Nonequilibrium Initialization: Seamless Connection Between Dynamic State Estimation and Dynamic Security Assessment

With the integration of renewable energy and demand response, the behavior of power systems has become more fluctuating than ever before. This challenges traditional dynamic security assessment based on the “steady-state” assumption of current operating points. To address these challenges, we formulate here a dynamic state estimation (DSE)-based dynamic security assessment (DSA
¹
) framework. In the new framework, we propose to use nonequilibrium initialization techniques to bridge DSE and DSA. Case studies demonstrate how the proposed nonequilibrium initialization can capture the dynamic that cannot be reflected in traditional static state-estimation–based security assessment.