Patents by Inventor Ralf Harder

Ralf Harder 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).

  • Method for the operation of a wind energy plant with voltage-dependent control of a reactive electric variable which is to be provided
    Patent number: 7638984
    Abstract: A method for the operation of a wind energy plant, with control of a reactive electric variable which is to be provided, wherein a desired value for the reactive electric variable is determined as follows: a first upper and/or a first lower limit value of the grid voltage is defined for the grid voltage, when the real value of the grid voltage exceeds the first upper limit value and/or the real value of the grid voltage falls below the first lower limit value, the desired value of the reactive electric variable is increased or diminished such that the deviation of the real value of the grid voltage from its desired value is counter-acted, wherein the desired value of the reactive electric variable is continuously increased or diminished further over the time, as long as the real value of the grid voltage exceeds the first upper limit value or falls below the first lower limit value.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: December 29, 2009
    Assignee: Nordex Energy GmbH
    Inventors: Mark Jurkat, Kay Richter, Ralf Harder
  • METHOD FOR THE OPERATION OF A WIND ENERGY PLANT WITH VOLTAGE-DEPENDENT CONTROL OF A REACTIVE ELECTRIC VARIABLE WHICH IS TO BE PROVIDED
    Publication number: 20090140704
    Abstract: A method for the operation of a wind energy plant, with control of a reactive electric variable which is to be provided, wherein a desired value for the reactive electric variable is determined as follows: a first upper and/or a first lower limit value of the grid voltage is defined for the grid voltage, when the real value of the grid voltage exceeds the first upper limit value and/or the real value of the grid voltage falls below the first lower limit value, the desired value of the reactive electric variable is increased or diminished such that the deviation of the real value of the grid voltage from its desired value is counter-acted, wherein the desired value of the reactive electric variable is continuously increased or diminished further over the time, as long as the real value of the grid voltage exceeds the first upper limit value or falls below the first lower limit value.
    Type: Application
    Filed: April 14, 2008
    Publication date: June 4, 2009
    Applicant: Nordex Energy GmbH
    Inventors: Mark Jurkat, Kay Richter, Ralf Harder