Patents by Inventor Hanlu Zhang

Hanlu Zhang 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).

  • Method for modeling sequence impedance of modular multilevel converter under phase locked loop coupling
    Patent number: 11687699
    Abstract: The present invention discloses a method for modeling sequence impedance of a modular multilevel converter (MMC) under phase locked loop (PLL) coupling. The method includes the following steps: S1, establishing a circuit topology model; S2, establishing a PLL output characteristic model; S3, establishing a PI controller output control small signal model under a dq axis; S4, deducing a modulation small signal; and S5, calculating MMC port impedance. According to the method, a precise MMC port impedance model is established by analyzing a double mirror frequency coupling effect in the output of a modulation signal in a control link caused by a phase angle disturbance and comprehensively considering the combination of the multi-harmonic coupling effect of an MMC.
    Type: Grant
    Filed: December 11, 2021
    Date of Patent: June 27, 2023
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Fujin Deng, Yun Zhou, Hanlu Zhang, Chengkai Liu, Jianzhong Zhang
  • METHOD FOR MODELING SEQUENCE IMPEDANCE OF MODULAR MULTILEVEL CONVERTER UNDER PHASE LOCKED LOOP COUPLING
    Publication number: 20230118255
    Abstract: The present invention discloses a method for modeling sequence impedance of a modular multilevel converter (MMC) under phase locked loop (PLL) coupling. The method includes the following steps: S1, establishing a circuit topology model; S2, establishing a PLL output characteristic model; S3, establishing a PI controller output control small signal model under a dq axis; S4, deducing a modulation small signal; and S5, calculating MMC port impedance. According to the method, a precise MMC port impedance model is established by analyzing a double mirror frequency coupling effect in the output of a modulation signal in a control link caused by a phase angle disturbance and comprehensively considering the combination of the multi-harmonic coupling effect of an MMC.
    Type: Application
    Filed: December 11, 2021
    Publication date: April 20, 2023
    Inventors: Fujin DENG, Yun ZHOU, Hanlu ZHANG, Chengkai LIU, Jianzhong ZHANG
  • Process and Apparatus for Coupling Separation and Purification of Ethyl Tert-Butyl Ether
    Publication number: 20120289750
    Abstract: A process and device of coupling separation and purification to produce ethyl tert-butyl ether (ETBE) is provided, wherein ethanol containing 1 wt % to 15 wt % of water, and a mixture containing ETBE and ethanol are fed into the distillation-extraction coupling zone for separation and purification. Said distillation-extraction coupling zone is composed of a distillation column and an extraction column. Said process and device can achieve the cogeneration of ETBE and ethanol, and possesses high commercial values.
    Type: Application
    Filed: November 29, 2010
    Publication date: November 15, 2012
    Applicant: EAST CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Wuping Zhang, Shanhua Zhou, Wenli Zhang, Hengshui Tian, Hanlu Zhang, Fugeng Zhu, Jingjun Gu