Dynamic shutdown control method, system, device and storage medium for wind turbine

Abstract

The present invention belongs to the technical field of wind turbines, and relates to a dynamic shutdown control method for a wind turbine, comprising the following steps: S1, real-time monitoring of the collected unit status and cabin vibration data, filtering the collected cabin vibration data, and obtaining the filtered measurement quantity; S2, checking the running status of the unit, judging whether it is in the shutdown state, if not in the shutdown state, returning to S1; if it is in the shutdown state, executing S3; S3, judging whether it is a grid-off fault, if not, adding a pitch rate additional value during the shutdown process, which is adjusted with the filtered measurement quantity; if it is a grid-off fault, the pitch rate is first set with the upper limit pitch rate, and an additional pitch rate value is added, which is dynamically adjusted with the filtered measurement quantity until the wind turbine reaches the maximum pitch position and the pitch stops. To achieve the purpose of reducing vibration, reducing unit load impact and safety risks.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbines, and in particular relates to a dynamic shutdown control method, system, equipment and storage medium of a wind turbine. Background Art

[0002] As my country's wind resource development shifts to low wind speed areas, low wind speed wind turbines have become the main trend in the future development of wind turbines. At the same time, in order to reduce costs, it is necessary to continuously increase the power generation of a single unit. Therefore, an important development trend of wind turbines is to increase the height of wind turbine towers in order to obtain more wind resources at a higher altitude.

[0003] However, there is also a big problem with high-flexible towers. Due to their higher height, the tower frequency is lower. Under the same external wind conditions and operating conditions, the vibration problem of the unit is more prominent than that of conventional units. Once it is improperly operated or impacted by changes in external wind conditions, it will cause long-term vibration of the tower, causing the load of large components at the head and the load of the tower foundation to exceed the limit. Among them, a common operating condition that easily causes continuous oscillation is the shutdown condition. When the unit is operating normally, its wind load input and power generation output are balanced, but once the unit is shut down, if it is not properly controlled, it is easy to cause energy imbalance of the unit, resulting in continuous high-amplitude vibration. Summary of the invention

[0004] The purpose of the present invention is to provide a dynamic shutdown control method, system, device and storage medium for a wind turbine generator, which solves the problem that the shutdown process easily causes energy imbalance of the unit and brings about continuous high-amplitude vibration.

[0005] The present invention is achieved through the following technical solutions:

[0006] A dynamic shutdown control method for a wind turbine generator comprises the following steps:

[0007] S1. Real-time monitoring of the collected unit operation status and cabin vibration data, filtering the collected cabin vibration data to obtain filtered measurement quantities;

[0008] S2, check the running status of the unit to determine whether it is in the shutdown state. If it is not in the shutdown state, return to S1; if it is in the shutdown state, execute S3;

[0009] S3. Determine the shutdown level and judge whether it is an off-grid fault. There are two situations:

[0010] Case 1: If it is not a grid-off fault, the additional value of the pitch rate is increased, which is adjusted according to the filtered measurement value until the wind turbine reaches the maximum pitch position and the pitch is stopped;

[0011] Case 2: If it is a grid-off fault, the pitch rate is first set to the upper limit pitch rate, and then the pitch rate additional value is increased until the wind turbine reaches the maximum pitch position and the pitch is stopped.

[0012] Further, in S1, filtering is performed on the collected x-direction cabin vibration data and the y-direction cabin vibration data to obtain filtered measurement quantities, which are recorded as Accx and Accy, respectively.

[0013] Further, situation 1 specifically includes the following steps:

[0014] (1.1) On the basis of the original pitch rate, a positive pitch rate additional value ΔPR is added; then the pitch rate value in real time is: PR = PR0 + ΔPR;

[0015] Wherein, ΔPR=f1(Accx,Accy), PR0 is the original pitch rate, PR0 remains unchanged, and ΔPR is dynamically adjusted; Accx is the filtered measurement value obtained after filtering the collected x-direction cabin vibration data, and Accy is the filtered measurement value obtained after filtering the collected y-direction cabin vibration data;

[0016] (1.2) The pitch angle continues to increase, and the current pitch angle is observed in real time. When the pitch angle PA < PAset2, the method of step (1.1) is continued;

[0017] When the pitch angle PAset2≤PA≤PAset3, ΔPR=PR0;

[0018] (1.3) The pitch angle continues to increase. When the pitch angle PA>PAset3, the wind turbine reaches the maximum pitch position, the pitch rate is 0, and the pitch stops.

[0019] Further, the second situation specifically includes the following steps:

[0020] (2.1) Check whether the pitch angle PA is less than the set value PA set1. If it is less than the set value PA set1, the pitch rate PR is determined according to the maximum pitch rate upper limit, and PR = PRmax;

[0021] (2.2) The pitch angle PA continues to increase. When the pitch angle PA is greater than the set value PA set1, a negative pitch rate value ΔPR is added to the pitch rate PAmax set value.

[0022] Then the real-time pitch rate value is: PR = PR max - ΔPR;

[0023] Where, ΔPR = f2(Accx,Accy);

[0024] (2.3) The pitch angle continues to increase, and the pitch angle is observed in real time. When the pitch angle PA>PAset2, PR=PR0, where PR0 is the original pitch rate;

[0025] (2.4) The pitch angle continues to increase. When the pitch angle PA>PAset3, the wind turbine reaches the maximum pitch position, the pitch rate is 0, and the pitch stops.

[0026] Furthermore, the value range of the pitch angle PA is 0-90°, PAset1 is less than 10°, PAset2 is greater than 80°, and PAset3 is 90°.

[0027] The present invention also discloses a dynamic shutdown control system for a wind turbine generator, comprising:

[0028] The acquisition module is used to monitor the collected unit operation status and cabin vibration data in real time;

[0029] A filtering module is used to filter the collected cabin vibration data to obtain a filtered measurement value;

[0030] The first judgment module is used to judge whether the unit is in a shutdown state according to the unit operation state. If it is not in a shutdown state, the collected unit operation state and cabin vibration data are continuously monitored; if it is in a shutdown state, the second judgment module is started;

[0031] The second judgment module is used to judge whether it is an off-line fault, which is divided into two cases:

[0032] Case 1: If it is not a grid-off fault, the additional value of the pitch rate is increased during the shutdown process, and it is adjusted according to the filtered measurement until the wind turbine reaches the maximum pitch position and the pitch is stopped;

[0033] Case 2: If it is a grid-off fault, the pitch rate is first set to the upper limit pitch rate, and then the pitch rate additional value is increased until the wind turbine reaches the maximum pitch position and the pitch is stopped.

[0034] The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the dynamic shutdown control method of the wind turbine are implemented.

[0035] The present invention also discloses 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 steps of the dynamic shutdown control method of the wind turbine are implemented.

[0036] Compared with the prior art, the present invention has the following beneficial technical effects:

[0037] The present invention discloses a dynamic shutdown control method for a wind turbine. According to the generator energy output during the shutdown process and the vibration during the shutdown process, the blade system pitch rate is dynamically adjusted to achieve the purpose of reducing vibration, reducing the load impact and safety risks of the unit. After determining the shutdown level, it is determined whether it is a grid-off fault. If it is not a grid-off fault, a pitch rate additional value is added during the shutdown process, which is adjusted with the measured amount after filtering; if it is a grid-off fault, the pitch rate is first set with the upper limit pitch rate, and a pitch rate additional value is added, which is dynamically adjusted with the measured amount after filtering. Based on the perspective of energy balance, the present invention is classified according to different faults, and two control algorithms are implemented. One is based on the load rejection situation, that is, the unit has no torque and energy output at all; the other is based on the normal shutdown mode, and the unit can have normal torque and energy output.

[0038] Furthermore, for non-grid-off faults, power generation can still be achieved during the shutdown process. There is no need to rush to retract the propellers, because retracting the propellers too quickly can easily cause vibration shock. First, change the propellers at a relatively small rate, and then gradually adjust according to the vibration conditions. If the vibration is large, the rate can be reduced, and if the vibration is small, the rate can be increased.

[0039] Furthermore, in the case of a power outage, energy cannot be output and energy accumulates in the wind turbine body, which can easily cause the impeller to rotate too fast and vibrate too much. Therefore, the initial pitch rate PR is determined according to the maximum pitch rate upper limit. A larger pitch retraction rate is required to quickly unload the wind energy, and then the pitch rate is slowly reduced to make a smooth transition. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a flow chart of a dynamic shutdown control method for a wind turbine generator. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0042] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0043] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0044] The present invention is based on the operating mechanism of the high-flexible tower unit and the analysis of the big data of wind turbine operation. It is found that vibration is mostly related to sudden load shedding and pitch change. Therefore, maintaining energy balance is the basis for controlling vibration within a reasonable range. Therefore, a set of adaptive pitch adjustment based on energy output and vibration conditions during unit shutdown is proposed to reduce load impact during shutdown and reduce the operation risk of the unit.

[0045] like Figure 1 As shown, the present invention discloses a dynamic shutdown control method for a high-flexible tower of a wind turbine generator, comprising the following steps:

[0046] S1. Real-time monitoring of the unit operation status and cabin vibration data collected by PLC. Filtering of the cabin vibration data in the x-direction and y-direction collected by PLC is performed to remove the clutter and impact value caused by sensing, and obtain continuous filtered measurement quantities Accx and Accy; Accx is the acceleration of the unit in the x-direction, and Accy is the acceleration in the y-direction;

[0047] S2, check the running status of the unit to determine whether it is in the shutdown state. If it is not in the shutdown state, return to S1; if it is in the shutdown state, execute S3;

[0048] S3. Determine the shutdown level, whether it is an off-line fault. The shutdown level is a number, for example, 1 represents an off-line fault, and 2 represents a non-off-line fault. There are two specific situations:

[0049] Case 1: If it is not a grid-off fault, add an additional value for the pitch rate, which is adjusted according to the filtered measurement;

[0050] Case 2: If it is a grid-off fault, the pitch rate is first set to the upper limit pitch rate, and an additional pitch rate value is added. This value is dynamically adjusted according to the measured value after filtering.

[0051] Situation 1 is as follows: Check the shutdown level. When a non-offline fault occurs, do the following:

[0052] (1.1) On the basis of the original pitch strategy, a positive pitch rate additional value ΔPR is added; that is, the pitch rate value in real time is: PR = PR0 + ΔPR; at this time, the initial position PA is around 0°;

[0053] Among them, ΔPR = f1 (Accx, Accy); PR0 is the initial pitch rate, which generally does not change and is a fixed value; this function is to dynamically adjust ΔPR based on the change of acceleration, and accumulate in the direction of increasing the pitch angle during the shutdown process;

[0054] (1.2) The pitch angle PA continues to increase, the current pitch angle is observed in real time, and the size of the current pitch angle and PAset2 is determined. When the pitch angle PA is less than PAset2, the method of step (1.1) is continuously executed to continue increasing the pitch angle;

[0055] When the pitch angle PAset2≤PA≤PAset3, ΔPR=PR0;

[0056] (1.3) The pitch angle continues to increase. When the pitch angle PA>PAset3, the wind turbine reaches the maximum pitch position, the pitch rate is 0, and the pitch stops.

[0057] Situation 2 is as follows: Check the shutdown level. When a network failure occurs, do the following:

[0058] (2.1) Check whether the pitch angle is less than the set value PA set1. If it is less than the set value PA set1, the pitch rate is determined according to the maximum pitch rate upper limit, that is, PR = PRmax;

[0059] (2.2) The pitch angle continues to increase. When the pitch angle is greater than the set value PA set1, a negative pitch rate value ΔPR is added to the pitch rate PRmax set value; that is, the pitch rate value is in real time: PR = PR max - ΔPR;

[0060] Where, ΔPR = f2(Accx,Accy);

[0061] (2.3) The pitch angle continues to increase, and the pitch angle is observed in real time. When the pitch angle PA>PAset2, PR=PR0, where PR0 is the original pitch rate;

[0062] (2.4) The pitch angle continues to increase. When the pitch angle PA>PAset3, the wind turbine reaches the maximum pitch position, the pitch rate PR is 0, and the pitch stops.

[0063] The pitch angle is usually in the range of 0-90°, which refers to a rotation angle. When it reaches 90°, it means that the pitch is in place. When the pitch stops, the pitch rate is 0.

[0064] PAset1, PAset2, and PAset3 are three pitch angle setting values. Usually, PAset1 is a value less than 10°, PAset2 is a value greater than 80°, and PAset3 is 90°.

[0065] The PR mentioned above represents the pitch rate, and PA represents the pitch angle. If there is no pitch rate, the pitch angle remains unchanged. If the pitch rate is greater than 0, the pitch angle continues to increase. If the pitch rate is less than 0, the pitch angle continues to decrease. The pitch angle is usually between 0-90°, and the pitch rate is usually between -5° / s and +5° / s. The shutdown process usually refers to the process of changing the pitch angle from 0° to 90°, and dynamically adjusting the pitch rate to reduce vibration impact.

[0066] Normally, the pitch rate during the shutdown process is a constant value. For high and flexible towers, if the wind conditions are different and the shutdown levels are different, sudden changes in torque output and pitch rate are likely to cause continuous vibration. The present invention dynamically adjusts the pitch rate according to the generator torque output during the shutdown process and the vibration conditions during the shutdown process, so as to reduce vibration, reduce unit load impact and safety risks.

[0067] The present invention also discloses a dynamic shutdown control system for a wind turbine generator, comprising:

[0068] The acquisition module is used to monitor the collected unit operation status and cabin vibration data in real time;

[0069] A filtering module is used to filter the collected cabin vibration data to obtain a filtered measurement value;

[0070] The first judgment module is used to judge whether the unit is in a shutdown state according to the unit operation state. If it is not in a shutdown state, the collected unit operation state and cabin vibration data are continuously monitored; if it is in a shutdown state, the second judgment module is started;

[0071] The second judgment module is used to judge whether it is an off-line fault, which is divided into two cases:

[0072] Case 1: If it is not a grid-off fault, the additional value of the pitch rate is increased during the shutdown process, and it is adjusted according to the filtered measurement until the wind turbine reaches the maximum pitch position and the pitch is stopped;

[0073] Case 2: If it is a grid-off fault, the pitch rate is first set to the upper limit pitch rate, and then the pitch rate additional value is increased until the wind turbine reaches the maximum pitch position and the pitch stops.

[0074] The dynamic shutdown control method of the wind turbine of the present invention can be implemented in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention can be implemented in 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.

[0075] If the dynamic shutdown control method of the wind turbine of the present invention is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased 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 electric carrier signals and telecommunication signals. Among them, the computer storage medium can be any available medium or data storage device that can be accessed by the computer, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid-state drive (SSD)), etc.

[0076] In an exemplary embodiment, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the dynamic shutdown control method of the wind turbine when executing the computer program. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A dynamic shutdown control method for a wind turbine, characterized in that: The following steps are involved: S1. Real-time monitoring of the collected unit operation status and cabin vibration data, filtering the collected cabin vibration data to obtain filtered measurement quantities; S2, check the running status of the unit to determine whether it is in the shutdown state. If it is not in the shutdown state, return to S1; if it is in the shutdown state, execute S3; S3. Determine the shutdown level and judge whether it is an off-grid fault. There are two situations: Case 1: If it is not a grid-off fault, the additional value of the pitch rate is increased, which is adjusted according to the filtered measurement value until the wind turbine reaches the maximum pitch position and the pitch is stopped; Case 2: If it is a grid-off fault, the pitch rate is first set to the upper pitch rate limit, and then the pitch rate additional value is increased until the wind turbine reaches the maximum pitch position, and the pitch is stopped; In S1, the collected cabin vibration data in the x direction and the cabin vibration data in the y direction are filtered to obtain filtered measurement quantities, which are recorded as Accx and Accy respectively; Situation 1 specifically includes the following steps: (1.1) On the basis of the original pitch rate, a positive pitch rate additional value ΔPR is added; then the real-time pitch rate value is: PR=PR0+ΔPR; Wherein, ΔPR=f1(Accx,Accy), PR0 is the original pitch rate, PR0 remains unchanged, and ΔPR is dynamically adjusted; Accx is the filtered measurement obtained by filtering the collected x-direction cabin vibration data, and Accy is the filtered measurement obtained by filtering the collected y-direction cabin vibration data; (1.2) The pitch angle continues to increase, and the current pitch angle is observed in real time. When the pitch angle PA < PAset2, the method of step (1.1) is continued; When the pitch angle PAset2≤PA≤PAset3, ΔPR=PR0; (1.3) The pitch angle continues to increase. When the pitch angle PA>PAset3, the wind turbine reaches the maximum pitch position, the pitch rate is 0, and the pitch stops.

2. A dynamic shutdown control method for a wind turbine according to claim 1, characterized in that: Case 2 specifically includes the following steps: (2.1) Check whether the pitch angle PA is less than the set value PA set1. If it is less than the set value PA set1, the pitch rate PR is determined according to the maximum pitch rate upper limit, and PR=PRmax; (2.2) The pitch angle PA continues to increase. When the pitch angle PA is greater than the set value PA set1, a negative pitch rate value ΔPR is added to the pitch rate PAmax set value. Then the real-time pitch rate value is: PR=PR max-ΔPR; Where, ΔPR=f2(Accx,Accy); (2.3) The pitch angle continues to increase, and the pitch angle is observed in real time. When the pitch angle PA>PAset2, PR=PR0, where PR0 is the original pitch rate; (2.4) The pitch angle continues to increase. When the pitch angle PA>PAset3, the wind turbine reaches the maximum pitch position, the pitch rate is 0, and the pitch stops.

3. A dynamic shutdown control method for a wind turbine according to claim 1, characterized in that: The value range of the pitch angle PA is 0-90°, PAset1 is less than 10°, PAset2 is greater than 80°, and PAset3 is 90°.

4. A dynamic shutdown control system for a wind turbine generator that implements the dynamic shutdown control method for a wind turbine generator as described in any one of claims 1 to 3, characterized in that: include: The acquisition module is used to monitor the collected unit operation status and cabin vibration data in real time; A filtering module is used to filter the collected cabin vibration data to obtain a filtered measurement value; The first judgment module is used to judge whether the unit is in a shutdown state according to the unit operation state. If it is not in a shutdown state, the collected unit operation state and cabin vibration data are continuously monitored; if it is in a shutdown state, the second judgment module is started; The second judgment module is used to judge whether it is an off-line fault, which is divided into two cases: Case 1: If it is not a grid-off fault, the additional value of the pitch rate is increased during the shutdown process, and it is adjusted according to the filtered measurement until the wind turbine reaches the maximum pitch position and the pitch is stopped; Case 2: If it is a grid-off fault, the pitch rate is first set to the upper limit pitch rate, and then the pitch rate additional value is increased until the wind turbine reaches the maximum pitch position and the pitch stops.

5. 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, the steps of the dynamic shutdown control method for a wind turbine as claimed in any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the dynamic shutdown control method for a wind turbine as claimed in any one of claims 1 to 3 are implemented.

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