A method and device for controlling torque of a wind turbine to suppress fluctuations

Abstract

The present application belongs to the field of wind turbine control technology, and discloses a wind turbine torque control method and device for suppressing fluctuation, which comprises the following steps: multiplying the current deviation rate of the machine side current at the previous and next time by the deviation value of the machine side current at the previous and next time to obtain a machine side current transient change monitoring value; if the current pitch angle position is greater than the optimal pitch angle plus x degrees, if the machine side current transient change monitoring value is greater than the machine side current transient change threshold value, and the machine side current transient change monitoring value is greater than the machine side current transient change threshold value for n times within T time; dividing the rated power of the generator by the current generator speed to obtain a generator torque planning instruction value; adding the generator torque planning instruction value and the generator torque additional instruction value to obtain a corrected generator torque instruction. The present application can avoid the operation risk and service life influence of the wind turbine converter IGBT caused by the current transient change, and more gently cope with the rapid change of external wind speed.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine control technology, specifically relating to a method and device for controlling the torque of a wind turbine to suppress fluctuations. Background Technology

[0002] As a core component of wind power generation systems, wind turbine converters are responsible for converting the mechanical energy of wind turbines into electrical energy and for regulating and controlling this electrical energy. Among these parameters, the turbine-side current is a crucial parameter that significantly impacts the system's operating efficiency and stability. Furthermore, due to the instability of wind energy input to the turbine rotor, the energy conversion process fluctuates with wind speed. This results in instantaneous increases and decreases in the turbine-side current, which significantly affects the IGBTs, a critical component of the wind turbine converter. Repeated and significant increases and decreases in the turbine-side current can reduce its service life and efficiency, posing a challenge to the stable operation of the wind turbine.

[0003] Chinese patent publication number CN110513248A, entitled "A Method and Device for Controlling the Pitch Angle of a Wind Turbine with Active Grid Support Function," describes a method comprising: calculating a static value of the generator's electromagnetic torque under a target operating condition, based on a target voltage, a target frequency, and a generator power setpoint at the target voltage; subtracting the static value of the generator's electromagnetic torque under the target operating condition from the value of the generator's electromagnetic torque under the current operating condition to obtain a pre-variable of the generator's electromagnetic torque; calculating the pitch angle change based on the pre-variable of the generator's electromagnetic torque; and controlling the pitch system based on the pitch angle change. This patent application, through pre-control, can adjust the wind turbine pitch angle in real time, reducing the probability of generator overspeed failure and contributing to the stable operation of the wind turbine. However, this patent application cannot monitor instantaneous changes in the turbine-side current, and therefore cannot solve the problem of repeated large increases and decreases in the turbine-side current reducing its service life and efficiency. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the present invention aims to provide a method and device for controlling the torque of a wind turbine to suppress fluctuations. The method monitors instantaneous large changes in the transient current value on the computer side and directly uses it as the controller input to control the generator torque. It can promptly correct the generator torque additional value according to the real-time instantaneous changes in the turbine side current, thereby taking corresponding protective measures.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a method for controlling the torque of a wind turbine to suppress fluctuations, comprising the following steps:

[0007] Acquire the current turbine-side current deviation value, the previous turbine-side current deviation value, the detection cycle, the turbine-side current transient change threshold, the current pitch angle position, and the optimal pitch angle setting;

[0008] Subtract the machine-side current deviation value from the machine-side current deviation value at the current moment, and divide the result by the detection period to obtain the rate of change of the machine-side current deviation value between the two moments; multiply the rate of change of the machine-side current deviation value between the two moments by the machine-side current deviation value between the two moments to obtain the transient change monitoring value of the machine-side current.

[0009] Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it is not satisfied, terminate the calculation; if it is satisfied, proceed to the next step.

[0010] Determine if the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation; if so, proceed to the next step.

[0011] Determine whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current, and whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current for n consecutive times within time T. If the condition is not met, the calculation is terminated; if the condition is met, the generator rated power is divided by the current generator speed to obtain the generator torque plan command value.

[0012] The generator torque plan command value is added to the generator torque additional command value to obtain the corrected generator torque command;

[0013] The generator torque correction command is transmitted to the converter for torque control.

[0014] Optionally, the rated value of the converter machine-side current, the current value of the converter machine-side current detected at the current moment, and the previous value of the converter machine-side current detected at the previous moment are obtained; the rated value of the converter machine-side current is subtracted from the current value of the converter machine-side current detected at the current moment to obtain the current deviation value of the machine-side current at the current moment; the rated value of the converter machine-side current is subtracted from the previous value of the converter machine-side current detected at the previous moment to obtain the current deviation value of the machine-side current at the previous moment.

[0015] Optionally, after filtering the current deviation value of the machine side current at the current moment and the machine side current deviation value at the previous moment, the filtered machine side current value at the current moment and the filtered machine side current value at the previous moment are obtained respectively. The filtered machine side current value at the current moment and the filtered machine side current value at the previous moment are subtracted to obtain the filtered machine side current deviation value at the previous and next moments. Then, the filtered machine side current deviation value at the previous and next moments is divided by the detection period to obtain the change rate of the filtered machine side current deviation value at the previous and next moments.

[0016] Optionally, the filter-side current value of the previous moment is input to the PD controller, and the generator torque additional command value is obtained after passing through the PD controller.

[0017] Optionally, the additional generator torque command value is limited to the range of 0.95 times the rated generator torque to 1.05 times the rated generator torque.

[0018] Optionally, the detection cycle time is 0.02 seconds, T time is 5 seconds, n is 2, and x is 1 degree.

[0019] Secondly, the present invention provides a wind turbine torque control system for suppressing fluctuations, comprising:

[0020] The data acquisition module is used to obtain the current deviation value of the engine side current at the current moment, the deviation value of the engine side current at the previous moment, the detection cycle, the threshold for transient change of engine side current, the current pitch angle position, and the optimal pitch angle setting.

[0021] The calculation module is used to subtract the machine-side current deviation value from the machine-side current deviation value at the current moment, and divide the result by the detection period to obtain the rate of change of the machine-side current deviation value between the two moments; multiplying the rate of change of the machine-side current deviation value between the two moments by the machine-side current deviation value between the two moments yields the transient change monitoring value of the machine-side current.

[0022] The first judgment module is used to determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it does not meet the requirement, the calculation is terminated; if it does meet the requirement, the next judgment is performed.

[0023] The second judgment module is used to determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it does not meet the requirement, the calculation is terminated; if it does meet the requirement, the next judgment is performed.

[0024] The third judgment module is used to determine whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current, and whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current for n consecutive times within time T. If the condition is not met, the calculation is terminated; if the condition is met, the rated power of the generator is divided by the current generator speed to obtain the generator torque plan command value.

[0025] The calculation module is used to add the generator torque plan command value to the generator torque additional command value to obtain the corrected generator torque command;

[0026] The output module is used to transmit the generator torque correction command to the converter for torque control.

[0027] Thirdly, the present invention provides an electronic device including 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 the wind turbine torque control method for suppressing fluctuations.

[0028] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the wind turbine torque control method for suppressing fluctuations.

[0029] Fifthly, the present invention provides a computer program product including a computer-readable medium, wherein the computer-readable medium contains computer-readable program code, the program code executing any of the wind turbine torque control methods for suppressing fluctuations.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention provides a method and device for suppressing fluctuations in wind turbine torque control. It addresses the problem of shortened lifespan and reduced current tolerance of converter electrical and electronic components, especially IGBTs, caused by sudden and significant changes in turbine current due to frequent wind speed variations, resulting from insufficient monitoring of existing turbine-side current. This invention monitors the real-time changes and trends of the turbine-side current and uses torque control to reduce short-term transient changes in the turbine-side current. This avoids the operational risks and lifespan impacts on the wind turbine converter IGBTs caused by sudden current changes, and provides a smoother response to rapid changes in external wind speed. Furthermore, by directly monitoring and controlling the turbine-side current, it effectively improves the operating environment conditions of the converter IGBTs.

[0032] Furthermore, this invention uses existing generator-side current values ​​for dynamic monitoring and calculates the generator torque add-on value in parallel, requiring no hardware modification costs. This invention directly controls the generator torque based on the transient changes in generator-side current, thus controlling the generator-side current directly and effectively. This invention uses generator-side current values ​​and their changing trends at different times, and determines the transient change trend by accumulating the real-time detected generator-side current values, thereby dynamically monitoring changes in generator-side current. Attached Figure Description

[0033] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way.

[0034] In the attached diagram:

[0035] Figure 1 This is a flowchart of the method steps in Embodiment 1 of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. This application can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] The present invention will now be described in detail with reference to the accompanying drawings.

[0041] like Figure 1 As shown, a wind turbine torque control method for suppressing fluctuations according to the present invention includes the following steps:

[0042] Acquire the current turbine-side current deviation value, the previous turbine-side current deviation value, the detection cycle, the turbine-side current transient change threshold, the current pitch angle position, and the optimal pitch angle setting;

[0043] Subtract the machine-side current deviation value from the machine-side current deviation value at the current moment, and divide the result by the detection period to obtain the rate of change of the machine-side current deviation value between the two moments; multiply the rate of change of the machine-side current deviation value between the two moments by the machine-side current deviation value between the two moments to obtain the transient change monitoring value of the machine-side current.

[0044] Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it is not satisfied, terminate the calculation; if it is satisfied, proceed to the next step.

[0045] Determine if the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation; if so, proceed to the next step.

[0046] Determine whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current, and whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current for n consecutive times within time T. If the condition is not met, the calculation is terminated; if the condition is met, the generator rated power is divided by the current generator speed to obtain the generator torque plan command value.

[0047] The generator torque plan command value is added to the generator torque additional command value to obtain the corrected generator torque command;

[0048] The generator torque correction command is transmitted to the converter for torque control.

[0049] This invention directly controls the generator torque by monitoring the transient changes in the generator-side current, thereby controlling the generator-side current directly and effectively. The invention uses the generator-side current values ​​and their changing trends at different times, and determines the transient change trend by accumulating the real-time detected generator-side current values, thus monitoring generator-side current changes dynamically.

[0050] Example 1

[0051] The following is combined Figure 1 The specific embodiments of the present invention will be further described below.

[0052] Step 1: Obtain the rated value of the converter's machine-side current Ir.

[0053] Step 2: Detect the current Icn on the converter side at the current moment.

[0054] Step 3: Detect the converter machine-side current Icb at the previous moment.

[0055] Step 4: Subtract the rated value of the converter's machine-side current from the current value of the current measured value of the converter's machine-side current to obtain the current deviation value of the machine-side current Idin at the current time, i.e., Idin = Icn - Ir.

[0056] Step 5: Subtract the current detection value of the converter machine side from the current rated value of the converter machine side at the previous moment to obtain the current deviation value of the machine side at the previous moment, i.e., Idib = Icb - Ir.

[0057] Step 6: Filter Idin to obtain Idinf, and filter Idib to obtain Idibf.

[0058] Step 7: Subtract the filter-side current value Idibf from the filter-side current value Idinf at the current moment to obtain the filter-side current deviation value Idl between the two moments, i.e., Idl = Idinf - Idibf.

[0059] Step 8: Obtain the detection cycle.

[0060] Step 9: Divide the filter side current deviation value Idl at the previous and next time points by the detection period cycle to obtain the rate of change of the filter side current deviation value Idldt at the previous and next time points, that is, Idldt=Idl / cycle.

[0061] Step 10: Multiply the rate of change of the filter side current deviation value Idldt at the previous and next time times by the filter side current deviation value Idl at the previous and next time times to obtain the transient change monitoring value Im of the filter side current, that is, Im=Idl*Idldt.

[0062] Step 11: Obtain the transient change threshold Im_threshold for the machine-side current.

[0063] Step 12: Detect the current pitch angle position.

[0064] Step 13: Obtain the optimal pitch angle setting Pitch_opt.

[0065] Among them, the optimal pitch angle setting Pitch_opt is the unit control design value, which is obtained directly.

[0066] Step 14: Determine if the pitch is greater than Pitch_opt+1 degrees.

[0067] Step 15: If not, it means that the wind speed range above the rated speed has not been entered, and the calculation is terminated.

[0068] Step 16: If so, determine whether Im is greater than Im_threshold, and whether Im>Im_threshold occurs n times consecutively within time T.

[0069] Step 17: If not, it means that the electrical and electronic components of the converter can temporarily withstand the transient change in current for a short period of time, and the operation is terminated.

[0070] Step 18: If so, input the filtered machine-side current deviation value Idinf obtained in step 6 to the machine-side current-generator additional torque PD controller. The goal is to eliminate the difference Idinf as much as possible. The controller parameters are determined after debugging based on the IGBT rated current, withstand current, etc.

[0071] Step 19: After passing through the PD controller, obtain the generator torque additional command value TorqueDadd. The calculated TorqueDadd is limited to the range of (Torquelimitup, Torquelimitdown).

[0072] Step 20: Obtain the generator's rated power, Prated.

[0073] Step 21: Detect the current generator speed (Speed).

[0074] Step 22: Divide the generator rated power Prated by the current generator speed Speed ​​to obtain the generator torque plan command value TorqueD, that is, TorqueD=Prated / Speed.

[0075] Step 23: Add the generator torque plan command value TorqueD to the generator torque additional command value TorqueDadd to obtain the modified generator torque command TorqueD_final, that is, TorqueD_final = TorqueD + TorqueDadd.

[0076] Step 24: Transmit the generator torque correction command to the converter to perform torque control.

[0077] This invention monitors sudden, large changes in current by using the transient change value of the computer-side current and directly uses it as the controller input to control the generator torque. The PD controller used in this invention aims to minimize the difference between the actual generator-side current and the rated current, and calculates additional commands for generator torque control. However, it is not limited to the PD controller and includes other control methods aimed at minimizing generator-side current fluctuations.

[0078] This invention uses the detection of actual pitch angle movement greater than 1 degree as a prerequisite to ensure the algorithm's effectiveness when the turbine-side current reaches or exceeds the rated current above the rated wind speed range. This invention determines frequent and significant changes in turbine-side current within a set time period by repeatedly exceeding a threshold, thus avoiding frequent corrections to the generator torque command. Above the rated wind speed, this invention employs a constant power torque control method, meaning the generator torque control command aims to maintain constant power, minimizing the impact of generator torque corrections on output power fluctuations.

[0079] This invention limits the calculated generator torque control command values ​​to prevent inappropriate calculations from affecting the normal operation of the wind turbine. This invention characterizes the transient changes in generator current by detecting the generator-side current values ​​at different times and calculating their changing trends. This invention filters the generator-side current values ​​detected at different times before incorporating them into the control, preventing high-frequency harmonics and other signals from affecting the instantaneous control of the generator torque.

[0080] The transient change threshold of the engine-side current in this invention is determined by a two-dimensional or three-dimensional lookup table based on different rotational speeds or different pitch angles.

[0081] Example 2

[0082] This embodiment is based on the wind turbine torque control method for suppressing fluctuations in Embodiment 1, where cycle = 0.02 seconds, T = 5 seconds, n = 2, Torquelimitup = 1.05 * rated generator torque, and Torquelimitdown = 0.95 * rated generator torque.

[0083] Example 3

[0084] Based on the wind turbine torque control method for suppressing fluctuations in Example 1, a wind turbine torque control system for suppressing fluctuations is disclosed, comprising:

[0085] The data acquisition module is used to obtain the current deviation value of the engine side current at the current moment, the deviation value of the engine side current at the previous moment, the detection cycle, the threshold for transient change of engine side current, the current pitch angle position, and the optimal pitch angle setting.

[0086] The calculation module is used to subtract the machine-side current deviation value from the machine-side current deviation value at the current moment, and divide the result by the detection period to obtain the rate of change of the machine-side current deviation value between the two moments; multiplying the rate of change of the machine-side current deviation value between the two moments by the machine-side current deviation value between the two moments yields the transient change monitoring value of the machine-side current.

[0087] The first judgment module is used to determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it does not meet the requirement, the calculation is terminated; if it does meet the requirement, the next judgment is performed.

[0088] The second judgment module is used to determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it does not meet the requirement, the calculation is terminated; if it does meet the requirement, the next judgment is performed.

[0089] The third judgment module is used to determine whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current, and whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current for n consecutive times within time T. If the condition is not met, the calculation is terminated; if the condition is met, the rated power of the generator is divided by the current generator speed to obtain the generator torque plan command value.

[0090] The calculation module is used to add the generator torque plan command value to the generator torque additional command value to obtain the corrected generator torque command;

[0091] The output module is used to transmit the generator torque correction command to the converter for torque control.

[0092] Example 4

[0093] The purpose of this embodiment is to provide an electronic device, including 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 the wind turbine torque control method for suppressing fluctuations.

[0094] Example 5

[0095] The purpose of this embodiment is to provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the wind turbine torque control method for suppressing fluctuations.

[0096] Example 6

[0097] The purpose of this embodiment is to provide a computer program product including a computer-readable medium, wherein the computer-readable medium contains computer-readable program code that executes any of the wind turbine torque control methods for suppressing fluctuations.

[0098] The steps and methods involved in the apparatuses of the above embodiments 3, 4, 5 and 6 correspond to those in embodiment 1. For specific implementation details, please refer to the relevant description section of embodiment 1.

[0099] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0100] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0103] Unless otherwise specified, the working methods or control methods involved in the above embodiments are conventional working methods or control methods in the art.

[0104] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling the torque of a wind turbine to suppress fluctuations, characterized in that, Includes the following steps: Acquire the current turbine-side current deviation value, the previous turbine-side current deviation value, the detection cycle, the threshold for transient changes in turbine-side current, the current pitch angle position, and the optimal pitch angle setting; Subtract the machine-side current deviation value from the machine-side current deviation value at the current moment, and divide the result by the detection period to obtain the rate of change of the machine-side current deviation value between the two moments; multiply the rate of change of the machine-side current deviation value between the two moments by the machine-side current deviation value between the two moments to obtain the transient change monitoring value of the machine-side current. Determine if the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation; if so, proceed to the next step. Determine whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current, and whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current for n consecutive times within time T. If the condition is not met, the calculation is terminated. If the condition is met, the filtered generator side current value of the previous moment is input to the PD controller, and the generator torque additional command value is obtained after passing through the PD controller. Divide the generator's rated power by the current generator speed to obtain the generator torque plan command value; add the generator torque plan command value to the generator torque additional command value to obtain the corrected generator torque command. The generator torque correction command is transmitted to the converter for torque control.

2. The wind turbine torque control method for suppressing fluctuations according to claim 1, characterized in that, Obtain the rated value of the converter's machine-side current, the current value of the converter's machine-side current at the current moment, and the previous value of the converter's machine-side current at the previous moment; subtract the rated value of the converter's machine-side current from the current value of the converter's machine-side current at the current moment to obtain the current deviation value of the machine-side current at the current moment; subtract the rated value of the converter's machine-side current from the previous value of the converter's machine-side current at the previous moment to obtain the current deviation value of the machine-side current at the previous moment.

3. The wind turbine torque control method for suppressing fluctuations according to claim 1, characterized in that, After filtering the current deviation value of the machine side at the current moment and the current deviation value of the machine side at the previous moment, the filtered current value of the machine side at the current moment and the filtered current value of the machine side at the previous moment are obtained respectively. The current deviation value of the machine side at the current moment and the filtered current value of the machine side at the previous moment are subtracted to obtain the current deviation value of the machine side at the previous and next moments. The current deviation value of the machine side at the previous and next moments is divided by the detection period to obtain the rate of change of the current deviation value of the machine side at the previous and next moments.

4. The wind turbine torque control method for suppressing fluctuations according to claim 1, characterized in that, The additional generator torque command value is limited to the range of 0.95 times the rated generator torque to 1.05 times the rated generator torque.

5. The wind turbine torque control method for suppressing fluctuations according to claim 1, characterized in that, The detection cycle time is 0.02 seconds, T time is 5 seconds, n is 2, and x is 1 degree.

6. A torque control system for wind turbine generators that suppresses fluctuations, characterized in that, include: The data acquisition module is used to obtain the current deviation value of the engine side current at the current moment, the deviation value of the engine side current at the previous moment, the detection cycle, the threshold for transient change of engine side current, the current pitch angle position, and the optimal pitch angle setting. The calculation module is used to subtract the machine-side current deviation value from the machine-side current deviation value at the current moment, and divide the result by the detection period to obtain the rate of change of the machine-side current deviation value between the two moments; multiplying the rate of change of the machine-side current deviation value between the two moments by the machine-side current deviation value between the two moments yields the transient change monitoring value of the machine-side current. The first judgment module is used to determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If it does not meet the requirement, the calculation is terminated; if it does meet the requirement, the next judgment is performed. The second judgment module is used to determine whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current, and whether the transient change monitoring value of the generator side current is greater than the transient change threshold of the generator side current for n consecutive times within time T. If the condition is not met, the calculation is terminated; if the condition is met, the filtered generator side current value of the previous moment is input to the PD controller, and the generator torque additional command value is obtained after passing through the PD controller. The calculation module is used to divide the generator's rated power by the current generator speed to obtain the generator torque plan command value; and to add the generator torque plan command value to the generator torque additional command value to obtain the corrected generator torque command. The output module is used to transmit the generator torque correction command to the converter for torque control.

7. An electronic device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the wind turbine torque control method for suppressing fluctuations as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the wind turbine torque control method for suppressing fluctuations as described in any one of claims 1-5.

9. A computer program product comprising a computer-readable medium, characterized in that, The computer-readable medium contains computer-readable program code that performs the wind turbine torque control method for suppressing fluctuations as described in any one of claims 1-5.

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