Padiyar, K.R.Sastry, H.S.Y.2020-03-312020-03-311986Electric Machines and Power Systems, 1986, Vol.11, 5, pp.421-441https://idr.nitk.ac.in/handle/123456789/11282In this paper, a fast method of evaluating the transient stability of power systems using a topological energy function is presented. This is applicable to the case when the load buses are uncoupled and for a class of nonlinear voltage dependent loads. A topological energy function (TEF), using centre of angle (COA) formulation, is used for computation of the stability region. A power Invariant transformation is presented which leads to the decoupling of load buses in a practical system with connected load buses. Although the load characteristics do not remain invariant under this transformation, approximations can be introduced to facilitate the analysis. A numerical example is precentod to illustrate the application of the method. 1986 by Hemisphere Publishing Corporation.Article