Wind turbine flutter suppression method and apparatus, and control system and wind turbine

Abstract

S100 a wind turbine and a wind direction S200

Description

[0147] This application further provides a control system for a wind turbine, including a controller and a pitch drive system. The pitch drive system is configured to receive an instruction of the controller and pitch blades of the wind turbine. The controller is configured to perform a wind turbine flutter suppression method as described above and output a control instruction to the pitch drive system.

[0148] This application further provides a wind turbine, including a control system for a wind turbine as described above.

[0149] In the embodiments provided by this application, it should be understood that the disclosed device and method may also be implemented in other manners. The above device embodiments are merely illustrative, for example, the flowcharts and structural diagrams in the accompanying drawings illustrate the architecture, functionality and operation of possible implementations of devices, methods and computer program products according to the embodiments of this application. In this regard, each block of the flowchart or block diagram may represent a module, a program segment, or a portion of a code that includes one or more executable instructions for implementing the specified logical functions. It should also be noted that in alternative implementations, the functions noted in the blocks may also occur in a different order from the one illustrated in the accompanying drawings. For example, two consecutive blocks may be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending upon the function involved. It should also be noted that each block of the structural diagram and / or flowchart, and a combination of blocks in the structural diagram and / or flowchart, may be implemented in a special hardware-based system that performs the specified function or action, or may be implemented by a combination of special hardware and computer instructions.

[0150] In addition, the functional modules or units in the embodiments of this application may be integrated to form a separate part, or each module may exist separately, or two or more modules may be integrated to form a separate part.

[0151] When the function is implemented in the form of a software function module or sold or used as a separate product, the software function module may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application essentially or for the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium and includes several instructions used for enabling a computer apparatus (which may be a smartphone, a personal computer, a server, a network apparatus or the like) to execute all or part of the steps of the methods of the embodiments of this application. The foregoing storage medium includes: a USB flash disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, or any medium that can store program codes.

[0152] The foregoing descriptions are merely specific implementations of this application, but the protection scope of this application is not limited thereto. Any variation or replacement readily figured out by those skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application.

Claims

1. A wind turbine flutter suppression method, comprising:determining a nacelle-wind direction angle between a nacelle direction of a wind turbine and a wind direction; anddetermining a pitching policy for changing pitch angles according to the nacelle-wind direction angle; wherein the pitching policy comprises a speed-controlled pitching scheme and a pitch-angle-sequence-controlled pitching scheme;wherein the speed-controlled pitching scheme comprises: regulating pitch angles of blades of the wind turbine according to a rotor speed of the wind turbine to keep the rotor speed within a preset speed range until flutter of the wind turbine is suppressed; andthe pitch-angle-sequence-controlled pitching scheme comprises: performing a pitching operation on the blades of the wind turbine according to a pitch angle sequence in preset pitching rules until the flutter of the wind turbine is suppressed.

2. The wind turbine flutter suppression method according to claim 1, wherein the determining the pitching policy for changing the pitch angles according to the nacelle-wind direction angle comprises:using the speed-controlled pitching scheme to change the pitch angles when the nacellewind direction angle is less than a first angle or the nacelle-wind direction angle is greater than or equal to a second angle; andusing the pitch-angle-sequence-controlled pitching scheme to change the pitch angles when the nacelle-wind direction angle is greater than or equal to the first angle and less than the second angle;wherein the first angle is in a range of greater than or equal to 40 degrees and less than or equal to 70 degrees; and the second angle is in a range of greater than or equal to 110 degrees and less than or equal to 140 degrees.

3. The wind turbine flutter suppression method according to claim 2, wherein the regulating the pitch angles of the blades of the wind turbine according to the rotor speed of the wind turbine to keep the rotor speed within the preset speed range comprises:detecting, each time after regulating the pitch angles of the three blades of the wind turbine, whether the rotor speed is within the preset speed range at an interval of a first preset detectiontime;wherein the preset speed range is between a first speed and a second speed;reducing, if detecting that the rotor speed is less than the first speed, the pitch angles of the three blades of the wind turbine by a preset regulation angle respectively; andincreasing, if detecting that the rotor speed is greater than the second speed, the pitch angles of the three blades of the wind turbine by the preset regulation angle respectively;wherein a relationship between the first speed and the second speed satisfies 0<first speed<second speed<12 rpm.

4. The wind turbine flutter suppression method according to claim 2, wherein the performing the pitching operation on the blades of the wind turbine according to the pitch angle sequence in the preset pitching rules comprises:pitching the three blades of the wind turbine to first sequence values in the pitch angle sequence; detecting whether the flutter of the wind turbine is suppressed at an interval of a second preset detection time;if not, performing the pitching operation on the three blades of the wind turbine in accordance with the preset pitching rules such that the pitch angles reach second sequence values in the pitch angle sequence;detecting, after the pitching operation, whether the flutter of the wind turbine is suppressed again at the interval of the second preset detection time; andif not, continuing performing the pitching operation on the three blades of the wind turbine in accordance with the preset pitching rules such that the pitch angles reach next sequence values in the pitch angle sequence;wherein the preset pitching rules comprise:the pitch angles of the three blades in the pitch angle sequence respectively increase or decrease in sequence; a difference between a maximum pitch angle and a minimum pitch angle of the same blade in the pitch angle sequence is greater than a maximum flutter-accumulating pitch angle interval span; andan absolute value of a difference between the adjacent sequence values of the pitch angles of the same blade in the pitch angle sequence is less than a minimum distance between flutteraccumulating pitch angle intervals.

5. The wind turbine flutter suppression method according to claim 4, wherein the maximum flutter-accumulating pitch angle interval span is greater than 60 degrees; and the minimum distance between flutter-accumulating pitch angle intervals is less than 35 degrees.

6. The wind turbine flutter suppression method according to claim 1, wherein the determining whether the flutter of the wind turbine is suppressed comprises:collecting a vibration signal of a tower vibration sensor or a blade vibration sensor on the wind turbine; performing spectrum analysis on the vibration signal, and extracting an amplitude-frequency component of the vibration signal in a band of 0.2 Hz to 3.0 Hz as an equivalent amplitude; anddetermining, if the equivalent amplitude is not greater than a preset value, that the flutter of the wind turbine is suppressed, wherein the preset value is in a range of 0.004 m / sA2<preset value<0.1 m / sA2.

7. The wind turbine flutter suppression method according to any of claims 1 to 6, wherein after the flutter of the wind turbine is suppressed, the method further comprises:controlling the three blades of the wind turbine to recover to a feathered position;wherein the feathered position refers to a position where the pitch angles are greater than or equal to 80 degrees and less than or equal to 95 degrees.

8. A wind turbine flutter suppression device, comprising:a calculation module, configured to determine a nacelle-wind direction angle between a nacelle direction of a wind turbine and a wind direction; anda determination module, configured to determine a pitching policy for changing pitch angles according to the nacelle-wind direction angle;wherein the pitching policy comprises a speed-controlled pitching scheme and a pitchangle-sequence-controlled pitching scheme;the speed-controlled pitching scheme comprises: regulating pitch angles of blades of the wind turbine according to a rotor speed of the wind turbine to keep the rotor speed within a preset speed range until flutter of the wind turbine is suppressed; andthe pitch-angle-sequence-controlled pitching scheme comprises: performing a pitching operation on the blades of the wind turbine according to a pitch angle sequence in preset pitching rules until the flutter of the wind turbine is suppressed.

9. A control system for a wind turbine, comprising a controller and a pitch drive system; whereinthe pitch drive system is configured to receive an instruction of the controller and pitch blades of the wind turbine; andthe controller is configured to perform a wind turbine flutter suppression method according to any of claims 1 to 7 and output a control instruction to the pitch drive system.

10. A wind turbine, comprising a control system for a wind turbine according to claim 9.

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