Patents by Inventor Toshihiko Harashima

Toshihiko Harashima 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 of controlling load on power plant and load control system for carrying out the same
    Patent number: 6230479
    Abstract: The invention suppresses the production of thermal stress in power generating equipment and the unstable behavior of the power generating equipment due to the variation of system frequency and stabilizes the system frequency. A power plant load control system controls the operation of a power plant equipped with a gas turbine comprising a combustor (1) and a turbine (3), and a power generator (5) disposed coaxially with the turbine. The power plant load control system comprises a governor load control unit (100) for determining a governor instruction (103d) on the basis of the deviation of generated power (102d) from a power generation instruction (101d) given thereto by a central load dispatching station according to the variation of system frequency, and for determining a fuel supply rate instruction (107d) corresponding to a speed droop ratio (R) according to the deviation of shaft speed (104d) from a governor instruction (103d).
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: May 15, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Hideyuki Kawamura, Toshihiko Harashima, Shoei Takahashi, Takeshi Ishida