GB2067247A - A device for determining the wind energy in order to control wind generators - Google Patents

A device for determining the wind energy in order to control wind generators Download PDF

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Publication number
GB2067247A
GB2067247A GB8039853A GB8039853A GB2067247A GB 2067247 A GB2067247 A GB 2067247A GB 8039853 A GB8039853 A GB 8039853A GB 8039853 A GB8039853 A GB 8039853A GB 2067247 A GB2067247 A GB 2067247A
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United Kingdom
Prior art keywords
rotor
wind
blade
pressure
probes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8039853A
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GB2067247B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Erno Raumfahrttechnik GmbH
Original Assignee
Erno Raumfahrttechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Erno Raumfahrttechnik GmbH filed Critical Erno Raumfahrttechnik GmbH
Publication of GB2067247A publication Critical patent/GB2067247A/en
Application granted granted Critical
Publication of GB2067247B publication Critical patent/GB2067247B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0224—Adjusting blade pitch
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/74—Adjusting of angle of incidence or attack of rotating blades by turning around an axis perpendicular the rotor centre line
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/76—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism using auxiliary power sources
    • 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
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/78—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism driven or triggered by aerodynamic forces
    • 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
    • F05B2270/324—Air pressure
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)

Abstract

The device pressure probes (10) mounted at the surface of the rotor blades (4) near their nose portions (11), the sensed pressure differential acting to adjust the blade pitch or to align the rotor into the wind. Wind velocity may be calculated, e.g. by a computer, from the differential. <IMAGE>

Description

SPECIFICATION A device for determining the wind energy in order to control wind generators The invention relates to a device for ascertaining the wind energy in the rotor plane of wind generators, whose rotors are equipped with slim, aerodynamically-shaped rotor blades, and for controlling the wind energy in the rotor plane with the aid of a pressure difference measured by probes.
The rotor blades of a wind power system transforms the energy contained in the wind into shaft power and thus produce torques which have to be absorbed by the structure of the system. This conversion of energy is all the more useful and the torques all the smaller the more effectively the system can be controlled. The following components can be affected: the setting angle for the blade, the rotor speed, the drive output and, in the case of a horizontal rotor axis, the position of the plane of rotation of the rotor in relation to the air flow.
All of the control processes are based on the instant wind speed and the direction of the wind in the rotor plane. Therefore, it is very important to have very precise knowledge of the wind speed and wind direction at the rotor blades in order to achieve good control.
The methods of measurement, previously in common use for determining these values, produce large differences from the actual values, since they are ascertained with the aid of probes which are arranged either as close as possible to the rotor or at some distance therefrom on a speciai measurement mast. In the first instance errors in measurement are produced by the reaction of the rotor on the air flow; ideally, the rotor reduces the wind speed in its plane to approximately 1/3 and thus has a not inconsiderable effect on the flow immediately around the rotor. In the second instance, errors arise from lack of uniformity of the air flow, called gusts, which are produced chiefly by friction of the air with the ground and by thermal effects.The gusts are often localized to within such a small area that a wind speed measured by a mast itself located nearby may differ considerably from the speed in the rotor plane and therefore control errors arise. All of the previously known methods of measuring the wind are unsuitable for wind generators because they result in errors in control and therefore cause losses in the utilization of the wind energy produced and overloading of the structure of the wind-powered systems.
The invention seeks to provide a measuring device which is especially suitable for wind generators and in which the above mentioned errors are reduced or avoided.
According to the invention, there is provided a device for ascertaining the wind energy in the rotor plane of wind generators whose rotors are equipped with slim, aerodynamically shaped rotor blades, and for controlling the wind energy at the rotor plane with the aid of a pressure difference measured by probes, wherein the pressure probes are arranged at the surface of the rotor blades near their profiled nose or tip portions.
Pressure probes are therefore arranged at the surface of the rotor blades near the profiled nose or tip portion. In addition, a pressure probe for determining the total pressure may be arranged in front of the shaped nose or tip portion of the rotor blade. It is desirable for the probes to be arranged on the rotor blade at a point which is determined by the power characteristics of the rotor.
In order to achieve more accurate measurement, it is possible to take measurements at several points of the blade. A blade subdivided in the direction of its span width can be more accurately controlled in stages by means of this refined measurement.
Wind-powered systems having a device in accordance with the invention may be manufactured at lower cost than previous conventional systems which require a special measurement mast. The device may be used in all wind generators equipped with aerodynamicallyshaped, slim rotor blades. It improves the possibility of controlling the rotor for setting the blades and aligning the rotor in accordance with the wind.
The invention will now be described in greater detail, by way of example with reference to the drawings in which: Fig. 1 shows a part of a wind-powered system with a horizontal axis rotor; Fig. 2 shows a rotor blade of the system of Fig. 1; Fig. 3 shows a cross-section through the profiled nose or tip of a rotor blade (e.g. Fig. 2) with pressure probes in accordance with the invention; Fig. 4 shows a wind-powered system with a rotor having a horizontal axis and having a device in accordance with the invention; Fig. 5 shows a vertical axis rotor as seen from above, and Fig. 6 shows a further cross-section through a rotor blade (e.g. Fig. 2).
In Fig. 1 a part of a wind-powered system is shown with a carrier mast 1 and generally horizontal axis rotor 2, the axis being designated 3 and its adjustable, slim, aerodynamically shaped wing blades being designated 4.
The rotor 2 is mounted on the mast with a ring bearing 5 such that the rotor axis 3 can be pivoted about the vertical axis into the direction of the wind e.g. with the aid of a wind direction indicator 6 fixed to the axis 3. A controller 7 and adjusting device 8 operated by a controller are housed at the hub of the motor 2 for rotating the wing-type blades 4 about their longitudinal axis. Current supply slip rings 9 on the rotor axis are provided for the controller and the adjusting device.
In Fig. 2 and more particularly Fig. 3, the arrangement of pressure probes 10 in accordance with the invention is shown. The probes 10 are arranged on the surface of the wing-type blades 4 near the profiled nose or tip 11 on both sides of the centre plane 12, preferably at a spacing from the rotor axis 3 of 0.7 of the blade length. In Figs.
2 and 4, the location of the probes 10 is indicated by arrows and this location describes a so-called "measurement circle" during operation of the wind generator. The initial angle of the wind "a" (Fig. 6) can be deduced from the difference in pressure ascertained by the probes 10. If the setting angle "P" (Fig. 6) of the wing-type blade, the pressure difference at the measurement points and the rotary speed of the rotor are known, then the wind speed prevailing locally on the wing blade can be deduced from the measured values.
An example of the signal path of the pressure values picked up by the probes and transmitted to the control system is shown in Fig. 3. A current supply is designated 13, a coding device 14 and a measured value transfer from the rotor R to the stator S is designated 1 5.
With a multi-blade rotor with joint adjustment of the blades the measured values of all of the wing-type blades have to be ascertained, before the controller can ascertain the most favourable blade setting angle and then set the wing-type blades with the aid of the adjusting device.
With a rotor having individual blade setting, the controller can determine the most suitable setting angle for each wing-type blade with the aid of the measured values of the individual blade.
With a device in accordance with the invention, the wind energy in the rotor plane can be determined much more accurately than by conventional methods, such as a measurement mast, or an anemometer on the extended shaft of the rotor.
A Robinson's anemometer 16 (Fig. 4) only serves to control the system outside its actual operating range. Since an anemometer shows fairly small wind speeds more accurately than the pressure probes, the control device is switched advantageously to the anemometer when the wind drops or the rotor becomes stationary. Only when the operating speed is reached is the device switched over to wind measurement using pressure probes on the wing-type blade. It is possible to switch off the system during a storm of a predetermined seventy with the aid of measurement at the blades. In the case of a wind generator switched off because of a storm, only the anemometer is in operation.
The values of the initial angle of the wind ascertained by means of the pressure difference are passed to a computer. The computer determines the local wind speed with the aid of the known values of the setting angle and rotary speed. By also using the values for air pressure, temperature and the area of the rotor circle, the effective wind energy can be calculated in a further calculation process.
The alignment of the wind during operation can be controlled by means of pressure probe measurement at the wing-type blade as well as by using the wind indicator 6 in advantageous manner. If pressure probe measurement is used, the control system compares the inardent wind angles on a wing-type blade in the 900 and 2700 rotor position (Fig. 2). If both angles are equal, then it is not necessary to correct the alignment of the rotor plane in relation to the wind; if both angles are different, then the rotor plane must be pivoted until the two angles are equal again.
When setting individual blades and also when there are large local differences in the range of air flow, it is possible for unequal initial wind angles to arise. The wind alignment system just described would react advantageously by pivoting the rotor plane, until the rotor loading is as well balanced as possible.
If, in fact, the measuring system registers unequal initial wind angles at 900 and 2700 (Fig. 2), then the blades have to be adjusted in the 0 and 1 800 position so that the rotor plane pivots about the tower axis so as to balance the difference in the initial wind angles at 900 and 2700 again. With winds which increase with height, the large forces in the upper half of the rotor circle are reduced and the forces in the lower half are increased. This control is not only able to balance out to a large extent different loadings, but can also reduce bending forces acting on the rotor shaft.
If necessary, forces exciting (oscillation) can even be kept down. Overall, there is a reduction in structure loading so that lighter and therefore cheaper wind generators may be built.
While the alignment of the wind in relation to the rotor plane can be controlled during operation by a device in accordance with the invention, alignment with respect to the wind using a wind indicator is advantageous only when starting up the rotor. A rapidly reacting setting mechanism can be made much lighter and simpler in this case than the conventional mechanism, since the torques are smaller and the safety requirements lower.
As compared to the conditions with horizontal axis rotors (Figs. 1, 2 and 4) which have just been considered, vertical axis rotors (Fig. 5) have the following differences: the rotor does not require alignment with respect to the wind; the rotor blades 1 7 are subject to cyclic changes in the incident wind angle and each rotor blade enters the stream tube of the rotor twice; the air affected is not disrupted during the first pass (windward side); On the second pass (leeward side) the blade rushes through a decelerated and turbulent air flow.
The described method of measurement for the initial wind angle on the horizontal axis rotor (Figs.
3 and 6) operates without inertia and can also be used in vertical axis rotors. It is possible to deduce the prevailing wind speed from measurement of the initial wind speed as the blades pass through on the windward side if at the same time the rotary speed of the rotor is known. When the displacement of the blade is not controlled, exactly definable initial wind angles are provided for each rotor position for known ratios of vU/vO. It is possible to deduce the locally prevailing wind speed and thus the quantity of energy in the crosssection of the rotor immediately from the values of rotor speed and position and initial wind angle. In the case of rotors with controlled blade adjustment, it is necessary in addition to know the setting angle (P) (Fig. 6) as compared to a zero position in order to carry out this measurement.
In the case of air flow on the leeward side which is decelerated and turbulent, the initial wind angles at the rotor blade can no longer be accurately determined. Control is possible, however, because of the continuous measurement of the initial wind angle on the windward side.

Claims (7)

1. A device for ascertaining the wind energy in the rotor plane of wind generators, whose rotors are equipped with slim, aerodynamically shaped rotor blades, and for controlling the wind energy at the rotor plane with the aid of a pressure difference measured by probes, wherein the pressure probes are arranged at the surface of the rotor blade near their profiled nose or tip portions.
2. A device according to Claim 1 , wherein a pressure probe for ascertaining the total pressure is arranged before the profiled nose or tip portion.
3. A device according to Claim 1, wherein that the pressure probes are arranged at a spacing of 0.7 of the length of the blade from its rotor axis.
4. A device according to any one of Claims 1 to 3, wherein an anemometer is provided for the purpose of determining the range of application of the wind generator.
5. A device according to any one of Claims 1 to 4, wherein an anemoscope is provided on the rotor axis extended in a windward direction at a distance from the rotor plane of 0.2 to 0.5 of the blade length in order to align a rotor system with a horizontal axis in relation to the wind.
6. A device according to any one of Claims 1 to 5, wherein the rotor is aligned in relation to the wind with the aid of angular control of the blades.
7. A device for ascertaining the wind energy in the rotor plane of wind generators substantially as described herein with reference to the drawing.
GB8039853A 1980-01-10 1980-12-12 Device for determining the wind energy in order to control wind generators Expired GB2067247B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803000678 DE3000678A1 (en) 1980-01-10 1980-01-10 DEVICE FOR DETERMINING WIND ENERGY FOR CONTROLLING WIND POWER PLANTS

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GB2067247A true GB2067247A (en) 1981-07-22
GB2067247B GB2067247B (en) 1983-11-02

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DK (1) DK526780A (en)
FI (1) FI803851L (en)
GB (1) GB2067247B (en)
NO (1) NO803721L (en)
SE (1) SE8008017L (en)

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Publication number Priority date Publication date Assignee Title
US4474531A (en) * 1982-12-27 1984-10-02 U.S. Windpower, Inc. Windmill with direction-controlled feathering
US4648801A (en) * 1982-09-20 1987-03-10 James Howden & Company Limited Wind turbines
AT384657B (en) * 1985-05-20 1987-12-28 Thaller Heinrich Ing Rotational-speed regulating device for wind converters for the generation of electrical current
US4729716A (en) * 1986-02-25 1988-03-08 Montana Wind Turbine, Inc. Wind turbine
US4735552A (en) * 1985-10-04 1988-04-05 Watson William K Space frame wind turbine
US4815936A (en) * 1988-07-05 1989-03-28 United Technologies Corporation Wind turbine shutdown system
US4890976A (en) * 1987-11-25 1990-01-02 Peter Jansson Wind turbine
FR2748296A1 (en) * 1996-05-06 1997-11-07 Richer Bertrand Louis Isidore Control device for controlling setting of blades of wind turbine to reduce dynamic loading
WO1999005414A1 (en) * 1997-07-25 1999-02-04 Aloys Wobben Wind energy installation
DE10022129A1 (en) * 2000-05-06 2001-11-29 Aloys Wobben Operation of wind generator plant, slows or stops rotor when measurement from particle sensor exceeds given value.
WO2004092580A1 (en) * 2003-04-17 2004-10-28 New World Generation Inc. Wind turbine with friction drive power take off on outer rim
WO2005026537A1 (en) * 2003-09-10 2005-03-24 Mitsubishi Heavy Industries, Ltd. Blade pitch angle control device and wind turbine generator
JP2005188455A (en) * 2003-12-26 2005-07-14 Daiwa House Ind Co Ltd Propeller type wind power generation system
JP2005214066A (en) * 2004-01-29 2005-08-11 Fuji Heavy Ind Ltd Horizontal axis windmill and control method for horizontal axis windmill
US6940185B2 (en) 2003-04-10 2005-09-06 Advantek Llc Advanced aerodynamic control system for a high output wind turbine
WO2005093435A1 (en) * 2004-03-26 2005-10-06 Forskningscenter Risø Method and apparatus to determine the wind speed and direction experienced by a wind turbine
WO2006039903A1 (en) * 2004-10-09 2006-04-20 Igus - Innovative Technische Systeme Gmbh Method and device for controlling the pitch angles of the rotor blades of wind power stations
CN100385111C (en) * 2003-09-10 2008-04-30 三菱重工业株式会社 Blade pitch angle control device and wind turbine generator
EP2017468A1 (en) 2007-07-20 2009-01-21 Siemens Aktiengesellschaft Method for wind turbine yaw control
EP2056210A2 (en) * 2007-10-30 2009-05-06 General Electric Company Method of controlling a wind energy system and wind speed sensor free wind energy system
WO2009109655A1 (en) * 2008-03-07 2009-09-11 Vestas Wind Systems A/S A control system and a method for controlling a wind turbine
EP2108830A2 (en) 2008-01-10 2009-10-14 Siemens Aktiengesellschaft Method for determining fatigue load of a wind turbine and for fatigue load control, and wind turbines therefor
EP2133564A2 (en) * 2008-06-13 2009-12-16 General Electric Company System for the monitoring of the wind incidence angle and the control of the wind turbine
US20090311096A1 (en) * 2008-06-13 2009-12-17 Stefan Herr Method and apparatus for measuring air flow condition at a wind turbine blade
EP2148088A1 (en) 2008-07-22 2010-01-27 Siemens Aktiengesellschaft Method and arrangement to adjust the pitch of wind turbine blades
EP2180183A1 (en) * 2008-10-23 2010-04-28 Siemens Aktiengesellschaft Stall detection by use of pressure sensors
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CN102900609A (en) * 2012-10-26 2013-01-30 华北电力大学 Giant magnetostrictive flap wind turbine blade vibration reduction system and control method
ITRM20110516A1 (en) * 2011-09-30 2013-03-31 Enel Green Power Spa HORIZONTAL AXIS WIND GENERATOR WITH SECONDARY WIND ROTOR
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US8786117B2 (en) 2008-06-13 2014-07-22 General Electric Company Wind turbine sensor assembly and method of assembling the same
US8807940B2 (en) 2007-01-05 2014-08-19 Lm Glasfiber A/S Wind turbine blade with lift-regulating means in form of slots or holes
JP2014181706A (en) * 2013-03-15 2014-09-29 Frontier Wind Llc Determination on load using positions of various sensors
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CN102177341B (en) * 2008-10-24 2014-12-31 流体远洋有限公司 A floatable wind power plant
EP1505299B1 (en) * 2003-08-07 2017-02-22 Hitachi, Ltd. Method for yawing horizontal axis wind turbine
EP2778405A3 (en) * 2013-03-15 2018-03-14 Frontier Wind, LLC Load distribution estimation for wind turbine blade
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DE19832207A1 (en) * 1998-07-17 2000-01-27 Rolf Hoffmann Determining wind speed communicated across rotor of wind power plant using rotor torque and windspeed and alteration of torque by disturbance of windflow through tower of wind plant
DE10232021B4 (en) * 2002-07-16 2016-05-04 Markus Jansen Method for predicting gusts of wind and the associated control of wind turbines and wind power plant for carrying out this method
DE102007015179A1 (en) 2007-03-29 2008-10-02 Siemens Ag Pressure measuring device and method for determining wind power on wind turbines and use of the pressure measuring device and the method
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CN105863952A (en) * 2016-05-16 2016-08-17 北京玻钢院复合材料有限公司 Flow guide hood, impeller assembly and wind power generation device

Cited By (98)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4648801A (en) * 1982-09-20 1987-03-10 James Howden & Company Limited Wind turbines
US4474531A (en) * 1982-12-27 1984-10-02 U.S. Windpower, Inc. Windmill with direction-controlled feathering
AT384657B (en) * 1985-05-20 1987-12-28 Thaller Heinrich Ing Rotational-speed regulating device for wind converters for the generation of electrical current
US4735552A (en) * 1985-10-04 1988-04-05 Watson William K Space frame wind turbine
US4729716A (en) * 1986-02-25 1988-03-08 Montana Wind Turbine, Inc. Wind turbine
US4890976A (en) * 1987-11-25 1990-01-02 Peter Jansson Wind turbine
US4815936A (en) * 1988-07-05 1989-03-28 United Technologies Corporation Wind turbine shutdown system
FR2748296A1 (en) * 1996-05-06 1997-11-07 Richer Bertrand Louis Isidore Control device for controlling setting of blades of wind turbine to reduce dynamic loading
WO1999005414A1 (en) * 1997-07-25 1999-02-04 Aloys Wobben Wind energy installation
AU727051B2 (en) * 1997-07-25 2000-11-30 Aloys Wobben Wind energy installation
US6361275B1 (en) 1997-07-25 2002-03-26 Aloys Wobben Wind energy installation
EP1243790A1 (en) * 1997-07-25 2002-09-25 Aloys Wobben Wind turbine
EP1544458A3 (en) * 1997-07-25 2006-12-20 Aloys Wobben Blade pitch angle control for wind turbine
EP1544458A2 (en) * 1997-07-25 2005-06-22 Aloys Wobben Blade pitch angle control for wind turbine
DE10022129A1 (en) * 2000-05-06 2001-11-29 Aloys Wobben Operation of wind generator plant, slows or stops rotor when measurement from particle sensor exceeds given value.
DE10022129C2 (en) * 2000-05-06 2002-04-18 Aloys Wobben Method for operating a wind energy installation and wind energy installation for carrying out the method
US6940185B2 (en) 2003-04-10 2005-09-06 Advantek Llc Advanced aerodynamic control system for a high output wind turbine
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DK526780A (en) 1981-07-11
DE3000678A1 (en) 1981-07-16
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FI803851L (en) 1981-07-11
NO803721L (en) 1981-07-13

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