Patents by Inventor Leonard Schaier

Leonard Schaier 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).

  • Variable speed wind turbine with a doubly-fed induction generator and rotor and grid inverters that use scalar controls
    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
  • Apparatus and method for controlling the reactive power from a cluster of wind turbines connected to a utility grid
    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
  • Apparatus and method for operating a wind turbine under low utility grid voltage conditions
    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
  • APPARATUS AND METHOD FOR OPERATING A WIND TURBINE UNDER LOW UTILITY GRID VOLTAGE CONDITIONS
    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
  • APPARATUS AND METHOD FOR CONTROLLING THE REACTIVE POWER FROM A CLUSTER OF WIND TURBINES CONNECTED TO A UTILITY GRID
    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
  • Variable Speed Wind Turbine Configured For Wind Farm Operation
    Publication number: 20090206606
    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: Application
    Filed: December 16, 2008
    Publication date: August 20, 2009
    Applicant: Vestas Wind Systems A/S
    Inventors: Allan Holm Jorgensen, Lars Helle, Leonard Schaier