Sweep frequency response analysis, step excitation, and eigensystem realization give consistent dq admittance estimates for a simulated grid-forming inverter between 1 Hz and 100 Hz, with step-based methods being faster.
Impedance-based root-cause analysis: Comparative study of impedance models and calculation of eigenvalue sensitivity,
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Admittance Identification of Grid-Forming Inverters Using Time and Frequency-Domain Techniques
Sweep frequency response analysis, step excitation, and eigensystem realization give consistent dq admittance estimates for a simulated grid-forming inverter between 1 Hz and 100 Hz, with step-based methods being faster.