4 papers
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…
When Can Phasor-Domain Device Models Be Trusted for Electromechanical Stability Analysis of Grid-Forming Converter-Dominated Microgrids?
Zhongze Li, Xiaoyu Peng, Xi Ru +4
Grid-forming (GFM) converter-dominated microgrids are often analyzed using reduced-order phasor-domain electromechanical GFM models, but the validity of these models is often taken…
Toward less conservative distributed stability analysis of power systems via matrix-valued differential passivity indices
Xi Ru, Cong Fu, Zhongze Li +2
Passivity indices have been widely adopted to derive distributed stability certificates for power systems. Nevertheless, conventional passivity indices remain scalar-valued even fo…
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…