Patents by Inventor Ryangkyu KIM

Ryangkyu KIM 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).

  • Modular multilevel converter sub-module having DC fault current blocking function and method of controlling the same
    Patent number: 11139733
    Abstract: Disclosed is a modular multilevel converter sub-module, including: a normal circuit which includes a first switching element and a second switching element connected in series and a first diode and a second diode respectively connected to be parallel to the first switching element and the second switching element to offset a counter electromotive force generated in the first switching element and the second switching element, a fault DC current blocking circuit which includes a capacitor connected to the normal circuit in parallel and applies a capacitor voltage to a DC fault path as a reverse voltage with respect to a fault voltage, and a bypass circuit which includes a third switch element, is connected to the fault DC current blocking circuit in parallel, and determines an output voltage and a direction of an arm current to provide a DC fault current bypass path when a DC fault current occurs.
    Type: Grant
    Filed: April 9, 2020
    Date of Patent: October 5, 2021
    Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
    Inventors: Kyeon Hur, Heejin Kim, Sangmin Kim, Jongseo Na, Ryangkyu Kim
  • MODULAR MULTILEVEL CONVERTER SUB-MODULE HAVING DC FAULT CURRENT BLOCKING FUNCTION AND METHOD OF CONTROLLING THE SAME
    Publication number: 20200366186
    Abstract: Disclosed is a modular multilevel converter sub-module, including: a normal circuit which includes a first switching element and a second switching element connected in series and a first diode and a second diode respectively connected to be parallel to the first switching element and the second switching element to offset a counter electromotive force generated in the first switching element and the second switching element, a fault DC current blocking circuit which includes a capacitor connected to the normal circuit in parallel and applies a capacitor voltage to a DC fault path as a reverse voltage with respect to a fault voltage, and a bypass circuit which includes a third switch element, is connected to the fault DC current blocking circuit in parallel, and determines an output voltage and a direction of an arm current to provide a DC fault current bypass path when a DC fault current occurs.
    Type: Application
    Filed: April 9, 2020
    Publication date: November 19, 2020
    Applicant: Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Kyeon HUR, Heejin KIM, Sangmin KIM, Jongseo NA, Ryangkyu KIM