On the Accuracy of the Online Static Security Assessment Under Different Models: Assessment and Basis

Static security assessment (SSA) has been regularly performed using the power flow (PF) model for decades. It plays an important role in ensuring power system security. This paper numerically shows that, as the loading condition of a power system increases, the differences between the PF solution and the steady state of the corresponding time-domain (TD) solution also increase. The striking differences raise serious concern regarding the accuracy of PF-based SSA under heavy loading conditions. Physical explanations for misclassifications by PF-based SSA are provided. We then evaluate the accuracy of performing SSA with the quasi steady state (QSS) model, especially during heavy loading conditions. By using the steady states of post-contingency TD trajectories as the benchmark, this paper presents analytical results verifying the accuracy of the QSS-based SSA. In this paper, numerical evaluations are presented on the IEEE 6-bus, 14-bus, 30-bus, and 145-bus systems.

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