at least one of said first, second and third switching elements comprises at least one power semiconductor component comprising a power transistor, an insulated-gate bipolar transistor (IGBT), an integrated-gate communtated thyristor (IGCT), a gate-turn-off transistor (GTO), a thyristor, or a semiconductor controlled rectifier (SCR). 9. The wind turbine according to claim 3 whereby, wherein the switching of at least one of said first, second and third switching elements is controlled by a control unit that is capable of detecting when said respective first, second or third secondary voltage exceeds said respective predetermined first, second or third voltage limit value. 10. The wind turbine according to claim 3, wherein the first, second and third electric circuits are combined to have a single current path. 11. The wind turbine according to claim 7, wherein the at least one of said first, second and third switching elements is capable of switching a current of more than 0.1% of the nominal maximal current of said respective first, second or third primary coil. 12. The wind turbine according to claim 7, wherein the at least one of said first, second and third switching elements is capable of switching a current of more than 1% of the nominal maximal current of said respective first, second or third primary coil. 13. A method of operating a wind turbine having a first line for providing power to a first power line of a power grid via a transformer, the transformer having a primary coil connected to the first line and a secondary coil connected to the first power line, the method comprising: detecting a voltage across the secondary coil; connecting a first current path parallel to the first line to the primary coil in case that said voltage exceeds a predetermined first voltage limit value; and disconnecting said first current path from the primary coil in case that said voltage falls below said predetermined first voltage limit value. 14. The method according to claim 13, wherein said first current path is connected and disconnected by switching a switching element. 15. The method according to claim 14, wherein said switching element is a semiconductor component comprising a power transistor, an insulated-gate bipolar transistor (IGBT), an integrated-gate communtated thyristor (IGCT), a gate-turn-off transistor (GTO), a thyristor, or a semiconductor controlled rectifier (SCR).
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이 특허에 인용된 특허 (11)
Somerville William M. (Kirkwhelpington GB2), Electrical generator control system.
Siebenthaler, Eckardt; Andresen, Bj?rn; Feddersen, Lorenz, Variable speed wind turbine having a passive grid side rectifier with scalar power control and dependent pitch.
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