Journal of Xi'an Jiaotong University

Reliability of Concave or Convex Characteristic Trajectory Criterion Using Partial Wideª²Area Measurement Information
Xie Huan¹,Zhang Baohui¹,Yu Guangliang¹,Zou Benguo²,Zhao Yishu²,Li Peng¹
£¨1.School of Electrical Engineering£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an 710049£¬China; 2.Electrical Institute, Shandong Electric Power Research Institute, Ji'nan 250001, China£©

Abstract£ºA new detection scheme for transient power systems instability with geometrical characteristics of trajectory in partial angle center is presented, and the generalized energy function is chosen to verify the validity. Avoiding seeking the center of whole system angle, this scheme gets rid of the limitation in the practical application. The simulation results on IEEE_145 bus system demonstrate that when the outª²step generator possesses observation condition, system instability is still able to be detected via the proposed criterion, and the extent of absence of the whole system trajectory information only leads to the difference of the transient instability detection time. The proposed scheme enables to detect system instability ahead of the traditional time domain simulation methods as 0.3-1 s.
Keywords£ºpartial wideª²area information; transient instability detection; generalized energy funcª²tion; geometrical characteristic of trajectory