A fast transient stability screening and ranking tool

This paper introduces a fast transient stability screening tool to classify a designated set of contingencies into stable and unstable subsets using direct methods. The proposed method is based on the conservativeness of the Lyapunov function. The classification processes of the contingencies are performed along the solution trajectory towards the Controlling Unstable Equilibrium Point (controlling UEP). The proposed screening tool is intended to reliably capture the unstable contingencies and efficiently reduce the number of contingencies that need further analyses. If a numerical problem is encountered during the computation, the proposed scheme applies homotopy-based approaches to find the desired solution. If the numerical problem can not be solved using homotopy-based methods, the contingency is sent to a time-domain simulator for further analysis. The method was applied on the Western System Coordinating Council (WSCC) test system and results are presented.