CN108691730B - Wind driven generator system, wind energy data error correction method and yaw control method - Google Patents
Wind driven generator system, wind energy data error correction method and yaw control method Download PDFInfo
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- 238000012937 correction Methods 0.000 title claims abstract description 33
- 230000006698 induction Effects 0.000 claims abstract description 347
- 238000001514 detection method Methods 0.000 claims abstract description 107
- 238000004364 calculation method Methods 0.000 claims description 208
- 238000012545 processing Methods 0.000 claims description 30
- 238000000354 decomposition reaction Methods 0.000 claims description 12
- 230000025518 detection of mechanical stimulus involved in sensory perception of wind Effects 0.000 claims description 5
- 230000002194 synthesizing effect Effects 0.000 abstract description 10
- 238000010248 power generation Methods 0.000 description 6
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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
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0204—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor for orientation in relation to wind direction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/32—Wind speeds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/321—Wind directions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention relates to a wind driven generator system, a wind energy data error correction method and a yaw control method.A wind energy data detection device detects an initial wind speed vector, the initial wind speed vector is orthogonally decomposed into an initial wind speed axial vector and an initial wind speed tangential vector, and then the tangential speed vector of wake flow at the wind energy data detection device is calculated according to parameters such as tangential induction factors of the wake flow of a fan and the like; and finally, synthesizing the corrected wind speed tangential vector with the initial wind speed axial vector to obtain the corrected wind speed vector. The corrected wind speed tangential vector eliminates the fan wake factor, so that the corrected wind speed tangential vector is synthesized with the initial wind speed axial vector, the synthesized wind speed and direction are basically consistent with the actual wind speed and direction in front of the fan, the deviation between the detected wind energy data and the actual wind energy data is eliminated, the authenticity of the data is ensured, and the subsequent yaw control is facilitated.
Description
Technical Field
The invention relates to a wind driven generator system, a wind energy data error correction method and a yaw control method.
Background
In recent 20 years, the wind power generation market is rapidly developed worldwide, a plurality of wind power generation equipment suppliers emerge at home and abroad, the competition among the wind power generation equipment suppliers is intensified day by day, and the improvement of the stability and the power generation efficiency of a fan is the key focus of the wind power generation equipment suppliers and the wind power station. The wind wheel to wind error is a key factor influencing the generating efficiency of the fan.
A conventional wind vane and wind speed measurement instrument is mounted behind the wind wheel, above the nacelle, as shown in fig. 1. Furthermore, chinese patent application publication No. CN104454349A discloses a wind turbine system, which includes a blade, a wind vane, and a wind speed measuring instrument, where the wind vane and the wind speed measuring instrument are also disposed behind the wind wheel and above the nacelle. The measured wind energy data is transmitted to the industrial controller through the wind vane and the wind speed measuring instrument so as to adjust the windward angle of the wind turbine and realize the maximized wind energy utilization. The anemoscope and the wind speed measuring instrument can be two independent devices, one is used for detecting wind direction information, the other is used for detecting wind speed information, and of course, the two devices can also be collectively called as wind energy data detection devices to detect wind direction and wind speed. However, when parallel wind passes through the wind wheel, the wind wheel is pushed to rotate, and simultaneously, the parallel wind rotates in the opposite direction to form a spiral wake, and under the influence of the wake, the wind direction measured by a wind direction indicator (or referred to as wind energy data detection equipment) deviates from the wind direction in front of the wind wheel, namely the wind direction detected by the wind direction indicator deviates from the real wind direction. The wind direction driving yaw system measured by the yaw system with reference to the anemoscope obviously cannot accurately align wind, yaw errors can cause the wind sweeping area of a wind wheel to be reduced, and the power generation efficiency is further reduced.
Disclosure of Invention
The invention aims to provide a wind energy data error correction method of a wind driven generator, which is used for solving the problem that deviation exists between wind energy data detected by wind energy data detection equipment and real wind energy data. The invention also provides a yaw control method of the wind driven generator and two wind driven generator systems.
In order to achieve the above object, the present invention includes the following technical solutions.
A wind energy data error correction method of a wind driven generator comprises the following steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment, and decomposing the initial wind speed vector into an initial wind speed axial vector and an initial wind speed tangential vector, wherein the initial wind speed axial vector is parallel to the normal of a wind wheel plane, and the initial wind speed tangential vector is parallel to the tangential of the wind wheel plane;
(2) calculating a tangential velocity vector of the wake flow at the wind energy data detection device according to the tangential induction factor of the wake flow of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbine;
(3) and calculating to obtain a corrected wind speed tangential vector according to the initial wind speed tangential vector and the tangential velocity vector, and synthesizing the corrected wind speed tangential vector and the initial wind speed axial vector to obtain a corrected wind speed vector.
Firstly, carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment to obtain an initial wind speed axial vector and an initial wind speed tangential vector, and then calculating the tangential speed vector of the wake flow at the wind energy data detection equipment according to the tangential induction factor of the wake flow of the fan, the rotating speed of the wind wheel and the height of the wind energy data detection equipment relative to the center of the plane of the wind wheel; and finally, synthesizing the corrected wind speed tangential vector with the initial wind speed axial vector to obtain the corrected wind speed vector. Because the corrected wind speed tangential vector eliminates the fan wake factor, the corrected wind speed tangential vector is synthesized with the initial wind speed tangential vector, the synthesized wind speed and direction are basically consistent with the wind speed and direction of natural wind (namely the actual wind speed and direction in front of the fan), the deviation between the detected wind energy data and the real wind energy data is eliminated, the authenticity of the data is ensured, and the subsequent yaw control is facilitated.
Further, the calculation process of the tangential induction factor of the fan wake comprises the following steps:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angle
The calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
The wind wheel axial moment coefficient and the wind wheel tangential moment coefficient are known values, so that a blade supplier can directly provide the values, and the calculation of the induced factors is more convenient and higher in precision than the calculation of the induced factors by using parameters such as the lift coefficient, the resistance coefficient and the like of the blades.
Further, the tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
Further, the corrected wind speed tangential vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
A yaw control method of a wind driven generator comprises the following steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment, and decomposing the initial wind speed vector into an initial wind speed axial vector and an initial wind speed tangential vector, wherein the initial wind speed axial vector is parallel to the normal of a wind wheel plane, and the initial wind speed tangential vector is parallel to the tangential of the wind wheel plane;
(2) calculating a tangential velocity vector of the wake flow at the wind energy data detection device according to the tangential induction factor of the wake flow of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbine;
(3) calculating according to the initial wind speed tangential vector and the tangential velocity vector to obtain a corrected wind speed tangential vector, and synthesizing the corrected wind speed tangential vector and the initial wind speed axial vector to obtain a corrected wind speed vector;
(4) and carrying out yaw control according to the corrected wind speed vector.
Further, the calculation process of the tangential induction factor of the fan wake comprises the following steps:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angle
The calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
Further, the tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
Further, the corrected wind speed tangential vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
A wind driven generator system comprises wind energy data detection equipment, wherein the wind energy data detection equipment is used for detecting wind speed information and wind direction information, the wind speed information and the wind direction information detected and output by the wind energy data detection equipment form an initial wind speed vector, the wind driven generator system further comprises a data processing unit, the output end of a detection signal of the wind energy data detection equipment is connected with the data processing unit in an output mode, the data processing unit executes an error correction strategy, and the error correction strategy comprises the following implementation steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment, and decomposing the initial wind speed vector into an initial wind speed axial vector and an initial wind speed tangential vector, wherein the initial wind speed axial vector is parallel to the normal of a wind wheel plane, and the initial wind speed tangential vector is parallel to the tangential of the wind wheel plane;
(2) calculating a tangential velocity vector of the wake flow at the wind energy data detection device according to the tangential induction factor of the wake flow of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbine;
(3) and calculating to obtain a corrected wind speed tangential vector according to the initial wind speed tangential vector and the tangential velocity vector, and synthesizing the corrected wind speed tangential vector and the initial wind speed axial vector to obtain a corrected wind speed vector.
Further, the calculation process of the tangential induction factor of the fan wake comprises the following steps:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angleThe calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel,v1the wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
Further, the tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
Further, the corrected wind speed tangential vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
A wind driven generator system comprises wind energy data detection equipment and a yaw subsystem, wherein the wind energy data detection equipment is used for detecting wind speed information and wind direction information, the wind speed information and the wind direction information detected and output by the wind energy data detection equipment form an initial wind speed vector, the wind driven generator system further comprises a data processing unit, a detection signal output end of the wind energy data detection equipment is in output connection with the data processing unit, a signal output end of the data processing unit is in output connection with the yaw subsystem, the data processing unit executes an error correction strategy, and the error correction strategy comprises the following implementation steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment, and decomposing the initial wind speed vector into an initial wind speed axial vector and an initial wind speed tangential vector, wherein the initial wind speed axial vector is parallel to the normal of a wind wheel plane, and the initial wind speed tangential vector is parallel to the tangential of the wind wheel plane;
(2) calculating a tangential velocity vector of the wake flow at the wind energy data detection device according to the tangential induction factor of the wake flow of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbine;
(3) calculating according to the initial wind speed tangential vector and the tangential velocity vector to obtain a corrected wind speed tangential vector, and synthesizing the corrected wind speed tangential vector and the initial wind speed axial vector to obtain a corrected wind speed vector;
and the yaw subsystem carries out yaw control according to the corrected wind speed vector obtained by the processing of the data processing unit.
Further, the calculation process of the tangential induction factor of the fan wake comprises the following steps:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angleThe calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
Further, the tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
Further, the corrected wind speed tangential vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
Drawings
FIG. 1 is a schematic view of a wind turbine;
FIG. 2 is a schematic flow chart of a wind energy data error correction method for a wind turbine;
FIG. 3-a is an exploded view-top view of the wind direction of the left side of the wind turbine;
FIG. 3-b is an exploded view-rear view-of the left side incoming wind direction of the wind turbine;
FIG. 4-a is an exploded view-top view of the wind direction coming from the right side of the wind turbine;
FIG. 4-b is an exploded view of the wind direction on the right side of the wind turbine-rear view;
fig. 5 is a schematic view of a second embodiment of a wind turbine system.
Detailed Description
Embodiment one of wind power generator system
The embodiment provides a wind power generator system, which comprises wind energy data detection equipment, wherein the wind energy data detection equipment is used for detecting wind speed information and wind direction information, and the wind energy data detection equipment does not need to be an expensive high-end detection instrument and can be a cheap mechanical anemorumbometer. Since one of the wind speed information and the wind direction information is a numerical value and the other is a direction, the wind speed information and the wind direction information detected and output by the wind energy data detection device constitute a wind speed vector, which is called an initial wind speed vector. In order to process the initial wind speed vector detected and output by the wind energy data detection equipment, the wind driven generator system further comprises a data processing unit, the output end of a detection signal of the wind energy data detection equipment is connected with the data processing unit, and a software program is loaded in the data processing unit and corresponds to an error correction strategy to correct the error of the initial wind speed vector. The wind energy data detection device belongs to the existing device and is not described in detail here. The data processing unit can be a control device originally existing in the system or a specially arranged control device. In addition, the wind power generator system further includes other components, such as a generator, etc., which are not specifically described herein since they are not inventive points.
In this embodiment, a storage unit (alternatively referred to as a fan blade information unit) for storing parameters required in the error correction strategy and a data processing unit are integrated to form a soft measurement module, and therefore, the soft measurement module is an added functional block of the present invention.
The inventive point of the wind turbine system is therefore an error correction strategy in the data processing unit and not in the hardware structure of the wind turbine system.
As shown in fig. 2, the error correction strategy comprises the following steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector v output by detection of wind energy data detection equipment to obtain an initial wind speed axial vector vdAnd an initial wind speed tangent vector vqAxial vector v of initial wind speeddParallel to the normal of the plane of the wind wheel, and the initial wind speed tangent vector vqTangential parallel to the plane of the rotor. And if theta is an included angle between the wind direction measured by the wind energy data detection equipment and a normal vector of a plane of a wind wheel of the fan, a calculation formula of a wind speed component v is as follows:
(2) calculating a tangential velocity vector v of the wake at the wind energy data detection device according to the tangential induction factor a' of the wake, the angular velocity omega of the wind wheel rotation and the height h of the wind energy data detection device relative to the center of the plane of the wind wheelqh。
(3) According to the initial wind speed tangent vector vqWith the tangential velocity vector vqhCalculating to obtain a corrected wind speed tangential vector vqsCutting the corrected wind speed to the vector vqsAxial vector v of initial wind speeddAnd synthesizing to obtain the corrected wind speed vector.
A specific implementation of the above steps (2) and (3) is given below, but the present invention is not limited to the implementation below.
In the step (2), the tangential induction factor a 'of the fan wake may be obtained empirically or by calculation, and in this embodiment, the tangential induction factor a' of the fan wake is obtained by calculation. Since the tangential induction factor a 'of the fan wake corresponds to the axial induction factor a, the calculation of the axial induction factor a is also involved in the calculation of the tangential induction factor a'. Then, the calculation process of the tangential induction factor a' of the wind turbine wake includes the following steps:
1) initializing an axial induction factor a and a tangential induction factor a ', and setting initial values of the axial induction factor a and the tangential induction factor a' to be zero.
2) Calculating the inflow angle
The calculation formula is as follows:
wherein v is1Is the wind speed in front of the plane of the wind wheel and at a distance from the plane of the wind wheel greater than a set threshold value, i.e. v1The wind speed which flows through the far front part of the plane of the wind wheel is not influenced by the wind wheel, and the wind speed value v of the far front part of the plane of the wind wheel is replaced by the wind speed value measured by the wind energy data detection equipment arranged on the cabin of the wind wheel, which is obtained by statistical analysis because no equipment for detecting the wind speed is arranged in the front of the plane of the wind wheel of the wind turbine in general1Is acceptable, therefore, here, v1The value of (1) is the wind speed value measured by the wind energy data detection equipment.
3) The axial induction factor a and the tangential induction factor a' are recalculated using the following calculation:
wherein, CxIs the axial moment coefficient of the wind wheel, CyIs the tangential moment coefficient of the wind wheel, CxAnd CyKnown values may be provided by the blade supplier or the complete machine manufacturer, typically measured by wind tunnel experiments.
σ is the blade solidity, namely the ratio of the chord length of the blade at the radius r to the circumference of the impeller, and the parameter can be directly given or obtained by calculation, and a calculation formula is given as follows:
in the formula, B represents the number of the fan blades, and the current three-blade fan is the mainstream, so B is generally equal to 3; r is the height from the wind direction measuring point of the wind energy data detection equipment to the center of the hub of the fan, and the parameter is determined after the fan is installed and can be found in a fan installation drawing; c is the chord length of each blade at the radius r of the plane of the wind wheel (the plane of the wind wheel is a circular plane), the chord length of the blade is not the same at each radius of the blade, the geometric dimension of the blade is provided by the blade manufacturer, and the chord length of the blade at a certain point can be checked from the blade drawing.
Because the blades generally do not occupy the whole impeller space (gaps are formed among the blades), the blade solidity sigma is usually smaller than 1, and because the blade solidity sigma is not equal to zero, the blade solidity sigma is inevitably larger than 0, and therefore, the value range of the blade solidity sigma is sigma epsilon (0, 1). Therefore, the blade solidity σ can be obtained directly from experience or through a specific calculation process.
4) Comparing the axial induction factor obtained by the first calculation with the initialized axial induction factor and the tangential induction factor obtained by the first calculation with the initialized tangential induction factor, if the error between the axial induction factor obtained by the first calculation and the initialized axial induction factor is larger than a first set error value and/or the error between the tangential induction factor obtained by the first calculation and the initialized tangential induction factor is larger than a second set error value, recalculating the axial induction factor a and the tangential induction factor a' according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, and then calculating and comparing the corresponding errors according to the comparison process, namely comparing the axial induction factor obtained by the second calculation with the axial induction factor obtained by the first calculation, and the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is greater than a first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is greater than a second set error value, recalculating the axial induction factor a and the tangential induction factor a' according to the steps 2) and 3) by using the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation as parameters, and then calculating and comparing corresponding errors according to the comparison process, namely comparing the axial induction factor obtained by the third calculation with the axial induction factor obtained by the second calculation, and comparing the tangential induction factor obtained by the third calculation with the tangential induction factor obtained by the second calculation, if the error between the axial induction factor obtained by the third calculation and the axial induction factor obtained by the second calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the third calculation and the tangential induction factor obtained by the second calculation is larger than the second set error value, the tangential induction factor obtained by the third calculation and the axial induction factor obtained by the third calculation are used as parameters, and the axial induction factor a and the tangential induction factor a' are recalculated according to the steps 2) and 3), and then the corresponding errors are calculated and compared according to the comparison process, and so on until the following conditions are met: and if the error between the axial induction factor obtained by a certain calculation and the axial induction factor obtained by the last calculation is less than or equal to a first set error value, and the error between the tangential induction factor obtained by a certain calculation and the tangential induction factor obtained by the last calculation is less than or equal to a second set error value, the axial induction factor and the tangential induction factor obtained by the certain calculation are the required axial induction factor a and the tangential induction factor a'.
Therefore, the fan wake flow induction factor adopts a recursion algorithm, and a wake flow axial induction factor a and a tangential induction factor a' are calculated by using relevant parameters in a recursion manner, if the absolute values of the differences between the induction factors and the previous result are less than or equal to the corresponding set error values (in the embodiment, the first set error value and the second set error value are both 0.001), the loop calculation is exited, and if not, the loop calculation is returned to the steps 2) and 3) to continue the loop.
In step 2), a tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein, the tangential induction factor a' can be obtained by experience as well as the calculation process; the rotating angular speed omega of the wind wheel can be detected and obtained by rotating speed detection equipment arranged on the wind wheel, and the height h of the wind energy data detection equipment relative to the plane center of the wind wheel can be obtained when the wind energy data detection equipment is initially installed.
In step 3), the corrected wind speed tangent vector vqsThe calculation formula of the tangential component of the wind speed in front of the wind wheel on the plane of the wind wheel is as follows:
vqs＝vq-vqh
corrected wind speed tangent vector vqsAxial vector v of initial wind speeddSynthesizing to obtain corrected wind speed vector, i.e. new wind speed and direction and new wind direction
Tangent vector vqsFactors of draught fan wake flow are eliminated, so that the synthetic wind speed and the wind direction are basically consistent with the wind direction of natural wind, error correction is carried out on actual detection data, and deviation between the actual detection data and a true value is reduced.
FIG. 3-a is an exploded view-top view of the wind direction of the left side of the wind turbine; FIG. 3-b is an exploded view-rear view-of the left side incoming wind direction of the wind turbine; FIG. 4-a is an exploded view-top view of the wind direction coming from the right side of the wind turbine; FIG. 4-b is an exploded view of the wind direction on the right side of the wind turbine-rear view.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the implementation process of the error correction strategy, and not in the implementation system of the error correction strategy, and on the basis of the error correction strategy, any hardware system is within the protection scope of the present invention.
Wind energy data error correction method embodiment of wind driven generator
The embodiment provides a wind energy data error correction method of a wind driven generator, which comprises the following implementation steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment, and decomposing the initial wind speed vector into an initial wind speed axial vector and an initial wind speed tangential vector, wherein the initial wind speed axial vector is parallel to the normal of a wind wheel plane, and the initial wind speed tangential vector is parallel to the tangential of the wind wheel plane;
(2) calculating a tangential velocity vector of the wake flow at the wind energy data detection device according to the tangential induction factor of the wake flow of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbine;
(3) and calculating to obtain a corrected wind speed tangential vector according to the initial wind speed tangential vector and the tangential velocity vector, and synthesizing the corrected wind speed tangential vector and the initial wind speed axial vector to obtain a corrected wind speed vector.
Since the error correction method is described in detail in the first embodiment of the wind turbine system, the embodiment will not be described in detail.
Second embodiment of wind turbine System
The embodiment provides a wind power generator system, which comprises a wind energy data detection device, a data processing unit and a yaw subsystem, wherein the wind energy data detection device is already described in the first embodiment of the wind power generator system, and is not specifically described here. The yaw subsystem implements yaw control, which in this embodiment includes a yaw controller and a yaw drive system, as shown in FIG. 5. The output of the detection signal output end of the wind energy data detection equipment is connected with the data processing unit, and the output of the signal output end of the data processing unit is connected with a yaw controller in the yaw subsystem.
And a software program is loaded in the data processing unit, and the software program performs error correction on the initial wind speed vector corresponding to the error correction strategy.
Since the error correction strategy has been described in detail in the above-mentioned first embodiment of the wind turbine system, it will not be described in detail here.
The data processing unit cuts the corrected wind speed into a vector vqsAxial vector v of initial wind speeddAnd synthesizing to obtain the corrected wind speed vector, namely the new wind speed and direction. And the data processing unit outputs the corrected wind speed and wind direction to the yaw controller, and the yaw controller performs yaw control according to the new wind speed and wind direction. Since the yaw control process is prior art, it will not be described in detail here.
Yaw control method embodiment of wind driven generator
The embodiment provides a yaw control method of a wind driven generator, which comprises the following implementation steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector detected and output by wind energy data detection equipment, and decomposing the initial wind speed vector into an initial wind speed axial vector and an initial wind speed tangential vector, wherein the initial wind speed axial vector is parallel to the normal of a wind wheel plane, and the initial wind speed tangential vector is parallel to the tangential of the wind wheel plane;
(2) calculating a tangential velocity vector of the wake flow at the wind energy data detection device according to the tangential induction factor of the wake flow of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbine;
(3) calculating according to the initial wind speed tangential vector and the tangential velocity vector to obtain a corrected wind speed tangential vector, and synthesizing the corrected wind speed tangential vector and the initial wind speed axial vector to obtain a corrected wind speed vector;
(4) and carrying out yaw control according to the corrected wind speed vector.
Since the yaw control method is described in detail in the first and second embodiments of the wind turbine system, it will not be described in detail here.
Claims (16)
1. A wind energy data error correction method of a wind driven generator is characterized by comprising the following steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector v output by detection of wind energy data detection equipment to obtain an initial wind speed axial vector vdAnd an initial wind speed tangent vector vqInitial wind speed axisVector vdParallel to the normal of the plane of the wind wheel, and the initial wind speed tangent vector vqTangential parallel to the plane of the wind wheel;
(2) calculating a tangential velocity vector v of the wake at the wind energy data detection device according to the tangential induction factor of the wake of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbineqh；
(3) According to the initial wind speed tangent vector vqWith said tangential velocity vector vqhCalculating to obtain a corrected wind speed tangential vector vqsCutting the corrected wind speed into vector vqsAnd the initial wind speed axial vector vdSynthesizing to obtain corrected wind speed vector and wind direction of the corrected wind speed vector
2. The wind energy data error correction method of a wind power generator of claim 1, wherein the calculation process of the tangential induction factor of the wind turbine wake comprises the following steps:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angle
The calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
3. Wind energy data error correction method of a wind power generator according to claim 1 or 2,
said tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
4. The wind energy data error correction method of a wind power generator according to claim 3,
the corrected wind speed tangent vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
5. A yaw control method of a wind driven generator is characterized by comprising the following steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector v output by detection of wind energy data detection equipment to obtain an initial wind speed axial vector vdAnd an initial wind speed tangent vector vqAxial vector v of initial wind speeddParallel to the normal of the plane of the wind wheel, and the initial wind speed tangent vector vqTangential parallel to the plane of the wind wheel;
(2) calculating a tangential velocity vector v of the wake at the wind energy data detection device according to the tangential induction factor of the wake of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbineqh；
(3) According to the initial wind speed tangent vector vqWith said tangential velocity vector vqhCalculating to obtain a corrected wind speed tangential vector vqsCutting the corrected wind speed into vector vqsAnd the initial wind speed axial vector vdSynthesizing to obtain corrected wind speed vector and wind direction of the corrected wind speed vector
(4) And carrying out yaw control according to the corrected wind speed vector.
6. The wind turbine yaw control method of claim 5, wherein the calculation of the tangential induction factor of the wind turbine wake comprises the steps of:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angle
The calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
7. The wind turbine yaw control method according to claim 5 or 6,
said tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
8. The wind turbine yaw control method of claim 7,
the corrected wind speed tangent vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
9. A wind driven generator system comprises wind energy data detection equipment, wherein the wind energy data detection equipment is used for detecting wind speed information and wind direction information, and the wind speed information and the wind direction information output by the wind energy data detection equipment form an initial wind speed vector, and is characterized by further comprising a data processing unit, wherein the detection signal output end of the wind energy data detection equipment is in output connection with the data processing unit, the data processing unit executes an error correction strategy, and the error correction strategy comprises the following implementation steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector v output by detection of wind energy data detection equipment to obtain an initial wind speed axial vector vdAnd an initial wind speed tangent vector vqAxial vector v of initial wind speeddParallel to the normal of the plane of the wind wheel, and the initial wind speed tangent vector vqTangential parallel to the plane of the wind wheel;
(2) calculating a tangential velocity vector v of the wake at the wind energy data detection device according to the tangential induction factor of the wake of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbineqh；
(3) According to the initial wind speed tangent vector vqWith said tangential velocity vector vqhCalculating to obtain a corrected wind speed tangential vector vqsCutting the corrected wind speed into vector vqsAnd the initial wind speed axial vector vdSynthesizing to obtain corrected wind speed vector and wind direction of the corrected wind speed vector
10. Wind generator system according to claim 9, wherein the calculation of the tangential induction factor of the wind turbine wake comprises the steps of:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angle
The calculation formula is as follows:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
11. Wind turbine system according to claim 9 or 10,
said tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
12. Wind turbine system according to claim 11,
the corrected wind speed tangent vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
13. A wind driven generator system comprises wind energy data detection equipment and a yaw subsystem, wherein the wind energy data detection equipment is used for detecting wind speed information and wind direction information, and the wind speed information and the wind direction information detected and output by the wind energy data detection equipment form an initial wind speed vector, and is characterized by further comprising a data processing unit, wherein the detection signal output end of the wind energy data detection equipment is in output connection with the data processing unit, the signal output end of the data processing unit is in output connection with the yaw subsystem, the data processing unit executes an error correction strategy, and the error correction strategy comprises the following implementation steps:
(1) carrying out orthogonal decomposition on an initial wind speed vector v output by detection of wind energy data detection equipment to obtain an initial wind speed axial vector vdAnd an initial wind speed tangent vector vqAxial vector v of initial wind speeddParallel to the normal of the plane of the wind wheel, and the initial wind speed tangent vector vqTangential parallel to the plane of the wind wheel;
(2) calculating a tangential velocity vector v of the wake at the wind energy data detection device according to the tangential induction factor of the wake of the wind turbine, the rotating speed of the wind turbine and the height of the wind energy data detection device relative to the center of the plane of the wind turbineqh；
(3) According to the initial wind speed tangent vector vqWith said tangential velocity vector vqhCalculating to obtain a corrected wind speed tangential vector vqsCutting the corrected wind speed into vector vqsAnd the initial wind speed axial vector vdSynthesizing to obtain corrected wind speed vector and wind direction of the corrected wind speed vector
And the yaw subsystem carries out yaw control according to the corrected wind speed vector obtained by the processing of the data processing unit.
14. The wind turbine system of claim 13, wherein the calculation of the tangential induction factor of the wind turbine wake comprises the steps of:
1) initializing an axial induction factor and a tangential induction factor to be zero;
2) calculating the inflow angleFormula for calculationComprises the following steps:
wherein a is an axial induction factor, a' is a tangential induction factor, h is the height of the wind energy data detection equipment relative to the plane center of the wind wheel, omega is the angular speed of the rotation of the wind wheel, v1The wind speed is in front of the plane where the wind wheel is located and the distance between the wind wheel and the plane where the wind wheel is located is larger than a set threshold value;
3) recalculating the axial induction factor and the tangential induction factor, wherein the calculation formula is as follows:
wherein, CxIs the axial moment coefficient of the wind wheel, CyThe tangential moment coefficient of the wind wheel; sigma is the blade solidity, namely the ratio of the chord length of the blade at the height position of the wind direction measuring point of the wind energy data detection equipment from the center of the hub of the fan to the circumference of the impeller;
4) comparing the axial induction factor obtained by the first calculation with the axial induction factor obtained by initialization, and the tangential induction factor obtained by the first calculation with the tangential induction factor obtained by initialization, if the error between the axial induction factor obtained by the first calculation and the axial induction factor obtained by initialization is larger than a first set error value, and/or the error between the tangential induction factor obtained by the first calculation and the tangential induction factor obtained by initialization is larger than a second set error value, recalculating the axial induction factor and the tangential induction factor according to the steps 2) and 3) by using the tangential induction factor obtained by the first calculation and the axial induction factor obtained by the first calculation as parameters, then calculating and comparing corresponding errors, if the error between the axial induction factor obtained by the second calculation and the axial induction factor obtained by the first calculation is larger than the first set error value, and/or the error between the tangential induction factor obtained by the second calculation and the tangential induction factor obtained by the first calculation is larger than a second set error value, the tangential induction factor obtained by the second calculation and the axial induction factor obtained by the second calculation are used as parameters, the axial induction factor and the tangential induction factor are recalculated again according to the steps 2) and 3), and the like until the error between the axial induction factor obtained by the certain calculation and the axial induction factor obtained last time is smaller than or equal to the first set error value, and the error between the tangential induction factor obtained by the certain calculation and the tangential induction factor obtained last time is smaller than or equal to the second set error value, so that the tangential induction factor obtained by the certain calculation is the required tangential induction factor.
15. Wind turbine system according to claim 13 or 14,
said tangential velocity vector vqhThe calculation formula of (2) is as follows:
vqh＝2a'Ωh
wherein a' is a tangential induction factor, h is the height of the wind energy data detection device relative to the plane center of the wind wheel, and Ω is the angular speed of the rotation of the wind wheel.
16. Wind turbine system according to claim 15,
the corrected wind speed tangent vector vqsThe calculation formula of (2) is as follows:
vqs＝vq-vqh
wherein v isqIs the initial wind speed tangential vector.
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| CN111706463B (en) * | 2020-05-21 | 2021-01-26 | 明阳智慧能源集团股份公司 | Yaw control method, device and unit of double-impeller floating type wind generating set |
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| 基于动力学耦合的风电机组载荷控制;周峰;《合中国优秀博士学位论文全文数据库工程科技Ⅱ辑》;20180131(第2018年第1期);正文第36-49页 * |
| 基于机舱激光雷达的风电机组偏航误差测量及修正;刘杰等;《风能产业》;20180501;第72-75页 * |
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|---|---|
| CN108691730A (en) | 2018-10-23 |
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