State-space and Impedance Modeling Methods for Stability Analysis of Interconnected Power Electronic Systems

With the high penetration of renewable energy sources and the extensive use of power electronic devices, power electronic systems (PESs) may exhibit oscillations featuring a wide frequency range, multiple device interactions, and widespread propagation. These features pose challenges for traditional state-space model (SSM)- and impedance model (IM)-based analysis, resulting in a significant need for efficient small-signal stability analysis methods for large-scale PESs. This paper comprehensively reviews the state-of-the-art small-signal stability analysis methods of large-scale PESs, including the novel SSM-based analysis, single-bus IM-based analysis, and multi-bus IM-based analysis. The fundamental concepts, evaluations, and development trends of these methods are systematically reviewed. Moreover, the frequency-scanning-based and data-driven black-box models for grid-tied converters are discussed. Finally, a comparative analysis of different methods is presented.