Patents by Inventor Changxin ZHANG

Changxin 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).

  • Off-grid energy storage system and control method for off-grid energy storage system
    Patent number: 10574064
    Abstract: An off-grid energy storage system includes n energy storage inverters identified by P1, P2, . . . , Pn sequentially, direct current sides of the inverters are connected to storage batteries, and alternate current sides of the inverters are connected in parallel. The storage battery connected to the direct current side of Pj is identified by Bj, where j=2, 3, . . . , n. A control system for an output waveform of P1 has a voltage-current double loop control structure, and a control system for an output waveform of Pj has a current loop control structure. A current loop given value of Pj is obtained by adding a current correction value of Pj to a current loop given value of P1. The current correction value of Pj is used for causing Bj to have the same operating parameter as B1.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: February 25, 2020
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Yang Liu, Changxin Zhang, Wei Cao, Yong Yu
  • OFF-GRID ENERGY STORAGE SYSTEM AND CONTROL METHOD FOR OFF-GRID ENERGY STORAGE SYSTEM
    Publication number: 20180262022
    Abstract: An off-grid energy storage system includes n energy storage inverters identified by P1, P2, . . . , Pn sequentially, direct current sides of the inverters are connected to storage batteries, and alternate current sides of the inverters are connected in parallel. The storage battery connected to the direct current side of Pj is identified by Bj, where j=2, 3, . . . , n. A control system for an output waveform of P1 has a voltage-current double loop control structure, and a control system for an output waveform of Pj has a current loop control structure. A current loop given value of Pj is obtained by adding a current correction value of Pj to a current loop given value of P1. The current correction value of Pj is used for causing Bj to have the same operating parameter as B1.
    Type: Application
    Filed: February 27, 2018
    Publication date: September 13, 2018
    Inventors: Yang LIU, Changxin ZHANG, Wei CAO, Yong YU