Determination of Accurate Critical Clearing Time for Transient Stability Assessment

Transient Stability Assessment (TSA) is essentially important since recent blackout in northern India turns most of the research people towards dynamic security. Transient stability is inherently a Differential-Algebraic equation which is needed to be tackled by an effective method. So, Time Domain Approach is implied in solving TSA.The main objective of this paper is to determine accurate Critical Clearing Time (CCT) for various line outages and to check whether system stability is preserved during contingency cases. The results are simulated for WSCC three generators, nine bus system through which the robustness and effectiveness of this approach has been proved. Index Terms – Transient Stability Assessment, Time Domain Approach,Center of Inertia, Critical Clearing Time,Critical Angle.