Van Cutsem, Thierry[Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation >]
Proceedings of the Power Plant and Power System Control Conference (PPPSC 2012)
Power Plant and Power System Control Conference (PPPSC 2012)
du 2 au 5 septembre 2012
[en] Voltage instability ; corrective control ; system integrity protection scheme ; load shedding ; distributed control ; wide-area monitoring ; wide-area protection ; adaptive systems
[en] A two-level adaptive load shedding scheme against voltage instability is proposed, adjusting its actions to the severity of the situation. The lower level includes a set of distributed controllers which curtail loads once the voltages at monitored transmission buses fall and stay for some time below threshold values. The adaptive nature of the proposed scheme comes from the upper level adjusting those thresholds in real-time. At the time instant the upper level detects that the system enters an emergency condition, it sends a signal to the lower-level controllers requesting them to take their currently measured voltages as threshold values. The upper-level emergency detection can be based on various criteria, the key-point being that it takes advantage of a wide-area monitoring of the system. In particular, the paper illustrates the use of a voltage instability detection scheme based on sensitivity computation. In case the upper level fails sending its signal, the lower-level controllers act in purely distributed mode, each using its preset threshold voltage. The capabilities of the proposed scheme are illustrated on a small but realistic test system.
Romanian Ministry of Labor, Family and Social Protection ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS