Comparison of critical trajectory methods for direct CCT computation for transient stability

Ardyono Priyadi*, Naoto Yorino, Yutaka Sasaki, Masahide Tanaka, Takuma Fujiwara, Yoshifumi Zoka, Hironori Kakui, Mitsuhiro Takeshita

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


This paper studies new techniques for critical trajectory method, a recent new method proposed by the authors for obtaining critical clearing time (CCT) for transient stability analysis. A specific feature of the proposed method lies in its ability to provide exact CCT without approximations since no such methods have existed so far. The method is based on the computation of the critical trajectory, which is defined as the trajectory that starts from a point on a fault-on trajectory at CCT and reaches an end point. There are a few possible methods for the treatment of the end point conditions, computational performances of the methods are investigated in terms of accuracy of CCT and computational efficiency. It is shown that the proposed methods successfully provide the exact CCT that agrees with the conventional numerical simulation method.

Original languageEnglish
Pages (from-to)870-876
Number of pages7
JournalIEEJ Transactions on Power and Energy
Issue number10
Publication statusPublished - 2010
Externally publishedYes


  • Critical clearing time
  • Critical trajectory method
  • Transient stability analysis


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