公开(公告)号：US20240339842A1

公开(公告)日：2024-10-10

申请号：US18419618

申请日：2024-01-23

Applicant: HUANENG LANCANG RIVER HYDROPOWER INC.

Inventor： Ziwei WANG ,  Shuhong YIN ,  Lin HU ,  Wei CHEN ,  Wangdan NI ,  Wei HE ,  Feng HU ,  Chuan CHEN

IPC: H02J3/46 ,  F03B13/00 ,  H02J3/00

CPC classification number: H02J3/46 ,  F03B13/00 ,  H02J3/0075 ,  F05B2220/706

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.

公开(公告)号：US20240313539A1

公开(公告)日：2024-09-19

申请号：US18518381

申请日：2023-11-22

Applicant: HUANENG LANCANG RIVER HYDROPOWER INC.

Inventor： Lin HU ,  Shuhong YIN ,  Yongjun LIU ,  Wangdan NI ,  Dongming ZHONG ,  Yangyicheng LI ,  Qing YANG ,  Sen LI

IPC: H02J3/24 ,  H02J3/28 ,  H02J3/38

CPC classification number: H02J3/241 ,  H02J3/28 ,  H02J3/381

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. Compared with the secondary frequency modulation function, the tertiary frequency modulation function completely gets rid of the dependence on a central node; compared with the primary frequency modulation function, the tertiary frequency modulation method undoubtedly has higher stability and sustainability in the regulation effect.