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Abstract
In this paper, an overview is provided of a new
method that in realtime provides an early warning for an
emerging blackout that are characterized by a slowly increasing
angular separation between subgroups of system generators.
Such angular separation between subgroups of generators can
eventually cause in very sharp decline in system voltages at
intermediate locations between the two groups as the angular
separation approaches 180◦. In order to receive an early warning
for the occurrence of such type of blackouts, the boundaries of the
system generators aperiodic smallsignal stability are suggested to
be monitored. For that purpose, method for realtime assessment
of aperiodic smallsignal rotor angle stability is presented. The
approach is based on an elementwise assessment of individual
synchronous machines where the aim is to determine the maximum
steady state power that each synchronous generator can
inject into the system. The limits for maximum injectable power
represent the boundary for aperiodic small signal stability.
The concept of the proposed method is tested on two different
systems. The results show that the method is capable of accurately
detecting when a given machine crosses the stability boundary.
The method can as well provide in realtime a margin to the
machines stability boundary, which can be used as an early
warning for an impending system stability problem.
Original language  English 

Title of host publication  IEEE PES Trondheim PowerTech 
Publisher  IEEE 
Publication date  2011 
Publication status  Published  2011 
Event  IEEE PES Trondheim PowerTech 2011  Trondheim, Norway Duration: 19 Jun 2011 → 23 Jun 2011 
Conference
Conference  IEEE PES Trondheim PowerTech 2011 

Country  Norway 
City  Trondheim 
Period  19/06/2011 → 23/06/2011 
Fingerprint
Dive into the research topics of 'RealTime Stability Assessment based on Synchrophasors'. Together they form a unique fingerprint.Projects
 1 Finished

SOSPO: Secure Operation of Sustainable Power Systems
Østergaard, J., Jóhannsson, H., Nielsen, A. H., GarciaValle, R., Yang, G., Lind, M., Blanke, M., Weckesser, J. T. G., Wittrock, M. L., Møller, J. G., Perez, A., Pedersen, A. S. & Zhang, X.
01/01/2012 → 31/03/2016
Project: Research
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