Patents by Inventor Ulf Radbrandt

Ulf Radbrandt 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 and arrangement to reverse the power flow of a direct current power transmission system
    Patent number: 8203856
    Abstract: A direct current power transmission system includes a first and a second converter station that are coupled to each other via a direct current link. Each converter station includes a first or second line commutated converter, respectively. Before power reversal the first converter is operated as a rectifier and the direct current is controlled in the first station, while the second converter is operated as an inverter and in the second station the extinction angle of the second converter or the direct voltage is controlled. After power reversal, the first converter is operated as an inverter and the second converter as a rectifier.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: June 19, 2012
    Assignee: ABB Technology AG
    Inventor: Ulf Radbrandt
  • METHOD AND ARRANGEMENT TO REVERSE THE POWER FLOW OF A DIRECT CURRENT POWER TRANSMISSION SYSTEM
    Publication number: 20100091528
    Abstract: A direct current power transmission system includes a first and a second converter station that are coupled to each other via a direct current link. Each converter station includes a first or second line commutated converter, respectively. Before power reversal the first converter is operated as a rectifier and the direct current is controlled in the first station, while the second converter is operated as an inverter and in the second station the extinction angle of the second converter or the direct voltage is controlled. After power reversal, the first converter is operated as an inverter and the second converter as a rectifier.
    Type: Application
    Filed: March 15, 2007
    Publication date: April 15, 2010
    Applicant: ABB TECHNOLOGY AG
    Inventor: Ulf Radbrandt