Patents by Inventor Heya YANG

Heya YANG 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 DC islanding detection based on positive feedback of bus voltage at specific frequency
    Patent number: 12013426
    Abstract: A method for a direct current (DC) islanding detection based on positive feedback of a bus voltage at a specific frequency, essentially including three steps: extraction of a specific frequency component of the bus voltage, injection of a disturbance component of the specific frequency, and determination of DC islanding. The extraction of the specific frequency component of the bus voltage and the injection of the disturbance component of the specific frequency constitute a positive feedback mechanism in a power management unit control loop. In a grid-connected mode of a DC grid, the positive feedback mechanism fails due to a control action of a voltage management unit on a bus, and the bus voltage remains stable. In an islanding mode of the DC grid, under an action of the positive feedback mechanism, the power management unit allows the bus voltage to generate a self-excited oscillation at the specific frequency.
    Type: Grant
    Filed: June 1, 2020
    Date of Patent: June 18, 2024
    Assignee: Zhejiang University
    Inventors: Wuhua Li, Qinghui Huang, Chushan Li, Heya Yang, Xiaowei Gu, Min Chen, Huan Yang, Xiangning He
  • METHOD FOR DC ISLANDING DETECTION BASED ON POSITIVE FEEDBACK OF BUS VOLTAGE AT SPECIFIC FREQUENCY
    Publication number: 20220011358
    Abstract: A method for a direct current (DC) islanding detection based on positive feedback of a bus voltage at a specific frequency, essentially including three steps: extraction of a specific frequency component of the bus voltage, injection of a disturbance component of the specific frequency, and determination of DC islanding. The extraction of the specific frequency component of the bus voltage and the injection of the disturbance component of the specific frequency constitute a positive feedback mechanism in a power management unit control loop. In a grid-connected mode of a DC grid, the positive feedback mechanism fails due to a control action of a voltage management unit on a bus, and the bus voltage remains stable. In an islanding mode of the DC grid, under an action of the positive feedback mechanism, the power management unit allows the bus voltage to generate a self-excited oscillation at the specific frequency.
    Type: Application
    Filed: June 1, 2020
    Publication date: January 13, 2022
    Applicant: Zhejiang University
    Inventors: Wuhua LI, Qinghui HUANG, Chushan LI, Heya YANG, Xiaowei GU, Min CHEN, Huan YANG, Xiangning HE