Patents by Inventor Boris Nordstrom

Boris Nordstrom 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).

  • Control equipment for active filters and a method for reduction of harmonics in a bipolar dc link
    Patent number: 6115269
    Abstract: A bipolar converter station for conversion between alternating current and high-voltage direct current comprises a first and a second active filter (AF11, AF12), each with its own piece of control equipment (CE11, CE12). The filters are intended for reduction of harmonics in a dc link, connected to the converter station, with a first and a second pole line (PC1, PC2), and each filter generates, in dependence on a sum of harmonic currents in the respective pole line, an influencing quantity (IF11, IF12) and supplies this to the dc link. The control equipment comprises frequency-selecting means (BP, CTR) which influence the frequency content of the respective influencing quantity to lie substantially within one of a first and a second of at least two predetermined, mutually non-overlapping frequency bands (FR1, FR2).
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: September 5, 2000
    Assignee: ABB AB
    Inventors: Stefan Gunnarsson, Boris Nordstrom