Wind turbine generator torque control method and device capable of suppressing fluctuation

Abstract

The invention belongs to the technical field of wind turbine generator control, and discloses a wind turbine generator torque control method and device capable of suppressing fluctuation, and the method comprises the steps: multiplying a machine side current deviation value change rate at a previous moment and a later moment by a machine side current deviation value at the previous moment and the later moment to obtain a machine side current transient change monitoring value; if the current pitch angle position is greater than the degree of the optimal pitch angle plus x degree, and if the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold value or not, and the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold value for continuous n times within T time; dividing the rated power of the generator by the current rotating speed of the generator to obtain a torque plan instruction value of the generator; and adding the generator torque plan instruction value and the generator torque additional instruction value to obtain a corrected generator torque instruction. According to the invention, the operation risk and the influence on the service life of the wind turbine generator converter IGBT caused by the instantaneous change of the current can be avoided, and the rapid change of the external wind speed can be coped with more gently.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine control, and in particular relates to a method and device for controlling torque of a wind turbine for suppressing fluctuations. Background Art

[0002] As the core component of the wind power generation system, the wind power converter is responsible for converting the mechanical energy of the wind turbine into electrical energy and realizing the regulation and control of electrical energy. Among them, the machine-side current, as an important parameter of the wind power converter, has an important impact on the operating efficiency and stability of the system. At the same time, due to the instability of the wind energy input of the impeller, the energy conversion process of the wind turbine generator set also fluctuates with the wind speed. The resulting instantaneous increase and decrease of the machine-side current has a great impact on the IGBT, the core key component of the wind power converter. For example, repeated large increases and decreases in the machine-side current reduce its operating life and efficiency, bringing challenges to the stable operation of the wind turbine.

[0003] The Chinese patent publication number is CN110513248A, and the name is a patent application for a method and device for controlling the pitch angle of a wind turbine with an active grid support function. The method includes: calculating the static value of the generator electromagnetic torque under the target working condition according to the target voltage, target frequency and the generator power setting value under the target voltage, and the target working condition is the working condition when the generator works in the normal power system state; subtracting the static value of the generator electromagnetic torque under the target working condition from the generator electromagnetic torque value under the current working condition to obtain the generator electromagnetic torque prevariable; calculating the pitch angle change according to the generator electromagnetic torque prevariable, and controlling the variable pitch system according to the pitch angle change. This patent application can adjust the wind turbine pitch angle in real time by pre-control, reducing the probability of overspeed failure of the generator, which is conducive to the stable operation of the wind turbine. However, this patent application cannot monitor the instantaneous changes of the machine-side current, and cannot solve the problem that the machine-side current repeatedly increases and decreases significantly, reducing its operating life and efficiency. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a torque control method and device for a wind turbine set that suppresses fluctuations, monitors instantaneous large changes by means of the transient change value of the computer side current, and directly uses it as the controller input to control the generator torque, and can timely correct the generator torque additional value according to the real-time instantaneous changes of the machine side current, so as to take corresponding protective measures.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a method for controlling torque of a wind turbine generator set to suppress fluctuations, comprising the following steps: Obtain the current deviation value of the machine side at the current moment, the current deviation value of the machine side at the previous moment, the detection cycle, the transient change threshold of the machine side current, the current pitch angle position, and the optimal pitch angle setting; Subtract the current deviation value of the machine side at the previous moment from the current deviation value of the machine side at the current moment, and divide the result by the detection period to obtain the change rate of the current deviation value of the machine side at the previous and next moments; multiply the change rate of the current deviation value of the machine side at the previous and next moments by the current deviation value of the machine side at the previous and next moments to obtain the transient change monitoring value of the machine side current; Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation. If satisfied, proceed to the next step. Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation; if satisfied, proceed to the next step; Determine whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold, and whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold for n consecutive times within T time; if the condition is not met, terminate the calculation; if the condition is met, divide the generator rated power by the current generator speed to obtain the generator torque plan instruction value; Adding the generator torque plan command value to the generator torque additional command value to obtain a modified generator torque command; The modified generator torque command is transmitted to the converter for performing torque control.

[0006] Optionally, obtain the rated value of the inverter machine side current, the inverter machine side current detection value at the current moment, and the inverter machine side current detection value at the previous moment; subtract the rated value of the inverter machine side current from the inverter machine side current detection value at the current moment to obtain the machine side current deviation value at the current moment; subtract the rated value of the inverter machine side current from the inverter machine side current detection value at the previous moment to obtain the machine side current deviation value at the previous moment.

[0007] Optionally, after filtering the machine-side current deviation value 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, and 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, and 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.

[0008] Optionally, the filter side current value at the previous moment is input to the PD controller, and the generator torque additional instruction value is obtained after passing through the PD controller.

[0009] Optionally, the generator torque additional instruction value is limited to a range from 0.95 times the rated generator torque to 1.05 times the rated generator torque.

[0010] Optionally, the detection cycle time is 0.02 seconds, T time is 5 seconds, n is 2, and x is 1 degree.

[0011] In a second aspect, the present invention provides a wind turbine torque control system for suppressing fluctuations, comprising: A data acquisition module is used to obtain the current deviation value of the machine side current at the current moment, the current deviation value of the machine side current at the previous moment, the detection cycle, the transient change threshold of the machine side current, the current pitch angle position, and the optimal pitch angle setting; A calculation module is used to subtract the current deviation value of the machine side at the previous moment from the current deviation value of the machine side at the current moment, and divide the result by the detection period to obtain the change rate of the current deviation value of the machine side at the previous moment; and multiply the change rate of the current deviation value of the machine side at the previous moment by the current deviation value of the machine side at the previous moment to obtain the transient change monitoring value of the machine side current; The first judgment module is used to judge whether the current pitch angle position is greater than the optimal pitch angle plus x degrees, if not, the calculation is terminated, if satisfied, the next step of judgment is performed; The second judgment module is used to judge whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, the calculation is terminated; if satisfied, the next judgment is performed; The third judgment module is used to judge whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold, and whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold for n consecutive times within the T time; 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 instruction value; A calculation module, used for adding the generator torque plan instruction value and the generator torque additional instruction value to obtain a modified generator torque instruction; The output module is used to transmit the modified generator torque command to the converter for performing torque control.

[0012] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for controlling the torque of a wind turbine with fluctuation suppression when executing the computer program.

[0013] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for controlling the torque of a wind turbine set with suppression of fluctuations is implemented.

[0014] In a fifth aspect, the present invention provides a computer program product comprising a computer-readable medium, wherein the computer-readable medium contains a computer-readable program code, and the program code executes any one of the methods for controlling the torque of a wind turbine generator system to suppress fluctuations.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a torque control method and device for a wind turbine set that suppresses fluctuations. The present invention aims to address the problems of shortened life of electrical and electronic components of the converter, especially IGBTs, and reduced ability to withstand current changes due to frequent and large changes in wind speed caused by instantaneous changes in the current on the machine side, which are caused by insufficient current monitoring on the existing machine side. The present invention monitors the real-time changes and trends of the current on the machine side of the wind turbine set, and reduces the short-term transient changes in the current on the machine side through torque control, thereby avoiding the operational risks and service life of the IGBT of the wind turbine converter due to instantaneous current changes, and responding to rapid changes in external wind speed more smoothly. At the same time, due to the direct monitoring of the machine side current and the corresponding direct control, the operating environment conditions of the converter IGBT can be effectively improved.

[0016] Furthermore, the present invention uses the existing machine-side current value for dynamic monitoring, and calculates the generator torque added value in parallel, without hardware modification costs. The present invention directly controls the generator torque through the transient changes of the machine-side current, thereby controlling the machine-side current, which is direct and effective. The present invention uses the machine-side current value and its change trend at different times, and judges the transient change trend by accumulating the machine-side current value detected in real time, thereby monitoring the machine-side current change in a dynamic manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

[0018] In the attached picture: Figure 1 This is a flow chart of the method steps of Example 1 of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] It should be noted that in the claims, any reference signs placed between brackets shall 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. The present application may 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 may be interpreted as names. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. The present invention is described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, a torque control method for a wind turbine generator set for suppressing fluctuations of the present invention comprises the following steps: Obtain the current deviation value of the machine side at the current moment, the current deviation value of the machine side at the previous moment, the detection cycle, the transient change threshold of the machine side current, the current pitch angle position, and the optimal pitch angle setting; Subtract the current deviation value of the machine side at the previous moment from the current deviation value of the machine side at the current moment, and divide the result by the detection period to obtain the change rate of the current deviation value of the machine side at the previous and next moments; multiply the change rate of the current deviation value of the machine side at the previous and next moments by the current deviation value of the machine side at the previous and next moments to obtain the transient change monitoring value of the machine side current; Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation. If satisfied, proceed to the next step. Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation; if satisfied, proceed to the next step; Determine whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold, and whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold for n consecutive times within T time; if the condition is not met, terminate the calculation; if the condition is met, divide the generator rated power by the current generator speed to obtain the generator torque plan instruction value; Adding the generator torque plan command value to the generator torque additional command value to obtain a modified generator torque command; The modified generator torque command is transmitted to the converter for performing torque control.

[0023] The present invention directly controls the generator torque through the transient change of the machine-side current, thereby controlling the machine-side current, which is direct and effective. The present invention uses the machine-side current value and its change trend at different times, and judges the transient change trend by accumulating the machine-side current value detected in real time, thereby monitoring the machine-side current change in a dynamic manner.

[0024] Example 1 Combine the following Figure 1 The specific implementation modes of the present invention are further described.

[0025] Step 1: Obtain the rated current Ir of the converter.

[0026] Step 2: Detect the current Icn of the converter machine side at the current moment.

[0027] Step 3: Detect the converter machine-side current Icb at the previous moment.

[0028] Step 4: Subtract the rated value of the inverter machine-side current from the inverter machine-side current detection value at the current moment to obtain the current deviation value Idin of the inverter machine-side current at the current moment, that is, Idin=Icn-Ir.

[0029] Step 5: Subtract the inverter machine-side current detection value at the previous moment from the inverter machine-side current rated value to obtain the inverter machine-side current deviation value Idib at the previous moment, that is, Idib=Icb-Ir.

[0030] Step 6: Filter Idin to obtain Idinf, and filter Idib to obtain Idibf.

[0031] Step 7: Subtract the filter side current value Idibf at the previous moment from the current value Idinf at the current moment to obtain the filter side current deviation value Idl before and after the previous moment, that is, Idl=Idinf-Idibf.

[0032] Step 8: Get the detection cycle.

[0033] Step 9: Divide the current deviation value Idl on the filter side before and after by the detection cycle cycle to obtain the change rate of the current deviation value Idldt on the filter side before and after, that is, Idldt=Idl / cycle.

[0034] Step 10: Multiply the filter side current deviation value change rate Idldt before and after by the filter side current deviation value Idl before and after to obtain the machine side current transient change monitoring value Im, that is, Im=Idl*Idldt.

[0035] Step 11: Obtain the generator-side current transient change threshold Im_threshold.

[0036] Step 12: Detect the current pitch angle position Pitch.

[0037] Step 13: Get the optimal pitch angle and set Pitch_opt.

[0038] Among them, the optimal pitch angle setting Pitch_opt is the unit control design value, which is directly read and obtained.

[0039] Step 14: Determine whether Pitch is greater than Pitch_opt+1 degree.

[0040] Step 15: If not, it means that the wind speed has not entered the range above the rated speed, and the calculation is terminated.

[0041] Step 16: If yes, determine whether Im is greater than Im_threshold, and whether Im>Im_threshold for n consecutive times within T time.

[0042] Step 17: If not, it means that the converter electrical and electronic components can temporarily withstand the transient current changes in a short period of time and terminate the operation.

[0043] Step 18: If yes, then input the filtered machine-side current deviation value Idinf obtained in step 6 at the current moment to the machine-side current-generator additional torque PD controller, whose 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.

[0044] Step 19: After passing through the PD controller, the generator torque additional instruction value TorqueDadd is obtained, and the calculated TorqueDadd is limited to the range of (Torquelimitup, Torquelimitdown).

[0045] Step 20: Get the generator rated power Prated.

[0046] Step 21: Detect the current generator speed Speed.

[0047] 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.

[0048] Step 23: Add the generator torque plan instruction value TorqueD and the generator torque additional instruction value TorqueDadd to obtain the modified generator torque instruction TorqueD_final, that is, TorqueD_final=TorqueD+TorqueDadd.

[0049] Step 24: Transmit the modified generator torque command to the converter to perform torque control.

[0050] The present invention uses the computer side current transient change value to monitor the instantaneous large change situation, and directly uses it as the controller input to control the generator torque. The PD controller used in the present invention aims to eliminate the difference between the actual machine side current and the rated current as much as possible, and calculates the additional instructions for the generator torque control. However, it is not limited to the PD controller, and includes other control methods that aim to minimize the machine side current fluctuation.

[0051] The present invention uses the detection of the actual action of the pitch angle and that it is greater than 1 degree as a judgment condition as a prerequisite, ensuring that this algorithm is effective when the machine-side current reaches near or above the rated current above the rated wind speed range. The present invention uses a method of exceeding the threshold value several times in a row within a set time to determine that the machine-side current has frequently and significantly changed multiple times within this time period, thereby avoiding frequent corrections to the generator torque command. The present invention uses a constant power torque control method above the rated wind speed, that is, the generator torque control command aims to maintain constant power, minimizing the impact of the generator torque correction on the output power fluctuation.

[0052] The present invention limits the calculated additional command value of the generator torque control to avoid inappropriate calculated values ​​affecting the normal operation of the wind turbine. The present invention detects the machine-side current value at different times and calculates its change trend to characterize the transient change of the machine-side current. The present invention detects the machine-side current value at different times and performs filtering processing before participating in the control to avoid high-frequency harmonics and other signals affecting the instantaneous control of the generator torque.

[0053] The threshold value of transient change of the machine-side current of the present invention is determined by a two-dimensional or three-dimensional table lookup at different rotation speeds or different pitch angles.

[0054] Example 2 This embodiment is based on the torque control method for wind turbines with suppressed fluctuations in Embodiment 1, wherein cycle=0.02 seconds, T=5 seconds, n=2, Torquelimitup=1.05*rated generator torque, and Torquelimitdown=0.95*rated generator torque.

[0055] Example 3 Based on the torque control method for a wind turbine generator set for suppressing fluctuations in Embodiment 1, a torque control system for a wind turbine generator set for suppressing fluctuations is disclosed, comprising: A data acquisition module is used to obtain the current deviation value of the machine side current at the current moment, the current deviation value of the machine side current at the previous moment, the detection cycle, the transient change threshold of the machine side current, the current pitch angle position, and the optimal pitch angle setting; A calculation module is used to subtract the current deviation value of the machine side at the previous moment from the current deviation value of the machine side at the current moment, and divide the result by the detection period to obtain the change rate of the current deviation value of the machine side at the previous moment; and multiply the change rate of the current deviation value of the machine side at the previous moment by the current deviation value of the machine side at the previous moment to obtain the transient change monitoring value of the machine side current; The first judgment module is used to judge whether the current pitch angle position is greater than the optimal pitch angle plus x degrees, if not, the calculation is terminated, if satisfied, the next step of judgment is performed; The second judgment module is used to judge whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, the calculation is terminated; if satisfied, the next judgment is performed; The third judgment module is used to judge whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold, and whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold for n consecutive times within the T time; 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 instruction value; A calculation module, used for adding the generator torque plan instruction value and the generator torque additional instruction value to obtain a modified generator torque instruction; The output module is used to transmit the modified generator torque command to the converter for performing torque control.

[0056] Example 4 The purpose of this embodiment is to provide an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the torque control method for a wind turbine set with suppressed fluctuations when executing the computer program.

[0057] Example 5 The purpose of this embodiment is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the torque control method for a wind turbine generator set with suppressed fluctuation is implemented.

[0058] Example 6 The purpose of this embodiment is to provide a computer program product including a computer-readable medium, on which a computer-readable program code is contained, and the program code executes any one of the torque control methods for a wind turbine generator system with suppressed fluctuations.

[0059] The steps involved in the devices of the above embodiments 3, 4, 5 and 6 correspond to those of the method embodiment 1. For the specific implementation methods, please refer to the relevant description part of embodiment 1.

[0060] It should be understood by those skilled in the art that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks. These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes. These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0061] Unless otherwise specified, the working modes or control modes involved in the above embodiments are all conventional working modes or control modes in the art.

[0062] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for controlling torque of a wind turbine generator set to suppress fluctuations, characterized in that: The following steps are involved: Obtain the current deviation value of the machine side at the current moment, the current deviation value of the machine side at the previous moment, the detection cycle, the transient change threshold of the machine side current, the current pitch angle position, and the optimal pitch angle setting; Subtract the current deviation value of the machine side at the previous moment from the current deviation value of the machine side at the current moment, and divide the result by the detection period to obtain the change rate of the current deviation value of the machine side at the previous and next moments; multiply the change rate of the current deviation value of the machine side at the previous and next moments by the current deviation value of the machine side at the previous and next moments to obtain the transient change monitoring value of the machine side current; Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation. If satisfied, proceed to the next step. Determine whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, terminate the calculation; if satisfied, proceed to the next step; Determine whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold, and whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold for n consecutive times within T time; if the condition is not met, terminate the calculation; if the condition is met, divide the generator rated power by the current generator speed to obtain the generator torque plan instruction value; Adding the generator torque plan command value to the generator torque additional command value to obtain a modified generator torque command; The modified generator torque command is transmitted to the converter for performing torque control.

2. A method for controlling wind turbine torque to suppress fluctuations according to claim 1, characterized in that: Obtain the rated value of the inverter machine-side current, the inverter machine-side current detection value at the current moment, and the inverter machine-side current detection value at the previous moment; subtract the rated value of the inverter machine-side current from the inverter machine-side current detection value at the current moment to obtain the machine-side current deviation value at the current moment; subtract the rated value of the inverter machine-side current from the inverter machine-side current detection value at the previous moment to obtain the machine-side current deviation value at the previous moment.

3. A method for controlling torque of a wind turbine generator set to suppress fluctuations according to claim 1, characterized in that: After filtering the machine side current deviation value 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, and 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, and then the filtered machine side current deviation value at the previous and next moments is divided by the detection period to obtain the filter machine side current deviation value change rate at the previous and next moments.

4. A method for controlling torque of a wind turbine generator set to suppress fluctuations according to claim 3, characterized in that: The filter side current value at the previous moment is input to the PD controller, and the generator torque additional instruction value is obtained after passing through the PD controller.

5. A method for controlling torque of a wind turbine generator set to suppress fluctuations according to claim 4, characterized in that: The generator torque additional instruction value is limited to the range of 0.95 times the rated generator torque to 1.05 times the rated generator torque.

6. A method for controlling torque of a wind turbine generator set to suppress 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.

7. A wind turbine torque control system for suppressing fluctuations, characterized in that: include: A data acquisition module is used to obtain the current deviation value of the machine side current at the current moment, the current deviation value of the machine side current at the previous moment, the detection cycle, the transient change threshold of the machine side current, the current pitch angle position, and the optimal pitch angle setting; A calculation module is used to subtract the current deviation value of the machine side at the previous moment from the current deviation value of the machine side at the current moment, and divide the result by the detection period to obtain the change rate of the current deviation value of the machine side at the previous moment; and multiply the change rate of the current deviation value of the machine side at the previous moment by the current deviation value of the machine side at the previous moment to obtain the transient change monitoring value of the machine side current; The first judgment module is used to judge whether the current pitch angle position is greater than the optimal pitch angle plus x degrees, if not, the calculation is terminated, if satisfied, the next step of judgment is performed; The second judgment module is used to judge whether the current pitch angle position is greater than the optimal pitch angle plus x degrees. If not, the calculation is terminated; if satisfied, the next judgment is performed; The third judgment module is used to judge whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold, and whether the machine-side current transient change monitoring value is greater than the machine-side current transient change threshold for n consecutive times within the T time; 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 instruction value; A calculation module, used for adding the generator torque plan instruction value and the generator torque additional instruction value to obtain a modified generator torque instruction; The output module is used to transmit the modified generator torque command to the converter for performing torque control.

8. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the torque control method for a wind turbine set for suppressing fluctuations as claimed in any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for controlling the torque of a wind turbine generator set with suppression of fluctuations according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer readable medium, characterized in that The computer-readable medium contains a computer-readable program code, and the program code executes the torque control method for a wind turbine generator set for suppressing fluctuations as claimed in any one of claims 1 to 6.

Images