CN103711642B - For determining the system and method for wind turbine operational factor - Google Patents
For determining the system and method for wind turbine operational factor Download PDFInfo
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- CN103711642B CN103711642B CN201210370428.6A CN201210370428A CN103711642B CN 103711642 B CN103711642 B CN 103711642B CN 201210370428 A CN201210370428 A CN 201210370428A CN 103711642 B CN103711642 B CN 103711642B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012545 processing Methods 0.000 claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000000418 atomic force spectrum Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
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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
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Abstract
The present invention relates to a kind of system and method for determining wind turbine operational factor.This system includes pressure transducer and processing unit.This pressure transducer is arranged on wind turbine and senses blast and produce wind pressure signal.This processing unit receives and processes described wind pressure signal to obtain wind speed profile.Further, described wind speed profile and the physical parameter having previously been stored in its interior described wind turbine can be processed by this processing unit, thus obtain the operational factor of described wind turbine.
Description
Technical field
The present invention relates to one can be used for determining wind turbine (Wind Turbine) operational factor
The system and method for (Operating Parameters), particularly relates to one and can be used for determining that wind turbine exists
The system and method for the operational factor under real wind field.
Background technology
Along with the continuous concern to environmental and climatic changes, wind turbine has been widely used and has kept watch
The available energy of other forms, such as electric energy can be changed into.Particularly, wind turbine is provided with blade,
It can flutter the kinetic energy catching wind-force, and is changed into electric energy by the kinetic energy of its turning handle wind-force.
Generally, under certain wind load (Wind Load), wind turbine be often designed to have
Series of theories parameter, such as, the blade of wind turbine is designed to have corresponding theoretical deflection
Curve (Deflection Curves).But, in real wind field, the service condition of wind turbine is
Changeable and complicated.It is therefore necessary to determine the operational factor of wind turbine, so can not only lead to
Cross real wind field data to verify the design of wind turbine, and can be at wind turbine running
In its health status is estimated.
The operational factor of wind turbine can include wind speed (Wind Speed), the deflection (Blade of blade
Deflection), the moment of flexure (Bending Moment) of blade, the asymmtric load of wind turbine rotor
(Asymmetric Load), thrust (Thrust), driftage (Yaw), spinner velocity (Rotor Speed), generating
Motor speed (Generator Speed), structural vibration (Structural Vibration) etc..
At present, there have been some operational factors attempting determining wind turbine, such as at wind turbine
Sensor is installed on machine its operational factor is determined.But, owing to different sensors has not
Same characteristic, will determine that different operational factors is accomplished by installing different sensors, thus increase
The difficulty that wind turbine is installed and safeguarded.And, even if being provided with multiple sensor, it can not
All operational factors are determined.
It is therefore desirable to provide a kind of new system and method for determining wind turbine operational factor.
Summary of the invention
An embodiment provides a kind of system for determining wind turbine operational factor.
This system includes pressure transducer and processing unit.This pressure transducer is arranged on wind turbine to be felt
Survey blast and produce wind pressure signal.This processing unit receives and processes described wind pressure signal to obtain wind speed wheel
Wide.Further, this processing unit can be to described wind speed profile and have previously been stored in its interior described wind-force
The physical parameter of turbine processes, thus obtains the operational factor of described wind turbine.
Another embodiment of the present invention provides a kind of method for determining wind turbine operational factor.
The method includes utilizing the pressure transducer being arranged on wind turbine to sense blast to produce blast letter
Number；Process to obtain wind speed profile to described wind pressure signal；And utilize processing unit to described wind speed
The physical parameter of profile and predetermined wind turbine carries out processing to determine described operational factor.
Accompanying drawing explanation
By combining accompanying drawing, embodiments of the invention are described, the present invention be may be better understood,
In the accompanying drawings:
Fig. 1 is the wind turbine of the system being provided with the present invention for determining wind turbine operational factor
The schematic diagram of an embodiment；
Fig. 2 is the side schematic view of one embodiment of wind turbine shown in Fig. 1；
Fig. 3 is that the present invention is for determining the signal of an embodiment of the system of wind turbine operational factor
Figure；And
Fig. 4 is that the present invention is for determining the flow process of an embodiment of the method for wind turbine operational factor
Schematic diagram.
Detailed description of the invention
The detailed description of the invention of the present invention explained below, it should be pointed out that at these embodiments
During specific descriptions, in order to carry out brief and concise description, this specification can not be to actual enforcement
All features of mode all make detailed description.It is to be understood that at any one embodiment
Actual implementation process in, as during any one engineering project or design object, in order to
Realize the objectives of developer, in order to meet the restriction that system is relevant or business is relevant, usually can
Make various concrete decision-making, and this also can be from a kind of embodiment to another embodiment
Change.Although moreover, it is to be understood that effort done in this development process may
It is complicated and tediously long, but for the ordinary skill of this area relevant to present disclosure
For personnel, some designs carried out on the basis of the technology contents that the disclosure discloses, manufacture or raw
The changes such as product simply conventional technique means, are not construed as content of this disclosure insufficient.
Unless otherwise defined, the technical term used in claims and description or scientific terminology should
In by the technical field of the invention, there is the ordinary meaning that the personage of general technical ability is understood.The present invention
" first ", " second " and the similar word used in patent application specification and claims
It is not offered as any order, quantity or importance, and is used only to distinguish different ingredients." one
Individual " or the similar word such as " " be not offered as quantity and limit, but represent and there is at least one." bag
Include " or the similar word such as " comprising " mean to occur in " including " or " comprising " before unit
Part or object contain occur in " including " or the element of " comprising " presented hereinafter or object and
Equivalent element, it is not excluded that other elements or object." connect " or word that " being connected " etc. is similar
It is not limited to physics or machinery connection, is also not necessarily limited to direct or indirectly connects.
Fig. 1 show the wind-force of the system 11 being provided with the present invention for determining wind turbine operational factor
The schematic diagram of one embodiment of turbine 10.Fig. 2 show the wind turbine 10 shown in Fig. 1
The side schematic view of an embodiment.As depicted in figs. 1 and 2, wind turbine 10 includes pylon
(Tower) cabin (Nacelle) 13 and the rotor (Rotor) 14 of pylon 12 upper end 12, it are arranged on.Pylon 12
Self-supporting device 100, as ground or platform upwardly extend, it has suitable height and shape and at machine
Between cabin 13 and support means 100, definition has cavity (not shown).Rotor 14 is provided with rotating wheel hub
15 and at least one blade 16.Rotating wheel hub 15 docks with cabin 13 phase, and blade 16 is arranged on
Stretch out on wheel hub 15 and from this wheel hub 15.
In the embodiment shown in Fig. 1 and Fig. 2, wind turbine 10 is provided with plurality of vanes 16,
Such as three blades.Blade 16 arranges round wheel hub 15 and is spaced a certain distance, so,
Blade 16 just can rotate along with the rotation of the wheel hub 15 of rotor 14, thus captures the kinetic energy of wind-force
(Kinetic Energy) is also transformed into the energy of other forms, such as electric energy by this kinetic energy of turning handle.
In certain embodiments, the length of each blade 16 can be in the range of 15 meters to 91 meters.
In further embodiments, each blade 16 has other suitable length to capture the kinetic energy of wind-force.
So, in wind turbine 10 operation process, wind-force can impact blade 16, rotor along direction 17
14 carry out rotating along rotary shaft 102 thus band moving vane 16 rotates and captures and transmit wind energy.
In the present embodiment, although wind turbine 12 is horizontal axis wind turbine (Horizontal Axis
Wind Turbine), in other examples, wind turbine 12 is alternatively vertical axis wind turbine
(Vertical Axis Wind Turbine).For convenience of description, some elements of wind turbine 12 are not schemed
Show.
In one embodiment, in the operation process of wind turbine 10, blade 16 can be by wind load
Or the impact of the impact of other strength, such as centrifugal force, this just may result in blade 16 and deflects and make it
Inflection point is deflected into from neutral or non-deflected posi-tion.Therefore, steady in order to ensure wind turbine 10 safety
Fixed operation, it is therefore necessary to the operational factor of wind turbine is determined or monitors, thus assesses
The field data that the health status of wind turbine 10 and utilization monitoring obtain is to verify wind turbine
Design.The most so-called " operational factor " can include wind turbine parameter in running, also
Parameter when it remains static can be referred to.
In non-restrictive example, the operational factor of wind turbine can include wind speed (Wind Speed), blade
Deflection (Blade Deflection), the moment of flexure (Bending Moment) of blade, the rotating speed (Rotating of blade
Speed), the asymmtric load (Asymmetric Load) of rotor, thrust (Thrust), driftage (Yaw), turn
Sub-speed (Rotor Speed), alternator speed (Generator Speed), structural vibration (Structural
Vibration).In certain example, present system 11 can be to all operations of wind turbine 10
Parameter is determined or monitors.
Fig. 3 show the present invention for determining a reality of the system 11 of wind turbine 10 operational factor
Execute the schematic diagram of example.As shown in Fig. 1 to Fig. 3, system 11 includes pressure transducer 18, processing unit
19 and supervising device 20.
In the present embodiment, pressure transducer 18 is arranged on wind turbine 10, and it can be used for wind
Pressure carries out sensing and produce wind pressure signal and is easy to wind speed profile (Wind Profile) or the distribution of wind speed
(Wind Speed Distribution) is determined.In embodiments of the present invention, pressure transducer 18 can wrap
Include absolute pressure transducer and/or differential pressure pick-up.In a non-restrictive example, pressure transducer 18
Including differential pressure pick-up.Wind speed profile can include air speed data.
In the present embodiment, pressure transducer 18 is arranged on pylon 12, wheel hub 15 and blade 16
Measure the wind speed profile of diverse location.In this example, it is provided with five pressure transducers 18, thus tower
It is respectively arranged with one on frame 12, wheel hub 15 and three blades 16.Five pressure transducers 18 are separately positioned on
On the middle part 21,22 of corresponding blade 16 and pylon 12 and on the central part (mark) of wheel hub 15.This
Locate so-called middle part can finger element along the zone line laterally or longitudinally on its length direction.So-called
Central part can the central area of circumference of finger wheel hub 15.
In other embodiments, pylon 12, each in wheel hub 15 and three blades 16 all can set
Put more than one pressure transducer 18.In certain example, on pylon 13 and three blades 16
The more than one pressure transducer arranged can be arranged along its length direction.
Such as, the top 23 of each blade 16, middle part 22 and bottom 24 are disposed with three
Individual pressure transducer 18.The most so-called " end " can the end regions of finger element.Top 23 is arranged on
On the free end of blade 16, wheel hub 15 is closed in bottom 24.In certain application, can be along wheel hub 15
Circumference more than one pressure transducer 18 is set.Based on specific application, pressure transducer 18 can
It is arranged on any suitable position on pylon 12, wheel hub 15 and blade 16.
In some instances, can be at pylon 12, or in wheel hub 15 and three blades 16
Pressure transducer 18 it is provided with on above.Although being provided with multiple pressure transducer 18 in the present embodiment,
In specific example, it is possible to a pressure transducer 18 is only set and senses.Such as, at wheel hub
The middle part of the central part of 15 or one of them blade 16 arranges this pressure transducer 18.
In non-restrictive example, pressure transducer 18 is exposed to impact wind turbine 10, such as blade
In the wind of 16, in order to measure blast.In some applications, pressure transducer 18 is arranged on wind-force whirlpool
On the outer surface 101 of turbine 10, it is towards the wind of impact wind turbine 10.In certain application,
Pressure transducer 18 may also be arranged on the inner surface of wind turbine 10 and is exposed in wind.
Processing unit 19 can be used for receiving and processing from being positioned at the pressure of desired locations on wind turbine 19
The wind pressure signal of force transducer 18, so that it is determined that wind speed profile.Such as, pressure transducer 18 monitors
Total blast Pt and static air pressure Ps, and it is transferred to processing unit 19 processes.Processing unit 19
According to formula V2=2 (Pt-Ps)/ρ thus obtain the wind speed V of diverse location.Herein, ρ can refer to wind density (Wind
Density), it can be determined according to the sensing of pressure transducer 18.Further, processing unit 19
The physical parameter of the wind-force profile obtained and the wind turbine predefining and setting within it can be carried out
Analyzing and processing determines the operational factor of wind turbine.
In certain embodiments, processing means 19 is not limited to any specifically can be used to and performs place of the present invention
The processing means of reason task.In embodiments of the present invention, processing means can represent any and can carry out computing
Or calculate, it is necessary device for performing the task of the present invention.As skilled in the art to understand
, processing means also can represent any and be able to receive that input this input of rule treatments according to regulation, from
And produce the device of output.
As it is shown on figure 3, in non-restrictive example, processing unit 19 can include for receive and process from
The wind pressure signal of pressure transducer 18 is to determine the first module 25 of wind speed profile and to store predetermined
Second module 26 of the physical parameter of wind turbine 10.Generally, manufactured when a wind turbine
After going out, its physical parameter just can be determined.This physical parameter may include but be not limited to material parameter,
Aerodynamic parameter and geometric parameter.This geometric parameter can include the width of such as shape, length, blade
Degree and blade pitch etc..
In the present embodiment, processing unit 19 can farther include processing module 27, and it can receive and locate
The reason wind speed profile from the first module 25 and the physical parameter from the second module 26, thus determine
The operational factor of wind turbine 10.Such as, processing module 27 is to from blade 16 diverse location
Wind-force profile and the physical parameter of this blade be analyzed, thus obtain real-time corresponding at blade 16
The blade deflection information of position.Contrast based on the deflection information at blade diverse location, this blade 16 phase
Positional information for pylon 12 just can be determined.
In other examples, processing module 27 can be to from the wind speed profile of wheel hub 15 and wind turbine
Physical parameter be analyzed, thus obtain the wheel hub 15 deviation (Deviation) relative to rotary shaft 102
Information, this contributes to being monitored the running status of wind turbine 10.
In certain embodiments, processing module 27 can include wind turbine modeling program, and it can be based on
Analysis to wind-force profile and wind turbine physical parameter determines the operational factor of wind turbine.?
In non-restrictive example, processing module 27 can include that FEM (finite element) model program carrys out real-time acquisition operational factor.
Such as, in the processing procedure of processing unit 19, FEM (finite element) model program utilizes Runge-Kutta-how
Si Telangfa (Runge-Kutta-Nystrom method) is to the motion that have input wind-force profile and physical parameter
Kinetics equation solves, thus obtains operational factor.In one example, this kinematics side
Journey can be based on the kinetics beam steering model of the lateral deflection (Transverse Deflection) for blade
(Dynamic Beam-bending Model) and obtain.Based on different application, processing unit 19 can make
The real-time operational factor obtaining wind turbine is carried out with other kinematics equation.
Supervising device 20 is connected with processing unit 19, and it can include display device, as liquid crystal display fills
Put and show analysis result, it is simple to user is observed.It addition, may also set up control device (not shown),
It can be connected with processing unit 19, thus receive from processing unit 19 determination operational factor with
It is easy to wind turbine 10 is controlled.Embodiment shown in Fig. 1 to Fig. 3 is only illustrative, the
One and second module 25,26 individually can arrange or integrally disposed with processing module 27.
Fig. 4 show the present invention for determining an enforcement of the method 28 of wind turbine 10 operational factor
The schematic flow sheet of example.As shown in Figure 4, when operation, in step 29, pressure transducer is utilized
18 sense blast and produce wind pressure signal.Then, in step 30, wind pressure signal is analyzed
To obtain wind speed profile.Subsequently, in step 31, to wind speed profile and the physical parameter of wind turbine
It is analyzed processing so that it is determined that the operational factor of this wind turbine.In non-restrictive example, step 30
All can carry out in processing unit 19 with 31.
In embodiments of the present invention, system 11 is provided with pressure transducer 18 and processing unit 19 determines
The operational factor of wind turbine 10, this contributes to guaranteeing the operation that wind turbine safety is stable.Passing
In system system, owing to not having real wind field data, processing unit 19 is commonly used to the fortune to wind turbine
Line parameter is simulated.But, the data that this simulation obtains are generally not capable of reacting accurately actual motion
In operational factor.In present system 11, due to the use of pressure transducer 18, just can be accurately
The real-time wind-force profile obtained in actual wind field, this is for obtaining the operation of wind turbine accurately
Parameter is highly beneficial.Meanwhile, by the process of processing unit 19, present system 11 can be to wind-force whirlpool
All operational factors of turbine 10 are determined or monitor.
Although describing the present invention in conjunction with the specific embodiments, but those skilled in the art is permissible
Understand, the present invention be may be made that many amendments and modification.It is therefore contemplated that, claims
It is intended to cover all such modifications in true spirit of the present invention and scope and modification.
Claims (19)
1. a system for the wind turbine operational factor for determining, including:
Pressure transducer, it is arranged on wind turbine and senses blast and produce wind pressure signal；And
Processing unit, it receives and processes described wind pressure signal to obtain wind speed profile, and this processing unit enters
Described wind speed profile and the physical parameter having previously been stored in its interior described wind turbine can be carried out by one step
Process, thus obtain the operational factor of described wind turbine.
2. the system as claimed in claim 1, wherein said wind turbine includes pylon, is arranged on institute
State the cabin on pylon, the rotating wheel hub being connected with described cabin, and with answering that described wheel hub connects
Several blades, described pressure transducer is arranged in described plurality of vanes, described pylon and described wheel hub
At least one on.
3. system as claimed in claim 2, the middle part of blade described in each of which is provided with one
Described pressure transducer.
4. system as claimed in claim 2, the central part of wherein said wheel hub is provided with a described pressure
Force transducer.
5. system as claimed in claim 2, the middle part of wherein said pylon is provided with a described pressure
Sensor.
6. system as claimed in claim 2, wherein said pressure transducer is arranged on towards described in wind
On the outer surface of wind turbine.
7. system as claimed in claim 2, wherein said pressure transducer includes differential pressure pick-up.
8. the system as claimed in claim 1, wherein said wind speed profile includes air speed data.
9. the system as claimed in claim 1, wherein said processing unit includes processing module, and it can connect
Receive and process described wind speed profile and described physical parameter to determine the operational factor of described wind turbine.
10. system as claimed in claim 9, wherein said processing module includes FEM (finite element) model.
11. systems as claimed in claim 9, wherein said processing unit farther includes to receive and locate
Manage described wind pressure signal to produce the first module of described wind speed profile and to store the of described physical parameter
Two modules.
12. the system as claimed in claim 1, wherein said operational factor include wind speed, the deflection of blade,
The moment of flexure of blade, the rotating speed of blade, the asymmtric load of rotor, thrust, driftage, spinner velocity, send out
One or more in motor speed and structural vibration.
13. 1 kinds are used for the method determining wind turbine operational factor, including:
Utilize the pressure transducer being arranged on wind turbine to sense blast to produce wind pressure signal；
Process to obtain wind speed profile to described wind pressure signal；And
Utilize processing unit that the physical parameter of described wind speed profile and predetermined wind turbine is carried out
Process to determine described operational factor.
14. methods as claimed in claim 13, wherein the process to described wind pressure signal is in described process
Carrying out in unit, described pressure transducer includes differential pressure pick-up.
15. methods as claimed in claim 13, wherein said wind speed profile includes air speed data.
16. methods as claimed in claim 13, wherein said operational factor include wind speed, the deflection of blade,
The moment of flexure of blade, the rotating speed of blade, the asymmtric load of rotor, thrust, driftage, spinner velocity, send out
One or more in motor speed and structural vibration.
17. methods as claimed in claim 13, wherein said processing unit includes processing module, described place
Reason module includes FEM (finite element) model, and it can receive and process described wind speed profile and described physical parameter.
18. methods as claimed in claim 13, described pressure transducer towards and be exposed to impact described wind
The wind of power turbine senses blast.
19. methods as claimed in claim 18, wherein said pressure transducer is arranged on described wind turbine
On the outer surface of machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210370428.6A CN103711642B (en) | 2012-09-28 | 2012-09-28 | For determining the system and method for wind turbine operational factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210370428.6A CN103711642B (en) | 2012-09-28 | 2012-09-28 | For determining the system and method for wind turbine operational factor |
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| CN103711642A CN103711642A (en) | 2014-04-09 |
| CN103711642B true CN103711642B (en) | 2016-08-24 |
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| CN201210370428.6A Active CN103711642B (en) | 2012-09-28 | 2012-09-28 | For determining the system and method for wind turbine operational factor |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105089931A (en) | 2014-05-13 | 2015-11-25 | 通用电气公司 | Draught fan and alignment method for draught fan blades |
| DE102015209109A1 (en) * | 2015-05-19 | 2016-11-24 | Wobben Properties Gmbh | Measuring arrangement on a wind turbine |
| KR101678005B1 (en) * | 2015-08-28 | 2016-11-22 | 동국대학교 산학협력단 | An apparatus for measuring wind velocity |
| US10738762B2 (en) | 2016-04-08 | 2020-08-11 | Vestas Wind Systems A/S | Method and system for controlling a wind turbine to manage edgewise blade vibrations |
| DE102016117191A1 (en) * | 2016-09-13 | 2018-03-15 | fos4X GmbH | Method and device for determining loads on a tower of a wind energy plant |
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| WO2002057800A1 (en) * | 2001-01-22 | 2002-07-25 | Sociedad Anónima De Instalaciones De Control | Flexure air speed indicator and vane |
| US6619918B1 (en) * | 1999-11-03 | 2003-09-16 | Vestas Wind Systems A/S | Method of controlling the operation of a wind turbine and wind turbine for use in said method |
| DE102004057320A1 (en) * | 2004-11-27 | 2006-06-01 | Karl-Heinz Best | Device for monitoring a wind energy installation comprises a data acquisition unit having a load sensor to detect the load operation of the installation and a wind sensor |
| CN101603500A (en) * | 2008-06-13 | 2009-12-16 | 通用电气公司 | Be used to measure the method and apparatus of the air flow condition at wind turbine blade place |
| WO2010046403A2 (en) * | 2008-10-23 | 2010-04-29 | Vestas Wind Systems A/S | A wind turbine and a method for monitoring a wind turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090232635A1 (en) * | 2008-03-12 | 2009-09-17 | General Electric Company | Independent sensing system for wind turbines |
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| US6619918B1 (en) * | 1999-11-03 | 2003-09-16 | Vestas Wind Systems A/S | Method of controlling the operation of a wind turbine and wind turbine for use in said method |
| WO2002057800A1 (en) * | 2001-01-22 | 2002-07-25 | Sociedad Anónima De Instalaciones De Control | Flexure air speed indicator and vane |
| DE102004057320A1 (en) * | 2004-11-27 | 2006-06-01 | Karl-Heinz Best | Device for monitoring a wind energy installation comprises a data acquisition unit having a load sensor to detect the load operation of the installation and a wind sensor |
| CN101603500A (en) * | 2008-06-13 | 2009-12-16 | 通用电气公司 | Be used to measure the method and apparatus of the air flow condition at wind turbine blade place |
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