Wind wheel unbalance detection and correction method, system and equipment based on blade dynamic information

Abstract

The invention discloses a wind wheel unbalance detection and correction method, system and device based on blade dynamic information. The method comprises the steps that the blade tip acceleration and displacement amplitude under the same wind speed and the same azimuth angle are compared to obtain corresponding deviations; judging the magnitude of any one or both of the acceleration deviation and the displacement amplitude deviation and a corresponding preset acceleration deviation threshold value and a preset displacement amplitude deviation threshold value; if any one or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than a preset acceleration deviation threshold value and a preset displacement amplitude deviation threshold value, determining that the wind wheel of the wind turbine generator is unbalanced; for the unbalanced wind turbine generator wind wheel, counting the times that any one or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than a preset acceleration deviation threshold value and a preset displacement amplitude deviation threshold value; and if the counted number of times is greater than or equal to the preset limit value, performing variable pitch angle adjustment on the unbalanced wind wheel of the wind turbine generator according to the acceleration deviation and the displacement amplitude deviation until the wind wheel of the wind turbine generator is balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator sets, and in particular to a method, system and device for detecting and correcting wind wheel imbalance based on blade dynamic information. Background Art

[0002] The design, manufacturing, transportation, installation and other reasons of wind turbine blades may cause the three blades to have different aerodynamic characteristics, thus causing aerodynamic imbalance of the wind rotor, causing abnormal vibration of the wind turbine, accelerated wear and reduced operating stability of the unit.

[0003] Currently, different manufacturers mostly determine the aerodynamic imbalance of wind turbine rotors through video imaging or vibration monitoring, but this detection and determination method requires the addition of additional equipment and requires huge investment, which is not economical for manufacturers. In addition, when aerodynamic imbalance of wind turbine rotors is found, maintenance personnel are required to climb the tower to manually compensate for the blade pitch angle, but this adjustment method has a certain lag and will cause certain fatigue damage to the wind turbine. Summary of the invention

[0004] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a method, system and equipment for detecting and correcting wind rotor imbalance based on blade dynamic information, which can reduce the vibration and fatigue damage of wind turbines, eliminates the need for maintenance personnel to manually compensate for aerodynamically unbalanced blades, and has good synchronization.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides a method for detecting and correcting a wind rotor imbalance based on blade dynamic information, comprising:

[0007] Compare the blade tip acceleration and displacement amplitude at the same wind speed and azimuth to obtain the acceleration deviation and displacement amplitude deviation;

[0008] Determine the magnitude of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and preset displacement amplitude deviation threshold;

[0009] If either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced;

[0010] For an unbalanced wind turbine rotor, counting the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold;

[0011] If the counted number of times is greater than or equal to a preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine is balanced. When adjusting the pitch angle, different pitch angle adjustment settings are made according to the wind speed.

[0012] Furthermore, in the above-mentioned method for detecting and correcting wind rotor imbalance based on blade dynamic information, the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold include: ±5% of the acceleration deviation and the displacement amplitude deviation.

[0013] Furthermore, in the above-mentioned wind rotor imbalance detection and correction method based on blade dynamic information, the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold include: ±2%-±10% of the acceleration deviation and the displacement amplitude deviation.

[0014] Furthermore, in the above-mentioned method for detecting and correcting wind rotor imbalance based on blade dynamic information, the preset limit value includes any number of 5, 10, 15, 20, 25, and 30.

[0015] Furthermore, in the above-mentioned method for detecting and correcting wind rotor imbalance based on blade dynamic information, the preset limit value includes any number from 5 to 50.

[0016] Further, in the above-mentioned method for detecting and correcting wind rotor imbalance based on blade dynamic information, if the statistical number is greater than or equal to a preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine reaches balance, which includes:

[0017] Comparing and sorting the acceleration deviation and the displacement amplitude deviation of the wind turbine blades in the wind turbine generator set;

[0018] If the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are smaller than those of the remaining blades, the remaining blades are adjusted with a pitch angle, and the blade is kept running in its original state; or if the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are larger than those of the remaining blades, the blade is adjusted with a pitch angle, and the remaining blades are kept running in their original state;

[0019] If the acceleration deviation and displacement amplitude deviation of all blades in the wind turbine rotor are greatly different from each other, the two blades with the largest acceleration deviation and displacement amplitude deviation are adjusted by increasing the pitch angle, and the remaining blades are kept in the original state.

[0020] The relatively large deviation includes that the difference between all blade acceleration deviations or displacement deviations is greater than or equal to 5%.

[0021] Furthermore, in the above-mentioned method for detecting and correcting wind rotor imbalance based on blade dynamic information, when adjusting the pitch angle, adjusting different pitch angles according to the wind speed includes:

[0022] For blades with a wind speed less than or equal to the rated wind speed, the pitch angle is adjusted by the first single pitch angle adjustment amount;

[0023] For blades with wind speed greater than the rated wind speed, the pitch angle is adjusted by the second single pitch angle adjustment amount.

[0024] Furthermore, in the above-mentioned method for detecting and correcting wind rotor imbalance based on blade dynamic information, the first single pitch angle adjustment amount is smaller than the second single pitch angle adjustment amount.

[0025] In a second aspect, the present invention discloses a wind wheel imbalance detection and correction system based on blade dynamic information, comprising:

[0026] A comparison module, wherein the comparison module is used to compare the blade tip acceleration and displacement amplitude at the same wind speed and the same azimuth angle to obtain an acceleration deviation and a displacement amplitude deviation;

[0027] A judgment module, the judgment module is used to judge the magnitude of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and preset displacement amplitude deviation threshold; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced;

[0028] A statistical module, the statistical module is used to count the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold for the unbalanced wind turbine rotor;

[0029] The correction module is used for correction. If the number of times counted is greater than or equal to a preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine is balanced. When adjusting the pitch angle, different pitch angle adjustment settings are made according to the wind speed.

[0030] In a third aspect, the present invention further provides a wind rotor imbalance detection and correction device based on blade dynamic information, comprising:

[0031] A first detection unit, wherein the first detection unit is arranged inside a blade tip of a wind turbine blade, and the first detection unit comprises an acceleration sensor or an acceleration detection device, and is used to detect acceleration in a swing direction of a blade tip of the wind turbine blade;

[0032] A second detection unit, wherein the second detection unit is arranged inside a blade tip of the wind turbine blade, and the second detection unit comprises a displacement sensor or a displacement monitoring device, and is used to detect the displacement of the blade tip of the wind turbine blade in a flapping direction;

[0033] A control device, the control device is used to receive the acceleration data of the blade tip swing direction detected by the first detection unit and the displacement data of the blade tip waving direction detected by the second detection unit, and the control device pre-stores a preset acceleration deviation threshold value, a displacement amplitude deviation threshold value, and a preset limit value of the number of preset acceleration deviation threshold values ​​and preset displacement amplitude deviation threshold values ​​that are externally input or called externally; and compares the blade tip acceleration and displacement amplitude values ​​at the same wind speed and the same azimuth according to the detected data to obtain the acceleration deviation and the displacement amplitude deviation; and determines whether any one or both of the acceleration deviation and the displacement amplitude deviation are consistent with the corresponding preset acceleration deviation threshold value and the preset displacement amplitude deviation threshold value. value; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced; for the unbalanced wind turbine rotor, the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold is counted; if the counted number is greater than or equal to the preset limit, the pitch angle of the unbalanced wind turbine rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind turbine rotor is balanced, wherein, when adjusting the pitch angle, different pitch angle adjustment settings are performed according to the wind speed.

[0034] The main advantages of the technical solution of the present invention are as follows:

[0035] The method for detecting and correcting wind rotor imbalance based on blade dynamic information of the present invention obtains blades with larger tip acceleration and displacement deviations at the same wind speed and azimuth by comparing blade tip acceleration and displacement amplitudes at the same wind speed and azimuth, and automatically performs pitch angle compensation, so that the wind turbine automatically eliminates the problem of wind rotor imbalance; at the same time, when aerodynamic imbalance exists in the blades of the wind turbine, it is determined whether there is wind rotor imbalance by statistically analyzing the acceleration and displacement time series, so as to perform variable pitch adjustment in real time, thereby ensuring the normal operation of the wind turbine and solving the problem of wind rotor imbalance, and reducing vibration and fatigue damage of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 A schematic flow chart of a method for detecting and correcting wind rotor imbalance based on blade dynamic information according to an embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of a wind rotor imbalance detection and correction system based on blade dynamic information provided by one embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 10. Comparison module; 20. Judgment module; 30. Statistics module; 40. Correction module. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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 making creative work are within the scope of protection of the present invention.

[0042] The following is combined with Figure 1-2 , describes in detail the technical solution provided by the embodiments of the present invention.

[0043] like Figure 1 As shown, the present invention provides a method for detecting and correcting wind wheel imbalance based on blade dynamic information, the method comprising the following steps S1 to S4:

[0044] Step S1: comparing the blade tip acceleration and displacement amplitude at the same wind speed and azimuth to obtain the acceleration deviation and displacement amplitude deviation;

[0045] It should be noted that the blade dynamic information in the present invention includes the above-mentioned blade tip acceleration and displacement amplitude.

[0046] Step S2: Determine the magnitude of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and preset displacement amplitude deviation threshold; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced;

[0047] Step S3: for the unbalanced wind turbine rotor, counting the number of times that one or both of the acceleration deviation and the displacement amplitude deviation are greater than a preset acceleration deviation threshold and a preset displacement amplitude deviation threshold;

[0048] In some optional implementations of this embodiment, the above-mentioned preset acceleration deviation threshold and preset displacement amplitude deviation threshold include: ±5% of the acceleration deviation and the displacement amplitude deviation.

[0049] In another optional implementation of this embodiment, the above-mentioned preset acceleration deviation threshold and preset displacement amplitude deviation threshold include: ±2%-±10% of the acceleration deviation and the displacement amplitude deviation.

[0050] Step S4: If the statistical number is greater than or equal to the preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine is balanced. When adjusting the pitch angle, different pitch angles are adjusted and set according to the wind speed.

[0051] The above preset limit includes any number of 5, 10, 15, 20, 25, and 30.

[0052] In some optional implementations of this embodiment, the above-mentioned preset limit value includes any number between 5-50.

[0053] Specifically, if the number of statistics is greater than or equal to a preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine generator set is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine generator set reaches balance, including:

[0054] Compare and sort the acceleration deviation and displacement amplitude deviation of wind turbine blades in wind turbines;

[0055] If the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are smaller than those of the remaining blades, the remaining blades are adjusted with a variable pitch angle, and one blade is kept running in its original state; or if the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are larger than those of the remaining blades, the pitch angle of one blade is adjusted with a variable pitch angle, and the remaining blades are kept running in their original state;

[0056] If the acceleration deviation and displacement amplitude deviation of all blades in the wind turbine rotor are greatly different from each other, the two blades with the largest acceleration deviation and displacement amplitude deviation are adjusted by increasing the pitch angle, and the remaining blades are kept in the original state.

[0057] The above-mentioned relatively large deviation includes that the difference between all blade acceleration deviations or displacement deviations is greater than or equal to 5%.

[0058] It should be noted that, no matter whether it is the acceleration or the displacement, as long as one variable has a large deviation, it is possible that the wind rotor is unbalanced. Therefore, as long as the wind rotor is unbalanced, it can be adjusted.

[0059] Specifically, when adjusting the pitch angle, different pitch angle adjustment settings according to wind speed include:

[0060] For blades with a wind speed less than or equal to the rated wind speed, the pitch angle is adjusted by the first single pitch angle adjustment amount;

[0061] For blades with wind speed greater than the rated wind speed, the pitch angle is adjusted by the second single pitch angle adjustment amount.

[0062] In order to make the adjustment result more accurate during the adjustment of the wind turbine generator set, the first single pitch angle adjustment amount is set to be smaller than the second single pitch angle adjustment amount.

[0063] Therefore, a method for detecting and correcting wind rotor imbalance based on blade dynamic information of the present invention performs statistical analysis on the tip acceleration and displacement time series of three blades, the wind rotor azimuth angle time series, and the wind speed time series, and obtains blades with larger tip acceleration and displacement deviations at the same wind speed and azimuth angle, and automatically performs pitch angle compensation, so that the wind turbine set automatically eliminates the wind rotor imbalance problem and ensures the normal operation of the wind turbine set.

[0064] Specifically, the process and working principle of the present invention are further described in detail below in combination with the actual application process, specifically:

[0065] Acceleration and displacement sensors are installed inside the tips of the three blades to monitor the dynamic information of the three blades when the wind rotor rotates, including the acceleration in the swing direction of the blade tip and the displacement in the flapping direction of the blade tip.

[0066] The tip acceleration and displacement time series of the three blades, the rotor azimuth time series, and the wind speed time series were obtained, and statistical analysis was performed on the time series.

[0067] Compare the acceleration and displacement amplitudes of the blade tips of the three blades at the same wind speed (the wind speeds can be slightly different) and the same azimuth (acceleration and displacement can be used as comparison objects respectively):

[0068] If the deviation of acceleration and displacement amplitude between the three blades is less than 5%, it means that the wind wheel is balanced and can continue to operate in the original state;

[0069] If the deviation of the acceleration and displacement amplitudes between the three blades is greater than or equal to 5%, it means that the wind wheel is unbalanced, and the number of times the deviation of the acceleration and displacement amplitude is greater than or equal to 5% is counted.

[0070] When the cumulative number reaches a certain limit, the blades are pitch adjusted according to the acceleration and displacement amplitude deviation.

[0071] In the adjustment process, there are two situations according to the actual application:

[0072] The first case: the acceleration and displacement amplitude of one blade has a large deviation, while the acceleration and displacement amplitudes of the other two blades are close; if the acceleration and displacement amplitude of one blade is less than that of the other two blades, the pitch angle adjustment of the other two blades is increased, and one blade is kept running in the original state; if the acceleration and displacement amplitude of one blade is greater than that of the other two blades, the pitch angle adjustment of one blade is increased, and the other two blades are kept running in the original state;

[0073] The first case: the acceleration and displacement amplitudes of the three blades deviate greatly from each other, then the pitch angle adjustment is increased for the two blades with larger acceleration and displacement amplitudes, and the one blade with smaller acceleration and displacement amplitude maintains its original state.

[0074] When adjusting the blade pitch angle, different pitch angles are adjusted according to the wind speed:

[0075] When the wind speed is ≤ the rated wind speed, the pitch angle is adjusted according to the single pitch angle adjustment amount β1, and the tip acceleration and displacement deviation of the three blades are observed at the same time until the tip acceleration and displacement deviation of the three blades are less than 5%.

[0076] When the wind speed is greater than the rated wind speed, the pitch angle is adjusted according to the single pitch angle adjustment amount β2, and the tip acceleration and displacement deviation of the three blades are observed at the same time until the tip acceleration and displacement deviation of the three blades are less than 5%.

[0077] The single pitch angle adjustment amount β1 is smaller than β2.

[0078] Specifically, the pitch angle adjustment range of a wind turbine is usually between 0° and +90°. At low wind speeds, the pitch angle is close to 0° to capture the maximum amount of wind energy; at high wind speeds, the pitch angle will increase to prevent overload and damage. The above-mentioned single pitch angle adjustment amounts β1 and β2 are adjusted according to actual needs, and the adjustment range is between 0° and +90°. For example, a single adjustment is performed at intervals of 0.2°, 0.5°, or any angle range of 0.1° to 5°. Repeat the above-mentioned single adjustments of the same or different angles multiple times until the current deviation of the three-blade pitch motor is less than 5% and stop.

[0079] It should be noted that when the wind turbine is in normal power generation (non-fault condition), if the wind speed is ≤ the rated wind speed, the pitch control will not work (usually it is tracking the optimal Cp or torque control at this time). If the pitch adjustment is required due to the imbalance of the wind rotor, a small adjustment will be made at this time. A slightly larger single adjustment will cause a larger power fluctuation, thus affecting the power generation of the unit. If the wind speed is greater than the rated wind speed, the pitch control has already taken effect. Generally speaking, the three blades already have a certain pitch angle. If the pitch adjustment is required due to the imbalance of the wind rotor, the adjustment range can be larger, and a slightly larger single adjustment will not cause too much fluctuation.

[0080] Therefore, the method of the present invention can determine whether the wind rotor has an imbalance problem based on the deviation of the acceleration in the swing direction and the displacement amplitude in the flapping direction of the blade tips of the three blades. When the wind rotor is unbalanced, the pitch adjustment can be automatically performed. When the wind rotor is unbalanced, the pitch adjustment can be automatically performed, thereby solving the aerodynamic imbalance problem caused by the acceleration and displacement of the blade tips, thereby reducing the vibration and fatigue damage of the wind turbine.

[0081] Second, as Figure 2 As shown, the present invention provides a wind wheel imbalance detection and correction system based on blade dynamic information, the system comprising: a comparison module 10, a judgment module 20, a statistics module 30 and a correction module 40, wherein:

[0082] The comparison module 10 is used to compare the acceleration and displacement amplitude of the blade tip at the same wind speed and the same azimuth angle to obtain the acceleration deviation and the displacement amplitude deviation; the judgment module 20 is used to judge the size of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and the preset displacement amplitude deviation threshold; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced; the statistical module 30 is used to count the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold for the unbalanced wind turbine rotor; the correction module 40 is used to perform correction, and if the statistical number of times is greater than or equal to the preset limit, the pitch angle of the unbalanced wind turbine rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind turbine rotor reaches balance, wherein, when the pitch angle is adjusted, different pitch angles are adjusted and set according to the wind speed.

[0083] In a third aspect, the present invention further provides a wind wheel imbalance detection and correction device based on blade dynamic information, which can solve the problem of aerodynamic imbalance caused by acceleration and displacement of the blade tip, comprising: a first detection unit, a second detection unit and a control device, wherein:

[0084] The first detection unit is arranged inside the tip of the wind turbine blade, and the first detection unit includes an acceleration sensor or an acceleration detection device, which is used to detect the acceleration of the tip of the wind turbine blade in the swing direction; the second detection unit is arranged inside the tip of the wind turbine blade, and the second detection unit includes a displacement sensor or a displacement monitoring device, which is used to detect the displacement of the tip of the wind turbine blade in the swing direction; the control device is used to receive the acceleration data of the blade tip in the swing direction detected by the first detection unit and the displacement data of the blade tip in the swing direction detected by the second detection unit, and the control device pre-stores the preset acceleration deviation threshold, displacement amplitude deviation threshold and preset limit values ​​of the number of preset acceleration deviation threshold and preset displacement amplitude deviation threshold that are externally input or called externally; and compares the blade tip acceleration at the same wind speed and the same azimuth according to the detected data. and displacement amplitude to obtain acceleration deviation and displacement amplitude deviation; determine the magnitude of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and preset displacement amplitude deviation threshold; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced; for the unbalanced wind turbine rotor, count the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold; if the counted number of times is greater than or equal to the preset limit, adjust the pitch angle of the unbalanced wind turbine rotor according to the acceleration deviation and the displacement amplitude deviation until the wind turbine rotor is balanced, wherein, when adjusting the pitch angle, different pitch angle adjustments are set according to the wind speed.

[0085] Among them, when the wind turbine aerodynamic imbalance correction is specifically performed, the following operations are performed in the above-mentioned control device, and the following operations are performed inside the control device during the execution of the following operations, and the control device only outputs the execution results. Specifically: if the number of statistics is greater than or equal to the preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine reaches balance, including:

[0086] The acceleration deviations and displacement amplitude deviations of the wind turbine blades in the wind turbine are compared and ranked; if the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are smaller than those of the remaining blades, the remaining blades are increased by pitch angle adjustment, and one blade is kept running in the original state; or if the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are larger than those of the remaining blades, the one blade is increased by pitch angle adjustment, and the remaining blades are kept running in the original state; if there are large deviations between the acceleration deviations and displacement amplitude deviations of all blades in the wind turbine rotor, the two blades with the largest ranking of acceleration deviation and displacement amplitude deviation are increased by pitch angle adjustment, and the remaining blades are kept running in the original state; wherein the large deviation includes that the difference between the acceleration deviations or displacement deviations of all blades is greater than or equal to 5%.

[0087] When adjusting the pitch angle, different pitch angle adjustment settings are made according to the wind speed, including: for blades with a wind speed less than or equal to the rated wind speed, the pitch angle is adjusted by a first single pitch angle adjustment amount; for blades with a wind speed greater than the rated wind speed, the pitch angle is adjusted by a second single pitch angle adjustment amount. And the first single pitch angle adjustment amount is less than the second single pitch angle adjustment amount.

[0088] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0089] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by adding a necessary general hardware platform, and of course can also be implemented by combining hardware and software. Based on such an understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a computer product, and the present invention can be 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.

[0090] It should be understood that each module / unit of the device of the present invention can be implemented in whole or in part by software, hardware, firmware or a combination thereof. Each module / unit can be embedded in the processor of the electronic device or independent of the processor in the form of hardware or firmware, or can be stored in the memory of the electronic device in the form of software for the processor to call to perform the operation of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0091] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0092] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting and correcting wind rotor imbalance based on blade dynamic information, characterized in that: include: Compare the blade tip acceleration and displacement amplitude at the same wind speed and azimuth to obtain the acceleration deviation and displacement amplitude deviation; Determine the magnitude of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and preset displacement amplitude deviation threshold; If either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced; For an unbalanced wind turbine rotor, counting the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold; If the counted number of times is greater than or equal to a preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine is balanced. When adjusting the pitch angle, different pitch angle adjustment settings are made according to the wind speed.

2. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 1, characterized in that: The preset acceleration deviation threshold and the preset displacement amplitude deviation threshold include: ±5% of the acceleration deviation and the displacement amplitude deviation.

3. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 1, characterized in that: The preset acceleration deviation threshold and the preset displacement amplitude deviation threshold include: ±2%-±10% of the acceleration deviation and the displacement amplitude deviation.

4. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 1, characterized in that: The preset limit value includes any number of 5, 10, 15, 20, 25, and 30.

5. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 1, characterized in that: The preset limit value includes any number between 5-50.

6. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 1, characterized in that: If the counted number of times is greater than or equal to a preset limit, adjusting the pitch angle of the unbalanced wind rotor of the wind turbine generator set according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine generator set reaches balance includes: Comparing and sorting the acceleration deviation and the displacement amplitude deviation of the wind turbine blades in the wind turbine generator set; If the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are smaller than those of the remaining blades, the remaining blades are adjusted with a pitch angle, and the blade is kept running in its original state; or if the acceleration deviation and displacement amplitude deviation of any blade in the wind turbine rotor are larger than those of the remaining blades, the blade is adjusted with a pitch angle, and the remaining blades are kept running in their original state; If the acceleration deviation and displacement amplitude deviation of all blades in the wind turbine rotor are greatly different from each other, the two blades with the largest acceleration deviation and displacement amplitude deviation are adjusted by increasing the pitch angle, and the remaining blades are kept in the original state. The relatively large deviation includes that the difference between all blade acceleration deviations or displacement deviations is greater than or equal to 5%.

7. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 1, characterized in that: When adjusting the pitch angle, different pitch angle adjustment settings are made according to the wind speed, including: For blades with a wind speed less than or equal to the rated wind speed, the pitch angle is adjusted by the first single pitch angle adjustment amount; For blades with wind speed greater than the rated wind speed, the pitch angle is adjusted by the second single pitch angle adjustment amount.

8. The method for detecting and correcting wind rotor imbalance based on blade dynamic information according to claim 7, characterized in that: The first single pitch angle adjustment amount is smaller than the second single pitch angle adjustment amount.

9. A wind rotor imbalance detection and correction system based on blade dynamic information, characterized in that: include: A comparison module, wherein the comparison module is used to compare the blade tip acceleration and displacement amplitude at the same wind speed and the same azimuth angle to obtain an acceleration deviation and a displacement amplitude deviation; A judgment module, the judgment module is used to judge the magnitude of either or both of the acceleration deviation and the displacement amplitude deviation and the corresponding preset acceleration deviation threshold and preset displacement amplitude deviation threshold; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced; A statistical module, the statistical module is used to count the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold for the unbalanced wind turbine rotor; The correction module is used for correction. If the number of times counted is greater than or equal to a preset limit, the pitch angle of the unbalanced wind rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind rotor of the wind turbine is balanced. When adjusting the pitch angle, different pitch angle adjustment settings are made according to the wind speed.

10. A wind wheel imbalance detection and correction device based on blade dynamic information, characterized in that: include: A first detection unit, wherein the first detection unit is arranged inside a blade tip of a wind turbine blade, and the first detection unit comprises an acceleration sensor or an acceleration detection device, and is used to detect acceleration in a swing direction of a blade tip of the wind turbine blade; A second detection unit, wherein the second detection unit is arranged inside a blade tip of the wind turbine blade, and the second detection unit comprises a displacement sensor or a displacement monitoring device, and is used to detect the displacement of the blade tip of the wind turbine blade in a flapping direction; A control device, the control device is used to receive the acceleration data of the blade tip swing direction detected by the first detection unit and the displacement data of the blade tip waving direction detected by the second detection unit, and the control device pre-stores a preset acceleration deviation threshold value, a displacement amplitude deviation threshold value, and a preset limit value of the number of preset acceleration deviation threshold values ​​and preset displacement amplitude deviation threshold values ​​that are externally input or called externally; and compares the blade tip acceleration and displacement amplitude values ​​at the same wind speed and the same azimuth according to the detected data to obtain the acceleration deviation and the displacement amplitude deviation; and determines whether any one or both of the acceleration deviation and the displacement amplitude deviation are consistent with the corresponding preset acceleration deviation threshold value and the preset displacement amplitude deviation threshold value. value; if either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold, the wind turbine rotor is unbalanced; for the unbalanced wind turbine rotor, the number of times that either or both of the acceleration deviation and the displacement amplitude deviation are correspondingly greater than the preset acceleration deviation threshold and the preset displacement amplitude deviation threshold is counted; if the counted number is greater than or equal to the preset limit, the pitch angle of the unbalanced wind turbine rotor of the wind turbine is adjusted according to the acceleration deviation and the displacement amplitude deviation until the wind turbine rotor is balanced, wherein, when adjusting the pitch angle, different pitch angle adjustment settings are performed according to the wind speed.

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