Method for suppressing blade vibration, controller and wind turbine generator

Abstract

NOT VISIBLE DUE TO STATUS OF PATENT

Description

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

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202311822619.6, filed on December 27, 2023, entitled “Method, Controller and Wind Turbine Generator for Suppressing Blade Vibration,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of wind power generation, and in particular to a method for suppressing blade vibration, a controller, and a wind turbine generator set. Background Art

[0004] 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.

[0005] 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.

[0006] 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.

[0007] Application Contents

[0008] The embodiments of the present application 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.

[0009] In a first aspect, an embodiment of the present application provides a method for suppressing blade vibration, the method comprising:

[0010] Under the working condition of a yaw fault of the wind turbine generator set, obtaining a vibration parameter of a first blade;

[0011] determining, based on the first blade vibration parameter, whether the blade is in an aerodynamic vibration state;

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In a second aspect, an embodiment of the present application provides a controller, which includes: 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.

[0021] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable a computer to execute any of the above-mentioned methods for suppressing blade vibration.

[0022] In a fourth aspect, an embodiment of the present application 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.

[0023] In a fifth aspect, an embodiment of the present application 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.

[0024] As described above, in the embodiment of the present application, when a yaw failure 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.

[0025] That is to say, when the blades are in an aerodynamic vibration state, the embodiment of the present application only needs to adjust the operating mode of the wind turbine generator set to effectively suppress blade vibration and avoid damage and breakage during the blade life. It has the advantages of simple operation and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application can be better understood from the following description of specific embodiments of the present application in conjunction with the accompanying drawings, wherein the same or similar figure numbers represent the same or similar features.

[0027] FIG1 is a flow chart of a method for suppressing blade vibration provided by one embodiment of the present application;

[0028] FIG2 is a flow chart of a method for suppressing blade vibration provided by another embodiment of the present application;

[0029] Figure 3 shows the grid-connected topology of a semi-direct drive wind turbine generator set in power generation mode;

[0030] Figure 4 shows the grid-connected topology of a semi-direct drive wind turbine in electric operation mode;

[0031] FIG5 is a grid-connected topology of a doubly-fed wind turbine generator set in power generation mode;

[0032] Figure 6 shows the grid-connected topology of a doubly-fed wind turbine generator set in motoring mode;

[0033] FIG7 is a schematic diagram of the connection of the short-circuit contactor corresponding to the doubly-fed wind turbine generator set;

[0034] FIG8 is a flow chart of a method for suppressing blade vibration provided by another embodiment of the present application;

[0035] FIG9 is 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 application;

[0036] FIG10 is a schematic diagram showing a simulation comparison of the impeller speed, blade root load, and blade deformation before and after the electric operation mode is turned on, according to an embodiment of the present application.

[0037] Explanation of reference numerals: 30 - first converter; 50 - second converter; G1 - generator; G11 - generator stator; G12 - generator rotor; G2 - gearbox; Y1 - impeller; P1 - grid-side power module; P2 - generator-side power module; K1 - grid contactor; K2 - short-circuit contactor. DETAILED DESCRIPTION

[0038] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are set forth in order to provide a comprehensive understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessary ambiguity in the present application; and, for clarity, the sizes of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0039] In order to better understand the present application, the method for suppressing blade vibration, the controller and the wind turbine generator set provided by the embodiments of the present application are described in detail below with reference to Figures 1 to 10.

[0040] The embodiments of the present application provide a method for suppressing blade vibration, which can effectively suppress the vibration of the blades of the wind turbine generator set by utilizing the existing electrical configuration of the wind turbine generator set.

[0041] As shown in FIG1 , the method for suppressing blade vibration provided in an embodiment of the present application includes steps S101 to S103 .

[0042] Step S101: obtaining a first blade vibration parameter under a working condition where a yaw fault occurs in a wind turbine generator set;

[0043] Step S102: determining whether the blade is in an aerodynamic vibration state according to the first blade vibration parameter;

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] As described above, in the embodiment of the present application, when a yaw failure occurs in the wind turbine generator set, the first blade vibration parameter is first obtained, and then based on the first blade vibration parameter, it is determined whether the blade is in an aerodynamic vibration state. If the blade is in the aerodynamic vibration state, the wind turbine generator set is controlled to enter the electric operation mode, and the generator outputs electromagnetic torque to drive the impeller to rotate, so that the blade exits the aerodynamic vibration state.

[0053] That is to say, when the blades are in an aerodynamic vibration state, the embodiment of the present application only needs to adjust the operating mode of the wind turbine generator set to effectively suppress blade vibration and avoid damage and breakage during the blade life. It has the advantages of simple operation and strong applicability.

[0054] In some embodiments, as shown in FIG2 , 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 .

[0055] Step S104: obtaining vibration parameters of the second blade;

[0056] Step S105: determining whether the blade has exited the aerodynamic vibration state according to the second blade vibration parameter;

[0057] Step S106: When the blades exit the aerodynamic vibration state, the wind turbine generator set is controlled to exit the electric operation mode.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The method for suppressing blade vibration in the embodiment of the present application is described below using a semi-direct drive wind turbine generator set as an example.

[0065] 3 and 4 respectively show the grid-connected topology of the semi-direct-drive wind turbine generator set in the power generation mode and the motoring mode. The semi-direct-drive wind turbine generator set includes a first converter 30 , which is arranged between the grid and the generator stator G11 .

[0066] Referring to Figure 3, when the semi-direct-drive wind turbine generator set is in the power generation operation mode, 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, and 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.

[0067] Referring to 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 motoring mode. In this mode, the generator G1 outputs electromagnetic torque to drive the impeller, 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 deactivated, causing the wind turbine to exit motoring mode.

[0068] From the above, it can be seen that for the semi-direct-drive wind turbine generator set in this embodiment, 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 based on the embodiment of the present application 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.

[0069] The following describes the method for suppressing blade vibration in the embodiment of the present application by taking a doubly-fed wind turbine generator set as an example. Figures 5 and 6 respectively show the grid-connected topology of the doubly-fed wind turbine generator set in the power generation mode and the motoring mode.

[0070] As shown in Figures 5 and 6, both the generator stator G11 and the generator rotor G12 of a doubly-fed wind turbine generator set can 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 positioned between the power grid and the generator rotor G12, enabling power exchange between the generator rotor G12 and the power grid. Referring to Figure 7, the moving contact group of the grid-connected contactor K1 is connected to the power grid, while the stationary contact group of the grid-connected contactor K1 is connected to the moving contact groups of the generator stator G11 and the short-circuit contactor K2, respectively, enabling power exchange between the generator stator G11 and the power grid.

[0071] 5 , in the power generation mode of the doubly-fed wind turbine generator set, the grid-connected contactor K1 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 grid through the generator stator G11 in one path, and is incorporated into the grid in the other path through the machine-side power module P2 and the grid-side power module P1 of the first converter 30.

[0072] Referring to Figure 6 , when the blades are in the aerodynamic vibration state, the electrical connection between the grid and 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.

[0073] 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 of the second converter 50, and the machine-side power module P2, so that the generator can enter the electric operation mode, and drive the impeller to rotate through the electromagnetic torque output by 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, therefore, based on the method of suppressing blade vibration in the embodiment of the present application, only the existing electrical configuration of the wind turbine generator set is used to achieve the purpose of effectively suppressing blade vibration, which has the advantages of simple operation and strong applicability.

[0074] To facilitate understanding by those skilled in the art, FIG8 illustrates an example of the method for suppressing blade vibration according to an embodiment of the present application. The process in FIG8 includes steps S801 to S811.

[0075] Step S801: The unit is in power generation mode;

[0076] Step S802: Determine whether a yaw failure shutdown occurs; if so, execute step S803; otherwise, return to step S801;

[0077] Step S803: detecting blade acceleration and nacelle acceleration;

[0078] 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;

[0079] Step S805: start the electric operation mode;

[0080] 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.

[0081] Step S807, close the short-circuit contactor K2, and go to step S808;

[0082] Step S808: Start the grid-side power module P1 of the converter;

[0083] Step S809: Start the power module P2 on the machine side of the converter to drive the impeller to rotate;

[0084] 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;

[0085] 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.

[0086] The following uses a large-impeller, high-power offshore unit as an example to illustrate the effect of the method for suppressing blade vibration in an embodiment of the present application.

[0087] Environmental conditions: wind speed 30m / s, steady wind, wind shear 0.11.

[0088] 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.

[0089] FIG9 shows a schematic diagram of a simulation comparison of the generator torque before and after the electric operation mode is turned on;

[0090] FIG10 shows a schematic diagram of the simulation comparison of the impeller speed, blade root load, and blade deformation before and after the electric operation mode is turned on.

[0091] As can be seen from Figures 9 and 10, 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 (the trigger time shown in Figures 9 and 10 starts from 40s, and the actual application can be triggered according to the data obtained by the sensors of blade acceleration and cabin acceleration), the generator torque increases to about 191KNm (about 80% of the rated motor torque) through a gradual loading method, the impeller speed increases 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.

[0092] An embodiment of the present application 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.

[0093] An embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable a computer to execute any of the above methods for suppressing blade vibration.

[0094] The embodiment of the present application further provides a semi-direct drive wind turbine generator set. Referring to FIG. 3 and FIG. 4 , the semi-direct drive wind turbine generator set includes: a first converter 30 and the controller as described above. The first converter 30 is arranged between the power grid and the generator stator G11.

[0095] An embodiment of the present application also provides a doubly-fed wind turbine generator set, referring to Figures 5 and 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 as 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.

[0096] It should be noted that the method for suppressing blade vibration in the embodiment of the present application 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 generator mode to electric motor to drive the impeller rotation; application scenarios include yaw failure and inability to yaw, as well as scenarios where yaw to the wind cannot be performed due to maintenance.

[0097] It should be understood 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 application 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 between the steps after understanding the spirit of the embodiments of the present application. In addition, for the sake of brevity, a detailed description of known method technologies is omitted here.

[0098] 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, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in unit, a function card, etc. When implemented in software, the elements of the embodiments of the present application 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 a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium that can store or transmit 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.

[0099] Those skilled in the art should understand that the above embodiments are exemplary rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specifications and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other devices or steps; when an item is not modified by a quantifier, it is intended to include one / kind or more / kinds of items and can be used interchangeably with "one / kind or more / kinds of items"; the terms "first" and "second" are used to identify names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The functions of multiple parts appearing in the claims can be implemented by a separate hardware or software module. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A method for suppressing blade vibration, wherein, Including: Under the condition that a yaw fault occurs in a wind turbine generator set, obtaining first blade vibration parameters; Determining whether the blade is in an aerodynamic vibration state according to the first blade vibration parameters; In response to the blade being in an 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 blade exits the aerodynamic vibration state.

2. The method according to claim 1, wherein, The first blade vibration parameters include: nacelle acceleration and blade accelerations corresponding to multiple blades; the determining whether the blade is in an aerodynamic vibration state according to the first blade vibration parameters includes: Determining whether the blade acceleration corresponding to any one blade or the nacelle acceleration is greater than a corresponding first acceleration threshold; In response to the blade acceleration corresponding to any one blade or the nacelle acceleration being greater than the corresponding first acceleration threshold, determining that the blade is in an aerodynamic vibration state.

3. The method according to claim 1, wherein 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; The controlling the wind turbine generator set to enter an electric operation mode includes: Starting the grid-side power module and the machine-side power module of the first converter 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 includes a doubly-fed wind turbine generator set, the doubly-fed wind turbine generator set 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; The controlling the wind turbine generator set to enter an electric operation mode includes: Closing the short-circuit contactor to disconnect the electrical connection between the power grid and the generator stator; Starting the grid-side power module and the machine-side power module of the second converter in sequence, so that the wind turbine generator set enters an electric operation mode.

5. The method according to claim 1, wherein, After the controlling the wind turbine generator set to enter an electric operation mode, the method further includes: Obtaining second blade vibration parameters; Determining whether the blade exits the aerodynamic vibration state according to the second blade vibration parameters; In response to the blade exiting the aerodynamic vibration state, controlling the wind turbine generator set to exit the electric operation mode.

6. The method according to claim 5, wherein, The second aerodynamic vibration parameters include: nacelle acceleration and blade accelerations corresponding to multiple blades; the determining whether the blade exits the aerodynamic vibration state according to the second blade vibration parameters includes: Determining whether the blade accelerations corresponding to all blades and the nacelle acceleration are all less than corresponding second acceleration thresholds; In response to the blade accelerations corresponding to all blades and the nacelle acceleration being all less than the corresponding second acceleration thresholds, determining that the blade exits the aerodynamic vibration state.

7. The method according to claim 5, wherein, 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; The controlling the wind turbine generator set to exit the electric operation mode includes: Sequentially turn off 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.

8. The method according to claim 5, wherein, The wind turbine generator set includes a doubly-fed wind turbine generator set, the doubly-fed wind turbine generator set 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 turn off the machine-side power module and the grid-side power module of the second converter, and disconnect the short-circuit contactor, so that the wind turbine generator set exits the electric operation mode.

9. A controller, wherein, including: 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 according to any one of claims 1-8 is implemented.

10. A computer-readable storage medium, wherein, The computer-readable storage medium stores computer instructions for causing a computer to execute the method for suppressing blade vibration according to any one of claims 1-8.

11. A semi-direct drive wind turbine generator, wherein, including: a first converter and the controller according to claim 9, the first converter being arranged between the power grid and the generator stator.

12. A doubly-fed wind turbine generator, wherein, including: a second converter, a grid-connected contactor, a short-circuit contactor, and the controller according to claim 9; 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.