Patents by Inventor Congbo Wang

Congbo Wang 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).

  • Photovoltaic direct current distribution system having a fault detection and location-based active protection system
    Patent number: 10965123
    Abstract: A detection and location-based active protection method for flexible DC distribution systems with multi-terminal distributed photovoltaic sources is disclosed. The disclosed protection method actively utilizes the coordinated control between local protection and the converters in the DC distribution system. The converter can then be modified to become an injection source with characteristic signal, providing a known fault signal to build a clear protection boundary. The disclosed protection method can distinguish the correct faulted area by calculating the harmonic impedance of the characteristic signals. Compared with existing DC protection techniques, this disclosed method does not require additional injection equipment and modification of the DC distribution system configuration, nor does it need high data sampling frequency. The disclosed technique is also unaffected by measuring noise and cable-distributed capacitance.
    Type: Grant
    Filed: October 22, 2020
    Date of Patent: March 30, 2021
    Assignee: North China Electric Power University
    Inventors: Ke Jia, Tianshu Bi, Congbo Wang
  • Active protection system and method for photovoltaic direct current distribution system
    Patent number: 10868422
    Abstract: A detection and location-based active protection method for flexible DC distribution systems with multi-terminal distributed photovoltaic sources is disclosed. The disclosed protection method actively utilizes the coordinated control between local protection and the converters in the DC distribution system. The converter can then be modified to become an injection source with characteristic signal, providing a known fault signal to build a clear protection boundary. The disclosed protection method can distinguish the correct faulted area by calculating the harmonic impedance of the characteristic signals. Compared with existing DC protection techniques, this disclosed method does not require additional injection equipment and modification of the DC distribution system configuration, nor does it need high data sampling frequency. The disclosed technique is also unaffected by measuring noise and cable-distributed capacitance.
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: December 15, 2020
    Assignee: North China Electric Power University
    Inventors: Ke Jia, Tianshu Bi, Congbo Wang