A method of controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected is provided, which method includes the steps of controlling at least one auxiliary device to increase its consumption of reactive power, wherein an auxiliary devic
A method of controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected is provided, which method includes the steps of controlling at least one auxiliary device to increase its consumption of reactive power, wherein an auxiliary device is a device used during normal operation of the wind turbine; and/or controlling at least one reactive power generating device to decrease its generation of reactive power, wherein a reactive power generating device is a device that generates reactive power during normal operation of the wind turbine. An overvoltage response arrangement adapted for controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected is also provided. A wind turbine having an overvoltage response arrangement and a wind park are also provided.
대표청구항▼
1. A method of controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected, which method comprises: controlling at least one auxiliary device to increase its consumption of reactive power, wherein said auxiliary device comprises a devi
1. A method of controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected, which method comprises: controlling at least one auxiliary device to increase its consumption of reactive power, wherein said auxiliary device comprises a device used for normal operation of the wind turbine; andcontrolling at least one reactive power generating device to decrease its generation of reactive power, wherein said at least one reactive power generating device comprises a device that generates reactive power for normal operation of the wind turbine. 2. The method according to claim 1, wherein the steps of controlling said at least one auxiliary device to increase consumption and of controlling said at least one reactive power generating device to decrease generation of reactive power are performed on the basis of a reactive power consumption capacity and a reactive power generation reduction capacity of said devices determined during normal operation of the wind turbine. 3. The method according to claim 1, further comprising activating an additional reactive power consumption device. 4. The method according to claim 1, wherein the method is performed to prevent a disconnection of the wind turbine from the grid. 5. The method according to claim 1, wherein said at least one auxiliary device and said at least one reactive power generating device are connected to a low-voltage bus of the wind turbine, and further comprising determining a reactive power absorption capacity of said auxiliary device on the basis of measuring a voltage at the low-voltage bus. 6. An overvoltage response arrangement adapted for controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected, which overvoltage response arrangement comprises: an overvoltage input for indicating an occurrence of an overvoltage event in the electricity grid;a controller for controlling at least one auxiliary device to increase its consumption of reactive power, wherein said at least one auxiliary device comprises a device used during normal operation of the wind turbine, and/or for controlling at least one reactive power generating device to decrease its generation of reactive power, wherein said at least one reactive power generating device comprises a device that generates reactive power during normal operation of the wind turbine; anda low-voltage bus and a plurality of reactive power consumption and/or generating devices connected to the low-voltage bus, said plurality including said at least one auxiliary device, wherein a power estimation unit of the overvoltage response arrangement determines the reactive power absorption capacity of said at least one auxiliary device of the wind turbine on the basis of a voltage measured at the low-voltage bus. 7. The overvoltage response arrangement according to claim 6, wherein the at least one reactive power generating device of the wind turbine comprises a PWM filter, and the overvoltage response arrangement is adapted to disconnect the PWM filter in response to the overvoltage event. 8. The overvoltage response arrangement according to claim 6, wherein the at least one auxiliary device of the wind turbine comprises any of: a pump of a cooling arrangement of the wind turbine, a dehumidifier of the wind turbine, and a lighting system of the wind turbine. 9. The overvoltage response arrangement according to claim 6, adapted to drive said at least one auxiliary device at essentially maximum power in response to the overvoltage event. 10. The overvoltage response arrangement according to claim 6, wherein the at least one reactive power generating device of the wind turbine comprises a wind turbine generator, and the overvoltage response arrangement is adapted to adjust a control parameter of the generator to reduce the reactive power output of the generator. 11. The overvoltage response arrangement according to claim 10, wherein the control parameter comprises a blade pitch angle, and the overvoltage response arrangement is adapted to decrease the blade pitch angle in response to the overvoltage event. 12. A wind park comprising a plurality of wind turbines connected to an electricity grid;a wind park controller for controlling the plurality of wind turbines;wherein the wind park comprises an overvoltage response arrangement according to claim 5 adapted to control a number of said at least one auxiliary device of a number of the wind turbines to increase their consumption of reactive power and/or to control a number of said at least one reactive power generating device of a number of the wind turbines to decrease their generation of reactive power in response to an overvoltage event in the electricity grid. 13. An overvoltage response arrangement adapted for controlling a wind turbine in response to an overvoltage event in an electricity grid to which the wind turbine is connected, which overvoltage response arrangement comprises: an overvoltage input for indicating an occurrence of an overvoltage event in the electricity grid; anda controller for controlling at least one auxiliary device to increase its consumption of reactive power, wherein said at least one auxiliary device comprises a device used during normal operation of the wind turbine, and/or for controlling at least one reactive power generating device to decrease its generation of reactive power, wherein said at least one reactive power generating device comprising a pulse width modulation (PWM) filter, and the overvoltage response arrangement is adapted to disconnect the PWM filter in response to the overvoltage event. 14. The overvoltage response arrangement according to claim 13, further comprising a low-voltage bus and a plurality of reactive power consumption and/or generating devices connected to the low-voltage bus, including said at least one auxiliary device, wherein a power estimation unit of the overvoltage response arrangement determines the reactive power absorption capacity of an auxiliary device of the wind turbine on the basis of a voltage measured at the low-voltage bus. 15. The overvoltage response arrangement according to claim 13, further comprising a power estimation unit for determining a reactive power absorption capacity of said at least one auxiliary device of the wind turbine during normal operation of the wind turbine. 16. The overvoltage response arrangement according to claim 13, further comprising a power estimation unit for determining a reactive power generation capacity of said at least one reactive power generating device of the wind turbine during normal operation of the wind turbine. 17. The overvoltage response arrangement according to claim 13, wherein the at least one auxiliary device of the wind turbine comprises any of: a pump of a cooling arrangement of the wind turbine, a dehumidifier of the wind turbine, a lighting system of the wind turbine. 18. The overvoltage response arrangement according to claim 13, adapted to drive said at least one auxiliary device at essentially maximum power in response to the overvoltage event.
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이 특허에 인용된 특허 (2)
Richardson Robert D. (San Ramon CA) Erdman William L. (Livermore CA), Variable speed wind turbine.
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