Method, controller and wind turbine generator set for suppressing blade vibration

Abstract

The present invention discloses a method, controller, and wind turbine generator set for suppressing blade vibration. The method comprises: obtaining a first blade vibration parameter under the operating condition of a yaw fault in the wind turbine generator set; determining whether the blade is in an aerodynamic vibration state based on the first blade vibration parameter; and controlling the wind turbine generator set to enter an electric operation mode in response to the blade being in the aerodynamic vibration state. In the electric operation mode, the generator of the wind turbine generator set outputs electromagnetic torque to drive the impeller to rotate, causing the blade to exit the aerodynamic vibration state. The embodiments of the present invention can effectively suppress blade vibration and prevent blade lifespan damage and breakage by adjusting the operating mode of the wind turbine generator set. The method has the advantages of simple operation and strong applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a method for suppressing blade vibration, a controller and a wind power generator set. Background Art

[0002] As wind turbine rotors become larger and larger, and blade designs become more flexible under cost pressure, stability control in the shutdown state becomes a design constraint for turbine safety. This is especially true when the turbine fails and cannot yaw to face the wind. A large area of ​​the blades is within the stall angle of attack range, and negative aerodynamic damping makes it difficult to attenuate the vibration amplitude of the blades in the swing direction. In the worst case, the blades will be damaged and their design life will be reduced. In the worst case, the blades will exceed their design load limit, leading to blade breakage and turbine tower collapse, resulting in economic and life safety losses.

[0003] Currently, shutdown stability control during yaw failure can be achieved by using net bags, canvas or other pneumatic accessories, but this method requires the removal of such accessories before the unit can resume operation, which brings engineering problems of installation and removal.

[0004] Only by adjusting the operating mode of the wind turbine can the purpose of effectively suppressing blade vibration and avoiding blade damage and breakage during its life be achieved. It has the advantages of simple operation and strong applicability. Summary of the Invention

[0005] The embodiments of the present invention provide a method, controller and wind turbine generator set for suppressing blade vibration, which can effectively suppress blade vibration and avoid blade damage and breakage over its life by adjusting the operating mode of the wind turbine generator set. It has the advantages of simple operation and strong applicability.

[0006] In a first aspect, an embodiment of the present invention provides a method for suppressing blade vibration, the method comprising:

[0007] Under the working condition of a yaw fault of the wind turbine generator set, obtaining a vibration parameter of a first blade;

[0008] determining, based on the first blade vibration parameter, whether the blade is in an aerodynamic vibration state;

[0009] In response to the blades being in the aerodynamic vibration state, the wind turbine generator set is controlled to enter the electric operation mode, wherein in the electric operation mode, the generator of the wind turbine generator set outputs electromagnetic torque to drive the impeller to rotate, so that the blades exit the aerodynamic vibration state.

[0010] In a possible implementation of the first aspect, the first blade vibration parameter includes: a cabin acceleration and blade accelerations corresponding to multiple blades; determining whether the blade is in an aerodynamic vibration state based on the first blade vibration parameter includes: determining whether the blade acceleration or the cabin acceleration corresponding to any blade is greater than a corresponding first acceleration threshold; in response to the blade acceleration or the cabin acceleration corresponding to any blade being greater than the corresponding first acceleration threshold, determining that the blade is in an aerodynamic vibration state.

[0011] In a possible implementation of the first aspect, the wind turbine generator set includes a semi-direct-drive wind turbine generator set, the semi-direct-drive wind turbine generator set includes a first converter, and the first converter is arranged between the power grid and the generator stator; controlling the wind turbine generator set to enter the electric operation mode includes: sequentially starting the grid-side power module and the machine-side power module of the first converter to make the wind turbine generator set enter the electric operation mode.

[0012] In a possible implementation of the first aspect, the wind turbine generator set includes a doubly-fed wind turbine generator set, which includes a second converter, a grid-connected contactor, and a short-circuit contactor. The second converter is arranged between the power grid and the generator rotor, the moving contact group of the grid-connected contactor is connected to the power grid, and the static contact group of the grid-connected contactor is connected to the generator stator and the moving contact group of the short-circuit contactor, respectively. Controlling the wind turbine generator set to enter the electric operation mode includes: closing the short-circuit contactor to disconnect the electrical connection between the power grid and the generator stator; and sequentially starting the grid-side power module and the machine-side power module of the second converter to put the wind turbine generator set into the electric operation mode.

[0013] In a possible implementation of the first aspect, after controlling the wind turbine generator set to enter the electric operation mode, the method further includes: obtaining a second blade vibration parameter; determining whether the blade exits the aerodynamic vibration state based on the second blade vibration parameter; and controlling the wind turbine generator set to exit the electric operation mode in response to the blade exiting the aerodynamic vibration state.

[0014] In a possible implementation of the first aspect, the second aerodynamic vibration parameter includes: a cabin acceleration and blade accelerations corresponding to multiple blades; determining whether the blade has exited the aerodynamic vibration state based on the second blade vibration parameter includes: determining whether the blade accelerations and cabin accelerations corresponding to all blades are both less than a corresponding second acceleration threshold; in response to the blade accelerations and cabin accelerations corresponding to all blades being less than the corresponding second acceleration threshold, determining that the blade has exited the aerodynamic vibration state.

[0015] In a possible implementation of the first aspect, the wind turbine generator set includes a semi-direct-drive wind turbine generator set, the semi-direct-drive wind turbine generator set includes a first converter, and the first converter is arranged between the power grid and the generator stator; controlling the wind turbine generator set to exit the electric operation mode includes: sequentially shutting down the machine-side power module and the grid-side power module of the first converter, so that the wind turbine generator set exits the electric operation mode.

[0016] In a possible implementation of the first aspect, the wind turbine generator set includes a doubly-fed wind turbine generator set, which includes a second converter, a grid-connected contactor, and a short-circuit contactor. The second converter is arranged between the power grid and the generator rotor, the moving contact group of the grid-connected contactor is connected to the power grid, and the static contact group of the grid-connected contactor is respectively connected to the generator stator and the moving contact group of the short-circuit contactor. Controlling the wind turbine generator set to exit the electric operation mode includes: sequentially shutting down the machine-side power module and the grid-side power module of the second converter, and disconnecting the short-circuit contactor, so that the wind turbine generator set exits the electric operation mode.

[0017] In a second aspect, an embodiment of the present invention provides a controller, comprising: a processor; a memory; wherein the memory stores a computer program, and when the computer program is executed by the processor, the method for suppressing blade vibration as described above is implemented.

[0018] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute any of the above methods for suppressing blade vibration.

[0019] In a fourth aspect, an embodiment of the present invention provides a semi-direct-drive wind turbine generator set, which includes: a first converter and the controller as described above, wherein the first converter is arranged between the power grid and the generator stator.

[0020] In a fifth aspect, an embodiment of the present invention provides a doubly fed wind turbine generator set, which includes: a second converter, a grid-connected contactor, a short-circuit contactor and the controller as described above; the second converter is arranged between the power grid and the generator rotor, the moving contact group of the grid-connected contactor is connected to the power grid, and the static contact group of the grid-connected contactor is respectively connected to the generator stator and the moving contact group of the short-circuit contactor.

[0021] As described above, in an embodiment of the present invention, when a yaw fault occurs in a wind turbine generator set, the first blade vibration parameter is first obtained; then, based on the first blade vibration parameter, it is determined whether the blade is in an aerodynamic vibration state; in response to the blade being in the aerodynamic vibration state, the wind turbine generator set is controlled to enter an electric operation mode, and the generator outputs electromagnetic torque to drive the impeller to rotate, so that the blade exits the aerodynamic vibration state.

[0022] That is to say, when the blades are in an aerodynamic vibration state, the embodiment of the present invention only needs to adjust the operating mode of the wind turbine generator set to effectively suppress blade vibration and avoid blade damage and breakage during its life. It has the advantages of simple operation and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention can be better understood from the following description of specific embodiments of the present invention in conjunction with the accompanying drawings, wherein the same or similar reference numerals represent the same or similar features.

[0024] Figure 1 A flow chart of a method for suppressing blade vibration provided by one embodiment of the present invention;

[0025] Figure 2 A flow chart of a method for suppressing blade vibration provided by another embodiment of the present invention;

[0026] Figure 3 It is the grid-connected topology of the semi-direct drive wind turbine in the power generation mode;

[0027] Figure 4 It is the grid-connected topology of the semi-direct drive wind turbine in the electric operation mode;

[0028] Figure 5 The grid-connected topology of the doubly-fed wind turbine generator set in the power generation mode;

[0029] Figure 6 The grid-connected topology of a doubly-fed wind turbine generator set in motoring mode;

[0030] Figure 7 This is a connection diagram of the short-circuit contactor corresponding to the doubly-fed wind turbine generator set;

[0031] Figure 8 A flow chart of a method for suppressing blade vibration provided in yet another embodiment of the present invention;

[0032] Figure 9 A schematic diagram showing a simulation comparison of the generator torque before and after the electric operation mode is turned on according to an embodiment of the present invention;

[0033] Figure 10 Schematic diagram of simulation comparison of impeller speed, blade root load and blade deformation before and after the electric operation mode is turned on, provided in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 30-first converter; 50-second converter; G1-generator; G11-generator stator;

[0036] G12-generator rotor; G2-gearbox; Y1-impeller; P1-grid-side power module;

[0037] P2-machine side power module; K1-grid contactor; K2-short-circuit contactor. DETAILED DESCRIPTION

[0038] The features and exemplary embodiments of various aspects of the present invention will be described in detail below.In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of the present invention.

[0039] An embodiment of the present invention provides a method for suppressing blade vibration, which can effectively suppress the vibration of the blades of a wind turbine generator set by utilizing the existing electrical configuration of the wind turbine generator set.

[0040] like Figure 1 As shown, the method for suppressing blade vibration provided by the embodiment of the present invention includes steps S101 to S103.

[0041] Step S101: obtaining a first blade vibration parameter under a working condition where a yaw fault occurs in a wind turbine generator set;

[0042] Step S102: determining whether the blade is in an aerodynamic vibration state according to the first blade vibration parameter;

[0043] The first blade vibration parameter may include the nacelle acceleration and blade accelerations corresponding to the plurality of blades. Acceleration sensors may be installed on the nacelle and each blade respectively to obtain corresponding acceleration data.

[0044] Among them, the blade is in an aerodynamic vibration state means that the blade is in the stall angle range over a large area due to a yaw failure. The negative aerodynamic damping generated causes the blade to have a higher vibration amplitude in the swing direction. This vibration amplitude can be measured by the acceleration data of the cabin and / or the blade.

[0045] For example, it is possible to first determine whether the blade acceleration or cabin acceleration corresponding to any blade is greater than its respective corresponding first acceleration threshold; if the blade acceleration corresponding to any blade is greater than the first acceleration threshold corresponding to the blade, or the cabin acceleration is greater than the first acceleration threshold corresponding to the cabin, it can be determined that the blade is in an aerodynamic vibration state.

[0046] Taking a wind turbine with three blades as an example, as long as the acceleration of one of the blades is greater than the corresponding acceleration threshold, or the nacelle acceleration is greater than the corresponding acceleration threshold, it means that the blade is in an aerodynamic vibration state. In order to avoid damage and breakage of the blade during its life, the blade vibration needs to be suppressed.

[0047] It should be noted that due to the different positions of the blades and nacelle, blade acceleration and nacelle acceleration can each correspond to different acceleration thresholds, which need to be set based on actual conditions. Specifically, the aforementioned "first acceleration threshold" is a threshold used to indicate that the blade has entered an aerodynamic vibration state, including both acceleration thresholds corresponding to blade acceleration and acceleration thresholds corresponding to nacelle acceleration.

[0048] Step S103: In response to the blades being in an aerodynamic vibration state, controlling the wind turbine generator set to enter an electric operation mode.

[0049] Among them, the electric operation mode refers to the mode in which the generator of the wind turbine generator receives power from the grid and outputs electromagnetic torque to the impeller shaft.

[0050] In the electric operation mode, the generator rotor can drive the impeller to rotate, breaking the aerodynamic state around the blades, interrupting the continuous energy exchange process between the blades and the air, reducing the excitation of the blades, thereby suppressing the blade vibration and causing the blades to exit the aerodynamic vibration state.

[0051] As described above, in an embodiment of the present invention, when a yaw failure occurs in a wind turbine generator set, the first blade vibration parameter is first obtained, and then whether the blade is in an aerodynamic vibration state is determined based on the first blade vibration parameter. If the blade is in the aerodynamic vibration state, the wind turbine generator set is controlled to enter an electric operation mode, and the generator outputs electromagnetic torque to drive the impeller to rotate, so that the blade exits the aerodynamic vibration state.

[0052] That is to say, when the blades are in an aerodynamic vibration state, the embodiment of the present invention only needs to adjust the operating mode of the wind turbine generator set to effectively suppress blade vibration and avoid blade damage and breakage during its life. It has the advantages of simple operation and strong applicability.

[0053] In some embodiments, as Figure 2 As shown, after controlling the wind turbine generator set to enter the electric operation mode, the method for suppressing blade vibration may further include steps S104 to S106.

[0054] Step S104: obtaining vibration parameters of the second blade;

[0055] Step S105: determining whether the blade has exited the aerodynamic vibration state according to the second blade vibration parameter;

[0056] Step S106: When the blades exit the aerodynamic vibration state, the wind turbine generator set is controlled to exit the electric operation mode.

[0057] The second blade vibration parameter may include a nacelle acceleration and blade accelerations corresponding to the plurality of blades. Exemplarily, the aerodynamic vibration state may first determine whether the blade accelerations and nacelle accelerations corresponding to all blades are less than their respective second acceleration thresholds. If the blade accelerations and nacelle accelerations corresponding to all blades are less than their respective second acceleration thresholds, it is ultimately determined that the blade has exited the aerodynamic vibration state.

[0058] It should be noted that the above-mentioned "second acceleration threshold" is a second-type threshold used to indicate that the blade exits the aerodynamic vibration state, including both the acceleration threshold corresponding to the blade acceleration and the acceleration threshold corresponding to the cabin acceleration.

[0059] In some embodiments, the first acceleration threshold corresponding to the blade acceleration may be made equal to the corresponding Δt, and the first acceleration threshold corresponding to the nacelle acceleration may be made equal to the corresponding second acceleration threshold.

[0060] In some embodiments, the first acceleration threshold corresponding to the blade acceleration can be made smaller than the second acceleration threshold corresponding thereto, and the first acceleration threshold corresponding to the nacelle acceleration can be made smaller than the second acceleration threshold corresponding thereto, so as to retain a certain control margin and reduce the switching frequency of controlling the wind turbine generator set to enter and exit the electric operation mode.

[0061] For example, the first acceleration threshold corresponding to the blade acceleration is 1mm / s, and the second acceleration threshold is 0.8mm / s. When the blade acceleration is greater than 1mm / s, it is determined that the blade is in an aerodynamic vibration state, and the wind turbine generator set is controlled to enter the electric operation mode. Then, as the impeller rotates, the blade acceleration gradually decreases. When the blade acceleration is lower than 0.8mm / s, it is determined that the blade has exited the aerodynamic vibration state, and the wind turbine generator set is controlled to exit the electric operation mode.

[0062] In this embodiment, when it is determined that the blade has exited the aerodynamic vibration state, the generator can be controlled to exit the electric operation mode to reduce the power consumption of the power grid. At the same time, the process returns to step S101 to monitor the vibration parameters of the first blade, timely detect and effectively suppress the blade vibration, and improve the safety of the wind turbine generator set.

[0063] The method for suppressing blade vibration in an embodiment of the present invention is described below by taking a semi-direct drive wind turbine generator set as an example.

[0064] Figure 3 and Figure 4 The grid-connected topologies of the semi-direct-drive wind turbine generator set in the power generation mode and the motoring mode are respectively shown. The semi-direct-drive wind turbine generator set includes a first converter 30 , which is arranged between the grid and the generator stator G11 .

[0065] See Figure 3In the power generation mode of the semi-direct-drive wind turbine generator set, the impeller Y1 rotates under the action of wind energy, and the impeller shaft is connected to the low-speed shaft of the gearbox G2. After the speed is regulated by the gearbox G2, the high-speed shaft of the gearbox G2 drives the generator rotor to rotate. The generator stator G11 induces electrical energy and integrates the electrical energy into the power grid through the machine-side power module P2 and the grid-side power module P1 of the first converter 30.

[0066] See Figure 4 In response to the blades being in the aerodynamic vibration state, the grid-side power module P1 and the generator-side power module P2 of the first converter 30 are sequentially activated to transmit grid power to the generator stator, causing the wind turbine to enter the motoring mode. In this mode, the generator G1 outputs electromagnetic torque to drive the impeller rotation, causing the blades to exit the aerodynamic vibration state. Similarly, when the blades exit the aerodynamic vibration state, the generator-side power module P2 and the grid-side power module P1 of the first converter 30 are sequentially shut down to exit the motoring mode.

[0067] As can be seen from the above, in this embodiment, for the semi-direct-drive wind turbine generator set, it is only necessary to perform corresponding startup operations on the grid-side power module P1 and the machine-side power module P2 of its first converter 30, so that the wind turbine generator set can enter the electric operation mode, and drive the impeller Y1 to rotate by outputting electromagnetic torque through the generator G1, so that the blades exit the aerodynamic vibration state. Since the first converter 30 belongs to the existing electrical configuration of the semi-direct-drive wind turbine generator set, the method for suppressing blade vibration in the embodiment of the present invention can achieve the purpose of effectively suppressing blade vibration by only using the existing electrical configuration of the wind turbine generator set, which has the advantages of simple operation and strong applicability.

[0068] The method for suppressing blade vibration in an embodiment of the present invention will be described below by taking a doubly-fed wind turbine generator set as an example. Figure 5 and Figure 6 The grid-connected topologies of the doubly-fed wind turbine generator set in the power generation mode and the motoring mode are shown respectively.

[0069] like Figure 5 and Figure 6 As shown, the generator stator G11 and the generator rotor G12 of the doubly fed wind turbine generator set can both exchange power with the power grid. The doubly fed wind turbine generator set includes a second converter 50, a grid-connected contactor K1, and a short-circuit contactor K2. The second converter 50 is provided between the power grid and the generator rotor G12 to achieve power exchange between the generator rotor G12 and the power grid; see Figure 7 The moving contact group of the grid-connected contactor K1 is connected to the grid, and the static contact group of the grid-connected contactor K1 is connected to the generator stator G11 and the moving contact group of the short-circuit contactor K2 respectively, to realize power exchange between the generator stator G11 and the grid.

[0070] See Figure 5 In the power generation operation mode, the grid-connected contactor K1 of the doubly-fed wind turbine generator set is in a closed state, the short-circuit contactor K2 is in an open state, the impeller Y1 rotates under the action of wind energy, and the impeller shaft is connected to the low-speed shaft of the gearbox G2. After the speed is regulated by the gearbox G2, the high-speed shaft of the gearbox G2 drives the generator rotor G12 to rotate. The generator stator G11 and the generator rotor G12 both sense electrical energy. The electrical energy induced by the generator G1 is directly incorporated into the power grid through the generator stator G11 in one way, and is incorporated into the power grid in the other way through the machine-side power module P2 and the grid-side power module P1 of the first converter 30.

[0071] See Figure 6 When the blades are in the aerodynamic vibration state, the electrical connection between the grid and the generator stator G11 is disconnected by first closing the short-circuit contactor K2. Then, the grid-side power module P1 and the generator-side power module P2 of the second converter 50 are sequentially activated. This allows grid power to be transmitted to the generator stator G11, causing the wind turbine to enter the electric operation mode. In this mode, the generator G1 outputs electromagnetic torque to drive the impeller Y1 to rotate, causing the blades to exit the aerodynamic vibration state. Similarly, when the blades exit the aerodynamic vibration state, the generator-side power module P2 and the grid-side power module P1 of the second converter 50 are sequentially closed, and the short-circuit contactor K2 is then disconnected, allowing the wind turbine to exit the electric operation mode.

[0072] As can be seen from the above, in this embodiment, for the doubly fed wind turbine generator set, it is only necessary to perform corresponding operations on its short-circuit contactor K2, the grid-side power module P1 and the machine-side power module P2 of the second converter 50, so that the generator can enter the electric operation mode, and drive the impeller to rotate by outputting electromagnetic torque through the generator, so that the blades exit the aerodynamic vibration state. Since the short-circuit contactor K2 and the second converter 50 belong to the existing electrical configuration of the doubly fed wind turbine generator set, the method for suppressing blade vibration in the embodiment of the present invention can achieve the purpose of effectively suppressing blade vibration by only using the existing electrical configuration of the wind turbine generator set, which has the advantages of simple operation and strong applicability.

[0073] To facilitate understanding by those skilled in the art, Figure 8 The method for suppressing blade vibration according to an embodiment of the present invention is described by way of example. Figure 8 The process includes steps S801 to S811.

[0074] Step S801: The unit is in power generation mode;

[0075] Step S802: Determine whether a yaw failure shutdown occurs; if so, execute step S803; otherwise, return to step S801;

[0076] Step S803: detecting blade acceleration and nacelle acceleration;

[0077] Step S804: determine whether the blade acceleration or the nacelle acceleration exceeds the corresponding acceleration threshold; if so, execute step S805; otherwise, return to step S803;

[0078] Step S805: start the electric operation mode;

[0079] Step S806: determine whether the current wind turbine generator set is a doubly-fed wind turbine generator set. If so, execute step S807; otherwise, execute step 808.

[0080] Step S807, close the short-circuit contactor K2, and go to step S808;

[0081] Step S808: Start the grid-side power module P1 of the converter;

[0082] Step S809: Start the power module P2 on the machine side of the converter to drive the impeller to rotate;

[0083] Step S810: Determine whether the blade acceleration or the nacelle acceleration is lower than the corresponding acceleration threshold. If so, execute step 811; otherwise, return to step S809;

[0084] Step S811: stop the generator-side power module P2 and the grid-side power module P1 in sequence, disconnect the short-circuit contactor K2, and then return to step S802.

[0085] The effect of the method for suppressing blade vibration according to an embodiment of the present invention will be described below by taking a large-impeller high-power offshore unit as an example.

[0086] Environmental conditions: wind speed 30m / s, steady wind, wind shear 0.11.

[0087] Unit status: The unit has a yaw failure and cannot face the wind normally. The wind deviation is constant at 30°. The impeller is in a free state and the blades are stopped in the retracted position.

[0088] Figure 9 A schematic diagram showing a simulation comparison of the generator torque before and after the electric operation mode is turned on;

[0089] Figure 10 A schematic diagram showing the simulation comparison of impeller speed, blade root load, and blade deformation before and after the electric operation mode is turned on.

[0090] from Figure 9 and Figure 10 It can be seen that before the electric operation mode is turned on, the generator torque is close to 0, the blade deformation gradually increases, the blade load gradually increases, and the impeller speed rotates slightly positive and negative; after the electric operation mode is turned on ( Figure 9 and Figure 10 The trigger time shown in the figure starts from 40s. In actual application, it can be triggered according to the data obtained by the sensors of blade acceleration and cabin acceleration). The generator torque is increased to about 191KNm (about 80% of the rated motor torque) through a gradual loading method, the impeller speed is increased to about 1.5rpm, the blade root load has no divergent trend, and the blade deformation has no divergent increasing trend, indicating that turning on the electric operation mode can effectively suppress the vibration of the blade.

[0091] An embodiment of the present invention further provides a controller, comprising: a processor; a memory; wherein the memory stores a computer program, and when the computer program is executed by the processor, the method for suppressing blade vibration as described in any one of the above items is implemented.

[0092] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute any of the above methods for suppressing blade vibration.

[0093] The embodiment of the present invention also provides a semi-direct drive wind turbine generator set, see Figure 3 and Figure 4 The semi-direct drive wind turbine generator set includes: a first converter 30 and the controller as described above, and the first converter 30 is arranged between the power grid and the generator stator G11.

[0094] The embodiment of the present invention also provides a double-fed wind turbine generator set, see Figure 5 and Figure 6 The doubly-fed wind turbine generator set includes: a second converter 50, a grid-connected contactor K1, a short-circuit contactor K2, and the controller described above; the second converter 50 is arranged between the power grid and the generator rotor G12, the moving contact group of the grid-connected contactor K1 is connected to the power grid, and the static contact group of the grid-connected contactor K1 is respectively connected to the generator stator G11 and the moving contact group of the short-circuit contactor K2.

[0095] It should be noted that the method for suppressing blade vibration in the embodiment of the present invention is applicable to impeller systems with different numbers of blades, and is also applicable to upwind and downwind units, and is only used for any technical solution that includes switching from a generator mode to an electric motor to drive the impeller rotation; application scenarios include yaw failures that make it impossible to yaw, and also include scenarios where yaw cannot be performed to the wind due to maintenance, etc.

[0096] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the device embodiment, the relevant parts can refer to the description part of the method embodiment. The embodiments of the present invention are not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions, or change the order of the steps after understanding the spirit of the embodiments of the present invention. In addition, for the sake of brevity, a detailed description of known method technologies is omitted here.

[0097] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of the embodiments of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link via a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0098] The embodiments of the present invention may be implemented in other specific forms without departing from the spirit and essential characteristics thereof. For example, the algorithms described in a particular embodiment may be modified without departing from the basic spirit of the embodiments of the present invention. Therefore, the present embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the embodiments of the present invention is defined by the appended claims rather than the foregoing description, and all modifications that come within the meaning and scope of equivalents of the claims are thereby included within the scope of the embodiments of the present invention.

Claims

1. A method for suppressing blade vibration, characterized in that: include: Under a working condition where a yaw fault occurs in a wind turbine generator set, obtaining first blade vibration parameters, the first blade vibration parameters including: nacelle acceleration and blade accelerations corresponding to the plurality of blades; determining, based on the first blade vibration parameter, whether the blade is in an aerodynamic vibration state; In response to the blades being in the aerodynamic vibration state, controlling the wind turbine generator set to enter an electric operation mode, wherein in the electric operation mode, the generator of the wind turbine generator set outputs electromagnetic torque to drive the impeller to rotate, so that the blades exit the aerodynamic vibration state. The electric operation mode refers to a mode in which the generator of the wind turbine generator set receives power from the grid and outputs electromagnetic torque to the impeller shaft; After controlling the wind turbine generator set to enter the electric operation mode, the method further includes: Acquire a second blade vibration parameter, where the second blade vibration parameter includes a nacelle acceleration and blade accelerations corresponding to the plurality of blades; determining whether blade accelerations and nacelle accelerations corresponding to all blades are less than corresponding second acceleration thresholds; In response to blade accelerations and nacelle accelerations corresponding to all blades being less than corresponding second acceleration thresholds, determining that the blades have exited an aerodynamic vibration state; In response to the blade exiting the aerodynamic vibration state, the wind turbine generator set is controlled to exit the electric operation mode.

2. The method according to claim 1, characterized in that The determining, based on the first blade vibration parameter, whether the blade is in an aerodynamic vibration state includes: Determining whether a blade acceleration or a nacelle acceleration corresponding to any blade is greater than a corresponding first acceleration threshold; In response to a blade acceleration or a nacelle acceleration corresponding to any blade being greater than a corresponding first acceleration threshold, it is determined that the blade is in an aerodynamic vibration state.

3. The method according to claim 1, characterized in that The wind turbine generator set comprises a semi-direct-drive wind turbine generator set, the semi-direct-drive wind turbine generator set comprises a first converter (30), and the first converter (30) is arranged between the power grid and the generator stator (G11); The controlling the wind turbine generator set to enter the electric operation mode includes: The grid-side power module (P1) and the generator-side power module (P2) of the first converter (30) are started in sequence, so that the wind turbine generator set enters an electric operation mode.

4. The method according to claim 1, wherein The wind turbine generator set comprises a doubly-fed wind turbine generator set, the doubly-fed wind turbine generator set comprising a second converter (50), a grid-connected contactor (K1) and a short-circuit contactor (K2), the second converter (50) being arranged between the grid and the generator rotor (G12), the moving contact group of the grid-connected contactor (K1) being connected to the grid, the static contact group of the grid-connected contactor (K1) being connected to the generator stator (G11) and the moving contact group of the short-circuit contactor (K2), respectively; The controlling the wind turbine generator set to enter the electric operation mode includes: Closing the short-circuit contactor (K2) to disconnect the electrical connection between the grid and the generator stator (G11); The grid-side power module (P1) and the generator-side power module (P2) of the second converter (50) are started in sequence, so that the wind turbine generator set enters an electric operation mode.

5. The method according to claim 1, characterized in that The wind turbine generator set comprises a semi-direct-drive wind turbine generator set, the semi-direct-drive wind turbine generator set comprises a first converter (30), and the first converter (30) is arranged between the power grid and the generator stator (G11); The controlling the wind turbine generator set to exit the electric operation mode includes: The machine-side power module (P2) and the grid-side power module (P1) of the first converter (30) are sequentially turned off, so that the wind turbine generator set exits the electric operation mode.

6. The method according to claim 1, characterized in that The wind turbine generator set comprises a doubly-fed wind turbine generator set, the doubly-fed wind turbine generator set comprising a second converter (50), a grid-connected contactor (K1) and a short-circuit contactor (K2), the second converter (50) being arranged between the grid and the generator rotor (G12), the moving contact group of the grid-connected contactor (K1) being connected to the grid, the static contact group of the grid-connected contactor (K1) being connected to the generator stator (G11) and the moving contact group of the short-circuit contactor (K2), respectively; The controlling the wind turbine generator set to exit the electric operation mode includes: The machine-side power module (P2) and the grid-side power module (P1) of the second converter (50) are sequentially turned off, and the short-circuit contactor (K2) is disconnected, so that the wind turbine generator set exits the electric operation mode.

7. A controller, characterized in that: include: processor; Memory; wherein the memory stores a computer program, and when the computer program is executed by the processor, the method for suppressing blade vibration according to any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method for suppressing blade vibration according to any one of claims 1 to 6.

9. A semi-direct drive wind turbine generator set, characterized in that: include: A first converter (30) and a controller as claimed in claim 7, wherein the first converter (30) is arranged between the power grid and the generator stator (G11).

10. A doubly-fed wind turbine generator set, characterized in that: include: A second converter (50), a grid contactor (K1), a short-circuit contactor (K2) and a controller as claimed in claim 7; The second converter (50) is arranged between the power grid and the generator rotor (G12), the moving contact group of the grid-connected contactor (K1) is connected to the power grid, and the static contact group of the grid-connected contactor (K1) is respectively connected to the generator stator (G11) and the moving contact group of the short-circuit contactor (K2).

Images