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eess.SY2026
Relative-Degree Wall Restricts Passivity-Based Stability Analysis in Inverter-Dominant Grids
Xiaoyu Peng, Zhongze Li, Xi Ru +2
This letter reveals a fundamental limitation of passivity-based distributed stability analysis in power systems. Under the standard formulation, passivity certification inherently…
eess.SY2026
Matrix-Valued Passivity Indices: Foundations, Properties, and Stability Implications
Xi Ru, Xiaoyu Peng, Xinghua Chen +3
The passivity index, a quantitative measure of a system's passivity deficiency or excess, has been widely used in stability analysis and control. Existing studies mostly rely on sc…