Patents by Inventor Haixu Shi

Haixu Shi 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).

  • Control system and method for medium-voltage photovoltaic distribution system
    Patent number: 11770008
    Abstract: The embodiments of the present invention provide a control system and method for a medium-voltage photovoltaic distribution system. The medium-voltage photovoltaic distribution system includes N photovoltaic modules, N DC-DC converters, a DC-AC converter and a line-frequency transformer. Outputs of the N DC-DC converters are connected in parallel to a DC bus. The DC bus is connected to the DC-AC converter. The line-frequency transformer is configured to connect to a medium-voltage AC grid. The control system includes a bus voltage sampling circuit and N DC-DC converter control circuits corresponding to the N DC-DC converters respectively. Each DC-DC converter control circuit includes a bus voltage sampling circuit, a photovoltaic sampling circuit, a droop controller, a maximum power point tracking controller, an input voltage loop regulator and a pulse width modulation wave generating circuit.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: September 26, 2023
    Assignee: Tsinghua University
    Inventors: Jiangfeng Wang, Kai Sun, Haixu Shi
  • CONTROL SYSTEM AND METHOD FOR MEDIUM-VOLTAGE PHOTOVOLTAIC DISTRIBUTION SYSTEM
    Publication number: 20220302713
    Abstract: The embodiments of the present invention provide a control system and method for a medium-voltage photovoltaic distribution system. The medium-voltage photovoltaic distribution system includes N photovoltaic modules, N DC-DC converters, a DC-AC converter and a line-frequency transformer. Outputs of the N DC-DC converters are connected in parallel to a DC bus. The DC bus is connected to the DC-AC converter. The line-frequency transformer is configured to connect to a medium-voltage AC grid. The control system includes a bus voltage sampling circuit and N DC-DC converter control circuits corresponding to the N DC-DC converters respectively. Each DC-DC converter control circuit includes a bus voltage sampling circuit, a photovoltaic sampling circuit, a droop controller, a maximum power point tracking controller, an input voltage loop regulator and a pulse width modulation wave generating circuit.
    Type: Application
    Filed: July 31, 2020
    Publication date: September 22, 2022
    Applicant: Tsinghua University
    Inventors: Jiangfeng Wang, Kai Sun, Haixu Shi