Patents by Inventor Patrick Thomas Lewis

Patrick Thomas Lewis 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).

  • Communication-less fault section identification for hybrid HVDC transmission systems
    Patent number: 10732214
    Abstract: Disclosed herein are methods, systems, and devices for identifying a location of a fault in a hybrid high voltage direct current (HVDC) transmission system having a ground or underground cable section and an overhead line section. Some methods comprise determining whether a characteristic voltage oscillation is present at a cable side terminal of the HVDC transmission system, and in response, determining that the fault is located in the overhead line section. Some methods comprise determining whether a characteristic current oscillation or a terminal current exceeding a peak current threshold is present at an overhead line side terminal, and in response, determining that the fault is located in the overhead line section. The methods can be communication-less, wherein the actions are based on local measurements and/or are performed locally to where the fault is located or detected.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: August 4, 2020
    Assignee: University of Pittsburgh—Of the Commonwealth System of Higher Education
    Inventors: Patrick Thomas Lewis, Brandon M. Grainger, Hashim Abbas Al Hassan, Gregory Francis Reed
  • COMMUNICATION-LESS FAULT SECTION IDENTIFICATION FOR HYBRID HVDC TRANSMISSION SYSTEMS
    Publication number: 20180120367
    Abstract: Disclosed herein are methods, systems, and devices for identifying a location of a fault in a hybrid high voltage direct current (HVDC) transmission system having a ground or underground cable section and an overhead line section. Some methods comprise determining whether a characteristic voltage oscillation is present at a cable side terminal of the HVDC transmission system, and in response, determining that the fault is located in the overhead line section. Some methods comprise determining whether a characteristic current oscillation or a terminal current exceeding a peak current threshold is present at an overhead line side terminal, and in response, determining that the fault is located in the overhead line section. The methods can be communication-less, wherein the actions are based on local measurements and/or are performed locally to where the fault is located or detected.
    Type: Application
    Filed: May 19, 2016
    Publication date: May 3, 2018
    Applicant: UNIVERSITY OF PITTSBURGH - OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION
    Inventors: Patrick Thomas Lewis, Brandon M. Grainger, Hashim Abbas Al Hassan, Gregory Francis Reed