3 papers
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…
math.OC2026
Positive Damping Region: A Graphic Tool for Passivization Analysis with Passivity Index
Xiaoyu Peng, Xi Ru, Zhongze Li +3
This paper presents a geometric framework for analyzing output-feedback and input-feedforward passivization of linear time-invariant systems. We reveal that a system is passivizabl…