Ice-coated wind turbine generator set speed and torque control method and related device

Abstract

The present application relates to wind power control technical field, specifically for a kind of icing condition under wind turbine unit speed torque control method and related equipment, by the matching relationship of nacelle anemograph wind speed and wind turbine generator output power, current temperature and nacelle temperature limit value of nacelle determine whether unit is in icing operation, when unit vibration exceeds threshold value, further protect unit by reducing generator speed or generator torque to replace shutdown, to avoid power loss caused by shutdown in the case of ensuring the safe operation of unit, on the other hand, avoid the fatigue damage caused by the continuous substantial vibration of unit due to blade icing operation, without through installation icing sensor or deicing system and other hardware, only to wind turbine control software is upgraded can be implemented, the cost of modification is small, can be operated under icing in the premise of ensuring the safe operation of unit to some extent.

Description

Technical Field

[0001] This invention relates to the field of wind power control technology, specifically to a method and related equipment for controlling the speed and torque of a wind turbine generator under icing conditions. Background Technology

[0002] With wind power plants increasingly installed in diverse terrains and environmental conditions, the various losses caused by blade icing in wind turbine generators have become a pressing issue for power generation operators. Blade icing causes unbalanced rotor rotation, generating harmful vibrations and loads. Falling ice can pose serious dangers to people and property in surrounding areas. Blade icing also reduces the aerodynamic performance of the blades, thus affecting the generator's output. Therefore, blade icing in wind turbine generators severely impacts the operational safety and power generation efficiency of wind farms.

[0003] Traditional wind turbine generators rely on icing sensors for monitoring and de-icing. However, this process requires retrofitting the generators with sensors and performing de-icing, which takes a considerable amount of time, results in some power generation loss, and is costly. Furthermore, there is no effective solution to ensure safe operation of generators under icing conditions for generators that cannot be retrofitted. Summary of the Invention

[0004] The purpose of this invention is to provide a method and related equipment for controlling the speed and torque of wind turbine generators under icing conditions, in order to overcome the problems of existing technologies that rely on installing icing sensors to monitor icing and perform de-icing operations on wind turbine generators. On the one hand, this requires retrofitting the generator set with sensors and performing de-icing, which takes a relatively long time, results in some power generation loss, and is also costly.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] Methods for controlling the speed and torque of wind turbine generators under icing conditions include:

[0007] Obtain the wind speed from the nacelle anemometer, the output power of the wind turbine generator, the current temperature of the nacelle, and the nacelle temperature limit. Based on the matching relationship between the wind speed from the nacelle anemometer and the output power of the wind turbine generator, as well as the current temperature of the nacelle and the nacelle temperature limit, determine whether the unit is operating under icing conditions. If yes, proceed to the next step; otherwise, terminate.

[0008] Obtain the front and rear nacelle accelerations and front and rear nacelle acceleration limits after the sliding average. Determine whether the unit is operating under icing conditions based on the front and rear nacelle accelerations and front and rear nacelle acceleration limits after the sliding average. If not, terminate the operation; otherwise, control the generator set speed.

[0009] Obtain the lateral nacelle acceleration and lateral nacelle acceleration limit after the sliding average. Determine whether the unit is operating under icing conditions based on the lateral nacelle acceleration and lateral nacelle acceleration limit after the sliding average. If not, terminate the operation. If so, control the generator torque.

[0010] Preferably, the method for determining whether the unit is operating under icing conditions, based on the matching relationship between the wind speed measured by the nacelle anemometer and the output power of the wind turbine generator, the current nacelle temperature, and the nacelle temperature limit, is as follows:

[0011] Determine if the wind speed of the nacelle anemometer matches the output power of the wind turbine generator according to the relationship table. If not, terminate. If yes, determine if the current nacelle temperature is less than the nacelle temperature limit and assess the turbine. If not, terminate. If yes, proceed to the next step.

[0012] Preferably, the method for obtaining the fore and aft cabin acceleration after moving average is as follows:

[0013] Get the current fore-and-aft acceleration of the cabin;

[0014] Take the absolute value of the fore-and-aft acceleration of the cabin;

[0015] The absolute value of the cabin's forward and backward acceleration is taken and then averaged over a standard time to obtain the averaged cabin forward and backward acceleration.

[0016] Preferably, the criteria for determining whether the unit is operating under icing conditions, based on the forward and aft nacelle accelerations after moving averages and the forward and aft nacelle acceleration limits, are as follows:

[0017] When the acceleration of the front and rear engine compartments after the sliding average is greater than the acceleration limit of the front and rear engine compartments, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator speed is controlled; if it is not greater, the process is terminated.

[0018] Preferably, the specific method for controlling the generator set speed is as follows:

[0019] If the current generator speed setpoint is obtained, the generator speed setpoint is lowered to the target speed setpoint value with a set slope.

[0020] Preferably, the method for obtaining the lateral nacelle acceleration after moving average is as follows:

[0021] Obtain the current lateral acceleration of the cabin;

[0022] Take the absolute value of the lateral acceleration of the cabin;

[0023] The absolute value of the cabin lateral acceleration is taken and then moved to a moving average over a standard time to obtain the moving average cabin lateral acceleration.

[0024] Preferably, the criteria for determining whether the unit is operating under icing conditions, based on the lateral nacelle acceleration after sliding average and the lateral nacelle acceleration limit, are as follows:

[0025] When the lateral nacelle acceleration after sliding average is greater than the lateral nacelle acceleration limit, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator torque is controlled; if it is not greater, the process terminates.

[0026] A wind turbine generator speed and torque control system under icing conditions includes:

[0027] Icing detection module: Used to obtain the wind speed of the nacelle anemometer, the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit. Based on the matching relationship between the wind speed of the nacelle anemometer and the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit, it determines whether the unit is operating under icing conditions. If yes, proceed to the next step; otherwise, terminate.

[0028] Speed ​​control module: used to obtain the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average. Based on the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average, it determines whether the unit is operating under ice conditions. If not, it terminates; if so, it controls the generator set speed.

[0029] Torque control module: used to obtain the lateral nacelle acceleration and lateral nacelle acceleration limit after sliding average, and to determine whether the unit is operating under icing conditions based on the lateral nacelle acceleration and lateral nacelle acceleration limit after sliding average. If not, it terminates; if so, it controls the torque of the generator set.

[0030] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement steps such as a method for controlling the speed and torque of a wind turbine generator under icing conditions.

[0031] A computer-readable storage medium storing a computer program that, when executed by a processor, implements steps such as those of a method for controlling the speed and torque of a wind turbine generator under icing conditions.

[0032] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for controlling the speed and torque of a wind turbine generator under icing conditions. The matching relationship between the wind speed of the nacelle anemometer and the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit are used to determine whether the unit is operating under icing conditions. When the vibration of the unit exceeds the threshold, the generator speed or generator torque is reduced to further protect the unit instead of shutting down. This avoids power outage losses caused by shutdown while ensuring the safe operation of the unit. On the other hand, it avoids fatigue damage caused by continuous large-scale vibration of the unit due to blade icing. Attached Figure Description

[0033] Figure 1 This is a flowchart of the wind turbine generator speed and torque control method under icing conditions according to the present invention;

[0034] Figure 2 This is a schematic diagram of the wind turbine generator speed and torque control system under icing conditions according to the present invention;

[0035] Figure 3 This is a flowchart of the wind turbine generator speed and torque control method under icing conditions according to an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0042] The present invention will now be described in further detail with reference to the accompanying drawings:

[0043] like Figure 1 As shown, the present invention provides a method for controlling the speed and torque of a wind turbine generator under icing conditions, comprising:

[0044] S101 acquires the wind speed from the nacelle anemometer, the output power of the wind turbine generator, the current nacelle temperature, and the nacelle temperature limit. Based on the matching relationship between the wind speed from the nacelle anemometer and the output power of the wind turbine generator, as well as the current nacelle temperature and the nacelle temperature limit, it determines whether the unit is operating under icing conditions. If yes, proceed to the next step; otherwise, terminate.

[0045] S102 obtains the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average. Based on the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average, it determines whether the unit is operating under icing conditions. If not, it terminates; if so, it controls the generator set speed.

[0046] S103 obtains the lateral nacelle acceleration and lateral nacelle acceleration limit after the sliding average, and determines whether the unit is operating under icing conditions based on the lateral nacelle acceleration and lateral nacelle acceleration limit after the sliding average. If not, the process terminates; if so, the generator torque is controlled.

[0047] The method for determining whether a wind turbine is operating under icing conditions is based on the matching relationship between the wind speed measured by the nacelle anemometer and the output power of the wind turbine generator, the current nacelle temperature, and the nacelle temperature limit.

[0048] Determine if the wind speed of the nacelle anemometer matches the output power of the wind turbine generator according to the relationship table. If not, terminate. If yes, determine if the current nacelle temperature is less than the nacelle temperature limit and assess the turbine. If not, terminate. If yes, proceed to the next step.

[0049] The method for obtaining the fore and aft cabin acceleration after moving average is as follows:

[0050] Get the current fore-and-aft acceleration of the cabin;

[0051] Take the absolute value of the fore-and-aft acceleration of the cabin;

[0052] The absolute value of the cabin's forward and backward acceleration is taken and then averaged over a standard time to obtain the averaged cabin forward and backward acceleration.

[0053] The criteria for determining whether a generator set is operating under icing conditions are based on the moving average of the front and rear nacelle accelerations and the front and rear nacelle acceleration limits.

[0054] When the acceleration of the front and rear engine compartments after the sliding average is greater than the acceleration limit of the front and rear engine compartments, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator speed is controlled; if it is not greater, the process is terminated.

[0055] The specific method for controlling the generator set speed is as follows:

[0056] If the current generator speed setpoint is obtained, the generator speed setpoint is lowered to the target speed setpoint value with a set slope.

[0057] The method for obtaining the lateral nacelle acceleration after moving average is as follows:

[0058] Obtain the current lateral acceleration of the cabin;

[0059] Take the absolute value of the lateral acceleration of the cabin;

[0060] The absolute value of the cabin lateral acceleration is taken and then moved to a moving average over a standard time to obtain the moving average cabin lateral acceleration.

[0061] The criteria for determining whether a generator unit is operating under icing conditions are based on the lateral nacelle acceleration after moving average and the lateral nacelle acceleration limit.

[0062] When the lateral nacelle acceleration after sliding average is greater than the lateral nacelle acceleration limit, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator torque is controlled; if it is not greater, the process terminates.

[0063] like Figure 2 As shown, the present invention also provides a wind turbine generator speed and torque control system under icing conditions, comprising:

[0064] Icing detection module: Used to obtain the wind speed of the nacelle anemometer, the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit. Based on the matching relationship between the wind speed of the nacelle anemometer and the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit, it determines whether the unit is operating under icing conditions. If yes, proceed to the next step; otherwise, terminate.

[0065] Speed ​​control module: used to obtain the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average. Based on the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average, it determines whether the unit is operating under ice conditions. If not, it terminates; if so, it controls the generator set speed.

[0066] Torque control module: used to obtain the lateral nacelle acceleration and lateral nacelle acceleration limit after sliding average, and to determine whether the unit is operating under icing conditions based on the lateral nacelle acceleration and lateral nacelle acceleration limit after sliding average. If not, it terminates; if so, it controls the torque of the generator set.

[0067] Real-time example:

[0068] like Figure 3 As shown, this invention provides a method for controlling the speed and torque of a wind turbine generator under icing conditions. The specific steps are as follows:

[0069] Step 1: Obtain the current cabin temperature T_nacelle;

[0070] Step 2: Obtain the cabin temperature limit threshold_nacelle;

[0071] Step 3: Obtain the wind speed Vwind from the naval anemometer;

[0072] Step 4: Obtain the output power of the wind turbine generator;

[0073] Step 5: Obtain the relationship table between Vwind and Power;

[0074] Step 6: Determine whether Vwind and Power match according to the relationship table. If the generator output power Power is only half of the normal operating power and T_nacelle is less than threshold_nacelle within the same range, it is determined that the unit is operating under icing conditions.

[0075] Step 7: If not, the judgment logic terminates; if yes, proceed to the next step.

[0076] Step 8: Obtain the current fore-and-aft acceleration acc_fa of the cabin;

[0077] Step 9: Take the absolute value of the fore-and-aft acceleration acc_fa, which is fab_acc_fa.

[0078] Step 10: Perform a moving average of fab_acc_fa with mov1 to obtain the forward and backward acceleration of the cabin after the moving average.

[0079] Step 11: Obtain the current pitch angle;

[0080] Step 12: Perform a moving average of pitch using mov2 to obtain the moving averaged mov_pitch;

[0081] Step 13: Obtain the relationship table between mov_pitch and mov_fab_acc_fa;

[0082] Step 14: Based on the relationship between mov_pitch and mov_fab_acc_fa obtained in Step 6, interpolate to calculate the acceleration limit threshold_acc_fa for the front and rear cabins;

[0083] Step 15: When the cabin acceleration mov_fab_acc_fa after the moving average is greater than the front and rear cabin acceleration limit threshold_acc_fa, the cumulative timer_fa starts counting.

[0084] Step 16: Obtain the cumulative time limit value duration_acc_fa;

[0085] Step 17: Determine if the cumulative time timer_fa is greater than duration_acc_fa;

[0086] Step 18: If not, the judgment logic terminates;

[0087] Step 19: Obtain the current generator speed setpoint speed_sp as follows;

[0088] Step 20: Using ratelimit_speed_sp as the slope, decrease speed_sp to speed_sp_target;

[0089] Step 21: Obtain the current cabin lateral acceleration acc_ss;

[0090] Step 22: Take the absolute value of acc_ss as fab_acc_ss;

[0091] Step 23: Perform a moving average of fab_acc_ss using mov1;

[0092] Step 24: Obtain the cabin lateral acceleration mov_fab_acc_ss after moving average;

[0093] Step 25: Obtain the relationship table between mov_pitch and mov_fab_acc_ss;

[0094] Step 26: Based on the relationship between mov_pitch and mov_fab_acc_ss obtained in Step 6, interpolate to calculate the lateral cabin acceleration limit value threshold_acc_ss;

[0095] Step 27: When the nacelle acceleration mov_fab_acc_ss after the sliding average is greater than the lateral nacelle acceleration limit threshold_acc_ss, the cumulative timer_ss starts counting.

[0096] Step 28: Obtain the cumulative time limit value duration_acc_ss;

[0097] Step 29: Determine if the cumulative time timer_ss is greater than duration_acc_ss;

[0098] Step 30: If not, the judgment logic terminates;

[0099] Step 31: Obtain the current generator torque setpoint torque_sp;

[0100] Step 32: Using ratelimit_torque_sp as the slope, reduce torch_sp to torch_sp_target;

[0101] Step 33: Send the latest speed_sp_target and torque_sp_target to the controller as the latest control targets to control the generator speed and torque.

[0102] Among the parameters mentioned above, mov1, mov2, duration_acc_fa, duration_acc_ss, ratelimit_speed_sp, ratelimit_torque_sp, speed_sp_target, torque_sp_target, and threshold_nacelle are jointly determined by the results of computer simulation of the wind turbine, actual field test results of the prototype, or actual operating data of the batch-operated units. The table below shows the range of generally selectable values:

[0103] parameter Selectable range mov1 0.1 to 1 second mov2 0.1 to 1 second duration_acc_fa 3-8 seconds duration_acc_ss 3-8 seconds ratelimit_speed_sp 0.1 to 0.3 revolutions per minute / second ratelimit_torque_sp 50~300Nm / s speed_sp_target speed_sp*80%~speed_sp*90% torque_sp_target torque_sp*70%~torque_sp*90% threshold_nacelle 0~3 degrees

[0104] mov_pitch(degree) mov_fab_acc_fa(g) 0 0.08 5 0.1 10 0.12 15 0.14 20 0.16 25 0.18

[0105]

[0106]

[0107] Cabin anemometer wind speed Vwind Normal power Icing power 3 meters per second 200 kilowatts 100 kW ± 30% 5 meters per second 600 kilowatts 300 kW ± 30% 7 meters per second 800 kilowatts 400 kW ± 30% 9 meters per second 1000 kilowatts 500 kW ± 30% 11 meters per second 1500 kilowatts 750 kW ± 30%

[0108] 1. This invention can analyze the relationship between current wind speed and power, and simultaneously identify whether the unit vibration has exceeded the limit. In the case of blade icing, it can reduce the power generation loss caused by shutdown by reducing the generator speed and generator torque instead of the traditional shutdown protection.

[0109] 2. This invention can analyze the relationship between current wind speed and power, and simultaneously identify whether the unit vibration has exceeded the limit. In the case of blade icing, it can replace the traditional shutdown protection by reducing the generator speed and generator torque, thereby operating at a lower generator speed and generator torque, and protecting the large components of the unit from fatigue damage caused by vibration.

[0110] 3. This invention does not require the installation of hardware such as icing sensors or de-icing systems; it can be implemented simply by upgrading the wind turbine control software, resulting in minimal modification costs.

[0111] 4. This invention can enable icing operation to a certain extent while ensuring the safe operation of the unit.

[0112] An embodiment of the present invention provides a terminal device. This terminal device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the various method embodiments described above. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the various device embodiments described above.

[0113] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0114] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0115] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0116] The memory can be used to store the computer program and / or module. The processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0117] If the modules / units integrated into the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0118] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art, guided by the specification, can make many other modifications without departing from the scope of the claims of the present invention, and all of these modifications are within the scope of protection of the present invention.

Claims

1. A method for controlling the speed and torque of a wind turbine generator under icing conditions, characterized in that, include: Obtain the wind speed from the nacelle anemometer, the output power of the wind turbine generator, the current temperature of the nacelle, and the nacelle temperature limit. Based on the matching relationship between the wind speed from the nacelle anemometer and the output power of the wind turbine generator, as well as the current temperature of the nacelle and the nacelle temperature limit, determine whether the unit is operating under icing conditions. If yes, proceed to the next step; otherwise, terminate. Obtain the front and rear nacelle accelerations and front and rear nacelle acceleration limits after the sliding average. Determine whether the unit is operating under icing conditions based on the front and rear nacelle accelerations and front and rear nacelle acceleration limits after the sliding average. If not, terminate the operation; otherwise, control the generator set speed. Obtain the lateral nacelle acceleration and lateral nacelle acceleration limit after the sliding average. Determine whether the unit is operating under icing conditions based on the lateral nacelle acceleration and lateral nacelle acceleration limit after the sliding average. If not, terminate the operation. If so, control the generator torque. The specific method for determining whether a wind turbine is operating under icing conditions is based on the matching relationship between the wind speed measured by the nacelle anemometer and the output power of the wind turbine generator, the current nacelle temperature, and the nacelle temperature limit. Determine whether the wind speed of the nacelle anemometer matches the output power of the wind turbine generator according to the relationship table. If not, terminate. If yes, determine whether the current temperature of the nacelle is less than the nacelle temperature limit and determine the turbine unit. If not, terminate. If yes, proceed to the next step. The method for obtaining the fore and aft cabin acceleration after moving average is as follows: Get the current fore-and-aft acceleration of the cabin; Take the absolute value of the fore-and-aft acceleration of the cabin; The absolute values ​​of the cabin's fore-and-aft accelerations are then averaged over a standard time interval to obtain the averaged cabin fore-and-aft accelerations. The criteria for determining whether a generator set is operating under icing conditions are based on the moving average of the front and rear nacelle accelerations and the front and rear nacelle acceleration limits. When the acceleration of the front and rear engine compartments after the sliding average is greater than the acceleration limit of the front and rear engine compartments, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator speed is controlled; if it is not greater, the process is terminated.

2. The method for controlling the speed and torque of a wind turbine generator under icing conditions according to claim 1, characterized in that, The specific method for controlling the generator set speed is as follows: Obtain the current generator speed setpoint and decrease the generator speed setpoint to the target speed setpoint value with a set slope.

3. The method for controlling the speed and torque of a wind turbine generator under icing conditions according to claim 1, characterized in that, The method for obtaining the lateral nacelle acceleration after moving average is as follows: Obtain the current lateral acceleration of the cabin; Take the absolute value of the lateral acceleration of the cabin; The absolute value of the cabin lateral acceleration is taken and then moved to a moving average over a standard time to obtain the moving average cabin lateral acceleration.

4. The method for controlling the speed and torque of a wind turbine generator under icing conditions according to claim 1, characterized in that, The criteria for determining whether a generator unit is operating under icing conditions are based on the lateral nacelle acceleration after moving average and the lateral nacelle acceleration limit. When the lateral nacelle acceleration after sliding average is greater than the lateral nacelle acceleration limit, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator torque is controlled; if it is not greater, the process terminates.

5. A wind turbine generator speed and torque control system under icing conditions, characterized in that, include: Icing detection module: Used to obtain the wind speed of the nacelle anemometer, the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit. Based on the matching relationship between the wind speed of the nacelle anemometer and the output power of the wind turbine generator, the current temperature of the nacelle and the nacelle temperature limit, it determines whether the unit is operating under icing conditions. If yes, proceed to the next step; otherwise, terminate. Speed ​​control module: used to obtain the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average. Based on the front and rear nacelle acceleration and the front and rear nacelle acceleration limit after the sliding average, it determines whether the unit is operating under ice conditions. If not, it terminates; if so, it controls the generator set speed. Torque control module: used to obtain the lateral nacelle acceleration and lateral nacelle acceleration limit after sliding average, and to determine whether the unit is operating under icing conditions based on the lateral nacelle acceleration and lateral nacelle acceleration limit after sliding average. If not, it terminates; if so, it controls the torque of the generator set. The method for obtaining the fore and aft cabin acceleration after moving average is as follows: Get the current fore-and-aft acceleration of the cabin; Take the absolute value of the fore-and-aft acceleration of the cabin; The absolute values ​​of the cabin's fore-and-aft accelerations are then averaged over a standard time interval to obtain the averaged cabin fore-and-aft accelerations. The criteria for determining whether a generator set is operating under icing conditions are based on the moving average of the front and rear nacelle accelerations and the front and rear nacelle acceleration limits. When the acceleration of the front and rear engine compartments after the sliding average is greater than the acceleration limit of the front and rear engine compartments, the accumulation time begins. The accumulation time limit is obtained, and it is determined whether the accumulation time is greater than the accumulation time limit. If it is greater, the generator speed is controlled; if it is not greater, the process is terminated.

6. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the wind turbine generator speed and torque control method as described in any one of claims 1 to 4.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the wind turbine generator speed and torque control method as described in any one of claims 1 to 4.

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