Limit load control method, device, medium and wind turbine generator set

Abstract

The present disclosure provides a limit load control method, device, medium and wind turbine generator set. The limit load control method can comprise: obtaining a load value of a gearbox; determining a numerical relationship between the load value of the gearbox and a predetermined limit load threshold; performing a power limiting operation on the wind turbine generator set according to the range where the numerical relationship is located, so as to reduce the load value of the gearbox. The limit load control method according to the embodiments of the present disclosure can appropriately reduce the load margin of the gearbox, reduce the cost of the wind turbine generator set, and improve the safety of the wind turbine generator set.

Description

Technical Field

[0001] This disclosure generally relates to the field of wind power, and more specifically, to a method, apparatus, medium, and wind turbine generator set for ultimate load control. Background Technology

[0002] The gearbox is one of the most important components of large semi-direct drive wind turbine generators and doubly fed wind turbine generators, and it also accounts for a large proportion of the overall cost.

[0003] On the one hand, if the load margin of the gearbox is designed to be too large, it will greatly increase the cost of the wind turbine generator set; on the other hand, if the load margin of the gearbox is designed to be insufficient, it may cause damage to the gearbox, which will seriously affect the safety of the wind turbine generator set and result in extremely high maintenance and hoisting costs.

[0004] Traditional gearbox load protection methods involve adding resistance to the transmission chain. However, this method primarily reduces transmission chain fatigue and protects the support bearings, but it does not directly protect the gearbox. It can only indirectly reduce the gearbox's ultimate load and lacks sufficient reliability. Summary of the Invention

[0005] One of the objectives of the exemplary embodiments disclosed herein is to provide an ultimate load control method capable of reducing the load value of a gearbox.

[0006] One of the objectives of the exemplary embodiments disclosed herein is to provide an ultimate load control method that can appropriately reduce the gearbox load margin and improve the safety of wind turbine generator sets.

[0007] According to one aspect of this disclosure, a method for controlling the ultimate load of a wind turbine generator gearbox is provided. The ultimate load control method includes: obtaining a load value of the gearbox; determining a numerical relationship between the load value of the gearbox and a predetermined ultimate load threshold; and performing a power limiting operation on the wind turbine generator according to the range of the numerical relationship to reduce the load value of the gearbox.

[0008] According to another aspect of this disclosure, a computer-readable storage medium is provided that stores instructions or programs that, when executed by a processor, implement the ultimate load control method for a wind turbine gearbox as described above.

[0009] According to another aspect of this disclosure, a limit load control device for a wind turbine generator gearbox is provided. The limit load control device includes: a load value acquisition unit for acquiring the load value of the gearbox; a load comparison unit for determining the numerical relationship between the load value of the gearbox and a predetermined limit load threshold; and a control unit for performing power limiting operation on the wind turbine generator according to the range of the numerical relationship, so as to reduce the load value of the gearbox.

[0010] According to another aspect of this disclosure, an ultimate load control device for a wind turbine gearbox is provided. The ultimate load control device includes a processor and a memory: the memory is used to store program code and transmit the program code to the processor; the processor is used to execute the ultimate load control method for the wind turbine gearbox as described above according to the instructions in the program code.

[0011] According to another aspect of this disclosure, a wind turbine generator set is provided, which includes the ultimate load control device as described above or the computer-readable storage medium as described above.

[0012] The ultimate load control method and ultimate load control device according to embodiments of this disclosure may not require additional sensors.

[0013] The ultimate load control method and ultimate load control device according to embodiments of this disclosure can reduce the cost of wind turbine generator sets.

[0014] Further aspects and / or advantages of the general concept of the invention will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of the general concept of the invention. Attached Figure Description

[0015] The above and other objects and features of exemplary embodiments of this disclosure will become clearer from the following description taken in conjunction with the accompanying drawings, which exemplarily illustrate the embodiments, wherein:

[0016] Figure 1 This is a flowchart illustrating an ultimate load control method according to a first embodiment of the present disclosure;

[0017] Figure 2 This is a flowchart illustrating a limit load control method according to a second embodiment of the present disclosure;

[0018] Figure 3 This is a flowchart illustrating a limit load control method according to a third embodiment of the present disclosure;

[0019] Figure 4 This is a flowchart illustrating the ultimate load control method according to the fourth embodiment of the present disclosure;

[0020] Figure 5 This is a flowchart illustrating a limit load control method according to a fifth embodiment of the present disclosure;

[0021] Figure 6 This is a block diagram illustrating an ultimate load control device according to an embodiment of the present disclosure. Detailed Implementation

[0022] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, examples of which are illustrated in the drawings, wherein the same reference numerals always refer to the same parts. The embodiments will now be described with reference to the accompanying drawings in order to explain this disclosure.

[0023] The ultimate load control method and ultimate load control device according to embodiments of the present disclosure are used to reduce the load value (e.g., ultimate load value) of the gearbox of a wind turbine generator set.

[0024] This disclosure obtains the gearbox load value by means of sensor measurement or by means of estimation using known parameters, and performs one of a variety of power limiting operations based on the magnitude of the gearbox load value and the time it remains within a certain range, thereby reducing the gearbox load value.

[0025] The ultimate load control method and ultimate load control device according to embodiments of the present disclosure utilize different ultimate load thresholds to perform power limiting control actions, thereby achieving the purpose of ultimate load protection for the gearbox.

[0026] The ultimate load control method and ultimate load control device according to embodiments of the present disclosure perform power limiting operation when the estimated or measured gearbox load value exceeds a pre-designed threshold load value or ultimate load value, thereby providing overload protection for the gearbox of the wind turbine generator set.

[0027] When the gearbox is operating normally between the cut-in and cut-out wind speeds, the normal working load it experiences generally does not exceed a predetermined threshold load. However, loads caused by external disturbances and extreme loads under conditions such as extreme winds, emergency shutdowns, and typhoons may cause the load value to exceed the predetermined limit threshold load. The limit load control method and limit load control device according to embodiments of this disclosure can be used to control the load and provide overload protection for the gearbox when it exceeds the threshold load under the above conditions.

[0028] Exemplary embodiments of this disclosure will now be described in conjunction with the accompanying drawings.

[0029] Figure 1 This is a flowchart illustrating a limit load control method according to a first embodiment of the present disclosure. Figure 2 This is a flowchart illustrating a limit load control method according to a second embodiment of the present disclosure. Figure 3 This is a flowchart illustrating a limit load control method according to a third embodiment of the present disclosure. Figure 4 This is a flowchart illustrating the ultimate load control method according to the fourth embodiment of the present disclosure. Figure 5 This is a flowchart illustrating a limit load control method according to a fifth embodiment of the present disclosure.

[0030] like Figure 1As shown, according to an embodiment of this disclosure, the ultimate load control method for the gearbox of a wind turbine generator set includes steps S110, S120 and S130.

[0031] In step S110, the load value of the gearbox of the wind turbine generator set is obtained.

[0032] Specifically, the load value of the gearbox (e.g., the load on the low-speed shaft Mx of the drive train) can be obtained based on a sensor used to measure the load value of the gearbox, or the corresponding load value can be extracted based on pre-measured load data, or the corresponding load value can be obtained by estimating the load on the low-speed shaft Mx of the drive train of the wind turbine gearbox.

[0033] In one example, step S110 of obtaining the load value of the gearbox of a wind turbine generator set may include: estimating the load value of the gearbox based on the operating parameters of the wind turbine generator set during operation and the basic information of the wind turbine generator set.

[0034] As an example, the basic information of a wind turbine generator set may include the rotor inertia, the gearbox reduction ratio, and the gearbox and generator inertia. The operating parameters of the wind turbine generator set during operation may include the generator speed and the generator electromagnetic torque.

[0035] The load value of the gearbox can be estimated based on the impeller inertia, gearbox reduction ratio, generator electromagnetic torque, and generator speed change rate of the wind turbine generator set, and on the gearbox transmission chain dynamic equation.

[0036] As an example, the above-mentioned transmission chain dynamics equation can be shown as Equation (1) below.

[0037]

[0038] Among them, T low For the load on the gearbox (e.g., the input torque of the gearbox), J hub G is the hub inertia or rotor inertia of the wind turbine generator set, G is the reduction ratio of the transmission chain or gearbox, and J is the reduction ratio of the gearbox. g For the inertia of the gearbox and generator, T is the rate of change of the generator's speed. g This refers to the electromagnetic torque of the generator.

[0039] The generator speed change rate can be obtained by subtracting the generator speed. As an example, the generator speed difference result can be filtered by a moving average with a small time constant (e.g., less than 0.5) to remove high-frequency noise.

[0040] The moving average filter is a first-order infinite impulse response filter. The formula for calculating the moving average filter is as follows:

[0041]

[0042] Where X refers to the input of the filter (i.e., the generator speed change rate including high-frequency noise), Y refers to the output of the filter (i.e., the generator speed change rate), and α is the filtering time constant. As an example, α can be less than 0.5.

[0043] The load value of the gearbox can be obtained through the above equation (1), and it can be found through equation (1) that the most effective way to reduce the load value of the gearbox is to reduce the electromagnetic torque of the generator, that is, to reduce the power.

[0044] As an example, power reduction operation may include at least one of reducing the generator torque and reducing the generator speed, and may be specifically achieved by performing corresponding controls on the converter or pitch system.

[0045] In step S120, the numerical relationship between the load value of the gearbox and the predetermined ultimate load threshold is determined.

[0046] Here, the predetermined ultimate load threshold can be the ultimate load value of the pre-designed gearbox.

[0047] The numerical relationship between the load value of the gearbox and the predetermined ultimate load threshold may include the difference between the load value of the gearbox and the predetermined ultimate load threshold, or the ratio between the load value of the gearbox and the predetermined ultimate load threshold. However, the parameters that can reflect the numerical relationship between the load value of the gearbox and the predetermined ultimate load threshold are not limited to these.

[0048] In step S130, a power limiting operation is performed on the wind turbine generator set according to the range of the numerical relationship, so as to reduce the load value of the gearbox.

[0049] For example, a power limiting operation can be performed when the difference between the load value of the gearbox and a predetermined ultimate load threshold exceeds a preset range or a predetermined threshold, or when the ratio between the load value of the gearbox and a predetermined ultimate load threshold exceeds a preset range or a predetermined threshold.

[0050] To prevent frequent start-stop operations during power limiting, appropriate duration judgment conditions can be set.

[0051] As an example, different levels of power limiting operations can be performed when the difference between the gearbox load value and a predetermined ultimate load threshold exceeds a preset range or a predetermined threshold, or when the ratio between the gearbox load value and the predetermined ultimate load threshold exceeds a preset range or a predetermined threshold, and the time exceeding the preset range or the predetermined threshold lasts for a predetermined time.

[0052] Reference Figure 2 According to embodiments of this disclosure, the ultimate load control method for wind turbine gearboxes may include steps S210, S220, and S230.

[0053] As an example, in step S210, the load value of the gearbox is estimated based on the operating parameters of the wind turbine generator set and the basic information of the wind turbine generator set. The operating parameters of the wind turbine generator set and the basic information of the wind turbine generator set can be as described above, and will not be repeated here.

[0054] Similar to step S120, in step S220, the numerical relationship between the gearbox load value and a predetermined ultimate load threshold is determined. The predetermined ultimate load threshold can be a threshold determined during the wind turbine design phase, or it can be adaptively adjusted during operation.

[0055] In step S230, one of a variety of power limiting operations with different power limiting degrees is performed based on the range of the numerical relationship and the duration of the numerical relationship remaining in that range.

[0056] In one example, a power limiting operation may be performed when the difference between the gearbox load value and a predetermined ultimate load threshold is greater than a predetermined value, or when the ratio between the gearbox load value and the predetermined ultimate load threshold is greater than a predetermined value, and the time during which the difference or ratio is greater than the predetermined value continues for a predetermined time.

[0057] The larger the difference or ratio mentioned above, the greater the degree of power limiting operation can be performed; the longer the difference or ratio is greater than the predetermined value for a period of time, the greater the degree of power limiting operation can be performed.

[0058] Reference Figure 3 and Figure 4 The specific execution process of step S130 or S230 will be described.

[0059] In step S2310, the ratio R between the load value of the gearbox and the predetermined limit load threshold can be obtained.

[0060] In steps S2320 and S2230, the range of the ratio R and the duration of the ratio R within that range are determined.

[0061] In step S2340, in response to the ratio R between the load value of the gearbox and the predetermined ultimate load threshold being greater than or equal to the first threshold T1 and remaining for a first predetermined time, a first power limiting operation is performed to limit the power of the wind turbine generator to the first power.

[0062] In one example, a first power limiting operation, which limits the power of a wind turbine to a first power, can be performed by controlling the torque and speed of the generator through the converter and / or pitch system.

[0063] Alternatively, in response to a ratio R between the gearbox load value and a predetermined ultimate load threshold being greater than or equal to a second threshold T2 and maintained for a second predetermined time, a first power limiting operation is performed to limit the power of the wind turbine generator to a first power, wherein the first threshold is less than the second threshold and the second predetermined time is less than the first predetermined time.

[0064] In other words, a first power limiting operation can also be performed when the ratio R between the gearbox load value and the predetermined ultimate load threshold is greater than the threshold value but the duration is shorter. This first power limiting operation is one of the aforementioned power limiting operations.

[0065] In one example, power limiting can be performed by reducing generator torque or generator speed.

[0066] Reference Figure 4 and Figure 5 It can utilize different load thresholds of different gearboxes to perform various power-limiting operations with varying degrees.

[0067] In step S2350, the range of the ratio R and the duration of the ratio R within that range can be determined.

[0068] In step S2360, in response to the ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a third threshold T3 and held for a third predetermined time, a second power limiting operation of limiting the power of the wind turbine generator to a second power can be performed, wherein the third threshold is greater than the second threshold, the third predetermined time is less than the second predetermined time, and the second power is less than the first power.

[0069] Specifically, the second power limiting operation can be performed by simultaneously reducing both the generator torque and the generator speed. In other words, the second power limiting operation can be performed by simultaneously controlling both the converter and the pitch system. This second power limiting operation is one of the various power limiting operations mentioned above.

[0070] As an example, the first threshold T1, the second threshold T2, and the third threshold T3 can be 1, 1.1, and 1.2, respectively, and the first predetermined time, the second predetermined time, and the third predetermined time can be 30 minutes, 10 minutes, and 1 minute, respectively. The first threshold T1, the second threshold T2, the third threshold T3, the first predetermined time, the second predetermined time, and the third predetermined time can all be predetermined and can be adjusted as needed.

[0071] This disclosure sets three threshold loads for corresponding judgments, but this disclosure is not limited to these, and more different threshold loads can be set for corresponding judgments as needed.

[0072] Power limiting operation may not be performed if the ratio between the load value of the gearbox and the predetermined ultimate load threshold is not within the above range or does not meet the duration requirement.

[0073] When the load value of the gearbox is reduced to the target load value, the wind turbine can be restored to normal power generation (i.e., the power limiting operation is exited).

[0074] Reference Figure 5 In steps S2370 and S2380, the range of the ratio R between the load value of the gearbox and the predetermined ultimate load threshold, as well as the time during which the ratio R remains or persists within that range, can be determined.

[0075] In step S2390, in response to the execution of the first power limiting operation, if the ratio between the load value of the gearbox and the predetermined ultimate load threshold is less than the first threshold T1, and the time during which the ratio is less than the first threshold lasts for a fourth predetermined time, the wind turbine can be restored to normal power generation or exit the power limiting operation.

[0076] In response to the execution of the second power limiting operation, if the ratio is less than the fourth threshold and the time when the ratio is less than the fourth threshold lasts for a fifth predetermined time, the wind turbine can also be restored to normal power generation. The fourth threshold can be less than the first threshold, the fifth predetermined time can be less than the fourth predetermined time, the fourth threshold can be 0.9 or 0.8, the fourth predetermined time can be 30 minutes, and the fifth predetermined time can be 10 minutes.

[0077] Each of the above steps can be programmed as a software program or instruction. Therefore, the gearbox ultimate load control method according to the exemplary embodiments of the present disclosure can be implemented via software. The computer-readable storage medium of the exemplary embodiments of the present disclosure can store a computer program that, when executed by a processor, implements the gearbox ultimate load control method as described in the exemplary embodiments above.

[0078] Computer-readable storage media include non-transitory computer-readable storage media, such as magnetic media like floppy disks and magnetic tapes, optical media (including optical disc (CD) ROMs and DVD ROMs), magneto-optical media like flexible optical discs, hardware devices such as ROMs, RAMs, and flash memory designed for storing and executing program instructions. The program instructions include language code executable by a computer using an interpreter and machine language code generated by a compiler.

[0079] In one example, the instructions or software comprise machine code (such as machine code generated by a compiler) that is directly executed by one or more processors or computers. In another example, the instructions or software comprise higher-level code that is executed by one or more processors or computers using an interpreter. The instructions or software can be written using any programming language based on the block diagrams and flowcharts shown in the accompanying drawings and the corresponding descriptions in the specification.

[0080] The ultimate load control device according to embodiments of the present disclosure will now be described.

[0081] Figure 6 This is a block diagram illustrating an ultimate load control device according to an embodiment of the present disclosure.

[0082] Reference Figure 6 The ultimate load control device for the gearbox of a wind turbine generator set according to embodiments of the present disclosure may include a load value acquisition unit 610, a load comparison unit 620, and a control unit 630.

[0083] The load value acquisition unit 610 can obtain the load value of the gearbox.

[0084] The load value acquisition unit 610 can obtain the load value of the gearbox (e.g., the load of the low-speed shaft Mx of the drive train) based on a sensor used to measure the load value of the gearbox, or extract the corresponding load value based on pre-measured load data, or obtain the corresponding load value by estimating the load of the low-speed shaft Mx of the drive train of the wind turbine gearbox.

[0085] In one example, the load value acquisition unit 610 can estimate the gearbox load value based on the operating parameters of the wind turbine generator set during operation and the basic information of the wind turbine generator set.

[0086] As an example, basic information about a wind turbine generator set may include the rotor inertia, gearbox reduction ratio, and gearbox and generator inertia. Operating parameters during wind turbine generator set operation may include generator speed and generator electromagnetic torque.

[0087] The load value acquisition unit 610 can estimate the load value of the gearbox based on the rotor inertia of the wind turbine generator set, the reduction ratio of the gearbox, the electromagnetic torque of the generator of the wind turbine generator set, the rate of change of the generator speed of the wind turbine generator set, and the transmission chain dynamic equation of the gearbox. The load value acquisition unit 610 can obtain the load value of the gearbox of the wind turbine generator set according to the above transmission chain dynamic equation.

[0088] The load comparison unit 620 can determine the numerical relationship between the load value of the gearbox and a predetermined ultimate load threshold.

[0089] The numerical relationship between the load value of the gearbox and the predetermined ultimate load threshold can be any mathematical operation other than the difference and ratio mentioned above, which can reflect the numerical relationship between the load value of the gearbox and the predetermined ultimate load threshold.

[0090] The control unit 630 can perform power limiting operations on the wind turbine generator set according to the range of the numerical relationship, so as to reduce the load value of the gearbox.

[0091] The control unit 630 can perform one of several power-limiting operations with varying degrees of power limiting, depending on the range of the numerical relationship and the duration for which the numerical relationship remains within that range. Power-limiting operations may include torque reduction and speed reduction operations, and the control unit 630 can perform power reduction operations by controlling the converter and / or pitch system.

[0092] In one example, a power limiting operation may be performed when the difference between the gearbox load value and a predetermined ultimate load threshold is greater than a predetermined value, or when the ratio between the gearbox load value and the predetermined ultimate load threshold is greater than a predetermined value, and the time during which the difference or ratio is greater than the predetermined value continues for a predetermined time.

[0093] The larger the difference or ratio mentioned above, the greater the degree of power limiting operation can be performed. The longer the difference or ratio exceeds the predetermined value for the predetermined time, the greater the degree of power limiting operation can be performed.

[0094] The power limiting operation performed when the difference or ratio is relatively large but the duration is long can be the same as the power limiting operation performed when the difference or ratio is relatively small but the duration is short.

[0095] Exiting power limiting operation or transitioning from power limiting operation to normal generator status does not require the complete completion of the corresponding power limiting operation. For example, during the execution of a second power limiting operation, the gearbox load value can be assessed in real time. Therefore, the second power limiting operation state can be exited before it is completely completed. After exiting the second power limiting operation state, the generator can enter normal generation status or the first power limiting operation state.

[0096] As an example, the control unit 630 may perform a first power limiting operation to limit the power of the wind turbine generator to a first power in response to a ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a first threshold and held for a first predetermined time.

[0097] The control unit 630 can perform a first power limiting operation to limit the power of the wind turbine generator to a first power in response to a ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a second threshold and maintained for a second predetermined time. The first threshold may be less than the second threshold and the second predetermined time may be less than the first predetermined time.

[0098] As an example, the first threshold can be 1.0, the second threshold can be 1.1, the first scheduled time can be 30 minutes, and the second scheduled time can be 10 minutes.

[0099] The control unit 630 may perform a second power limiting operation (e.g., 0.8 times rated power) to limit the power of the wind turbine generator to a second power in response to a ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a third threshold T3 and held for a third predetermined time. The third threshold may be 1.2, the third threshold may be greater than the second threshold, the third predetermined time may be less than the second predetermined time, and the second power may be less than the first power.

[0100] The control unit 630 can perform a second power limiting operation by simultaneously reducing the generator torque and generator speed. In other words, the control unit 630 can simultaneously control the converter and the pitch system to perform the power limiting operation.

[0101] In one example, control unit 630 may, in response to the execution of a first power limit (e.g., 0.9 times rated power), where the ratio is less than a first threshold and the time the ratio remains less than the first threshold is a fourth predetermined time, restore the wind turbine to normal power generation or deactivate it. The fourth predetermined time may be 30 minutes or 10 minutes.

[0102] In one example, control unit 630 may restore the wind turbine to normal power generation in response to performing a second power limiting operation (e.g., 0.8 times rated power) that is less than a fourth threshold for a period of time that is less than the fourth threshold for a fifth predetermined time. The fifth predetermined time may be 10 minutes.

[0103] In one example, the control unit 630 may restore the wind turbine to normal power generation in response to performing a first power limiting operation (e.g., 0.9 times rated power) that is less than a fifth threshold and that is less than the fifth threshold for a sixth predetermined time.

[0104] The fifth predetermined time can be 10 minutes. The fifth threshold can be less than the fourth threshold, and the fifth threshold can be 0.8, and the sixth threshold can be 0.9; however, this disclosure is not limited thereto.

[0105] According to various embodiments of this disclosure, apparatus (e.g., modules or their functions) or methods can be implemented by programs or instructions stored in a computer-readable storage medium. When such instructions are executed by a processor, the processor can perform a function corresponding to the instruction or a method corresponding to the instruction (e.g., a gearbox limit load control method). At least a portion of a module can be implemented (e.g., executed) by a processor. At least a portion of a programmed module can include modules, programs, routines, instruction sets, and procedures for performing at least one function.

[0106] For example, the ultimate load control device for a wind turbine gearbox according to an embodiment of the present disclosure may include a processor and a memory, the memory being used to store program code and transmit the program code to the processor; the processor being used to execute the ultimate load control method for the wind turbine gearbox as described above according to the instructions in the program code.

[0107] The gearbox ultimate load control method according to embodiments of the present disclosure can be implemented by software, hardware, or a combination thereof. The hardware device can be implemented by one or more software modules for performing the operations of the various embodiments of the present disclosure.

[0108] The modules or programming modules disclosed herein may include at least one of the aforementioned components, with some components omitted or others added. The operations of the modules, programming modules, or other components may be executed sequentially, in parallel, cyclically, or probingly. Furthermore, some operations may be executed in a different order, may be omitted, or may be extended with other operations.

[0109] The computer-readable storage medium and / or ultimate load control device of the exemplary embodiments of this disclosure may be part of a wind turbine generator set, or part of a pitch controller or pitch control system, or part of a wind power converter. The aforementioned ultimate load control device may be located in the main controller of the wind turbine generator set.

[0110] An exemplary embodiment of the present disclosure may provide a gearbox ultimate load controller, which may include a processor (not shown) and a memory (not shown), wherein the memory stores a computer program that, when executed by the processor, implements the ultimate load control method for a wind turbine gearbox as described in the exemplary embodiment above.

[0111] Wind turbine generator sets according to embodiments of the present disclosure may include the ultimate load control device as described above or the computer-readable storage medium as described above.

[0112] The gearbox ultimate load control method and ultimate load control device for wind turbine generator sets according to embodiments of the present disclosure can reduce the ultimate load of the gearbox and improve the operational reliability of the wind turbine generator set.

[0113] The gearbox ultimate load control method and ultimate load control device for wind turbine generator sets according to embodiments of the present disclosure can reduce the cost of wind turbine generator sets.

[0114] While some exemplary embodiments of this disclosure have been described, those skilled in the art will understand that modifications may be made to these embodiments without departing from the principles and spirit of this disclosure, which are defined by the claims and their equivalents. For example, technical features of different embodiments may be combined.

Claims

1. A method for controlling the ultimate load of a wind turbine generator gearbox, characterized in that, include: Obtain the load value of the gearbox; Determine the numerical relationship between the load value of the gearbox and a predetermined ultimate load threshold; Based on the range of the stated numerical relationship, the wind turbine generator set is subjected to power limiting operation to reduce the load value of the gearbox. The steps for performing power limiting operations on the wind turbine generator set based on the range of the numerical relationship include: Based on the range of the numerical relationship and the duration for which the numerical relationship remains within that range, one of several power limiting operations with varying degrees of power limiting is performed on the wind turbine generator set. The step of performing one of several power limiting operations with different degrees on the wind turbine generator set based on the range of the numerical relationship and the duration for which the numerical relationship remains within that range includes: In response to a ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a first threshold and remaining so for a first predetermined time, a first power limiting operation is performed to limit the power of the wind turbine generator to a first power; and In response to the ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a second threshold and remaining at that threshold for a second predetermined time, a first power limiting operation is performed to limit the power of the wind turbine generator to the first power, wherein the first threshold is less than the second threshold and the second predetermined time is less than the first predetermined time. The multiple power limiting operations include a first power limiting operation.

2. The ultimate load control method for the gearbox of a wind turbine generator set according to claim 1, characterized in that, The step of performing one of several power limiting operations with different degrees on the wind turbine generator set based on the range of the numerical relationship and the duration for which the numerical relationship remains within that range further includes: In response to the ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a third threshold and remaining at that threshold for a third predetermined time, a second power limiting operation is performed to limit the power of the wind turbine generator to a second power, wherein the third threshold is greater than the second threshold, the third predetermined time is less than the second predetermined time, and the second power is less than the first power; The various power limiting operations include a first power limiting operation and a second power limiting operation.

3. The ultimate load control method for the gearbox of a wind turbine generator set according to claim 2, characterized in that, The step of performing one of several power limiting operations with different degrees on the wind turbine generator set based on the range of the numerical relationship and the duration for which the numerical relationship remains within that range further includes: In response to the execution of the first power limiting operation, if the ratio is less than the first threshold and the time during which the ratio is less than the first threshold continues for a fourth predetermined time, the wind turbine generator will be restored to normal power generation status, or... In response to the execution of the second power limiting operation, if the ratio is less than a fourth threshold and the time during which the ratio is less than the fourth threshold continues for a fifth predetermined time, the wind turbine generator will be restored to normal power generation. Wherein, the fourth threshold is less than the first threshold, and the fifth predetermined time is less than the fourth predetermined time.

4. The ultimate load control method for the gearbox of a wind turbine generator set according to any one of claims 1 to 3, characterized in that, The steps to obtain the load value of the gearbox include: The load value of the gearbox is estimated based on the operating parameters of the wind turbine generator set during operation and the basic information of the wind turbine generator set.

5. The ultimate load control method for the gearbox of a wind turbine generator set according to claim 4, characterized in that, The basic information includes the rotor inertia of the wind turbine generator set, the reduction ratio of the gearbox, and the gearbox and generator inertia of the wind turbine generator set. The operating parameters include the generator speed of the wind turbine generator set and the generator electromagnetic torque of the wind turbine generator set. The step of estimating the load value of the gearbox based on the operating parameters of the wind turbine generator set and the basic information of the wind turbine generator set includes: Based on the impeller inertia, the reduction ratio, the electromagnetic torque, and the rate of change of the generator speed of the wind turbine generator set, the load value of the gearbox is estimated according to the transmission chain dynamic equation of the gearbox.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions or programs that, when executed by a processor, implement the ultimate load control method for the wind turbine gearbox according to any one of claims 1 to 5.

7. A limit load control device for a wind turbine generator gearbox, characterized in that, include: The load value acquisition unit obtains the load value of the gearbox; The load comparison unit determines the numerical relationship between the load value of the gearbox and a predetermined limit load threshold. The control unit performs power limiting operations on the wind turbine generator set based on the range of the stated numerical relationship, in order to reduce the load value of the gearbox. The control unit performs one of several power limiting operations with varying degrees of power limiting on the wind turbine generator set based on the range of the numerical relationship and the duration for which the numerical relationship remains within that range. The control unit is configured to: in response to a ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a first threshold and maintained for a first predetermined time, perform a first power limiting operation to limit the power of the wind turbine generator to a first power; and In response to the ratio between the load value of the gearbox and a predetermined ultimate load threshold being greater than or equal to a second threshold and remaining at that threshold for a second predetermined time, a first power limiting operation is performed to limit the power of the wind turbine generator to the first power, wherein the first threshold is less than the second threshold and the second predetermined time is less than the first predetermined time. The multiple power limiting operations include a first power limiting operation.

8. The ultimate load control device for the wind turbine generator gearbox according to claim 7, characterized in that, The ultimate load control device is installed in the main controller of the wind turbine generator set.

9. A limit load control device for a wind turbine generator gearbox, characterized in that, Including the processor and memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the ultimate load control method for the wind turbine gearbox according to any one of claims 1-5, based on the instructions in the program code.

10. The ultimate load control device for the gearbox of a wind turbine generator set according to claim 9, characterized in that, The ultimate load control device is installed in the main controller of the wind turbine generator set.

11. A wind turbine generator set, characterized in that, Includes the ultimate load control device according to any one of claims 7 to 10 or the computer-readable storage medium according to claim 6.

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