Patents by Inventor Zhenxia Shao

Zhenxia Shao 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).

  • Tripolar VSC-HVDC transmission system and method
    Patent number: 9948104
    Abstract: A tripolar VSC-HVDC system and method include a rectifier and an inverter formed by a three-phase six-bridge arms modular multilevel converter (MMC) respectively, and two converter valves are arranged on the DC side of the rectifier and inverter respectively. The midpoint of upper and lower converter valves of the rectifier and inverter are connected with a pole 3 DC line by a smoothing reactor. Triggering of the upper and lower converter valves is controlled to change the DC voltage polarity of the pole 3 periodically, and tripolar DC transmission is realized by modulating current orders of the three poles.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: April 17, 2018
    Assignees: NR Electric Co., Ltd., NR Electric Engineering Co., Ltd.
    Inventors: Ming Hu, Zhenxia Shao, Xinyan Jiao, Jie Tian, Yu Lu, Gang Shen
  • DIRECT-CURRENT POWER TRANSMISSION PROTECTION DEVICE, CONVERTER AND PROTECTION METHOD
    Publication number: 20170047727
    Abstract: The present invention discloses a direct-current power transmission protection device, including a resistor unit and a bidirectional circulation current switch unit, and the resistor unit and the bidirectional circulation current switch unit being connected in parallel to form the protection device, where at least one resistor is cascaded to form the resistor unit, and at least one bidirectional circulation current switch is cascaded to form the bidirectional circulation current switch unit. In addition, the present invention also provides a converter including the protection device, and at least one protection device is connected in series in each phase unit.
    Type: Application
    Filed: May 4, 2014
    Publication date: February 16, 2017
    Inventors: Dongming Cao, Yeyuan Xie, Zhenxia Shao, Yu Lu, Min Li, Haibin Lu, Haiying Li
  • TRIPOLAR VSC-HVDC TRANSMISSION SYSTEM AND METHOD
    Publication number: 20160336751
    Abstract: A tripolar VSC-HVDC system and method, include a rectifier and an inverter formed by a three-phase six-bridge arms modular multilevel converter (MMC) respectively, and two converter valves are arranged on the DC side of the rectifier and inverter respectively. The midpoint of upper and lower converter valves of the rectifier and inverter are connected with a pole 3 DC line by a smoothing reactor. Triggering of the upper and lower converter valves is controlled to change the DC voltage polarity of the pole 3 periodically, and tripolar DC transmission is realized by modulating current orders of the three poles.
    Type: Application
    Filed: January 22, 2015
    Publication date: November 17, 2016
    Inventors: Ming Hu, Zhenxia Shao, Xinyan Jiao, Jie Tian, Yu Lu, Gang Shen