A time-scale decomposition-based simulation tool for voltage stability analysis

This paper proposes a time domain simulation tool combining full time scale (FTS) simulation in the short-term period following a contingency and quasi steady-state (QSS) approximation for the long-term phase. A criterion is devised to automatically switch from FTS to QSS simulation as soon as sufficient damping of short-term dynamics is reached. Various comparisons with FTS simulations have been performed on the Hydro-Quebec system. The proposed method is shown to combine accuracy of FTS with computational efficiency of QSS. Sensitivity of simulations to load model and the need for updating the whole model with frequency variations are also discussed.