A COMPREHENSIVE ANALYSIS OF MIDTERM VOLTAGE STABILITY

This paper proposes a comprehensive approach to mid-term voltage stabi lity, combining fast simulation, instability diagnosis and corrective control determination. The fast simulation approximates the mid-term e volution by a succession of equilibrium points, thereby offering a goo d compromise between efficiency and accuracy. The instability diagnosi s and corrective control determination consist of fast Sensitivity ana lyses at some points of the simulated system trajectory, in order to i dentify critical points and determine the smallest changes in power in jections required to recover stability. The method is illustrated on a real-life 1200-bus modelling of the French Western system.