Patents by Inventor Wangdan NI

Wangdan NI 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).

  • Tertiary frequency modulation method for power system
    Patent number: 12731991
    Abstract: A tertiary frequency modulation method for a power system, AGC based on power plant input performs active power regulation for tertiary frequency modulation in different modes in power plants in case of secondary frequency modulation failure of the power system and unidirectional deviation of grid frequency from rated frequency for a period: perform tertiary frequency modulation based on the reserved capacity of the secondary frequency modulation or the regulation amount of primary frequency modulation or random parameters. The invention relates to tertiary frequency modulation whose action sequence is later than that of the primary frequency modulation and the secondary frequency modulation to realize astatic frequency regulation.
    Type: Grant
    Filed: November 22, 2023
    Date of Patent: September 8, 2026
    Assignee: HUANENG LANCANG RIVER HYDROPOWER INC.
    Inventors: Lin Hu, Shuhong Yin, Yongjun Liu, Wangdan Ni, Dongming Zhong, Yangyicheng Li, Qing Yang, Sen Li
  • Secondary frequency modulation method for hydropower plant which satisfies positive correlation between regulation rate and rated capacity of hydropower plant
    Publication number: 20240339842
    Abstract: A secondary frequency modulation method for a hydropower plant which satisfies positive correlation between a regulation rate and a rated capacity of the hydropower plant, three secondary frequency modulation gain methods are provided, in which feedforward gain regulation and amplification gain regulation call as many hydropower generating units as possible to participate in secondary frequency modulation, and avoid or restrain the problem that the power regulation sensitivity of an active power regulation dead zone of a single hydropower generating unit is weakened; transfer gain regulation transfers the regulation margin of the hydropower generating unit not participating in the secondary frequency modulation to the hydropower generating unit participating in the secondary frequency modulation within the limit of the active power regulation dead zone of a single hydropower generating unit, so that the latter can obtain a larger active power regulation range.
    Type: Application
    Filed: January 23, 2024
    Publication date: October 10, 2024
    Inventors: Ziwei WANG, Shuhong YIN, Lin HU, Wei CHEN, Wangdan NI, Wei HE, Feng HU, Chuan CHEN
  • Tertiary frequency modulation method for power system
    Publication number: 20240313539
    Abstract: A tertiary frequency modulation method for a power system, AGC based on power plant input performs active power regulation for tertiary frequency modulation in different modes in power plants in case of secondary frequency modulation failure of the power system and unidirectional deviation of grid frequency from rated frequency for a period: perform tertiary frequency modulation based on the reserved capacity of the secondary frequency modulation or the regulation amount of primary frequency modulation or random parameters. The invention relates to tertiary frequency modulation whose action sequence is later than that of the primary frequency modulation and the secondary frequency modulation to realize astatic frequency regulation.
    Type: Application
    Filed: November 22, 2023
    Publication date: September 19, 2024
    Inventors: Lin HU, Shuhong YIN, Yongjun LIU, Wangdan NI, Dongming ZHONG, Yangyicheng LI, Qing YANG, Sen LI