Wide-Area Assessment of Aperiodic Small Signal Rotor Angle Stability in Real-Time

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    This paper presents the details of a new real-time stability assessment method. The method assesses a particular mechanism of stability: each generator's capability to generate sufficient steady state electromechanical torque. The lack of sufficient steady state torque causes aperiodic increase in rotor angle and a loss of synchronism, referred to as aperiodic small signal instability. The paper provides the theoretical background of the method and an analytical assessment criterion. Furthermore, a mathematical mapping of the generators' operating points that enables informative visualization of multiple operating points is derived in the paper. Finally, results from timedomain simulation of instability scenarios in the Nordic32 test system are presented and results used for testing
    the assessment method. The results illustrate the method's capability to efficiently identify the location of the emerging problem and to quantify margins to stability boundary.
    Original languageEnglish
    Title of host publicationProceedings of 2014 IEEE PES General Meeting, Conference & Exposition
    Number of pages1
    Publication date2014
    ISBN (Electronic)978-1-4799-6415-4
    Publication statusPublished - 2014
    Event2014 IEEE PES General Meeting - National Harbor, Washington, United States
    Duration: 27 Jul 201431 Jul 2014


    Conference2014 IEEE PES General Meeting
    LocationNational Harbor
    Country/TerritoryUnited States


    • Power system measurements
    • Power system monitoring
    • Power system stability
    • Generators
    • Impedance
    • Real-time systems
    • Rotors
    • Stability analysis
    • Steady-state


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