METHOD FOR ON-LINE DYNAMIC CONTINGENCY SCREENING OF ELECTRIC POWER SYSTEMS

A method for on-line dynamic contingency screening of electric power systems employs a sequence of contingency classifiers which are based on a method for finding the controlling unstable equilibrium point of the power system known as the boundary of stability region based controlling unstable equilibrium point method (BCU method). Dynamic security assessment of the power system is accomplished by evaluating the power system's response to a plurality of postulated disturbances known as contingencies. The BCU classifiers determine which of these contingencies are definitely stable, and require no further analysis. Other contingencies which are either classified as being unstable or undecided are then applied to a time-domain simulation program to determine if they are in fact unstable, and therefor warrant further action. Since the majority of the contingencies are determined by the BCU classifiers to be stable and need not be subjected to for the analysis, the computational speed of the dynamic security assessment process is greatly increased. Further, since the BCU classifiers are very accurate and never misclassify an unstable contingency as being stable, the accuracy of the dynamic security assessment is not compromised by the contingency screening process.