Patents by Inventor Wanning ZHENG

Wanning ZHENG 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).

  • Ride-through and recovery method for DC short circuit faults of hybrid MMC-based HVDC system
    Patent number: 9627956
    Abstract: A ride-through and recovery method for DC short circuit faults of a hybrid modular multilevel converter based high-voltage direct current transmission (MMC-HVDC) system, the hybrid MMC including multiple full-bridge sub-modules and half-bridge sub-modules, and the method including: 1) detecting whether a DC short circuit fault occurs, and proceeding to step (2) if yes and continuing detecting if no; 2) realizing ride-through of the DC short circuit fault; 3) detecting whether a DC residual voltage increases, and proceeding to step (4) if yes and continuing detecting if no; and 4) realizing DC short circuit fault recovery.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: April 18, 2017
    Assignee: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Jiabing Hu, Kecheng Xu, Maozeng Lu, Wanning Zheng
  • RIDE-THROUGH AND RECOVERY METHOD FOR DC SHORT CIRCUIT FAULTS OF HYBRID MMC-BASED HVDC SYSTEM
    Publication number: 20160094117
    Abstract: A ride-through and recovery method for DC short circuit faults of a hybrid modular multilevel converter based high-voltage direct current transmission (MMC-HVDC) system, the hybrid MMC including multiple full-bridge sub-modules and half-bridge sub-modules, and the method including: 1) detecting whether a DC short circuit fault occurs, and proceeding to step (2) if yes and continuing detecting if no; 2) realizing ride-through of the DC short circuit fault; 3) detecting whether a DC residual voltage increases, and proceeding to step (4) if yes and continuing detecting if no; and 4) realizing DC short circuit fault recovery.
    Type: Application
    Filed: February 12, 2015
    Publication date: March 31, 2016
    Inventors: Jiabing HU, Kecheng XU, Maozeng LU, Wanning ZHENG