WO2005090781A1 - A method for reduction of axial power variations of a wind power plant - Google Patents

A method for reduction of axial power variations of a wind power plant Download PDF

Info

Publication number
WO2005090781A1
WO2005090781A1 PCT/NO2005/000096 NO2005000096W WO2005090781A1 WO 2005090781 A1 WO2005090781 A1 WO 2005090781A1 NO 2005000096 W NO2005000096 W NO 2005000096W WO 2005090781 A1 WO2005090781 A1 WO 2005090781A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
wind
blades
pitch
axial force
Prior art date
Application number
PCT/NO2005/000096
Other languages
English (en)
French (fr)
Inventor
Eystein Borgen
Original Assignee
Sway As
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 Sway As filed Critical Sway As
Priority to JP2007504903A priority Critical patent/JP5006186B2/ja
Priority to KR1020067020476A priority patent/KR101145255B1/ko
Priority to AU2005224580A priority patent/AU2005224580B2/en
Priority to US10/599,109 priority patent/US20070212209A1/en
Priority to CA2564635A priority patent/CA2564635C/en
Priority to EP05731806A priority patent/EP1738073A1/en
Publication of WO2005090781A1 publication Critical patent/WO2005090781A1/en
Priority to NO20064791A priority patent/NO342746B1/no

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors 
    • F03D7/02Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0204Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor for orientation in relation to wind direction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors 
    • F03D7/02Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022Adjusting aerodynamic properties of the blades
    • F03D7/0224Adjusting blade pitch
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors 
    • F03D7/02Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022Adjusting aerodynamic properties of the blades
    • F03D7/024Adjusting aerodynamic properties of the blades of individual blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors 
    • F03D7/02Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0276Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors 
    • F03D7/02Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
    • F03D7/0292Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power to reduce fatigue
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors 
    • F03D7/02Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04Automatic control; Regulation
    • F03D7/042Automatic control; Regulation by means of an electrical or electronic controller
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00Components
    • F05B2240/90Mounting on supporting structures or systems
    • F05B2240/93Mounting on supporting structures or systems on a structure floating on a liquid surface
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00Components
    • F05B2240/90Mounting on supporting structures or systems
    • F05B2240/95Mounting on supporting structures or systems offshore
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00Function
    • F05B2260/82Forecasts
    • F05B2260/821Parameter estimation or prediction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/10Purpose of the control system
    • F05B2270/1016Purpose of the control system in variable speed operation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/10Purpose of the control system
    • F05B2270/109Purpose of the control system to prolong engine life
    • F05B2270/1095Purpose of the control system to prolong engine life by limiting mechanical stresses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/30Control parameters, e.g. input parameters
    • F05B2270/321Wind directions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/30Control parameters, e.g. input parameters
    • F05B2270/327Rotor or generator speeds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/30Control parameters, e.g. input parameters
    • F05B2270/331Mechanical loads
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/40Type of control system
    • F05B2270/404Type of control system active, predictive, or anticipative
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00Control
    • F05B2270/80Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05B2270/808Strain gauges; Load cells
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/727Offshore wind turbines

Definitions

  • This invention relates to a method for adjusting the angle of the rotor blades about their own longitudinal axis in a wind power plant in such manner that the thrust of the rotor on the tower is controlled and kept within desired values without the average output of the wind power plant being affected to any noticeable degree.
  • This has the advantage that the load variations on the rotor blade and tower are reduced, thereby substantially reducing fatigue of these heavily loaded components.
  • Momentary wind velocity is defined as the momentary wind velocity that is measured at a particular point in time.
  • Average or levelled wind velocity is defined as the average or approximately the average of the momentary wind velocity for a certain period. This period will typically be longer than three seconds and normally in the range of 10 minutes to one hour, but it can also be longer. When the wind velocity is used to control the wind turbine, scaling or fractions of such measured values will also be covered by this definition.
  • Pitch angle in this patent application is defined as the rigid body torsion of a rotor blade about its own longitudinal axis relative to a fixed starting position for this angle. By pitching the blades, the forces on the rotor for a given momentary wind velocity can be varied.
  • Rotor axial force is defined as the thrust that is transferred from the rotor towards the mill housing and which is directed essentially along the rotational axis of the rotor axis. This force consists of the total thrust in the wind direction from the rotor blades and may be both positive and negative at different times during the operation of the wind power plant.
  • Nominal wind velocity is defined as the wind velocity at which the wind power plant first achieves full output. This may typically be in the range of 12-14 m/s.
  • Converter unit is the unit which generates or converts energy from the wind/rotation of the rotor blades into electric power or other mechanical power.
  • This unit may typically be a generator, a mechanical pump, a gear unit or the like.
  • generator is used for the most part, but it is clear that generator can be replaced by any type of suitable converter unit as mentioned here.
  • a floating structure of this kind will primarily be affected by two types of forces that will control the motion pattern and stresses on the floating structure. These are waves forces against the floating part of the structure and thrust on the rotor from the wind, referred to herein as the rotor axial force.
  • the dominant forces acting on the structure will usually be, in addition to gravitational forces, the thrust on the rotor from the wind.
  • the rotor provides a constant output power, equal to the nominal output of the plant, for wind velocities that are higher than necessary in order to achieve full output (nominal output).
  • One of the methods is stall regulation of the rotor blades. This method turns the blades into the wind so that the angle of attack of the relative wind against the wing profile is increased and the rotor blades reach stall.
  • the other regulating method is pitch regulation of the blades whereby the blades are turned in the opposite direction to that in stall regulation so that the wind is released by reducing the angle of attack of the relative wind against the wing profile.
  • pitch regulation is a last regulating method which is called pitch regulation in this application.
  • the rotor rpm for wind velocities above the nominal wind velocity will be regulated so that the rotor output which is equal to the rotor torque multiplied by the angular speed (rotational speed in radians) is kept as constantly equal to the nominal output of the wind power plant as possible.
  • a control unit controls the pitch angle of the rotor blades continuously.
  • Output and rotor axial force are non-linear values as a function of variation of the wind velocity.
  • the rotor axial force may thus have large variations. These force variations cause major fatigue loads on the blades and tower structure, which in many cases can be dimensioning for these structural elements.
  • the above-described effect that increased wind velocity reduces the rotor axial force because of the pitch regulation may also have negative effects on the motion pattern of the wind power plant.
  • the relative wind velocity against the rotor will increase, which will result in a reduced rotor thrust because the pitch regulation tries to maintain constant output, which in turn will increase the movement of the tower against the wind.
  • Patent No. US-4201514 describes a method for regulating the pitch angle of the individual rotor blades in relation to variations of the wind velocity. .
  • the regulation describes how the torque of the individual blades about the rotor axis is automatically held constant in changing wind velocities.
  • This has the same effect as for other prior art as described above. That is to say that the forces acting in the direction of the rotational direction of the blades, i.e., perpendicular to the wind direction, and which cause the blade to rotate, are held constant.
  • a side effect of this is that the thrust of the blade in the wind direction will vary in the same way as described above for other prior art.
  • this prior art will have the same effect on fatigue of the blades and tower because of varying thrust on the rotor blades when an attempt is made to hold the rotor torque constant.
  • the object of the invention is to overcome the disadvantages of the prior art.
  • a method for controlling the output of a wind power plant comprising a converter unit, wherein when the output power of the converter unit is within a given range, the pitch angle of the rotor blades is changed with a view to minimising variations of the thrust of the rotor blades in the wind direction individually or collectively, and when the output power of the converter unit is outside this range, the pitch angle of the rotor blades is changed with a view to bringing the output power within the range.
  • variations of the thrust of the rotor blades in the wind direction are minimised by regulating towards a calculated target value for the thrust of the rotor blades in the wind direction, the target value for the thrust in the wind direction being different for different average wind velocities.
  • the target value for the thrust of the rotor blades in the wind direction is adjusted in relation to average converter unit output or rotor speed over a given period of time. In still another embodiment of the invention, the target value for the thrust of the rotor blades in the wind direction is pre-defined and related to given average wind velocities.
  • the thrust of the rotor blades in the wind direction is in addition adjusted by changing the rotor rpm by adjusting the generator rotation resistance moment and/or rotor brakes.
  • the momentary thrust of the rotor blades in the wind direction is determined directly or indirectly by means of strain gauges, wind velocity measurements, by measuring geometric deflection of the blades, measuring the generator torque and/or measuring the generator output together with simultaneous measurement of the pitch angles of the blade or blades, and/or by measuring or using the pitch moment of the blades about the rotational axis of the pitch bearing either by mounting the blades leaning backwards in the pitch bearing, or by shaping the blades so that the impact point of the wind on the blade is behind the rotational axis of the pitch bearing in relation to the rotational direction of the rotor.
  • the pitch angle of the rotor blades is in addition changed with a view to minimising direction errors for the wind power plant.
  • the direction error is corrected if it is outside a given range.
  • the pitch angle of the rotor blades is adjusted differently for different rotational positions. In one embodiment, the pitch angles of the rotor blades are adjusted individually and/or independent of one another.
  • the wind field in a plane substantially perpendicular to the wind direction is predicted by using directly or indirectly measured values of the wind forces acting on the rotor blade or blades that is/are at the front in relation to the rotational direction of the rotor.
  • the thrust of the rotor blades in the wind direction is used actively to counteract motions of the wind power plant tower by regulating the pitch angles of the rotor blades.
  • one or more anemometers/wind gauges are placed in a suitable location or locations on the wind power plant so that the spatial distribution of the wind velocity can be recorded and interpolations between the different anemometers can be made to form a picture of the distribution of the wind across the sweeping area of the rotor. This can be done by placing anemometers at substantially different heights and in substantially different horizontal positions. This spatial distribution of the momentary wind velocity can then be used to individually regulate the pitch of the rotor blades, optionally all the blades may be pitch-regulated collectively.
  • the wind field in a plane that is essentially perpendicular to the wind direction can be predicted by using directly or indirectly measured values of the wind forces which act on the rotor blade or blades which is/are at the front in relation to the rotational direction of rotor.
  • the rotor may advantageously be positioned downwind of the tower so that the anemometers record the wind velocity before it impinges on the rotor.
  • directly or indirectly measured values of the thrust on the blade that is at the front in relation to the rotational direction of the rotor, of a given blade can be used to predict the wind field into which the given blade will move.
  • the optimal pitch angle of the blades can be calculated in advance so that there is little or no delay between the aerodynamic forces and the pitch response of the rotor blades.
  • sudden changes in the momentary wind velocity can be predicted.
  • the time delay from when the measurements are made until the actual wind velocity occurs in the rotor can be calculated.
  • the controller unit that controls the pitch regulations is given access to all these measurements and can at any given time use this information to optimise the pitch angles of the blades.
  • the blades will initially be turned so that the axial force on the rotor is reduced. This is countered by increasing the rotational speed of the rotor by means of reduced or no pitch response whilst the generator torque optionally at the same time is reduced in accordance with input from the control unit which also will help to increase the rotational speed of the rotor. Both the rotor axial force and the output of the generator can then be held almost constant at optimal pitch angle within a small wind velocity increase. At a wind increase of about 10%>, the rotational speed according to this method must be increased by about 10% to obtain both unchanged rotor axial force and unchanged output to the generator. The pitch angle must be changed at the same time. A similar method is used when there is a decrease in momentary wind velocity, but in that case the rotational speed of the rotor is reduced whilst the generator torque is, optionally simultaneously, increased in accordance with input from the control unit.
  • the average generator output will be almost unchanged, i.e., equal to the nominal output (rated power), whilst the axial force for a given average wind velocity can be held constant or almost constant, typically within a +/-20% variation of the momentary wind velocity.
  • the rotor axial force target value
  • Acceptable maximum and minimum values for the generator output variations around a mean value can be pre-programmed, and the pitch controller unit will then calculate optimal momentary pitch angles so that the rotor axial force is held as constant as possible around the said calculated target value whilst the generator output is maintained within the pre-programmed bandwidth.
  • the calculated target value for the rotor axial force will therefore vary with different average wind velocities. Within each average wind velocity, an attempt will then be made to keep the axial force almost constant using pitch regulation.
  • the average wind velocity may, for example, be the mean of the last 10 minutes.
  • pre-calculated values may be used for the target values of the axial force for given average wind velocity intervals, e.g., divided into intervals of 0.1 m/s differences.
  • pitch regulation can be carried out giving priority to not varying the generator output by more than the typical approximately +/- 10% as described above.
  • the rotor axial force will start to vary, but also in these cases this variation will be substantially less than for pitch regulation according to the prior art.
  • the same method as described above can also be used to actively regulate the rotor axial force in relation to a given mean value. If the rotor axial force in this way is actively controlled with varying value, this can be used, e.g., to apply forces to the tower in counter phase with its motions so that the motions of the tower are dampened.
  • the motions of the tower can, e.g., be recorded using an accelerometer.
  • the axial force can be used actively in a similar manner to counter any forces that try to turn the rotor out of the wind. This can be done by controlling the individual force of the rotor blades in the wind direction so that any torques that try to turn the rotor and/or the nacelle and/or the tower out of the wind are countered, reduced or eliminated by cyclically changing the individual pitch angle of the blades according to the physical position of each individual blade at any given time, so that the axial force on the rotor is greater on one side or the other of the vertical axis of the rotor, as required.
  • the pitch angle is increased, e.g., by 0.5 degrees, and when the same blade passes the opposite side, the pitch angle is decreased correspondingly. Therefore, this does not need to have any effect on the total rotor output or the total rotor axial force.
  • the extra cyclic pitch variation is superposed only on the calculated pitch angle according to the above-described method in order to control the total rotor axial force.
  • This described cyclic pitch regulation can also be used to actively control the rotor so that parts of, or optionally the whole of the wind power plant in the case of a floating plant, can be held in the desired position relative to the wind direction.
  • the thrust variations in the wind direction on each individual blade can be reduced by changing the pitch angle according to the above-described method in order to control the momentary thrust of the blade in the wind direction.
  • the blade can then be controlled individually in relation to its position in its orbit and to measured values of the wind velocities in different positions in or around the sweeping area of the rotor.
  • the measured axial force will be recorded and included in the pitch controller unit for calculation of optimal pitch angle at any given time according to the described method.
  • the pitch controller unit instead of just using measured wind velocity and pitch angle to calculate the rotor axial force, several other direct or indirect methods can be used.
  • the longitudinal axis of the blade deviates slightly from the pitch bearing shaft axis so that the longitudinal axis of the blades does not intersect the rotor rotational axis, and the pitch moment which then occurs can be measured via hydraulic pressure via the blade pitch control system and the axial force can then be calculated; or
  • strain gauges on the blades and/or on the main shaft of the rotor and/or on other parts of the wind power plant;
  • Fig. 1 shows a floating wind power plant 1 with rotor 2 which may have a horizontally or substantially horizontally mounted rotor axis 1 1 mounted downwind of tower 4.
  • the figure also shows mill housing 3, anemometers 5, anchor connection 6 and anchor 7.
  • Fig. 2 shows a wind power plant 1 located on land or in shallow water with rotor 2 which has a horizontally or substantially horizontally mounted rotor axis 1 1 mounted upwind of tower 4.
  • the figure also shows mill housing 3 and anemometers 5.
  • Fig. 3 shows a wind power plant 1 that is located either on land or in shallow water or floating in water with rotor blades 13 which are rotatably mounted about their longitudinal axis or substantially about their longitudinal axis 14 with pitch bearings 10.
  • Fig. 4 is a flow diagram illustrating the method according to the invention.
  • Fig. 5 is a flow diagram for an optional part of the method according to the invention.
  • a wind power plant 1 with a horizontal or substantially horizontal rotor axis 1 1 consists of one or more rotor blades 1 ) which together form a rotor 2, where the rotor blades in a coordinated manner or individually can be turned (pitched) around their own longitudinal axis or essentially around their own longitudinal axis 14 primarily in order to control the rotor 2 output to the generator (not shown), and where the rotor shaft is secured in a mill housing 3 and the rotor shaft is connected to the generator optionally via a transmission system (gear).
  • the pitch regulation of the rotor blades is carried out by a pitch control unit which on the basis of different recorded operational information, wind measurements etc. transmits a signal to the pitch motors indicating the amount of the required change in pitch angle at any given time.
  • the mill housing may be mounted on a tower 4 which is fixedly mounted on land 9 or on the seabed 8 or which is a part of a floating device or which itself constitutes a floating device with optionally one or more anchor connections 6 to an anchor 7 on the seabed 8.
  • the design of the anchor system 6, 7 is of no importance for the described method.
  • One of the objects of the method described below is to reduce the variations of the rotor axial force compared with the prior art, whilst the resultant output to the generator is not significantly affected or is maintained within acceptable limits in relation to limitations of the drive gear, generator and power grid. It is also an object of the method to use the rotor axial force to actively counter the motions of a floating wind power plant. Furthermore, it is an object of the described method to control and counter rotational forces about the vertical axis 12 of the tower and to reduce the aerodynamic force variation on each individual blade through a whole rotation cycle resulting from different wind velocities at different levels (vertical wind shear) and in the horizontal direction parallel to the rotor plane (horizontal wind shear).
  • One or more anemometers 5 are placed in a suitable location or locations on the wind power plant 1 so that the spatial distribution of the wind velocity can advantageously be recorded and interpolations between the different anemometers can be made to form a picture of the distribution of the wind across the sweeping area of the rotor. This can be done by placing anemometers at substantially different levels and in substantially different horizontal positions. This spatial distribution of the momentary wind velocity can then be used to individually regulate the pitch of the rotor blades, optionally all the blades can be pitch- regulated collectively.
  • the rotor 2 may advantageously be positioned downwind of the tower 4 so that the anemometers record the wind velocity before it impinges on the rotor.
  • the optimal pitch angle of the blades can be calculated in advance so that there is little or no delay between aerodynamic forces and the pitch response of the rotor blades.
  • sudden changes of the momentary wind velocity can be predicted.
  • the controller unit (not shown) that controls the pitch regulation is given access to all these measurements and can at any given time use this information to optimise the pitch angles of the blades 13.
  • the controller unit (not shown) that controls the pitch regulation is given access to all these measurements and can at any given time use this information to optimise the pitch angles of the blades 13.
  • the rotational speed of the rotor 2 will be increased by means of reduced pitch response compared to the prior art, whilst the generator torque is, optionally simultaneously, reduced in accordance with input from the control unit, which will also help to increase the rotational speed of the rotor 2. Since the rotor axial force in general is increased on increased rpm for a given rotor output, the reduced rotor axial force resulting from the pitch turning of the blades in response to the increased momentary wind velocity can be compensated.
  • both the rotor axial force and the output of the generator can be held almost constant by increasing the rotational speed of the rotor and with optimal pitch angle.
  • the rotational speed must according to this method be increased by about 10% to obtain both unchanged rotor axial force and unchanged output to the generator.
  • the pitch angle must be changed at the same time.
  • the average generator output will be almost unchanged, i.e., equal to the nominal output (rated power), whilst the axial force for a given average wind velocity can be held constant or almost constant, typically within a +/-20% variation of the momentary wind velocity.
  • the rotor axial force (target value), which corresponds to the nominal output of the generator, can be calculated.
  • Acceptable maximum and minimum values for generator output variations around a mean value can be pre-programmed, and the pitch controller unit will then calculate optimal momentary pitch angles (in response to the momentary wind velocity) so that the rotor axial force is held as constant as possible around said calculated target value whilst the generator output is maintained within the pre-programmed bandwidth.
  • the calculated target value for rotor axial force will vary with different average wind velocities. Within each average wind velocity, an attempt will then be made to keep the axial force almost constant around this target value using pitch regulation.
  • the average wind velocity may, for example, be the mean of the last 10 minutes.
  • pre-calculated values may be used for the target values of the axial force for given average wind velocity intervals, e.g., divided into intervals of 0.1 m/s differences.
  • pitch regulation can be carried out giving priority to not varying the generator output by more than the typical bandwidth of about +/- 10% as described.
  • the rotor axial force will start to vary, but also in these cases this variation will be substantially less than for pitch regulation according to the prior art.
  • the same method as described above can also be used to actively regulate the rotor axial force around a given mean value. If the rotor axial force is in this way actively controlled with varying value, this can be used, e.g., to apply forces to the tower 1 in counter phase with its motions so that the motions of the tower are dampened. This is particularly advantageous for floating wind power plants.
  • the control unit will in this case also have access to the motions of the tower.
  • the motions of the tower can, e.g., be recorded using an accelerometer or other suitable measuring method.
  • the axial force can be used actively in a similar manner to counter any forces that try to turn the rotor out of the wind. This can be done by controlling the individual force of the rotor blades in the wind direction so that any torques that try to turn the rotor and/or the mill housing and/or the tower out of the wind are countered, reduced or eliminated by cyclically changing the individual pitch angle of the blades according to the physical position of each individual blade at any given time, so that the axial force on the rotor is greater on one side or the other of the vertical axis of the rotor as required.
  • the pitch angle is increased, e.g., by 0.5 degrees, and when the same blade passes the opposite side, the pitch angles is decreased correspondingly. Therefore, this does not need to have any effect on the total rotor output or the total rotor axial force.
  • the extra cyclic pitch variation is superposed on the calculated pitch angle according to the above-described method in order to control the total rotor axial force.
  • This described cyclic pitch regulation can also be used to actively control the rotor 2 so that parts of, or optionally the whole of the wind power plant in the case of a floating plant, can be held in the desired position relative to the wind direction.
  • the thrust variations in the flap direction (normally approximately the same as the wind direction) on each individual blade (which together constitute the rotor axial force) is reduced by changing the pitch angle according to the above- described method in order to control the momentary thrust of the blade in the wind direction.
  • the blade can then be controlled individually in relation to its position in its orbit and to directly or indirectly measured values of the wind velocities in different positions in or around the sweeping area of the rotor.
  • the measured or calculated axial force will be recorded and included in the pitch controller unit for calculation of optimal pitch angle at any given time according to the described method.
  • the longitudinal axis 14 of the blade deviates slightly from the pitch bearing shaft axis so that the longitudinal axis 14 of the blades does not intersect the rotor rotational axis 1 1 and the pitch moment which then occurs can be measured via hydraulic pressure via the blade pitch control system, and the rotor blade thrust in the wind direction for each individual blade can then be calculated; or
  • strain gauges on the blades 13 and/or on the main shaft of the rotor and/or on other parts of the wind power plant; or Indirectly by measuring the pitch angles of the blade(s) 13 and the rotor 2 torque directly or by recording other parameters such as the generator torque, output etc. and then the corresponding rotor axial force of the rotor can be calculated.
  • FIG. 4 By measuring deflection of the blades using a mechanical or electronic measuring system.
  • An embodiment of the method according to the invention is illustrated in Fig. 4 by means of a flow chart. The method is based on the determination in 40 of whether an instantaneous/momentary rotor speed, or optionally output power of the generator is within a range of the nominal value for the wind power plant, in the example, by determining whether the rotor speed or optionally the output power of the generator is within +/- 10% of the nominal value.
  • the instantaneous/momentary rotor speed optionally the output power of the generator
  • an attempt will be made to minimise the rotor axial force variations, optionally the thrust of each blade in the wind direction individually, by regulating towards a target value for the axial force.
  • average rotor speed or average generator output power for a given time t e.g., the last 10 minutes, is above or below the nominal output of the wind power plant. According to this, the target value for the rotor axial force is adjusted in 45, 46.
  • a new target value for the axial force can be calculated on the basis of the mean value of the axial force over a given period of time t, for example, of 10 minutes with a given incremental increase or reduction of the target value for axial force depending upon whether it is desired to increase or decrease the average output of the generator.
  • the target value for the rotor axial force may also optionally be a pre-calculated value related to the average wind velocity. The instantaneous value of the rotor axial force is then compared in 47 with the target value for the axial force as achieved in 45/46 and the rotor blade pitch angle is then changed in 48 and 49 in accordance with this comparison.
  • the instantaneous/momentary rotor speed, or optionally the output power of the generator, as calculated in 40 is outside the given range, an attempt is made to come within this range by adjusting the pitch angle in the same way as in the prior art in order to bring the rotor speed, or optionally the average output power of the generator within the desired range, e.g., within +/-10% of the nominal.
  • the pitch angle is adjusted in 42/43 according to the calculation in 41 of whether instantaneous/momentary rotor speed, or optionally output power of the generator, is above or below the desired range.
  • the pitch angle is adjusted primarily with a view to maintaining a constant rotor axial force regulated towards a slow-varying target value, and unlike the prior art, the pitch angle will only be adjusted to the extent necessary to bring generator output power or rotor speed within the desired range.
  • the pitch angle of the rotor blades can be adjusted either for all the rotor blades collectively, or for each individual rotor blade.
  • directional information for the wind power plant can be taken into account, in addition to the aforementioned moments, with a view to holding the wind power plant in a stable position.
  • This information 50 is taken into account in step 47 in the figure.
  • Figure 5 illustrates in more detail the steps for providing this directional information.
  • step 51 sinus( ⁇ ) is calculated or recorded, where ⁇ is the rotational position of the blade, i.e., it describes where in the rotation each individual rotor blade is.
  • step 52 it is decided whether the direction error of the wind power plant direction relative to the wind direction is outside a given range, in this case +/-5°. If the direction error is within the range, no action is taken, but if the direction error is outside the range, a rotational mechanism for the tower is optionally triggered and a signal is calculated in 55, 56 according to which side of the range the direction error is on. The information provided in 55 or 56 is superposed on the control signals provided to adjust the pitch angle with respect to the rotor axial force variations, optionally the thrust of each individual blade in the wind direction.
  • the direction error information comprises information about rotational position, i.e., the pitch angle is adjusted individually for each blade according to its momentary rotational position. This means that the thrust of each individual blade in the wind direction is adjusted differently for the different rotational positions so that a force effect is obtained that counters the direction error for the wind power plant.

Landscapes

  • 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)
PCT/NO2005/000096 2004-03-22 2005-03-18 A method for reduction of axial power variations of a wind power plant WO2005090781A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2007504903A JP5006186B2 (ja) 2004-03-22 2005-03-18 風力発電所の軸方向の動力変化を減少させる方法
KR1020067020476A KR101145255B1 (ko) 2004-03-22 2005-03-18 풍력 발전소의 출력 제어 방법
AU2005224580A AU2005224580B2 (en) 2004-03-22 2005-03-18 A method for reduction of axial power variations of a wind power plant
US10/599,109 US20070212209A1 (en) 2004-03-22 2005-03-18 Method For Reduction Of Axial Power Variations Of A Wind Power Plant
CA2564635A CA2564635C (en) 2004-03-22 2005-03-18 A method for reduction of axial power variations of a wind power plant
EP05731806A EP1738073A1 (en) 2004-03-22 2005-03-18 A method for reduction of axial power variations of a wind power plant
NO20064791A NO342746B1 (no) 2004-03-22 2006-10-23 Fremgangsmåte for reduksjon av aksielle kraftvariasjoner i et vindkraftverk.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20041208A NO20041208L (no) 2004-03-22 2004-03-22 Fremgangsmate for reduskjon av aksialkraftvariasjoner for rotor samt retningskontroll for vindkraft med aktiv pitchregulering
NO20041208 2004-03-22

Publications (1)

Publication Number Publication Date
WO2005090781A1 true WO2005090781A1 (en) 2005-09-29

Family

ID=34859221

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2005/000096 WO2005090781A1 (en) 2004-03-22 2005-03-18 A method for reduction of axial power variations of a wind power plant

Country Status (8)

Country Link
US (1) US20070212209A1 (no)
EP (1) EP1738073A1 (no)
JP (1) JP5006186B2 (no)
KR (1) KR101145255B1 (no)
AU (1) AU2005224580B2 (no)
CA (1) CA2564635C (no)
NO (2) NO20041208L (no)
WO (1) WO2005090781A1 (no)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043895A1 (en) * 2005-10-13 2007-04-19 Sway As Speed control system for a wind power plant's rotor and an aerodynamic brake
WO2008044066A2 (en) * 2006-10-10 2008-04-17 Iti Scotland Limited Wind and wave power generation
WO2008067814A2 (en) * 2006-12-08 2008-06-12 Vestas Wind Systems A/S A method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof
NO325856B1 (no) * 2005-11-01 2008-08-04 Hywind As Fremgangsmåte for demping av ustabile frie stivlegeme egensvingninger ved en flytende vindturbininstallasjon
EP1956236A1 (en) * 2007-02-06 2008-08-13 Hansen Transmissions International Nv Pitch control in a wind turbine
WO2009033484A2 (en) * 2007-09-13 2009-03-19 Vestas Wind Systems A/S A method of controlling a wind turbine, a wind turbine and use of a method
WO2009040442A1 (en) * 2007-09-28 2009-04-02 Shell Internationale Research Maatschappij B.V. Method for enhancing recovery of a hydrocarbon fluid
WO2010122316A1 (en) * 2009-04-24 2010-10-28 Statoil Asa Extracting wave energy in a wind turbine installation
CN101978161A (zh) * 2008-10-29 2011-02-16 三菱重工业株式会社 风力发电装置及其控制方法
US7898100B2 (en) 2007-04-30 2011-03-01 Vestas Wind Systems A/S Method of operating a wind turbine with pitch control, a wind turbine and a cluster of wind turbine
US8109733B2 (en) 2005-12-29 2012-02-07 Lm Glasfiber A/S Variable speed hub
EP2489872A1 (en) * 2011-02-15 2012-08-22 SSB Wind Systems GmbH & Co. KG Blade load reduction for wind turbine
EP2333328A3 (en) * 2009-12-11 2013-12-25 Hitachi, Ltd. Offshore wind turbine
WO2014067661A3 (de) * 2012-10-31 2014-06-26 2-B Energy B.V. Verfahren zum ausrichten einer windkraftanlage durch ein giermoment des rotors
US9732730B2 (en) 2013-01-15 2017-08-15 Envision Energy (Denmark) Aps Partial pitch wind turbine with floating foundation
EP1816347B1 (en) 2006-02-01 2018-06-06 Hitachi, Ltd. Wind turbine generator
US10539116B2 (en) 2016-07-13 2020-01-21 General Electric Company Systems and methods to correct induction for LIDAR-assisted wind turbine control
CN111271224A (zh) * 2020-04-24 2020-06-12 杭州沃门峡电子科技有限公司 一种便于维修的风能发电塔
CN115680902A (zh) * 2022-10-13 2023-02-03 中国航发四川燃气涡轮研究院 一种航空发动机转子轴向力调整方法

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8197179B2 (en) * 2001-06-14 2012-06-12 Douglas Spriggs Selsam Stationary co-axial multi-rotor wind turbine supported by continuous central driveshaft
BRPI0621442A2 (pt) * 2006-03-16 2011-12-13 Vestas Wind Sys As método para reduzir fadiga por efeito de cargas nos componentes de uma turbina eólica submetida a esforço assimétrico de carga de seu rotor, sistema de controle para reduzir as fadiga por efeito de cargas nos componentes de uma turbina eólica submetidos a esforço assimétrico de carga no plano de seu rotor, turbina eólica, e área de captação de ventos
EP2132437B2 (en) * 2007-03-30 2018-10-03 Vestas Wind Systems A/S Wind turbine with pitch control
JP4994947B2 (ja) * 2007-05-21 2012-08-08 三菱重工業株式会社 風力発電装置および風力発電装置のヨー旋回駆動方法
US7612462B2 (en) * 2007-10-08 2009-11-03 Viterna Larry A Floating wind turbine system
DE102007063082B4 (de) * 2007-12-21 2010-12-09 Repower Systems Ag Verfahren zum Betreiben einer Windenergieanlage
EP2148225B1 (en) * 2008-07-22 2016-11-02 Siemens Aktiengesellschaft Method and arrangement for the forecast of wind-resources
KR101375768B1 (ko) * 2009-09-01 2014-03-18 현대중공업 주식회사 풍력발전기의 개별 블레이드 피치 제어 방법 및 제어 시스템
GB2479413A (en) 2010-04-09 2011-10-12 Vestas Wind Sys As Wind Turbine Independent Blade Control Outside The Rated Output
GB2479415A (en) 2010-04-09 2011-10-12 Vestas Wind Sys As Wind Turbine Independent Blade Control Outside The Rated Output
FR2966175B1 (fr) * 2010-10-18 2012-12-21 Doris Engineering Dispositif de support d'une eolienne de production d'energie electrique en mer, installation de production d'energie electrique en mer correspondante.
KR101253014B1 (ko) * 2011-03-11 2013-04-15 미츠비시 쥬고교 가부시키가이샤 블레이드 피치 제어 장치, 풍력 발전 장치, 및 블레이드 피치 제어 방법
EP2910778A4 (en) * 2012-12-19 2015-11-18 Mitsubishi Heavy Ind Ltd WINDMILL AND METHOD FOR OPERATING THE SAME
GB201223088D0 (en) 2012-12-20 2013-02-06 Statoil Asa Controlling motions of floating wind turbines
CN107503885B (zh) * 2012-12-26 2019-06-07 菱重维斯塔斯海上风力有限公司 浮体式风力发电装置的控制装置和控制方法
WO2014102956A1 (ja) 2012-12-27 2014-07-03 三菱重工業株式会社 浮体式風力発電装置の制御方法及び制御装置、並びに浮体式風力発電装置
KR101540329B1 (ko) * 2013-12-16 2015-07-30 삼성중공업 주식회사 풍력 발전기 및 그 제어방법
DE102015209109A1 (de) * 2015-05-19 2016-11-24 Wobben Properties Gmbh Messanordnung an einer Windenergieanlage
NL2015992B1 (en) * 2015-12-18 2017-07-13 Univ Groningen Biomimetic wind turbine design with lift-enhancing periodic stall.
US11149711B2 (en) 2015-12-23 2021-10-19 Vestas Wind Systems A/S Control method for a wind turbine
EP3324043A1 (en) * 2016-11-21 2018-05-23 LM WP Patent Holding A/S Method for controlling a floating offshore wind turbine, wind turbine control system and floating offshore wind turbine
WO2020224738A1 (en) * 2019-05-09 2020-11-12 Vestas Wind Systems A/S Wind turbine control using predicted steady-state deflection

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201514A (en) 1976-12-04 1980-05-06 Ulrich Huetter Wind turbine
US4297076A (en) 1979-06-08 1981-10-27 Lockheed Corporation Wind turbine
DE19628073C1 (de) 1996-07-12 1997-09-18 Aerodyn Energiesysteme Gmbh Verfahren zur Justierung der Blattwinkel einer Windkraftanlage
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

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339666A (en) * 1980-12-24 1982-07-13 United Technologies Corporation Blade pitch angle control for a wind turbine generator
US4410806A (en) * 1981-09-03 1983-10-18 Brulle Robert V Control system for a vertical axis windmill
US4420692A (en) * 1982-04-02 1983-12-13 United Technologies Corporation Motion responsive wind turbine tower damping
US4435647A (en) * 1982-04-02 1984-03-06 United Technologies Corporation Predicted motion wind turbine tower damping
US4515525A (en) * 1982-11-08 1985-05-07 United Technologies Corporation Minimization of the effects of yaw oscillations in wind turbines
US4656362A (en) * 1982-11-08 1987-04-07 United Technologies Corporation Blade pitch angle control for large wind turbines
JPS59183085A (ja) * 1983-04-01 1984-10-18 Yamaha Motor Co Ltd ロ−タの回転速度制御装置を備えた風車
US4584486A (en) * 1984-04-09 1986-04-22 The Boeing Company Blade pitch control of a wind turbine
US5178518A (en) * 1990-05-14 1993-01-12 Carter Sr J Warne Free-yaw, free-pitch wind-driven electric generator apparatus
US5584655A (en) * 1994-12-21 1996-12-17 The Wind Turbine Company Rotor device and control for wind turbine
JPH1150945A (ja) * 1997-08-04 1999-02-23 Mitsubishi Heavy Ind Ltd 風力発電装置の発電量制御方法
US6327957B1 (en) * 1998-01-09 2001-12-11 Wind Eagle Joint Venture Wind-driven electric generator apparatus of the downwind type with flexible changeable-pitch blades
CN1092760C (zh) * 1998-01-14 2002-10-16 丹麦控制工程公司 测量和控制风力发动机的振动的方法
AU5153299A (en) * 1998-08-13 2000-03-06 Neg Micon A/S A method and a device for adjusting the pitch and stopping the rotation of the blades of a wind turbine
EP1126163A1 (en) * 2000-02-16 2001-08-22 Turbowinds N.V./S.A. Blade pitch angle control device for wind turbine
DE10016912C1 (de) * 2000-04-05 2001-12-13 Aerodyn Eng Gmbh Turmeigenfrequenzabhängige Betriebsführung von Offshore-Windenergieanlagen
CA2516477C (en) * 2003-02-18 2009-09-29 Forskningscenter Riso Method of controlling aerodynamic load of a wind turbine based on local blade flow measurement
US7121795B2 (en) * 2004-06-30 2006-10-17 General Electric Company Method and apparatus for reducing rotor blade deflections, loads, and/or peak rotational speed
DE102005048805A1 (de) * 2005-10-10 2007-04-12 Daubner & Stommel GbR Bau-Werk-Planung (vertretungsberechtigter Gesellschafter: Matthias Stommel, 27777 Ganderkesee) Verfahren zum Betreiben einer Windenergieanlage
DE102005059888C5 (de) * 2005-12-15 2016-03-10 Nordex Energy Gmbh Verfahren zur Momenten- und Pitchsteuerung für eine Windenergieanlage abhängig von der Drehzahl

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201514A (en) 1976-12-04 1980-05-06 Ulrich Huetter Wind turbine
US4297076A (en) 1979-06-08 1981-10-27 Lockheed Corporation Wind turbine
DE19628073C1 (de) 1996-07-12 1997-09-18 Aerodyn Energiesysteme Gmbh Verfahren zur Justierung der Blattwinkel einer Windkraftanlage
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

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043895A1 (en) * 2005-10-13 2007-04-19 Sway As Speed control system for a wind power plant's rotor and an aerodynamic brake
US8186949B2 (en) 2005-11-01 2012-05-29 Statoilhydro Asa Method for damping tower vibrations in a wind turbine installation
NO325856B1 (no) * 2005-11-01 2008-08-04 Hywind As Fremgangsmåte for demping av ustabile frie stivlegeme egensvingninger ved en flytende vindturbininstallasjon
US8109733B2 (en) 2005-12-29 2012-02-07 Lm Glasfiber A/S Variable speed hub
EP1816347B1 (en) 2006-02-01 2018-06-06 Hitachi, Ltd. Wind turbine generator
WO2008044066A3 (en) * 2006-10-10 2008-08-07 Iti Scotland Ltd Wind and wave power generation
WO2008044066A2 (en) * 2006-10-10 2008-04-17 Iti Scotland Limited Wind and wave power generation
US8053916B2 (en) 2006-10-10 2011-11-08 Iti Scotland Limited Wind and wave power generation
WO2008067814A3 (en) * 2006-12-08 2008-10-16 Vestas Wind Sys As A method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof
WO2008067814A2 (en) * 2006-12-08 2008-06-12 Vestas Wind Systems A/S A method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof
CN101589229B (zh) * 2006-12-08 2011-11-16 维斯塔斯风力系统有限公司 减弱风轮机的一个或多个叶片中的边沿振荡的方法,主动失速控制式风轮机及其使用
US8070437B2 (en) 2006-12-08 2011-12-06 Vestas Wind Systems A/S Method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof
EP1956236A1 (en) * 2007-02-06 2008-08-13 Hansen Transmissions International Nv Pitch control in a wind turbine
US7898100B2 (en) 2007-04-30 2011-03-01 Vestas Wind Systems A/S Method of operating a wind turbine with pitch control, a wind turbine and a cluster of wind turbine
WO2009033484A2 (en) * 2007-09-13 2009-03-19 Vestas Wind Systems A/S A method of controlling a wind turbine, a wind turbine and use of a method
WO2009033484A3 (en) * 2007-09-13 2009-11-12 Vestas Wind Systems A/S A method of controlling a wind turbine, a wind turbine and use of a method
WO2009040442A1 (en) * 2007-09-28 2009-04-02 Shell Internationale Research Maatschappij B.V. Method for enhancing recovery of a hydrocarbon fluid
US8450867B2 (en) 2008-10-29 2013-05-28 Mitsubishi Heavy Industries, Ltd. Wind turbine generator and its control method
CN101978161A (zh) * 2008-10-29 2011-02-16 三菱重工业株式会社 风力发电装置及其控制方法
CN102575646A (zh) * 2009-04-24 2012-07-11 海文德股份公司 在风力涡轮机装置中提取波浪能
WO2010122316A1 (en) * 2009-04-24 2010-10-28 Statoil Asa Extracting wave energy in a wind turbine installation
US9702344B2 (en) 2009-04-24 2017-07-11 Hywind As Control method for a floating wind turbine
EP2333328A3 (en) * 2009-12-11 2013-12-25 Hitachi, Ltd. Offshore wind turbine
WO2012110173A2 (en) 2011-02-15 2012-08-23 Ssb Wind Systems Gmbh &Co.Kg Blade load reduction for wind turbines
WO2012110173A3 (en) * 2011-02-15 2013-01-03 Ssb Wind Systems Gmbh &Co.Kg Blade load reduction for wind turbines
CN102644546A (zh) * 2011-02-15 2012-08-22 Ssb风系统两合公司 风力涡轮机的叶片载荷减少
EP2489872A1 (en) * 2011-02-15 2012-08-22 SSB Wind Systems GmbH & Co. KG Blade load reduction for wind turbine
WO2014067661A3 (de) * 2012-10-31 2014-06-26 2-B Energy B.V. Verfahren zum ausrichten einer windkraftanlage durch ein giermoment des rotors
CN105264221A (zh) * 2012-10-31 2016-01-20 2-B能源有限责任公司 用于通过转子的偏转力矩使风能设施定向的方法
US9732730B2 (en) 2013-01-15 2017-08-15 Envision Energy (Denmark) Aps Partial pitch wind turbine with floating foundation
US10539116B2 (en) 2016-07-13 2020-01-21 General Electric Company Systems and methods to correct induction for LIDAR-assisted wind turbine control
CN111271224A (zh) * 2020-04-24 2020-06-12 杭州沃门峡电子科技有限公司 一种便于维修的风能发电塔
CN115680902A (zh) * 2022-10-13 2023-02-03 中国航发四川燃气涡轮研究院 一种航空发动机转子轴向力调整方法
CN115680902B (zh) * 2022-10-13 2024-05-03 中国航发四川燃气涡轮研究院 一种航空发动机转子轴向力调整方法

Also Published As

Publication number Publication date
KR20070002038A (ko) 2007-01-04
CA2564635C (en) 2012-12-11
AU2005224580B2 (en) 2011-02-24
NO20064791L (no) 2006-12-21
NO20041208L (no) 2005-09-23
KR101145255B1 (ko) 2012-06-01
NO342746B1 (no) 2018-08-06
US20070212209A1 (en) 2007-09-13
CA2564635A1 (en) 2005-09-29
AU2005224580A1 (en) 2005-09-29
JP5006186B2 (ja) 2012-08-22
NO20041208D0 (no) 2004-03-22
EP1738073A1 (en) 2007-01-03
JP2007530856A (ja) 2007-11-01

Similar Documents

Publication Publication Date Title
CA2564635C (en) A method for reduction of axial power variations of a wind power plant
US7351033B2 (en) Wind turbine load control method
EP2306007B1 (en) Method and system for controlling a wind turbine
EP2927484B1 (en) Yaw and pitch angles
KR101634727B1 (ko) 풍력 발전기 제어 방법
US7566982B2 (en) Method for controlling and adjusting a wind turbine
US8215906B2 (en) Variable tip speed ratio tracking control for wind turbines
US6441507B1 (en) Rotor pitch control method and apparatus for parking wind turbine
EP1907695B8 (en) Wind flow estimation and tracking using tower dynamics
EP2167814B1 (en) Control of rotor during a stop process of a wind turbine
EP2500562A2 (en) Methods and systems for alleviating the loads generated in wind turbines by wind asymmetries
EP2754890B1 (en) Method and Apparatus for Controlling an Operational Parameter of a Wind Turbine
EP1442216A1 (en) Rotor with extendable blades and control criteria therefor
US20190048849A1 (en) Improvements relating to controlling bearing wear
KR102018579B1 (ko) 풍력터빈 제어시스템의 피치제어기
JP7455722B2 (ja) 風力発電装置とその制御方法
WO2023078521A1 (en) A method for reducing blade flap loads in a wind turbine
KR20240013755A (ko) 회전자를 각각 구비하는 두 개의 풍력 에너지 변환 유닛을 갖는 단일-지점-계류 풍력 터빈
ES2829201T3 (es) Turbina eólica

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2007504903

Country of ref document: JP

Ref document number: 2564635

Country of ref document: CA

NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Ref document number: DE

WWE Wipo information: entry into national phase

Ref document number: 1020067020476

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 5797/DELNP/2006

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 2005731806

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2005224580

Country of ref document: AU

ENP Entry into the national phase

Ref document number: 2005224580

Country of ref document: AU

Date of ref document: 20050318

Kind code of ref document: A

WWP Wipo information: published in national office

Ref document number: 2005224580

Country of ref document: AU

WWP Wipo information: published in national office

Ref document number: 2005731806

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1020067020476

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 10599109

Country of ref document: US

Ref document number: 2007212209

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 10599109

Country of ref document: US