Patents by Inventor Lars Helle

Lars Helle has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20130147442
    Abstract: A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.
    Type: Application
    Filed: August 28, 2009
    Publication date: June 13, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Anshuman Tripathi, Cao Shu Yu, Allan Holm Jörgensen, Lars Helle, Saurabh Gupta
  • Patent number: 8395360
    Abstract: A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: March 12, 2013
    Assignee: Vestas Wind Systems A/S
    Inventors: Anshuman Tripathi, Cao Shu Yu, Allan Holm Jörgensen, Lars Helle, Saurabh Gupta
  • Patent number: 8365391
    Abstract: A method for establishing a wind turbine generator with one or more Permanent Magnet (PM) rotors. The method comprises the steps of: manufacturing a generator prepared for taking one or more PM rotors, manufacturing one or more rotors comprising a plurality of holding means prepared for retaining PM material, mounting substantially non-magnetized PM material prepared for magnetization in said holding means before or after said one or more rotors are mounted in said generator, connecting a magnetization system for magnetizing said PM material in the generator, and magnetizing said PM material with said magnetization system. The invention also relates to a wind turbine nacelle, a wind turbine comprising said wind turbine nacelle and use of a wind turbine.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: February 5, 2013
    Assignee: Vestas Wind Systems A/S
    Inventors: Lars Helle, Philip Richard Jacobsen Carne Kjaer, Morten Lindholm, Flemming Buus Bendixen, Ion Boldea
  • Publication number: 20130010505
    Abstract: A method for controlling a power converter in a wind turbine generator, the power converter being connected to a power grid, the method comprising obtaining an alternating current (AC) line voltage at a connection point between the power converter and the power grid, obtaining a frequency of the power grid based on the AC line voltage, dynamically adapting the AC line voltage to the frequency of the power grid, generating a reference signal based on at least the frequency-adapted AC line voltage, and determining a converter control signal to be provided to the power converter based on the reference signal and the grid frequency in order to generate a power at the frequency of the power grid. Further, a wind turbine generator implementing the method is provided.
    Type: Application
    Filed: September 20, 2010
    Publication date: January 10, 2013
    Inventors: Yin Bo, Heng Deng, Kim B. Larsen, Lars Helle, Mogens Lau
  • Publication number: 20130009611
    Abstract: A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.
    Type: Application
    Filed: October 27, 2009
    Publication date: January 10, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Anshuman Tripathi, Lars Helle, Allan Holm Jörgensen, Cao Shu Yu, Saurabh Gupta
  • Publication number: 20120268081
    Abstract: A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.
    Type: Application
    Filed: October 14, 2011
    Publication date: October 25, 2012
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Anshuman Tripathi, Cao Shu Yu, Allan Holm Jorgensen, Lars Helle, Saurabh Gupta
  • Publication number: 20120217747
    Abstract: A method of controlling a wind turbine generator is provided, the wind turbine generator converting mechanical energy to electrical. The method comprises: determining an electromagnetic power reference representing the electromagnetic power generated by the wind turbine generator, wherein the electromagnetic power reference is determined based on a desired output of the wind turbine generator; controlling the electrical power generated by the wind turbine generator using a control signal, wherein the control signal is derived from the electromagnetic power reference and is modified in dependence on an inverse power function of the wind turbine generator by incorporating minimal copper loss constraint and stator voltage limiting constraint such that non-linearity of the wind turbine generator plant is compensated in the control loop and it operates at its maximum efficiency. One effect of the method is that classical linear control loop design can be employed in spite of the plant being a non-linear identity.
    Type: Application
    Filed: September 14, 2010
    Publication date: August 30, 2012
    Inventors: Shu Yu Cao, Anshuman Tripathi, Kim B. Larsen, Gert Karmisholt Andersen, Lars Helle
  • Patent number: 8198742
    Abstract: The present invention relates to an improved wind turbine, of the type which employs doubly fed induction generators (DFIG), and a wind park including the same, which permits the use of lighter weight turbines, with the ability to have greater energy capture, more precise control of asymmetrical phases and enhanced maintenance and support of the grid during fault conditions.
    Type: Grant
    Filed: December 16, 2008
    Date of Patent: June 12, 2012
    Assignee: Vestas Wind Systems A/S
    Inventors: Allan Holm Jørgensen, Lars Helle, Leonard Schaier
  • Publication number: 20120055652
    Abstract: The invention relates to a fail-safe rotary actuator (1) for a coolant circuit, in particular for a coolant circuit of an internal combustion engine (2) having a plurality of sub-circuits (3) and (4), includes a coolant delivery pump (5) for circulating the coolant within the coolant circuit, and having a rotary-slide housing (8) which has a plurality of housing pass-through openings (6) and (7) and in which at least one rotary slide (9) having at least one rotary slide pass-through opening (11) and (12) is rotatably supported, wherein the housing pass-through openings (6) and/or (7) are fluidly connected to at least one sub-circuit (3) and/or (4), and can be brought into at least partial coincidence with the rotary slide pass-through openings (11) and/or (12) by a rotary motion of the rotary slide (9), wherein a thermostat valve (13) opens a flow path running parallel to the rotary slide (9) from one of the sub-circuits (3) or (4) to the coolant delivery pump (5), when a temperature limit of the coolant is e
    Type: Application
    Filed: May 4, 2010
    Publication date: March 8, 2012
    Applicant: Audi AG
    Inventors: Steffen Triebe, Michael Staiger, Lars Helling, Dieter Lachner
  • Publication number: 20120038167
    Abstract: The present invention relates to a reconfigurable power converter module for a wind turbine facility adapted to supply electric power to an associated power supply grid. The reconfigurable power converter module comprises a frequency converter operatively connected to filter means, wherein said frequency converter and said filter means are mutually reconfigurable so as to suppress internal and/or internal resonances/harmonics.
    Type: Application
    Filed: January 12, 2010
    Publication date: February 16, 2012
    Inventors: Philip Carne Kjaer, Lars Helle
  • Patent number: 8049352
    Abstract: Methods for increasing a total reactive power capability of a cluster of wind turbines operationally connected to a grid and systems for carrying out the methods. The method includes generating a voltage value representative of a grid voltage level, determining a total required reactive power value based on the voltage value, and activating at least one wind turbine in said cluster to increase the total reactive power capability from a present value to the required total reactive power value by a predetermined amount.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: November 1, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Allan Holm Jørgensen, Lars Helle, Leonard Schaier
  • Patent number: 8041466
    Abstract: The invention relates to a method for operating a wind turbine connected to a utility grid during a utility grid disturbance. The method comprises the steps of controlling active current in dependency of the frequency deviation from a reference frequency, and controlling reactive current in dependency of the voltage deviation from a reference voltage. The invention also relates to a wind turbine and wind park.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: October 18, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Lars Helle, John Godsk Nielsen, Mark James Jensen
  • Publication number: 20110248565
    Abstract: A method for providing dynamic load sharing between a first and a second three phase system is disclosed, wherein the first and second three phase system are connected to a first and second three phase interleaved winding in a generator. The method comprises determining a first q-axis control signal for the first three phase system and a second q-axis control signal for the second three phase system based on a torque and/or power demand for the generator, determining a first d-axis control signal for the first three phase system and a second d-axis control signal for the second three phase system based on a coupling effect between the first and second three phase systems, and adjusting the q-axis control signals and d-axis control signals by including at least one feed forward compensation signal, wherein said at least one feed forward compensation signal is based on a coupling effect between the first and second three phase systems.
    Type: Application
    Filed: September 25, 2009
    Publication date: October 13, 2011
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Lars Helle, Kim B. Larsen, Anshuman Tripathi, Shu Yu Cao
  • Publication number: 20110204738
    Abstract: A method for estimating the magnetization level of one or more permanent magnets established in one or more permanent magnet rotors of a wind turbine generator includes the steps of: establishing one or more magnetization sensors at the stator of the generator, connecting the one or more magnetization sensors to a measuring mechanism, processing measured data in the measuring mechanism, and establishing values of magnetization. Furthermore the invention also relates to a wind turbine.
    Type: Application
    Filed: April 26, 2011
    Publication date: August 25, 2011
    Applicant: Vestas Wind Systems A/S
    Inventors: Lars Helle, Morten Lindholm, Flemming Buus Bendixen
  • Patent number: 7966103
    Abstract: A wind turbine and an associated method for controlling the output current from the wind turbine to an electric power grid and including the wind turbine and the method for controlling the current under conditions of grid voltage variations due to changing grid conditions as in the case when the wind turbine experiences and recovers from a fault.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: June 21, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Allan Holm Jørgensen, Lars Helle, Leonard Schaier
  • Patent number: 7952346
    Abstract: A method for estimating the magnetization level of one or more permanent magnets established in one or more permanent magnet rotors of a wind turbine generator includes the steps of: establishing one or more magnetization sensors at the stator of the generator, connecting the one or more magnetization sensors to a measuring mechanism, processing measured data in the measuring mechanism, and establishing values of magnetization. Furthermore the invention also relates to a wind turbine.
    Type: Grant
    Filed: September 23, 2009
    Date of Patent: May 31, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Lars Helle, Morten Lindholm, Flemming Buus Bendixen
  • Patent number: 7915762
    Abstract: A method for controlling a cluster of wind turbines connected to a utility grid includes the steps of determining the frequency of the utility grid, detecting a frequency deviation in the utility grid, and disconnecting the wind turbines at different predefined frequency values above the nominal frequency value. The invention also relates to a method for planning the strategy of a utility grid including a wind turbine cluster connected to the grid and a wind turbine cluster.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: March 29, 2011
    Assignee: Vestas Wind Systems A/S
    Inventors: Lars Helle, John Godsk Nielsen
  • Publication number: 20110049903
    Abstract: The present invention relates to a wind turbine and an associated method for controlling the output current from said wind turbine to an electric power grid, and, more particularly, to a wind turbine and a method for controlling the current under conditions of grid voltage variations due to changing grid conditions as in the case for example when a wind turbine experiences and recovers from a fault.
    Type: Application
    Filed: December 17, 2008
    Publication date: March 3, 2011
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Allan Holm Jørgensen, Lars Helle, Leonard Schaier
  • Publication number: 20110025059
    Abstract: A method for operating a wind turbine facility during for example a grid fault, the wind turbine facility comprising a power dissipation/storage being adapted to dissipate or store electrical energy exceeding an amount to be delivered to an associated power supply grid during the grid fault. The method includes operating the wind turbine facility in accordance with an allowed amount of electrical energy that can be dissipated or stored in the power dissipation/storage of the wind turbine facility by ensuring that a total amount of electrical energy generated by the wind turbine facility does not exceed a sum of the allowed amount and the amount to be delivered to the power supply grid.
    Type: Application
    Filed: June 30, 2010
    Publication date: February 3, 2011
    Applicant: Vestas Wind Systems A/S
    Inventors: Lars Helle, Thomas Hjort, Thomas Lundgren Andersen
  • Publication number: 20100308585
    Abstract: The present invention relates to a method for increasing a total reactive power capability of a cluster of wind turbines operationally connected to a grid. The method comprises the steps of generating a voltage value representative of a grid voltage level, determining a total required reactive power value based on the voltage value, and activating at least one wind turbine in said cluster to increase the total reactive power capability from a present value to the required total reactive power value by a predetermined amount. Moreover, the present invention relates to a system suitable for carrying out the before-mentioned method.
    Type: Application
    Filed: December 17, 2008
    Publication date: December 9, 2010
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Allan Holm Jorgensen, Lars Helle, Leonard Schaier