In the emerging power systems dominated by inverter-based resources (IBR), wideband oscillations have become an increasingly critical issue. To analysis the dynamic oscillation phenomenon, this study proposes a novel dynamic model based on the Hamiltonian function, which decomposes the system's total energy into three physically interpretable components: stored energy, dissipated energy, and interactive energy. The simulation results demonstrate that the proposed energy model achieves high accuracy and effectiveness. Notably, within the dq coordinate system, the direct current (DC) component of oscillation stored energy exhibits a distinct downward trend, the modal energy storage has significantly increased. However, the underlying physical conversion mechanism remains to be fully elucidated.
Zhang et al. (Sun,) studied this question.