Patents by Inventor John Godsk Nielsen

John Godsk Nielsen 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).

  • 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
  • Patent number: 7859125
    Abstract: Method of controlling a wind turbine connected to an electric utility grid during malfunction in the electric utility grid is provided. The method includes the steps of detecting a malfunction in the electric utility grid and operating at least two control units of a power converter in relation to at least one power converter limit value. A control system for a wind turbine connected to a utility grid and a wind turbine is also provided.
    Type: Grant
    Filed: December 28, 2004
    Date of Patent: December 28, 2010
    Assignee: Vestas Wind Systems A/S
    Inventors: John Godsk Nielsen, Claus Esbensen
  • Publication number: 20090254223
    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: Application
    Filed: April 2, 2009
    Publication date: October 8, 2009
    Inventors: Lars Helle, John Godsk Nielsen, Mark James Jensen
  • Publication number: 20090234510
    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. A method for planning the strategy of a utility grid including a wind turbine cluster connected to the grid and a wind turbine cluster is also contemplated.
    Type: Application
    Filed: May 7, 2009
    Publication date: September 17, 2009
    Inventors: Lars HELLE, John Godsk NIELSEN
  • Publication number: 20090079193
    Abstract: The invention relates to a method of controlling a wind turbine connected to an electric utility grid during malfunction in said electric utility grid (9). The method comprises the steps of detecting a malfunction in said electric utility grid and operating at least two control units of said power converter (12) in relation to at least one power converter limit value. The invention also relates to a control system for a wind turbine connected to a utility grid and a wind turbine.
    Type: Application
    Filed: December 28, 2004
    Publication date: March 26, 2009
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: John Godsk Nielsen, Claus Esbensen
  • Patent number: 7332827
    Abstract: The present invention relates to a method and an apparatus for controlling a power-grid connected wind turbine generator during grid faults. During grid faults, the stator windings of the wind turbine generator are disconnected from the power grid and impedances for dissipating at least part of the power generated by the wind turbine during grid fault condition are connected to the stator windings. In this way, a certain magnetisation of the generator can be maintained and after removal of the grid fault condition, the generator is synchronised to the power grid and the impedances are disconnected and the stator windings are reconnected to the power grid. In this way, it is possible to keep the wind turbine generator at least partly magnetised during grid faults and thus ready for delivering power to the power grid, as soon as the grid voltage is re-established after the fault.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: February 19, 2008
    Assignee: Vestas Wind Systems A/S
    Inventor: John Godsk Nielsen