Patents by Inventor Nikolaos OIKONOMOU

Nikolaos OIKONOMOU 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: 9831760
    Abstract: An electrical converter is interconnected via a filter with an electrical load or an electrical power source.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: November 28, 2017
    Assignee: ABB Schweiz AG
    Inventors: Peter Al-Hokayem, Tobias Geyer, Nikolaos Oikonomou
  • Patent number: 9806595
    Abstract: A method for controlling an electrical converter comprises the acts of determining an error value based on a difference between an estimated output value and a reference output value, the estimated output value being based on measurements in the electrical converter; comparing the error value with an error band and in the case of the error value exceeds the error band, controlling the electrical converter by switching to a different control scheme. The converter is controlled with the modified pre-calculated switching by determining a pre-calculated switching sequence for the converter based on an actual state of the electrical converter, the switching sequence comprising a sequence of switching transitions of the converter; modifying the pre-calculated switching sequence by modifying transition times of switching transitions of the pre-calculated switching sequence, such that the error value is minimized; and applying at least a part of the modified switching sequence to the electrical converter.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: October 31, 2017
    Assignee: ABB Schweiz AG
    Inventors: Tobias Geyer, Nikolaos Oikonomou, Georgios Papafotiou
  • Publication number: 20160276919
    Abstract: A method for controlling an electrical converter comprises the acts of determining an error value based on a difference between an estimated output value and a reference output value, the estimated output value being based on measurements in the electrical converter; comparing the error value with an error band and in the case of the error value exceeds the error band, controlling the electrical converter by switching to a different control scheme. The converter is controlled with the modified pre-calculated switching by determining a pre-calculated switching sequence for the converter based on an actual state of the electrical converter, the switching sequence comprising a sequence of switching transitions of the converter; modifying the pre-calculated switching sequence by modifying transition times of switching transitions of the pre-calculated switching sequence, such that the error value is minimized; and applying at least a part of the modified switching sequence to the electrical converter.
    Type: Application
    Filed: May 31, 2016
    Publication date: September 22, 2016
    Inventors: Tobias Geyer, Nikolaos Oikonomou, Georgios Papafotiou
  • Publication number: 20160226368
    Abstract: An electrical converter is interconnected via a filter with an electrical load or an electrical power source.
    Type: Application
    Filed: April 12, 2016
    Publication date: August 4, 2016
    Inventors: Peter Al-Hokayem, Tobias Geyer, Nikolaos Oikonomou
  • Patent number: 8766570
    Abstract: Exemplary embodiments are directed to a converter for an electrical system that is controlled in such that switching sequences for the converter, determined with respect to an optimization goal are modified such that by correcting a flux error resulting from assumptions on which the first optimization of the switching sequence is based.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: July 1, 2014
    Assignee: ABB Research Ltd
    Inventors: Tobias Geyer, Frederick Kieferndorf, Georgios Papafotiou, Nikolaos Oikonomou
  • Patent number: 8737103
    Abstract: A method is provided for predicting pulse width modulated switching sequences for a multi-phase multi-level converter. With a first predicted switching sequence, due to multi-phase redundancies, equivalent switching sequences are determined. From the equivalent switching sequences, one switching sequence optimal with respect to a predefined optimization goal is selected. The selected switching sequence is used to switch the converter.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: May 27, 2014
    Assignee: ABB Research Ltd
    Inventors: Frederick Kieferndorf, Georgios Papafotiou, Nikolaos Oikonomou, Tobias Geyer
  • Publication number: 20130016549
    Abstract: A method is provided for predicting pulse width modulated switching sequences for a multi-phase multi-level converter. With a first predicted switching sequence, due to multi-phase redundancies, equivalent switching sequences are determined. From the equivalent switching sequences, one switching sequence optimal with respect to a predefined optimization goal is selected. The selected switching sequence is used to switch the converter.
    Type: Application
    Filed: July 25, 2012
    Publication date: January 17, 2013
    Applicant: ABB RESEARCH LTD.
    Inventors: Frederick KIEFERNDORF, Georgios Papafotiou, Nikolaos Oikonomou, Tobias Geyer
  • Publication number: 20120161685
    Abstract: Exemplary embodiments are directed to a converter for an electrical system that is controlled in such that switching sequences for the converter, determined with respect to an optimization goal are modified such that by correcting a flux error resulting from assumptions on which the first optimization of the switching sequence is based.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Applicant: ABB RESEARCH LTD
    Inventors: Tobias GEYER, Frederick KIEFERNDORF, Georgios PAPAFOTIOU, Nikolaos OIKONOMOU