A new method for the determhation of stable and unstable equlllbrlum pohts in the Transient Energy Function method of stability analysis Is presented. Computation of the Unstable Equllibdum Point Is one of the fundamental steps in determination of the energy margin. The bads of the new method Is Its formulation as a power flow problem and the use of well known power flow algorithms for Its solution. Sparse matrix methods are used to achieve tbe indicated speedup The new method has shown robust behavior in all systems tested and performance improvements over previous methods. Results using test systems of up to 161 generators, 901 buses, and 2OOO lhes are given.
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