초록 ▼

A wind power generation system 10 of an embodiment includes a rotor 40 having a hub 41 and blades 42, a nacelle 31 pivotally supporting the rotor 40, a tower 30 supporting the nacelle 31, an airflow generation device 60 provided in a leading edge of each of the blades 42 and having a first electrode

A wind power generation system 10 of an embodiment includes a rotor 40 having a hub 41 and blades 42, a nacelle 31 pivotally supporting the rotor 40, a tower 30 supporting the nacelle 31, an airflow generation device 60 provided in a leading edge of each of the blades 42 and having a first electrode 61 and a second electrode 62 which are separated via a dielectric, and a discharge power supply 65 capable of applying a voltage between the electrodes of the airflow generation device 60. Further, the system includes a measurement device detecting information related to at least one of output in the wind power generation system 10, torque in the rotor 40 and a rotation speed of the blades 42, and a control unit 110 controlling the discharge power supply 65 based on an output from the measurement device.

대표청구항 ▼

1. A wind power generation system, comprising: a rotor having a hub and at least two or more blades attached to the hub;a nacelle pivotally supporting the rotor via a rotation shaft connected to the hub;a tower supporting the nacelle;an airflow generation device provided in a leading edge of each of

1. A wind power generation system, comprising: a rotor having a hub and at least two or more blades attached to the hub;a nacelle pivotally supporting the rotor via a rotation shaft connected to the hub;a tower supporting the nacelle;an airflow generation device provided in a leading edge of each of the blades, the airflow generation device having: a first electrode disposed along a surface of the leading edge;a second electrode disposed along the surface of the leading edge; anda dielectric configured to separate the first electrode and the second electrode, the first electrode and the second electrode being configured to generate plasma induced flow from the leading edge along the blade;a voltage application mechanism configured to apply a voltage between the first electrode and the second electrode of the airflow generation device;a storage configured to store a prescribed data related to at least one of a set output of the wind power generation system, a set torque in the rotor, or a set rotation speed of the blades;a measurement device configured to detect a measurement data related to at least one of an actual output in the wind power generation system, an actual torque in the rotor, or an actual rotation speed of the blades; and a control unit configured to compare the prescribed data and the measurement data so as to control the voltage application mechanism. 2. The wind power generation system according to claim 1, wherein, when the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device is lower for a predetermined time period than the set output in the wind power generation system, the set torque in the rotor, or the set rotation speed of the blades stored in the storage at an axial wind velocity when the actual output, the actual torque, or the actual rotation speed is detected, the control unit controls the voltage application mechanism to apply the voltage between the first electrode and the second electrode so as to generate plasma induced flow. 3. The wind power generation system according to claim 2, wherein, when the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device while the plasma induced flow is generated reaches for a predetermined time period the set output in the wind power generation system, the set torque in the rotor, or the set rotation speed of the blades stored in the storage at an axial wind velocity when the actual output, the actual torque, or the actual rotation speed is detected, the control unit controls the voltage application mechanism to stop applying the voltage between the first electrode and the second electrode. 4. The wind power generation system according to claim 1, wherein the control unit controls the voltage application mechanism to apply the voltage between the first electrode and the second electrode for a predetermined time period and compares the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device before and after applying the voltage; andwherein, when the actual output, the actual torque, or the actual rotation speed detected by the measurement device is increased by the application of the voltage, the control unit controls the voltage application mechanism further for a predetermined time period to apply the voltage between the first electrode and the second electrode so as to generate plasma induced flow. 5. The wind power generation system according to claim 1, wherein a plurality of the airflow generation devices are provided in a blade span direction in leading edges of the blades, and the plurality of the airflow generation devices are controlled independently. 6. The wind power generation system according to claim 1, wherein, in the case where a plurality of the airflow generation devices are provided in a blade span direction in leading edges of the blades, and the plurality of the airflow generation devices are controlled independently, when the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device is lower for a predetermined time period than the set output in the wind power generation system, the set torque in the rotor, or the set rotation speed of the blades stored in the storage at an axial wind velocity when the actual output, the actual torque, or the actual rotation speed is detected, the control unit calculates an angle of attack in each blade leading edge where each of the airflow generation devices is provided based on a wind velocity and the actual rotation speed of the blades; and wherein, when a calculated angle of attack is larger than an angle of attack in each blade leading edge set in advance at a wind velocity and the actual rotation speed of the blades when this angle of attack is calculated, the control unit controls the voltage application mechanism to selectively apply a voltage between the first electrode and the second electrode provided in the blade leading edge for which the calculated angle of attack is larger than the angle of attack set in advance. 7. The wind power generation system according to claim 1, wherein, in the case where a plurality of the airflow generation devices are provided in a blade span direction in leading edges of the blades, and the plurality of the airflow generation devices are controlled independently, the control unit controls the voltage application mechanism to apply the voltage between the first electrode and the second electrode for a predetermined time period and compares the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device before and after applying the voltage, and when the actual output, the actual torque, or the actual rotation speed detected by the measurement device is increased by the application of the voltage, the control unit calculates an angle of attack in each blade leading edge where each of the airflow generation devices is provided based on a wind velocity and the actual rotation speed of the blades; andwherein, when a calculated angle of attack is larger than an angle of attack in each blade leading edge set in advance at a wind velocity and the actual rotation speed of the blades when this angle of attack is calculated, the control unit controls the voltage application mechanism to selectively apply a voltage between the first electrode and the second electrode provided in the blade leading edge for which the calculated angle of attack is larger than the angle of attack set in advance. 8. The wind power generation system according to claim 1, wherein the voltage applied by the voltage application mechanism is controlled to perform pulse modulation. 9. The wind power generation system according to claim 8, wherein the value of a relational expression fC/U is 0.1 or larger and 9 or smaller where f is a pulse modulation frequency of the voltage in the pulse modulation control, C is a chord length of the blades, and U is a relative velocity combining a peripheral velocity of the blades and a wind velocity. 10. A control method for a wind power generation system including a rotor having a hub and at least two or more blades attached to the hub, a nacelle pivotally supporting the rotor via a rotation shaft connected to the hub, a tower supporting the nacelle, and an airflow generation device provided in a leading edge of each of the blades, the airflow generation device having: a first electrode disposed along a surface of the leading edge, a second electrode disposed along the surface of the leading edge, and a dielectric configured to separate the first electrode and the second electrode, the first electrode and the second electrode being configured to generate induced flow from the leading edge of the blade, the control method comprising: detecting, by a measurement device, a measurement data related to at least one of an actual output in the wind power generation system, an actual torque in the rotor, or an actual rotation speed of the blades;comparing, by a control unit, the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades with a set output in the wind power generation system, a set torque in the rotor, or a set rotation speed of the blades set in advance at an axial wind velocity when the actual output, the actual torque, or the actual rotation speed is detected; andcontrolling, by the control unit, when the actual output, the actual torque, or the actual rotation speed detected by the measurement device is lower for a predetermined time period than the set output, the set torque, or the set rotation speed, a voltage application mechanism to apply a voltage between the first electrode and the second electrode so as to generate plasma induced flow. 11. The control method for the wind power generation system according to claim 10, the method further comprising: comparing by the control unit the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device after the plasma induced flow is generated with a second set output in the wind power generation system, a second set torque in the rotor, or a second set rotation speed of the blades set in advance at an axial wind velocity when the actual output, the actual torque, or the actual rotation speed detected by the measurement device after the plasma induced flow is generated is detected; andcontrolling by the control unit, when the actual output, the actual torque, or the actual rotation speed detected by the measurement device after the plasma induced flow is generated reaches for a predetermined time period the second set output, the second set torque, or the second set rotation speed, the voltage application mechanism to stop applying the voltage to the airflow generation device. 12. The control method for the wind power generation system according to claim 10, wherein the voltage applied by the voltage application mechanism is controlled to perform pulse modulation. 13. The control method for the wind power generation system according to claim 12, wherein the value of a relational expression fC/U is 0.1 or larger and 9 or smaller where f is a pulse modulation frequency of the voltage in the pulse modulation control, C is a chord length of the blades, and U is a relative velocity combining a peripheral velocity of the blades and a wind velocity. 14. The control method for the wind power generation system according to claim 10, in the case where a plurality of the airflow generation devices are provided in a blade span direction in leading edges of the blades, and the plurality of the airflow generation devices are controlled independently, the method comprising:comparing by the control unit the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device with the set output in the wind power generation system, the set torque in the rotor, or the set rotation speed of the blades set in advance at an axial wind velocity when the actual output, the actual torque, or the actual rotation speed is detected;calculating by the control unit, when the actual output, the actual torque, or the actual rotation speed detected by the measurement device is lower for a predetermined time period than the set output, the set torque, or the set rotation speed, an angle of attack in each blade leading edge where each of the airflow generation devices is provided based on a wind velocity and the actual rotation speed of the blades; andcontrolling by the control unit, when a calculated angle of attack is larger than an angle of attack in each blade leading edge set in advance at a wind velocity and the actual rotation speed of the blades when this angle of attack is calculated, the voltage application mechanism to selectively apply a voltage between the first electrode and the second electrode provided in the blade leading edge for which the calculated angle of attack is larger than the angle of attack set in advance, so as to generate plasma induced flow. 15. The control method for the wind power generation system according to claim 10, in the case where a plurality of the airflow generation devices are provided in a blade span direction in leading edges of the blades, and the plurality of the airflow generation devices are controlled independently, the method comprising: applying by the control unit the voltage between the first electrode and the second electrode for a predetermined time period and comparing the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device before and after applying the voltage;calculating by the control unit, when the actual output, the actual torque, or the actual rotation speed is increased by the application of the voltage, an angle of attack in each blade leading edge where each of the airflow generation devices is provided based on a wind velocity and the actual rotation speed of the blades; andcontrolling by the control unit, when a calculated angle of attack is larger than an angle of attack in each blade leading edge set in advance at a wind velocity and the actual rotation speed of the blades when this angle of attack is calculated, the voltage application mechanism to selectively apply a voltage between the first electrode and the second electrode provided in the blade leading edge for which the calculated angle of attack is larger than the angle of attack set in advance, so as to generate plasma induced flow. 16. The control method for the wind power generation system according to claim 10, the method further comprising: applying by the control unit the voltage between the first electrode and the second electrode for a predetermined time period and comparing the actual output in the wind power generation system, the actual torque in the rotor, or the actual rotation speed of the blades detected by the measurement device before and after applying the voltage; andcontrolling by the control unit, when the actual output, the actual torque, or the actual rotation speed is increased by the application of the voltage, the voltage application mechanism further for a predetermined time period to apply a voltage between the first electrode and the second electrode so as to generate plasma induced flow. 17. A wind power generation system, comprising: a rotor having a hub and at least two or more blades attached to the hub;a nacelle pivotally supporting the rotor via a rotation shaft connected to the hub;a tower supporting the nacelle;an airflow generation device provided in a leading edge of each of the blades, the airflow generation device having a first electrode and a second electrode which are separated via a dielectric, and capable of generating plasma induced flow;a voltage application mechanism capable of applying a voltage between the first electrode and the second electrode of the airflow generation device;a measurement device configured to measure a measured wind direction and a measured wind velocity and detect information related to at least one of output in the wind power generation system, torque in the rotor, or a rotation speed of the blades; anda control unit configured to control the voltage application mechanism based on an output from the measurement device,whereinthe control unit is configured to control the voltage application mechanism to adjust the output in the wind power generation system to a predetermined power curve thereof,the power curve represents a relation between an axial wind velocity and an output in the wind power generation system, andthe control unit is configured to calculate a calculated axial wind velocity based on the measured wind direction and the measured wind velocity so as to control the voltage application mechanism to adjust the output in the wind power generation system to a value on the power curve at the calculated axial wind velocity when the output in the wind power generation system deviates from the power curve.