Patents by Inventor Karl Friedrich Stapelfeldt

Karl Friedrich Stapelfeldt 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: 9026258
    Abstract: In order to specify a method for the regulation of a wind park (1) comprised of a multiplicity of wind energy installations (WT1, . . . , WT9), wherein the wind park (1) is connected to an electric utility grid (12) into which the electric power generated by the wind park (1) is fed, and the wind park (1) includes a control input (13) by means of which nominal controlled variables (15, 16) of the wind park (1) can be set, which can be adapted to highly different wind park topologies using the least possible adaptation expenditures, which permits the addition or removal of wind energy installations to or from the wind park with minimal adaptation expenditures, which is utilizable without a measurement of the park network data at the grid transfer point and which, moreover, allows the integration of wind energy installations by different manufacturers into a wind park, it is proposed that each wind energy installation (WT1, . . .
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: May 5, 2015
    Assignee: DeWind Co.
    Inventor: Karl Friedrich Stapelfeldt
  • Publication number: 20120104754
    Abstract: Systems and methods (“utility”) for providing Low Voltage Ride Through (LVRT) capabilities for wind turbines are disclosed. The utility includes a directly connected synchronous generator (214) that is designed to have a high dynamic pull-out torque. To remain connected to the power grid (224) during low voltage events, the utility boosts the excitation current applied to the rotor of the synchronous generator (214). Further, the utility may include a torque regulator in the form of d torque-regulating gearbox (210), which in turn includes adjustable guide vanes (624) that may be positioned to reduce the amount of mechanical torque applied to the rotor shaft of the synchronous generator (224) during low voltage events. Additionally, the utility may also include a braking system (206) and a pitch control system (234) to limit the acceleration of the wind rotor (202) shaft during low voltage events.
    Type: Application
    Filed: April 30, 2009
    Publication date: May 3, 2012
    Inventors: Georg Rudolf, Karl-Friedrich Stapelfeldt
  • Publication number: 20120101640
    Abstract: Systems and methods are provided herein for configuring and/or operating a wind turbine to adaptively control a voltage of a power grid. In one or more embodiments, a method and system for recognizing a condition of a power grid (e.g., fluctuations caused by variable consumer loads on a weak grid), and adaptively adjusting a voltage control scheme to “ignore” voltage changes caused by the condition are provided. Additionally, other features of the present invention includes a voltage control with active power derating for wind turbines and power factor control with active power derating for wind turbines. The active power derating features of the present invention may be dependent upon physical characteristics of a synchronous generator associated with the wind turbine.
    Type: Application
    Filed: April 30, 2009
    Publication date: April 26, 2012
    Applicant: DEWIND CO.
    Inventor: Karl-Friedrich Stapelfeldt
  • Publication number: 20120010755
    Abstract: In order to specify a method for the regulation of a wind park (1) comprised of a multiplicity of wind energy installations (WT1, . . . , WT9), wherein the wind park (1) is connected to an electric utility grid (12) into which the electric power generated by the wind park (1) is fed, and the wind park (1) includes a control input (13) by means of which nominal controlled variables (15, 16) of the wind park (1) can be set, which can be adapted to highly different wind park topologies using the least possible adaptation expenditures, which permits the addition or removal of wind energy installations to or from the wind park with minimal adaptation expenditures, which is utilizable without a measurement of the park network data at the grid transfer point and which, moreover, allows the integration of wind energy installations by different manufacturers into a wind park, it is proposed that each wind energy installation (WT1, . . .
    Type: Application
    Filed: August 21, 2009
    Publication date: January 12, 2012
    Inventor: Karl Friedrich Stapelfeldt