Real Time Transient Instability Detection with Partial Wide-Area Measurement Information

A 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 method of instability detection using partial wide-area measurement information is discussed. The simulation results in IEEE_145 bus systems demonstrate that when the out-step generator possesses observation condition, system instability is still able to be detected via the proposed criterion, and the extent of the absence of the whole system trajectory information only leads to the difference of the instability detection time. The proposed scheme enables to detect system instability ahead of the traditional time domain simulation methods as 0.3-1s.