CN111677635B - A method and device for testing the bending moment of wind turbine blades taking into account orthogonal effects - Google Patents
A method and device for testing the bending moment of wind turbine blades taking into account orthogonal effects Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
本发明涉及一种计及正交影响的风电机组叶片弯矩测试方法及装置，包括：获取风电机组叶片挥舞弯矩的电压信号和摆振弯矩的电压信号；根据所述风电机组叶片挥舞弯矩的电压信号和摆振弯矩的电压信号确定风电机组叶片的挥舞弯矩和摆振弯矩；本发明基于挥舞弯矩的电压信号和摆振弯矩的电压信号获得挥舞弯矩和摆振弯矩，计及了摆振与挥舞之间的正交敏感影响，使得测试结果更加准确可靠。
The present invention relates to a method and device for testing the bending moment of a wind turbine blade taking into account orthogonal influences, comprising: obtaining a voltage signal of a flapping bending moment and a voltage signal of a shimming bending moment of a wind turbine blade; determining the flapping bending moment and the shimming bending moment of the wind turbine blade according to the voltage signal of the flapping bending moment and the voltage signal of the shimming bending moment of the wind turbine blade; the present invention obtains the flapping bending moment and the shimming bending moment based on the voltage signal of the flapping bending moment and the voltage signal of the shimming bending moment, taking into account the orthogonal sensitive influence between shimming and flapping, so that the test result is more accurate and reliable.
Description
Technical Field
The invention relates to the technical field of product detection control of wind turbines, in particular to a wind turbine blade bending moment testing method and device considering orthogonal influence.
Background
With the development of large-scale wind turbine generators, the blade size of the wind turbine generators is increased obviously, and when the length of the blade is increased, the bending moment born by the root of the blade is increased, so that the damage rate of the blade is increased. Therefore, the strength and the dynamics performance of the blade are ensured to meet the design requirements, so that the long-term and reliable operation of the unit is ensured, the blade bending moment test generally only measures the shimmy and waving bending moment of the root of the blade, and the blade bending moment test is also the most important part of the bending moment designed by the wind turbine, and directly influences the fatigue life of the blade. Blade bending moment testing is an important method for guaranteeing the service life of the blade and is an unavailable part of type tests.
In the bending moment test of the blade, the accuracy of the bending moment test result is directly affected by the reasonable or unreasonable calibration method of the bending moment quantity of the blade and the test voltage (or current) signal. In the test, a voltage signal of the position of the strain gauge is usually collected to complete the bending moment test, but the actual strain position may not be located in the shimmy direction and the waving direction, so that the shimmy bending moment influences the waving bending moment, the waving bending moment influences the shimmy bending moment, namely, the orthogonal sensitivity is generated, and the accuracy of the finally obtained bending moment is lower.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a wind turbine generator blade bending moment testing method and device considering orthogonal influence, the waving bending moment and the shimmy bending moment are obtained based on the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment, and the orthogonal sensitive influence between shimmy and waving is considered, so that the testing result is more accurate and reliable.
The invention aims at adopting the following technical scheme:
the invention provides a wind turbine generator blade bending moment testing method considering orthogonal influence, which is improved in that the method comprises the following steps:
acquiring a voltage signal of a flapping bending moment of a blade of the wind turbine generator and a voltage signal of a shimmy bending moment;
and determining the flapping bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the flapping bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Preferably, the acquiring the voltage signal of the flapping bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade includes:
collecting voltage signals of strain gauges positioned in the waving direction in the blades of the wind turbine generator and voltage signals of strain gauges positioned in the shimmy direction;
And respectively isolating and amplifying the voltage signal of the strain gauge in the waving direction and the voltage signal of the strain gauge in the shimmy direction to obtain the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Further, the distance between the longitudinal section of the strain gauge in the waving direction and the strain gauge in the shimmy direction and the flange at the root of the wind turbine generator blade is larger than 0.4D;
And D is the diameter of the cross section of the root of the wind turbine generator blade.
Further, the determining the flapping bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the flapping bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade comprises:
The flapping bending moment M flap and the shimmy bending moment M edge of the wind turbine blade are determined as follows:
Wherein U flap is a voltage signal of a waving moment, U edge is a voltage signal of a shimmy moment, A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, offset _flap is a waving moment deviation, and offset _edge is a shimmy moment deviation.
Further, the first, second, third and fourth calibration coefficients a 1, a 2, a 3 and a 4 are determined as follows:
Wherein U flap_max is the maximum value of the voltage signal of the waving bending moment, U flap_min is the minimum value of the voltage signal of the waving bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, U edge_min is the minimum value of the voltage signal of the shimmy bending moment, and M G is the gravity bending moment of the longitudinal section where the strain gauge is located.
Further, the gravity bending moment M G of the longitudinal section where the strain gauge is located is determined according to the following formula:
MG=GL
Wherein G is the gravity of the blade, and L is the distance between the gravity center of the blade and the longitudinal section of the strain gauge.
Further, the flap bending moment offset _flap and the shimmy bending moment offset _edge are determined as follows:
Wherein U flap_max is the maximum value of the voltage signal of the flapping bending moment, U flap_min is the minimum value of the voltage signal of the flapping bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, and U edge_min is the minimum value of the voltage signal of the shimmy bending moment.
Based on the same inventive concept, the invention also provides a wind turbine generator blade bending moment testing device considering orthogonal influence, which is improved in that the device comprises:
The acquisition unit is used for acquiring voltage signals of the bending moment of the wind turbine blade and voltage signals of the shimmy bending moment;
And the testing unit is used for determining the waving bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Preferably, the acquiring unit is specifically configured to:
collecting voltage signals of strain gauges positioned in the waving direction in the blades of the wind turbine generator and voltage signals of strain gauges positioned in the shimmy direction;
And respectively isolating and amplifying the voltage signal of the strain gauge in the waving direction and the voltage signal of the strain gauge in the shimmy direction to obtain the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Further, the test unit is specifically configured to:
The flapping bending moment M flap and the shimmy bending moment M edge of the wind turbine blade are determined as follows:
Wherein U flap is a voltage signal of a waving moment, U edge is a voltage signal of a shimmy moment, A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, offset _flap is a waving moment deviation, and offset _edge is a shimmy moment deviation.
Compared with the closest prior art, the invention has the following beneficial effects:
The invention provides a wind turbine generator blade bending moment testing method and device considering orthogonal influence, comprising the steps of obtaining a voltage signal of a wind turbine generator blade waving bending moment and a voltage signal of a shimmy bending moment, determining the waving bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the wind turbine generator blade waving bending moment and the voltage signal of the shimmy bending moment;
When the voltage signal of the bending moment of the wind turbine generator blade and the voltage signal of the shimmy bending moment are obtained, the distance limit value of the position of the strain gauge and the flange position of the root of the blade is set, and the influence of the local stress of the flange on the test result is avoided.
Drawings
FIG. 1 is a flow chart of a wind turbine blade bending moment testing method considering orthogonal influence;
FIG. 2 is a schematic illustration of a strain gage attachment in an embodiment of the invention;
FIG. 3 is a schematic diagram of a wind turbine blade bending moment testing device considering orthogonal influences.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a wind turbine generator blade bending moment testing method considering orthogonal influence, as shown in fig. 1, the method comprises the following steps:
acquiring a voltage signal of a flapping bending moment of a blade of the wind turbine generator and a voltage signal of a shimmy bending moment;
and determining the flapping bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the flapping bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
For the purpose of illustrating the invention more clearly, the invention is further described below with reference to specific examples.
In the above embodiment of the present invention, the obtaining the voltage signal of the flapping bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade includes:
collecting voltage signals of strain gauges positioned in the waving direction in the blades of the wind turbine generator and voltage signals of strain gauges positioned in the shimmy direction;
And respectively isolating and amplifying the voltage signal of the strain gauge in the waving direction and the voltage signal of the strain gauge in the shimmy direction to obtain the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Specifically, in the embodiment, as shown in fig. 2a, a strain gauge is preset in a waving direction and is adhered in a shimmy direction, a traditional adhering resistance type strain gauge is adopted to build a wheatstone bridge to realize strain measurement of a measured position, and as shown in fig. 2b, the distance L0 between the longitudinal section of the strain gauge and a flange at the root of a wind turbine generator blade is greater than 0.4D, wherein D is the diameter of the cross section of the wind turbine generator blade root, and meanwhile, in order to influence external environment factors on a test result, the strain gauge is subjected to dampproof treatment.
Those skilled in the art know that the blade bending moment test is critical in determining the relationship between the acquired voltage signal and the actual bending moment amount, namely the following formula:
M=slope*U+offset
wherein M is a bending moment and a bending moment, U is a voltage signal, slope is a slope, and offset is a deviation;
However, in a specific working condition, the actual strain position may not be in the position of the shimmy direction and the waving direction of the strain gauge, so that the shimmy bending moment affects the waving bending moment, and the waving bending moment affects the shimmy bending moment, namely, the generation of orthogonal sensitivity, therefore, the orthogonal sensitivity relation between the shimmy bending moment signal and the shimmy bending moment signal needs to be determined to correct the bending moment, and the calibration coefficient should satisfy the following formula:
Wherein A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, U flap is a voltage signal of a bending moment of waving, U edge is a voltage signal of a bending moment of shimmy, and M edge、Mflap is respectively the bending moment of shimmy and waving.
Therefore, in the above embodiment of the present invention, the determining the flapping moment and the shimmy moment of the wind turbine blade according to the voltage signal of the flapping moment and the voltage signal of the shimmy moment of the wind turbine blade includes:
The flapping bending moment M flap and the shimmy bending moment M edge of the wind turbine blade are determined as follows:
Wherein U flap is a voltage signal of a waving moment, U edge is a voltage signal of a shimmy moment, A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, offset _flap is a waving moment deviation, and offset _edge is a shimmy moment deviation.
The known waving bending moment and shimmy bending moment also have the following formula:
Wherein, theta e is the blade pitch angle, theta f is the blade rotation azimuth angle, and M G is the gravity bending moment of the longitudinal section where the strain gauge is positioned.
Therefore, in the embodiment of the present invention, the method of calibrating the special pitch angle is used to determine the first calibration coefficient a 1, the second calibration coefficient a 2, the third calibration coefficient a 3, the fourth calibration coefficient a 4, the swing bending moment offset _flap and the shimmy bending moment offset _edge, which specifically include the following steps:
1) In the small wind state, the pitch angle of the blades is fixed to be 0 DEG, and the unit idles for 2-3 circles
Θ e＝0°,Mflap =0, there is
And thus it is possible to obtain a light-emitting diode,
2) In the small wind state, the pitch angle of the blades is fixed to be 90 degrees, and the unit jigger is 2-3 circles
Θ e＝90°,Medge =0, there is
And thus it is possible to obtain a light-emitting diode,
3) In the small wind state, the pitch angle of the blades is fixed to be 45 degrees, and the unit jigger is 2-3 circles
θe=45°,Then there isAnd
And thus it is possible to obtain a light-emitting diode,And
4) When the bending moment of waving reaches the maximum, the following formula is adopted:
when the flapping bending moment reaches the minimum, the following formula exists:
Because of M flap_max＝-Mflap_min and M edge_max＝-Medge_min, it is possible to:
Wherein U flap_max is the maximum value of the voltage signal of the waving bending moment, U flap_min is the minimum value of the voltage signal of the waving bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, U edge_min is the minimum value of the voltage signal of the shimmy bending moment, and M G is the gravity bending moment of the longitudinal section where the strain gauge is located.
In the embodiment of the present invention, in order to make the final result more accurate, the maximum value and the minimum value of the voltage signal are average values of three times or more.
Further, the gravity bending moment M G of the longitudinal section where the strain gauge is located is determined according to the following formula:
MG=GL
Wherein G is the gravity of the blade, and L is the distance between the gravity center of the blade and the longitudinal section of the strain gauge.
Based on the same inventive concept, the invention also provides a wind turbine generator blade bending moment testing device considering orthogonal influence, as shown in fig. 3, the device comprises:
The acquisition unit is used for acquiring voltage signals of the bending moment of the wind turbine blade and voltage signals of the shimmy bending moment;
And the testing unit is used for determining the waving bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Preferably, the acquiring unit is specifically configured to:
collecting voltage signals of strain gauges positioned in the waving direction in the blades of the wind turbine generator and voltage signals of strain gauges positioned in the shimmy direction;
And respectively isolating and amplifying the voltage signal of the strain gauge in the waving direction and the voltage signal of the strain gauge in the shimmy direction to obtain the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
Further, the test unit is specifically configured to:
The flapping bending moment M flap and the shimmy bending moment M edge of the wind turbine blade are determined as follows:
Wherein U flap is a voltage signal of a waving moment, U edge is a voltage signal of a shimmy moment, A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, offset _flap is a waving moment deviation, and offset _edge is a shimmy moment deviation.
Further, the distance between the longitudinal section of the strain gauge in the waving direction and the strain gauge in the shimmy direction and the flange at the root of the wind turbine generator blade is larger than 0.4D;
And D is the diameter of the cross section of the root of the wind turbine generator blade.
Further, the first, second, third and fourth calibration coefficients a 1, a 2, a 3 and a 4 are determined as follows:
Wherein U flap_max is the maximum value of the voltage signal of the waving bending moment, U flap_min is the minimum value of the voltage signal of the waving bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, U edge_min is the minimum value of the voltage signal of the shimmy bending moment, and M G is the gravity bending moment of the longitudinal section where the strain gauge is located.
Further, the gravity bending moment M G of the longitudinal section where the strain gauge is located is determined according to the following formula:
MG=GL
Wherein G is the gravity of the blade, and L is the distance between the gravity center of the blade and the longitudinal section of the strain gauge.
Further, the flap bending moment offset _flap and the shimmy bending moment offset _edge are determined as follows:
Wherein U flap_max is the maximum value of the voltage signal of the flapping bending moment, U flap_min is the minimum value of the voltage signal of the flapping bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, and U edge_min is the minimum value of the voltage signal of the shimmy bending moment.
In summary, the wind turbine blade bending moment testing method and device based on orthogonal influence comprise the steps of obtaining voltage signals of the wind turbine blade waving bending moment and voltage signals of the shimmy bending moment, determining the waving bending moment and the shimmy bending moment of the wind turbine blade according to the voltage signals of the wind turbine blade waving bending moment and the voltage signals of the shimmy bending moment;
When the voltage signal of the bending moment of the wind turbine generator blade and the voltage signal of the shimmy bending moment are obtained, the distance limit value of the position of the strain gauge and the flange position of the root of the blade is set, and the influence of the local stress of the flange on the test result is avoided.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and any modifications and equivalents are intended to be included in the scope of the claims of the present invention.
Claims (6)
1. A wind turbine generator blade bending moment testing method considering orthogonal influence is characterized by comprising the following steps:
acquiring a voltage signal of a flapping bending moment of a blade of the wind turbine generator and a voltage signal of a shimmy bending moment;
Determining the flapping bending moment and the shimmy bending moment of the blades of the wind turbine generator according to the voltage signals of the flapping bending moment and the voltage signals of the shimmy bending moment of the blades of the wind turbine generator;
The method for determining the flapping bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signal of the flapping bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade comprises the following steps:
The flapping bending moment M flap and the shimmy bending moment M edge of the wind turbine blade are determined as follows:
Wherein U flap is a voltage signal of a waving moment, U edge is a voltage signal of a shimmy moment, A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, offset _flap is a waving moment deviation, and offset _edge is a shimmy moment deviation;
The method for calibrating the special pitch angle is used for determining the first calibration coefficient A 1, the second calibration coefficient A 2, the third calibration coefficient A 3, the fourth calibration coefficient A 4, the swing bending moment offset _flap and the shimmy bending moment offset _edge, and comprises the following specific steps:
in the small wind state, the pitch angle of the blades is fixed to be 0 DEG, and the unit idles for 2-3 circles
Θ e＝0°,Mflap =0, there is
And thus it is possible to obtain a light-emitting diode,
In the small wind state, the pitch angle of the blades is fixed to be 90 degrees, and the unit jigger is 2-3 circles
Θ e＝90°,Medge =0, there is
And thus it is possible to obtain a light-emitting diode,
In the small wind state, the pitch angle of the blades is fixed to be 45 degrees, and the unit jigger is 2-3 circles
θe=45°,Then there is
And thus it is possible to obtain a light-emitting diode,And
When the bending moment of waving reaches the maximum, the following formula is adopted:
when the flapping bending moment reaches the minimum, the following formula exists:
Based on M flap_max＝-Mflap_min and M edge_max＝-Medge_min, the flap moment offset _flap and the shimmy moment offset _edge are determined:
Wherein U flap_max is the maximum value of the voltage signal of the flapping bending moment, U flap_min is the minimum value of the voltage signal of the flapping bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, U edge_min is the minimum value of the voltage signal of the shimmy bending moment, and M G is the gravity bending moment.
2. The method of claim 1, wherein the obtaining the voltage signal of the wind turbine blade flapping bending moment and the voltage signal of the shimmy bending moment comprises:
collecting voltage signals of strain gauges positioned in the waving direction in the blades of the wind turbine generator and voltage signals of strain gauges positioned in the shimmy direction;
And respectively isolating and amplifying the voltage signal of the strain gauge in the waving direction and the voltage signal of the strain gauge in the shimmy direction to obtain the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
3. The method of claim 2, wherein the distance between the longitudinal section of the strain gauge in the flapwise direction and the strain gauge in the shimmy direction and the flange at the root of the wind turbine blade is greater than 0.4D;
And D is the diameter of the cross section of the root of the wind turbine generator blade.
4. The method of claim 2, wherein the gravity bending moment M G of the longitudinal section in which the strain gauge is located is determined as follows:
MG=GL
Wherein G is the gravity of the blade, and L is the distance between the gravity center of the blade and the longitudinal section of the strain gauge.
5. Wind turbine blade bending moment testing device considering orthogonal influences, which is characterized by comprising:
The acquisition unit is used for acquiring voltage signals of the bending moment of the wind turbine blade and voltage signals of the shimmy bending moment;
The testing unit is used for determining the waving bending moment and the shimmy bending moment of the wind turbine generator blade according to the voltage signals of the waving bending moment and the shimmy bending moment of the wind turbine generator blade;
The test unit is specifically configured to:
The flapping bending moment M flap and the shimmy bending moment M edge of the wind turbine blade are determined as follows:
Wherein U flap is a voltage signal of a waving moment, U edge is a voltage signal of a shimmy moment, A 1 is a first calibration coefficient, A 2 is a second calibration coefficient, A 3 is a third calibration coefficient, A 4 is a fourth calibration coefficient, offset _flap is a waving moment deviation, and offset _edge is a shimmy moment deviation;
The method for calibrating the special pitch angle is used for determining the first calibration coefficient A 1, the second calibration coefficient A 2, the third calibration coefficient A 3, the fourth calibration coefficient A 4, the swing bending moment offset _flap and the shimmy bending moment offset _edge, and comprises the following specific steps:
in the small wind state, the pitch angle of the blades is fixed to be 0 DEG, and the unit idles for 2-3 circles
Θ e＝0°,Mflap =0, there is
And thus it is possible to obtain a light-emitting diode,
In the small wind state, the pitch angle of the blades is fixed to be 90 degrees, and the unit jigger is 2-3 circles
Θ e＝90°,°Medge =0, there is
And thus it is possible to obtain a light-emitting diode,
In the small wind state, the pitch angle of the blades is fixed to be 45 degrees, and the unit jigger is 2-3 circles
θe＝45°,Then there is
And thus it is possible to obtain a light-emitting diode,And
When the bending moment of waving reaches the maximum, the following formula is adopted:
when the flapping bending moment reaches the minimum, the following formula exists:
Based on M flap_max＝-Mflap_min and M edge_max＝-Medge_min, the flap moment offset _flap and the shimmy moment offset _edge are determined:
Wherein U flap_max is the maximum value of the voltage signal of the flapping bending moment, U flap_min is the minimum value of the voltage signal of the flapping bending moment, U edge_max is the maximum value of the voltage signal of the shimmy bending moment, U edge_min is the minimum value of the voltage signal of the shimmy bending moment, and M G is the gravity bending moment.
6. The apparatus of claim 5, wherein the acquisition unit is specifically configured to:
collecting voltage signals of strain gauges positioned in the waving direction in the blades of the wind turbine generator and voltage signals of strain gauges positioned in the shimmy direction;
And respectively isolating and amplifying the voltage signal of the strain gauge in the waving direction and the voltage signal of the strain gauge in the shimmy direction to obtain the voltage signal of the waving bending moment and the voltage signal of the shimmy bending moment of the wind turbine generator blade.
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