Patents by Inventor Chur-Hee Lee

Chur-Hee Lee 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).

  • Device and method for extinction angle control of HVDC system
    Patent number: 10498142
    Abstract: A device for extinction angle control of a high voltage direct current (HVDC) system, includes: a converter reactive power calculator calculating a reactive power variation amount of a converter included in the HVDC system, depending on firing angle control of the converter; an alternating current (AC) system short circuit level calculator calculating a short circuit level of an AC system by applying the reactive power variation amount to a short circuit level formula of the AC system connected to the HVDC system; an extinction angle variation value calculator calculating an extinction angle variation value of the converter, corresponding to the short circuit level; and an extinction angle controller controlling an extinction angle of the converter, depending on an extinction angle control value reflecting the extinction angle variation value.
    Type: Grant
    Filed: November 24, 2016
    Date of Patent: December 3, 2019
    Assignee: KOREA ELECTRIC POWER CORPORATION
    Inventors: Seong-Doo Lee, Soon-Ho Choi, Chur-Hee Lee
  • DEVICE AND METHOD FOR EXTINCTION ANGLE CONTROL OF HVDC SYSTEM
    Publication number: 20190245351
    Abstract: A device for extinction angle control of a high voltage direct current (HVDC) system, includes: a converter reactive power calculator calculating a reactive power variation amount of a converter included in the HVDC system, depending on firing angle control of the converter; an alternating current (AC) system short circuit level calculator calculating a short circuit level of an AC system by applying the reactive power variation amount to a short circuit level formula of the AC system connected to the HVDC system; an extinction angle variation value calculator calculating an extinction angle variation value of the converter, corresponding to the short circuit level; and an extinction angle controller controlling an extinction angle of the converter, depending on an extinction angle control value reflecting the extinction angle variation value.
    Type: Application
    Filed: November 24, 2016
    Publication date: August 8, 2019
    Inventors: Seong-Doo LEE, Soon-Ho CHOI, Chur-Hee LEE