الفهرس 
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Abstract
Active computer control. of the interconnected power systems during emergencies for blackout prevention is an almost virgin territory. Because of the large and comp¬lex nature of the interconnected power system which spans continents to day and because of the novelty of the con¬trol objective, it is necessary to analyze the problem and carefully formulate it in system theoretical and eng¬ineering terms.
In this work, emergencies are classified in five degrees each is defined precisely. Five consecutive regi¬mes are established from the actual course of events dur¬ing such emergencies. The first two of these regimes op¬erate under severe time constraints with no possibility for central control. Local. feedback control is proposed for these regimes which is nevertheless stabilizing over¬all for the power system ,
Devising such controls becomes feasible by the intr¬oduction.of a new state space, ” The local equilibrium state space” , which is equivalent to the conventional state space in its information content but differs in that its components can be determined by local on line estimation at the local station from local measurements.