Transient stability evaluation method based on kinetic energy of postfault trajectories

Takahiro Okuda*, Shinichi Nakagawa, Yuta Ohsaki, Shinichi Iwamoto

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    It is very important to maintain supply reliability in the deregulated environment. The transient stability problem is one of the major concerns in studies of planning and operation of power systems. Time domain simulation is currently the best available tool for allowing the use of detailed models and for providing reliable results. The main limitations of this approach involve long computation times. Therefore, this paper proposes a transient stability evaluation method using minimum transient kinetic energy of postfault trajectories. This method can estimate critical clearing times with only two points of the minimum transient kinetic energy, regardless of whether the trajectories after the clearing time are stable or unstable. The validity of the proposed method is shown by simulation studies with the IEEJ EAST 10-machine 47-bus system.

    Original languageEnglish
    Pages (from-to)18-24
    Number of pages7
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Issue number3
    Publication statusPublished - 2011 Feb


    • critical clearing time
    • kinetic energy
    • power system
    • transient energy function
    • transient stability

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology


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