Patents by Inventor Jan Ove Gjerde

Jan Ove Gjerde 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).

  • Applications and methods for voltage instability predictor (VIP)
    Patent number: 6249719
    Abstract: A Voltage Instability Predictor (VIP) estimates the proximity of a power system to voltage collapse in real time. The VIP can be implemented in a microprocessor-based relay whose settings are changed adaptively to reflect system changes. Only local measurements (voltage and current) at the bus terminal are required. The VIP detects the proximity to collapse by monitoring the relationship between the apparent impedance {overscore (Z)}app and the Thévenin-impedance. In addition, we disclose: (1) that the VIP may be used in connection with non-radial topologies; (2) a new, more robust method to track voltage collapse in terms of impedance using rolling sums; and (3) a new method for representing distance to voltage collapse in terms of power margins.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: June 19, 2001
    Assignee: ABB Power T&D Company, Inc.
    Inventors: Khoi Tien Vu, Danny E. Julian, Jan Ove Gjerde, Murari M. Saha