	US 12,105,134 B2
	Method and system for quickly determining transient stability of half-wavelength transmission system
Hao Tian, Shandong (CN); Dong Yang, Shandong (CN); Zhe Jiang, Shandong (CN); Kang Zhao, Shandong (CN); Huan Ma, Shandong (CN); Ning Zhou, Shandong (CN); Zhixuan Zhang, Shandong (CN); Dingyi Cheng, Shandong (CN); Shan Li, Shandong (CN); Wenxue Liu, Shandong (CN); Qiao Fang, Shandong (CN); Xudong Hao, Shandong (CN); and Facai Xing, Shandong (CN)
Assigned to State Grid Shandong Electric Power Research Institute, Jinan (CN)
Appl. No. 17/925,850
Filed by State Grid Shandong Electric Power Research Institute, Shandong (CN)
PCT Filed Aug. 4, 2022, PCT No. PCT/CN2022/110130 § 371(c)(1), (2) Date Nov. 17, 2022, PCT Pub. No. WO2023/077889, PCT Pub. Date May 11, 2023.
Claims priority of application No. 202111300840.6 (CN), filed on Nov. 4, 2021.
Prior Publication US 2024/0230743 A1, Jul. 11, 2024
Int. Cl. G01R 31/08 (2020.01); H02J 3/00 (2006.01)

CPC G01R 31/088 (2013.01) [G01R 31/085 (2013.01); H02J 3/00125 (2020.01)]

14 Claims

1. A method for quickly determining transient stability of a half-wavelength transmission system, comprising:

obtaining power and a power angle of a feeding-end generator of a half-wavelength transmission system; and

determining transient power angle stability and a power angle instability mode of the half-wavelength transmission system by using a constructed index system, wherein

two power angle instability modes, that is, an instability mode 1 and an instability mode 2, are specifically constructed for the half-wavelength transmission system based on an equal area method;

wherein in the instability mode 1, the generator continuously decelerates and loses stability; and in the instability mode 2, the generator decelerates first, and then continuously accelerates and loses the stability;

wherein the constructed index system comprises a phase plane curve between the power angle and an angular velocity of the generator, which takes the power angle of the generator as an abscissa and the angular velocity of the generator as an ordinate.