Measurement-based lyapunov modal analysis using prony analysis

Modern power grids are in need of advanced stability analysis tools due to their generation and consumption development trends. Lyapunov modal analysis combines two stability analysis approaches: modal analysis and Lyapunov functions spectral decomposition. Related currently available research requires a linear model of a studied system. Nevertheless, there is a significant interest in data-driven stability analysis methods based on measurements rather than pre-existing models. This motivates the presented study of measurement-based Lyapunov modal analysis feasibility. We derived new formulas for Lyapunov modal contributions calculation that based on data provided by Prony analysis of measurements captured in a nonlinear models or systems. We also conducted case studies using our software implementation of measurement-based Lyapunov modal analysis and node voltage transients measured in IEEE 68 power system model. The paper concludes with comparative analysis between measurement and model-based implementations.