A robustness-based approach to determining preventive and emergency control zones

Structured singular value theory has been used in a number of applications to check the robust stability in power system models with real parametric uncertainty. In this paper, a general formulation for characterizing the effect of simultaneous variations of operating conditions on robust stability problems associated with real parameter variations is presented. Robustness evaluation techniques are then used to produce online preventive and emergency control actions. Such improvements are required for analysis of large-scale uncertain systems, which have large numbers of uncertain parameters.