Abstract
This paper examines the load margins and bifurcation types of the power flow model and those of the quasi-steady state (QSS) model. Physical explanations are provided for the difference in load margins between the two models. This examination shows that load margins of the power flow model are always greater than those of the QSS model. On the other hand, both the power flow model and the QSS model encounter the same type of local bifurcations, which can be either the saddle-node bifurcation (SNB) or the structure-induced bifurcation (SIB). The numerical studies conducted in this paper confirm the above observation and raise the issue of accuracy in load margin calculation using the power flow model.
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