Natural Fluid Current Patents (Class 416/41)
  • Publication number: 20110123332
    Abstract: An energy extraction device for extracting energy from a flow of fluid is provided. The energy extraction device comprises a rotating member for rotatably mounting to a support structure, at least one rotatable bank of blades connected to the rotating member through a connection disposed radially from the main axis of rotation of the rotating member, and, a pitch control system for controlling the angular position of the at least one rotatable bank of blades relative to a direction of the flow of fluid. The rotating member has a main axis of rotation and the at least one bank of blades comprises an array of spaced-apart blades secured together. Each of the at least one bank of blades has a bank axis of rotation.
    Type: Application
    Filed: September 5, 2008
    Publication date: May 26, 2011
    Inventors: Mario Grenier, Alex Grenier-Desbiens, Thomas Grenier-Desbiens, Jéröme Grenier-Desbiens
  • Patent number: 7945350
    Abstract: A system and method for controlling noise generated from a wind turbine is disclosed. The method includes selectively adjusting the angle of pitch of the blade in response to an amount of noise generated being above a predetermined amount and maintaining the amount of noise generated at or below the predetermined amount of noise.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: May 17, 2011
    Assignee: General Electric Company
    Inventors: Kevin Kinzie, Stefan Herr, Benoit Petitjean
  • Patent number: 7942624
    Abstract: One embodiment of a vertical axis wind generator having a stationary vertical shaft (10) supporting with bearings (12) a larger diameter rotating shaft (11) attached by radial connections (13) and support connections (15) to circular support members (16), which are joined to equivalently spaced vertical connections (14). Attached by hinges (18) to these vertical connections (14) are plates (17) held to a radial position to the shafts (10),(11), when the wind force is on them, by cables (19) controlled by electronically controlled winches (25) attached to the circular support members (16). The wind force will close the plates on the opposite side, thus not affecting the rotation, which is transmitted through amplifying gears (21) to the generators (21). Magnetic levitation, which includes an aluminum rail (23), as shown in FIG. 4 would raise the vertical axis wind generator negating friction.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: May 17, 2011
    Inventor: John Walter Erb
  • Publication number: 20110101688
    Abstract: A Multi Purpose Variable Speed Wind Powered Generator is configured to generate electrical power to all types of transportation and equipment in any wind condition. The wind speed monitor gives the variable pitch rotor the precise angle of attack to keep rotor RPM relative and stable at all wind speeds. A wind diverter keeps wind flowing through rotors with out wind back up or bottleneck. An onboard trip computer responds in like sequence in union with the wind monitor and rotors through out each trip. The onboard trip computer is designed to maintain rotor RPM as if the transpiration was moving from 10 to 40 miles per hour. The pitch changes as the wind speed changes keeping the rotor RPM relative. Rotor brakes are to slow or stop rotors movement at any time for any reason.
    Type: Application
    Filed: November 4, 2009
    Publication date: May 5, 2011
    Inventor: John Michael McDuffie
  • Publication number: 20110088382
    Abstract: A device for converting wind energy into a reciprocating motion. The device has a sail that extends in a main wind direction and pivotally oscillates when subjected to wind. The sail is connected to a first support that is configured to move in a first direction when the sail during its oscillation moves towards any of two outermost positions from a neutral position, and move in a second direction opposite the first direction when the sail during its oscillation moves towards its neutral position from any of its outermost positions, thereby creating a reciprocating motion of the first support when the sail is subjected to the wind. A further device, a method and a system are also described.
    Type: Application
    Filed: April 3, 2009
    Publication date: April 21, 2011
    Inventors: Rikard Berthilsson, Mats Alakuela
  • Patent number: 7909574
    Abstract: A monitoring system for at least one wind turbine includes at least one sensor disposed at the at least one wind turbine to detect wind friction at the at least one wind turbine. At least one controller is connected to the at least one wind turbine, and a monitor server is connected to the controller to change an operational status of the at least one wind turbine based on wind friction data received from the at least one sensor. A method of operation of at least one wind turbine includes continuously measuring data relative to wind friction at the at least one wind turbine via at least one sensor located thereat. The data is continuously compared to a predetermined wind friction threshold. A trend in the comparisons is evaluated, and the operational status of the wind turbine is changed via a monitor server based on a result of the comparison.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: March 22, 2011
    Assignee: General Electric Company
    Inventors: Vivek Kumar, Chery Jose, Hemanth Kumar Anjanappa, Sandeep Kumar Vidiyala
  • Patent number: 7909575
    Abstract: A wind turbine blade assembly includes at least one local load sensor disposed on and/or within a surface of the wind turbine blade and at least one active flow modification device disposed on and/or within a surface of the wind turbine blade and configured to alter the aerodynamics of the wind turbine blade in response to real time local load sensor measurements such that a difference between a current angle of attack and an optimum angle of attack on the wind turbine blade is substantially minimized.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: March 22, 2011
    Assignee: General Electric Company
    Inventors: Corneliu Barbu, Anurag Gupta
  • Patent number: 7891944
    Abstract: A method of controlling at least one wind turbine blade during the stopping process of the rotor in a wind turbine system is disclosed. The method optimizes the control velocity of the process in response to one or more feedback values of the system and/or one or more feedback values from the surroundings of the system by altering the angular pitch velocity from 10°/sec during the initial stage of the stopping process to 5°/sec at the final stage of the stopping process. A control system and a wind turbine as well as use hereof are also disclosed.
    Type: Grant
    Filed: July 23, 2004
    Date of Patent: February 22, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Ole Mølgaard Jeppesen, John Bengtson, Torben Møller Hansen
  • Patent number: 7887284
    Abstract: A wind turbine has a hub mounted on a rotatable shaft with a ring concentrically mounted on the shaft. The ring is connected to drive wheels, which in turn drive generators to produce electricity. A controller is connected to control the speed of the turbine by controlling the number and force of contact between the wheels and the ring and also controlling other components such as the pitch, yaw and brakes for the turbine while monitoring the wind conditions.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: February 15, 2011
    Assignee: New World Generation Inc.
    Inventors: Paul H. F. Merswolke, Na'al S. Nayef
  • Patent number: 7870783
    Abstract: The present invention provides a method for measuring the turbulence intensity of a horizontal axis wind turbine that is capable of accurately obtaining the value of the turbulence intensity without the effect of the rotor and by taking into consideration the motion of the nacelle. In the method for measuring the turbulence intensity of a horizontal axis wind turbine, with the nacelle located on the upwind side of the rotor of the horizontal axis wind turbine, measurement values are obtained from an anemometer that is located on the nacelle and an acceleration sensor that is fastened to the nacelle, and the absolute value of the turbulence intensity is calculated based on the measurement values from the anemometer and the measurement values from the acceleration sensor. As a result, it is possible to accurately calculate the absolute value of the turbulence intensity that includes the effect of the movement of the nacelle.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: January 18, 2011
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Shigeo Yoshida, Soichiro Kiyoki
  • Publication number: 20100322768
    Abstract: The variable-geometry blade for use in a wind driven mechanism comprises a fixed blade portion and a movable winglet portion connected to said fixed blade portion and moveable with respect to said fixed blade portion along a direction substantially transverse to the axis of said fixed blade portion. A guide means is provided to guide the movement of said movable winglet portion with respect to said fixed blade portion, and an actuator means is provided for moving said movable winglet portion with respect to said fixed blade portion between a retracted position and an extended position.
    Type: Application
    Filed: September 26, 2008
    Publication date: December 23, 2010
    Inventors: Angelo Comandu, Giovanni Bonomi
  • Patent number: 7834476
    Abstract: A method for running in a drive train component of a wind energy plant, wherein the wind energy plant has an operation management which can control at least one operational variable B significant for the strain of the drive train component to a desired value BS, wherein after starting up the drive train component, the desired value BS is limited by a maximum value BMax, which is preset depending on a yield value W which describes the yield of the wind energy plant achieved since starting up the drive train component.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: November 16, 2010
    Assignee: Nordex Energy GmbH
    Inventors: Joachim Nitzpon, Hauke Karstens, Ulrich Harms
  • Publication number: 20100259046
    Abstract: A wind turbine has a longitudinal airfoil blade that exerts a torque on the generator in response to an impinging air current. A compliant airfoil edge arrangement is disposed along an edge of the airfoil blade for at least a portion of a longitudinal dimension of the airfoil blade. A morphing drive arrangement varies a configuration of the compliant airfoil edge arrangement and consequently the aerodynamic characteristics of the airfoil blade. A drive arrangement applies actuation forces to the upper and lower compliant surfaces via the upper and lower actuation elements. The compliant airfoil edge is arranged as a trailing edge of the airfoil blade.
    Type: Application
    Filed: November 6, 2008
    Publication date: October 14, 2010
    Inventors: Sridhar Kota, Gregory F. Ervin, Dragan Maric, James D. Ervin, Paul W. Keberly
  • Publication number: 20100254812
    Abstract: An apparatus and method for reducing wind turbine damage includes a propeller having a plurality of blades projecting radially from a hub. The blades may be adjustably combined to form variable cross-sections that either increase or decrease propeller rotation speed dependent on wind speed and weather conditions.
    Type: Application
    Filed: April 3, 2009
    Publication date: October 7, 2010
    Applicant: LOCKHEED MARTIN CORPORATION
    Inventor: Elliott Reitz
  • Patent number: 7804186
    Abstract: In embodiments of the present invention improved capabilities are described for the efficiency with which fluid energy is converted into another form of energy, such as electrical energy, where an array of fluid energy conversion modules is contained in a scalable modular networked superstructure. In certain preferred embodiments, a plurality of turbines, such as for instance wind turbines, may be disposed in an array, where the plurality of arrays may be disposed in a suitable arrangement in proximity to each other and provided with geometry suitable for tight packing in an array with other parameters optimized to extract energy from the fluid flow. In addition, the turbines may be a more effective adaptation of a turbine, or an array of turbines, to varying conditions, including fluid conditions that may differ among different turbines in an array, or among different turbines in a set of arrays.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: September 28, 2010
    Assignee: V Squared Wind, Inc.
    Inventor: Robert M. Freda
  • Patent number: 7789624
    Abstract: The present invention is for an apparatus and method for a passive pitchable device for wind turbines comprising: a camshaft having cam grooves engraved; a cylindrical shell; an axial compression spring; said blade assembly and said cylindrical shell are fastened together by screws; a plurality of balls that roll along said cam grooves, and convert the axial displacement to rotation or pitch angle; and wherein the passive pitchable device ensures said blades are at the optimum angle of incidence in the stationary position; as the rotor turns, the net force between centrifugal force on said blade and the resistant force from said compression spring causes the device to move axially outward while rotating to adjust the pitch of the rotor blade so that angle of incidence is optimal for the given wind speed; as the wind speed exceeds the design speed and the centrifugal force on the rotor blade continues to increase, the device continues the move axially outward while rotating in the opposite direction as to adju
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: September 7, 2010
    Inventors: Kari Appa, Suri Appa
  • Publication number: 20100172759
    Abstract: A wind turbine electrical generating device is described where the blades that comprise the airfoil are retractable during operation. This feature allows for a number of improvements over the current state of the art including damage protection and the ability to remain operational during high wind conditions. Further described is a computer feedback loop that controls the degree of retraction. In addition, lightweight airfoil turbine blades are described that are assembled from discrete segments.
    Type: Application
    Filed: November 14, 2009
    Publication date: July 8, 2010
    Inventor: John T. Sullivan
  • Patent number: 7748947
    Abstract: A wind turbine for use in generating electricity. The wind turbine includes a housing being secured atop a tower. A wheel is mounted within the housing and is rotatable about a horizontal axis when struck by winds passing over the front of housing. The wheel has a hub and a number of paddles radiating outwardly from the hub and above the housing. An electrical current generator is connected to the wheel so as to be powered thereby. A wind shield is mounted within the housing for selectively preventing winds passing over the front of the housing from reaching the wheel.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: July 6, 2010
    Inventor: Dennis P. Caldwell
  • Publication number: 20100143118
    Abstract: The present application provides a wind turbine system. The wind turbine system may include a number of blades, a number of wind speed sensors positioned on the blades, a controller in communication with the wind speed sensors, and one or more performance adjustment, mechanisms in communication with the controller. The controller activates the performance adjustment mechanisms in response to the wind speed sensors.
    Type: Application
    Filed: July 10, 2009
    Publication date: June 10, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Eric Eggleston, Christopher Wolfe, Eric John Ruggiero, Alexander Simpson, Rodrigo Rodriguez-Erdmenger, Robbert Pannekeet
  • Publication number: 20100133817
    Abstract: A method for controlling a tip speed of a blade of a wind turbine. The method includes determining the wind speed proximate the wind turbine; maintaining a first substantially constant rotational speed of the tip of the blade during variable wind speeds above a first predetermined nominal wind speed and below the second predetermined nominal wind speed; maintaining a second substantially constant rotational speed of the tip of the blade during variable wind speeds above a second predetermined nominal wind speed. The noise generated by wind at the second predetermined nominal wind speed is greater than noise generated by the blade at the second constant rotational speed of the tip of the blade.
    Type: Application
    Filed: July 7, 2009
    Publication date: June 3, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Kevin Kinzie, Stefan Herr, Benoit Petitjean
  • Publication number: 20100129215
    Abstract: A system for providing dynamic pitch control in a wind turbine. In accordance with an embodiment, the dynamic pitch control uses a starting spring to pitch the blades of the wind turbine into a starting position that is suited for very low wind speeds. The pitch control then automatically pitches the blades into a run position as the rotation speed increases, using a combination of a rotational mass and a restraining spring. This allows the turbine to be started, and to generate power, at a much lower starting wind speed yet still operate at optimal speeds in its typical running range. In accordance with an embodiment, as the wind speed further increases beyond an overspeed limit, the rotational mass overcomes its restraining spring, and automatically pitches the blades back toward and beyond their start position, reducing the likelihood of damage to the turbine caused by high rotation speeds.
    Type: Application
    Filed: November 20, 2009
    Publication date: May 27, 2010
    Inventor: Robert W. Preus
  • Publication number: 20100092288
    Abstract: The present invention relates to a blade for a wind power plant with an assembly face for mounting in a circular pitch bearing, whose pitch axis is angled relative to the longitudinal axis of the blade, and wherein the blade comprises a root part with an approximately elliptic cross-section, in which root part the assembly face is arranged. The invention further relates to a wind power plant in general having a pitch-adjustable blade mounted in a pitch bearing such that the distance between the outermost part of the blade and the tower is increased when the leading edge of the blade is pitched up in the wind. This is accomplished in that the longitudinal axis of the blade is angled in a particular way compared to its pitch axis.
    Type: Application
    Filed: November 27, 2007
    Publication date: April 15, 2010
    Applicant: LM GLASFIBER A/S
    Inventor: Tommy Sorensen
  • Publication number: 20100092292
    Abstract: A wind turbine includes a machine nacelle and a rotor having at least one rotor blade and a hub. An anemometer unit is adapted for measuring a first wind velocity at a first rotational position of the rotor and for measuring at least one second wind velocity at at least one second rotational position of the rotor. At least one pitch angle adjustment unit is provided for adjusting a first pitch angle and at least one second pitch angle of the at least one rotor blade as a function of the rotational position of the rotor, wherein the at least one pitch angle adjustment unit is adapted for changing the pitch angle between the first pitch angle and the at least one second pitch angle while the rotor of the wind turbine is rotating.
    Type: Application
    Filed: October 10, 2008
    Publication date: April 15, 2010
    Inventors: Jacob Johannes Nies, Till Hoffmann
  • Publication number: 20100068058
    Abstract: The present invention relates to a blade (202) for a wind power plant (201) comprising a controllable actuator and at least one joint (206) transversally of the longitudinal direction of the blade, about which joint the outermost part (205) of the turning of the blade at an angle out of the original face of rotation of the blade can be controlled by the actuator. Hereby the rotor area can he controlled continuously during operation, and the distance between the blade tip and the tower can be increased/reduced. The turning and the bracing of the joint is controlled by means of wire pulls and/or actuators, such as eg electric, pneumatic or hydraulic pistons. The invention also relates to a method of improving the operation of a wind power plant in operation, using the same mechanism.
    Type: Application
    Filed: June 16, 2006
    Publication date: March 18, 2010
    Applicant: LM GLASFIBER A/S
    Inventor: Tommy Sørensen
  • Patent number: 7621480
    Abstract: A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system is attached to the counter-rotating, coaxial rotor system through a bearing arrangement such that the shaft fairing may be positioned at an azimuthal position about the main rotor axis of rotation relative the airframe by a de-rotation system. The de-rotation system controls the position of the shaft fairing about the axis of rotation such that the shaft fairing is prevented from rotating freely in unison with either shaft as may otherwise result during some flight regimes.
    Type: Grant
    Filed: May 12, 2006
    Date of Patent: November 24, 2009
    Assignee: Sikorsky Aircraft Corporation
    Inventors: David A. Darrow, Jr., Fabio P. Bertolotti, Thomas L. Sbabo, Frank P. D'Anna
  • Publication number: 20090284016
    Abstract: An apparatus and system for counteracting wind gusts and other high load situations in a wind turbine includes the use of one or more gust counteracting devices configured to extend an air deflector outwardly from a surface of a turbine rotor blade. The air deflector may subsequently be retracted into the rotor blade once the wind gust has subsided or once the load falls below a certain threshold. Mechanisms for extending and retracting the air deflector may include pneumatic or hydraulic systems and/or electromechanical devices. Air deflectors are generally configured to normalize air flow around the rotor blade so that the risk of potential damage to components of the wind turbine is minimized. In one arrangement, the gust counteracting device may be located at a leading section of the turbine blade. Additionally or alternatively, the device may be modular in nature to facilitate the removal and replacement of the device.
    Type: Application
    Filed: May 16, 2008
    Publication date: November 19, 2009
    Applicant: FRONTIER WIND, LLC
    Inventors: Cornelis P. van Dam, Kevin Lee Jackson
  • Patent number: 7607607
    Abstract: A de-rotation system includes a first ring gear defined about an axis of rotation, a second ring gear defined about the axis of rotation and a gear set in meshing engagement with the first ring gear and the second ring gear to control a position of a housing about the axis of rotation.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: October 27, 2009
    Assignee: Sikorsky Aircraft Corporation
    Inventors: David A. Darrow, Jr., Frank P. D'Anna, Thomas L. Sbabo
  • Patent number: 7581926
    Abstract: A power generating system wherein a turbine is mounted on top of a tower or tethered underwater. The turbine includes a rotor having a main blade connected to a rotor hub and an extender section. An adjusting device positions the extender blade between a retracted position within the main blade and to an extended position to expose more or less of the rotor to the fluid flow. The adjusting device includes a servo-controlled rack and pinion mechanism that converts rotation of the pinion by a servomotor into linear motion of the extender blade. A generator is connected to the turbine for generating electrical energy.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: September 1, 2009
    Assignee: Clipper Windpower Technology, Inc.
    Inventors: James G. P. Dehlsen, Amir S. Mikhail
  • Publication number: 20090212572
    Abstract: An apparatus for generating electrical power from a flow of water, including a housing having a water inlet and water outlet, a first turbine (12) mounted in the housing for rotation about a substantially vertical axis and having a turbine shaft, a set of vertical blades (22), and a blade angle control mechanism, a second turbine (14) mounted in the housing adjacent to the first turbine, for rotation about a substantially vertical axis, the second turbine having a turbine shaft, a set of vertical blades (22) and a blade angle control mechanism, the housing being adapted to be mounted within the body of water and being so configured that an incoming water flow enters the housing via the inlet, and is principally directed into two driving flows (34, 36), one for each turbine, and is then directed for discharge via the outlet, the angle of each blade with respect to the driving water flow is controlled by the blade angle control mechanism such that a large blade surface area is presented to the incoming water fl
    Type: Application
    Filed: July 5, 2006
    Publication date: August 27, 2009
    Applicant: SUNDERMANN WATER POWER LTD
    Inventor: Frederick Herman Sundermann
  • Publication number: 20090208334
    Abstract: A brake assembly for use with a wind turbine. The brake assembly comprises a movable wind flap for attachment to a tail assembly of the wind turbine, the wind flap being configured to assume a first closed position during normal operation, and a second open position when incoming winds exceed a predetermined velocity threshold. Provided on the wind flap is a trip rudder assembly for cooperating with incoming wind to urge the wind flap into the open position. A counterbalance assembly is also provided for biasing the wind flap into the closed position. The wind flap in the open position effects a redirection of a portion of the incoming wind, urging the wind turbine to assume an oblique position relative to the incoming wind, effecting a reduction in rotational velocity of the wind turbine.
    Type: Application
    Filed: June 30, 2008
    Publication date: August 20, 2009
    Applicant: WIND SIMPLICITY INC.
    Inventors: Sharolyn Vettese, Alfred Mathieu
  • Publication number: 20090129923
    Abstract: A device for holding a hydraulic turbomachine in position, the turbomachine comprising a drive shaft along which are distributed turbines designed to rotate the drive shaft when they are immersed in a moving liquid, each turbine comprising drive blades distributed around the drive shaft, the device comprising at least one post extending along at least more than half of the length of the drive shaft and formed of the stacking of at least two post portions, each Post portion being associated with a turbine or with an assembly of adjacent turbines; and a first linking mechanism attached to one of the post portions and to a bearing receiving the drive shaft and arranged between two adjacent turbines; and a second linking mechanism connecting at least one of the posts to the around by a rigid connection with respect to the ground along at least one axis parallel to the liquid motion direction.
    Type: Application
    Filed: February 14, 2006
    Publication date: May 21, 2009
    Inventors: Jean-Luc Achard, Didier Imbault, Thierry Maitre
  • Publication number: 20090110554
    Abstract: A wind driven turbine (2) has a plurality of sigmoid blades (6) with the trailing edge (56) of each blade (6) mounted parallel to a horizontally oriented shaft (4). Each blade (6) extends radially outward from the shaft (4). An electric generation system is composed of an array of the turbines (2) mounted on a platform (54) positioned on top of a tower (86). Each turbine shaft (4) may be connected directly with a generator (78) for producing electricity.
    Type: Application
    Filed: May 3, 2005
    Publication date: April 30, 2009
    Applicant: Wind Energy Group, Inc.
    Inventors: Adem D. Dukovic, Baichandra S. Pandya, Tomislav Stefanovic, Marvin A. Winegar
  • Publication number: 20090074573
    Abstract: A wind turbine having at least a blade comprising a first component (11) having an aerodynamic profile with a leading edge, a trailing edge and suction and pressure sides between the leading edge and the trailing edge, and a second component (13), attached to the trailing edge and/or to the leading edge of the first component (11) in at least a part of the blade, comprising one or several upwards and/or downwards deflectable flaps (15, 15?) that allow changing the flow over the blade, in which the means for deflecting each of said flaps (15, 15?) comprise an actuating force or torque provided by scaling devices (21) connected to a predetermined location (17) in the outer surface of the blade, through a duct (19), so that the changes in the wind pressure at said location (17) can be scaled to said actuating force or torque.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 19, 2009
    Inventors: Anders Rebsdorf, Christian Medgaard
  • Publication number: 20090074574
    Abstract: A wind turbine blade comprising an active elastic member arranged with access to the surface of the wind turbine blade is provided. The active elastic member is deformable from a first shape to a second shape and the lift coefficient of the airfoil with the active elastic member in the first shape is larger than the lift coefficient of the airfoil with the active elastic member in the second shape. Furthermore, a wind turbine comprising such a wind turbine blade and a method of operating a wind turbine comprising such a wind turbine blade are provided.
    Type: Application
    Filed: October 17, 2005
    Publication date: March 19, 2009
    Inventors: Kristian Balschmidt Godsk, Thomas S. Bjertrup Nielsen
  • Publication number: 20090060740
    Abstract: The invention concerns a method of operating a wind turbine, wherein for a reduction of a wind load impacting on the wind turbine the rotational speed of the rotor and/or the electrical power output of the wind turbine are reduced depending on a deviation of the wind speed from the average wind speed. Moreover the invention concerns a wind turbine comprising a calculating unit adjusted for executing the inventive method.
    Type: Application
    Filed: May 1, 2008
    Publication date: March 5, 2009
    Inventors: Henrik Stiesdal, Martin Winther-Jensen
  • Patent number: 7487673
    Abstract: A method for ice detection for a wind turbine is provided. The method includes providing an ice condition threshold parameter adapted for distinguishing a condition during which icing may occur and a condition during which icing may not occur, measuring a wind velocity with a first anemometer, wherein the first anemometer being of a first type, measuring a wind velocity with a second anemometer, wherein the second anemometer being of a second type, and wherein the second type is different from the first type, evaluating, for a condition during which icing may occur, a deviation of the wind velocity measured with the first anemometer and the wind velocity measured with the second anemometer, and determine whether the deviation exceeds a limit value based on a calibration conducted under a condition during which icing may not occur.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: February 10, 2009
    Assignee: General Electric Company
    Inventors: Frank Ormel, Thorsten Honekamp, Christian Hoffrogge
  • Publication number: 20090028706
    Abstract: VAHM has a rotor helix type, vertical axle, omni directional foil, which incorporates a 3 helix monoblock blade which transforms wind energy into electrical energy, via stand alone batteries. Rotor movement begins at a 2-3 m/s wind speed and provides a self-braking momentum at over 20 m/s wind speed.
    Type: Application
    Filed: July 23, 2008
    Publication date: January 29, 2009
    Inventors: STEFAN IOANA, Nicolae Mugea
  • Publication number: 20090022589
    Abstract: A method of adjusting the speed of blades rotating in a rotor plane on a wind turbine, wherein the angle between at least two blades in the rotor plane is changed, whereby the tip speed of each individual blade can be optimised relative to the current speed of the wind experienced by the blade. Hereby it is possible to take into consideration the variation of the wind as a function of the height above ground level, and the yield of the wind turbine can be increased. The angular displacement of each blade can be changed individually independently of the remainder of the blades and cyclically. The method also comprises that each blade is accelerated on its way upwards in the rotation cycle and decelerated on its way down. Further details are provided about a system for controlling blades in a wind turbine comprising one or more wind speed meters, position meters, and/or acceleration meters, based on which parameters control of the angular displacement of each blade in the rotor plane is performed.
    Type: Application
    Filed: December 28, 2006
    Publication date: January 22, 2009
    Inventor: Tommy Sorensen
  • Publication number: 20090008939
    Abstract: A modular multi-turbine unit of fixed toroidal support structures having a rail system designed to allow each of the plurality of turbines to rotate to a most efficient position relative to the wind for generating power, a computer control system capable of positioning each of the plurality of turbines to most effectively generate power from the wind, preventing damage to the turbines, and providing a wind predictive model based on the wind characteristics for the area in which the wind turbine is located.
    Type: Application
    Filed: July 2, 2008
    Publication date: January 8, 2009
    Applicant: KKR IP Limited Liability Company
    Inventors: Karen Anne Pare, Kelly William Lowther, Philip Roger Pare, Jesse Anthony Lowther
  • Publication number: 20080304964
    Abstract: To provide a horizontal axis wind turbine capable of reducing flutter, and by extension, reducing the load on the wind turbine, without controlling the yaw, regardless of the direction of the wind relative to the nacelle. When the wind speed is above a specific value, the yaw angle of the nacelle is held constant, the blade pitch angle is controlled according to the yaw angle Y of the wind direction relative to the nacelle, and the rotor is allowed to rotate freely. Even when the yaw angle of the nacelle is held constant, allowing the rotor to rotate freely makes it possible to reduce the load by avoiding flutter.
    Type: Application
    Filed: June 4, 2008
    Publication date: December 11, 2008
    Applicant: FUJI JUKOGYO KABUSHIKI KAISHA
    Inventor: Shigeo YOSHIDA
  • Publication number: 20080298965
    Abstract: The Wind Drum is a cylinder shaped wind utilization machine primarily used for electricity generation. Instead of a solid wall attaching the top and bottom circular plates are eight rods spaced equally around the circumference of the top and bottom circular plates. Now you have a drum shape you can see through from the elongated side. Attached to these rods are boards, or flat rectangular pieces, which make-up the vanes of the Wind Drum. Through mechanical manipulation of the angles of the eight vanes compared to the center, or pivotal spot, of the top and bottom circular plates the vanes are positioned so as to be pushed by wind energy, directing wind energy into other vanes of the Wind Drum, or to become neutral to wind energy allowing minimal resistance to wind energy. These changes of the wind vane angles allows for maximum efficiency in converting wind energy into mechanical energy.
    Type: Application
    Filed: May 6, 2008
    Publication date: December 4, 2008
    Inventor: Michael Alan Keena
  • Publication number: 20080247872
    Abstract: Operations of a turbine to generate energy from a relatively slow fluid flow, such as wind and water, are described. The turbine has a plurality of foils rotating about a central axis at a rotational velocity, each of the foils having a length and a foil axis parallel to the length and the central axis with each of the foils rotatable about its foil axis. From determinations of a velocity of the fluid flow, and angular location of each foil and the rotational velocity about the central axis, an attack angle of each foil is controlled with respect to the direction of fluid flow about the foil axis responsive to the velocity of the fluid flow, the angular location of the foil and the rotational velocity as the foil rotates about the central axis.
    Type: Application
    Filed: January 22, 2008
    Publication date: October 9, 2008
    Applicant: LONESTAR INVENTIONS LP
    Inventor: Osman Ersed Akcasu
  • Publication number: 20080206051
    Abstract: A wind turbine generator, an active damping method thereof, and a windmill tower in which vibrations of the wind turbine generator itself or the windmill tower can be reduced at low cost are provided. The acceleration due to vibrations of a nacelle (13) is detected with an accelerometer (17) attached to the nacelle (13). In an active damping unit (20), a pitch angle of windmill blades (12) for generating a thrust on the windmill blades (12) so as to cancel out the vibrations of the nacelle (13) is calculated on the basis of the acceleration, and the pitch angle is output as a blade-pitch-angle command ??* for damping. On the other hand, in a pitch-angle control unit (30), a pitch angle of the windmill blades (12) for controlling the output to be a predetermined value is calculated, and the pitch angle is output as a blade-pitch-angle command ?* for output control. The blade-pitch-angle command ??* for damping is combined with the blade-pitch-angle command ?* for output control using a subtracter (40).
    Type: Application
    Filed: November 12, 2004
    Publication date: August 28, 2008
    Inventors: Tsuyoshi Wakasa, Kazunari Ide, Yoshiyuki Hayashi, Masaaki Shibata
  • Publication number: 20080152493
    Abstract: A method and system for detecting asymmetric utilizing lateral tower acceleration data may include: providing a lateral tower acceleration monitoring system; determining from the lateral tower acceleration monitoring system whether a lateral tower acceleration is above an acceleration limit; determining whether a rotor-mass imbalance condition exists; and determining whether the lateral tower acceleration coincides with icing on a rotor.
    Type: Application
    Filed: December 21, 2006
    Publication date: June 26, 2008
    Inventors: Bastian Sundermann, Christian Siuts, Hubert Oing
  • Patent number: 7322794
    Abstract: Condition-based monitoring functionality using sensors that monitor wind turbine component movement. A main shaft flange displacement sensor system can be used to provide signals used to perform fatigue assessment of the wind turbine rotor blades as well as drive train components. Output signals from the main shaft flange displacement sensor system are used to perform fatigue assessment, failure trending, diagnostic analysis, etc.
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: January 29, 2008
    Assignee: General Electric Company
    Inventors: David L. LeMieux, Emil M Moroz
  • Patent number: 7293959
    Abstract: Wind turbine blade (10) including adjustable lift-regulating means (12, 13, 15, 17, 19, 21) arranged on or at the surface of the wind turbine blade (10), said lift-regulating means being provided with activating means by means of which they can be adjusted and thus alter the aerodynamic properties of the blade (10). The lift-regulating means (12, 13, 15, 17, 19, 21) and the activating means are adapted and arranged such that by activation of the activating means, the lift can be reduced in a zone extending in the longitudinal direction of the blade (10) from a first position adjacent the blade tip (14) to a second position between the position and the blade root (16) and this second position is variable in the longitudinal direction of the blade (10) by adjusting activate means. The lift-regulating means are formed of at least one flexible flap (12, 13, 15, 17, 19, 21).
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: November 13, 2007
    Assignee: LM Glasfibeer A/S
    Inventors: Bernt Ebbe Pedersen, Jørgen Dahl Vestergaard, Peter Grabau, Ib Frydendal
  • Patent number: 7281891
    Abstract: A wind turbine is provided having a lidar wind speed measurement apparatus for achieving wind control. The lidar apparatus is arranged to scan the area in front of the wind turbine so as to generate a measurement of the wind speed across the wind field. The lidar apparatus may be located in the hub of the wind turbine and the look direction inclined away from the rotational axis so that rotation of the hub ensures scanning. Preferably the lidar apparatus has a plurality of look directions so as to increase the scanning rate. This may be achieved by having a number of dedicated lidar systems and/or by using multiplexed lidars. Measurement of the wind field allows improved control of the wind turbine giving efficiency and reduced wear benefits.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: October 16, 2007
    Assignee: Qinetiq Limited
    Inventors: David A Smith, Michael Harris
  • Patent number: 7258527
    Abstract: The present invention is to provide a vertical axis wind engine comprising at least one arm each having its center rotatably coupled to a vertical axis mounted on a base on the ground, each pair of the upper and lower arms adapted to define an airfoil receiving space for pivotably mounting an airfoil by pivot pins thereof; and at least one elastic stop member each provided on the arm proximate the airfoil and spaced from the pivot pins, each stop member adapted to limit a pivot angle of the airfoil and lift the pivot limitation for allowing the airfoil to pivot when the airfoil experiences a wind force larger than a maximum resistance force thereof, preventing the components of the wind engine from being damaged by strong wind or when the wind engine is operating in high speed.
    Type: Grant
    Filed: December 28, 2004
    Date of Patent: August 21, 2007
    Inventor: Chi-Kuang Shih
  • Patent number: 7244100
    Abstract: A horizontal axis wind turbine of an upwind type includes: a rotor for rotating around a rotor axis extending in a horizontal direction, the rotor being turned in a horizontal plane according to a wind direction; a nacelle having a symmetrical shape with respect to an imaginary plane including the rotor axis and extending a vertical direction; two anemometers disposed at positions of both side portions of the nacelle, the positions opposing each other across the imaginary plane; and a controller for controlling a yaw angle of the rotor based on wind speeds measured by the two anemometers.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: July 17, 2007
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventor: Shigeo Yoshida
  • Patent number: 7220107
    Abstract: The present invention relates to a windmill device rotating by a wind power. More particularly, to efficiently obtain rotating energy irrespective of a wind direction, the present invention is firstly characterized in that assuming that an outermost radius as a distance between the remotest position of each blade from the center of a vertical shaft and the vertical shaft is r1, an innermost radius as a distance between the nearest position of each blade to the vertical shaft and the vertical shaft is r2, and the angle (rad) of an arbitrary position r in an inner peripheral surface of the cross-section of the blade by regarding a line segment for connecting the remotest position from the vertical shaft to the vertical shaft as a reference is t (in this case, 0<=t<=2?/3), the form of the inner peripheral surface in the cross-section of each of the three blades satisfies a following formula: r=(r1?r2)×((t?2?/3)×2)/(2?/3)×2+r2.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: May 22, 2007
    Inventor: Fumiro Kaneda