Decision trees applied to on-line transient stability assessment of power systems

Decision rules provided by an inductive inference method are examined for online use in transient stability analysis and preventive control. Consideration is given first to the stability region, expressed in terms of the relevant static, prefault parameters of the system, automatically identified by the decision rules. Stability margins are then proposed, measuring the distance to instability, i.e. the degree of the system robustness in facing a major disturbance. Methods to act on these margins in order to reinforce stability, if necessary, are further suggested. The stability measures and their use are illustrated using simulation results obtained on the basis of a realistic example.<>