Method and system for on-line dynamical screening of electric power system

A system for on-line dynamic screening of contingencies comprising postulated disturbances which an electric power system may experience, said system comprising:

• a) a dynamic contingency screening program for evaluating a plurality of contingencies with a plurality of contingency classifiers based on the method of finding the controlling unstable equilibrium point of said power system known as the boundary of stability region based controlling unstable equilibrium point method by sequentially applying said contingencies to a network islanding problem classifier, a S.E.P problem classifier, a large stability regions classifier, an exist point problem classifier, a ray adjustment problem classifier, an energy function problem classifier, a CUEP convergence problem classifier, and a controlling UEP (unstable equilibrium point) classifier to form a first group of stable contingencies and a second group of unstable or undecided contingencies;
• and
• b) a time-domain simulation program for determining which of said second group of contingencies are unstable.

A BCU guided time-domain method which inputs a power system with related data for dynamic security assessment and a contingency and outputs stability assessment and energy margin value for the contingency on the power system, comprising the steps of;

• applying a boundary of stability region based controlling unstable equilibrium point method to compute the exit point, and
• declaring to be highly stable and the energy margin by a post-fault system, when the exit point not be found with a certain period.