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The quasi steady-state (QSS) model tries to reach a good compromise betweenaccuracy and efficiency in long-term stability analysis. However, the QSS modelis unable to provide correct approximations and stability assessment for thelong-term stability model consistently. In this paper, some numerical examplesin which the QSS model was stable while the long-term stability model underwentinstabilities are presented with analysis in nonlinear system framework. At thesame time, a hybrid model which serves as a remedy to the QSS model is proposedaccording to causes for failure of the QSS model and dynamic mechanisms oflong-term instabilities. Numerical examples are given to show that thedeveloped hybrid model can successfully capture unstable behaviors of thelong-term stability model while the QSS model fails.

Quasi Steady-State Model for Power System Stability: Limitations, Analysis and a Remedy