An on-line transient stability emergency control approach is proposed, which couples an open-loop and a closed-loop emergency control technique. The open-loop technique uses on-line transient stability assessment in order to adapt the settings of automatic system protection schemes to the current operating conditions. On the other hand, the closed-loop technique uses measurements in order to design and trigger countermeasures, after the contingency has actually happened, then to continue

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... ing in a closedloop fashion. The approach aims at combining advantages of event-based and measurement-based system protection schemes, namely, speed of action and robustness with respect to uncertainties in system modeling. It can also comply with economic criteria. Index Terms− Transient stability, SIME method, Transient stability control, Emergency Control, Closed-loop Emergency Control, Open Loop Emergency Control. 10 BIOGRAPHIES Daniel Ruiz-Vega received the Electrical engineering degree from the Universidad Autónoma Metropolitana (Mexico) in 1991, the MSc. degree from the Instituto Politécnico Nacional (Mexico) in 1996 and the PhD degree from the University of Liège (Belgium) in 2002. His research concerns power system dynamic security assessment and control. He is an IEEE Associate member. Mevludin Glavic received M.Sc. and Ph.D. degrees from the University of Belgrade, Yugoslavia, and the University of Tuzla, Bosnia. As a postdoctoral researcher, within the Fulbright Program, he spent the academic year 1999/2000 with the University of Wisconsin-Madison. Presently, he is Research Fellow at the University of Liège, Department of Electrical Engineering and Computer Science. His fields of interest include power system control and optimization. Damien Ernst graduated as an Electrical Engineer from the University of Liège, in 1998. He is currently PhD student at the University of Liège and a FNRS Research Fellow. His research interests lie in the field of optimal control, reinforcement learning and power systems control.