Parameterized small signal approach for identifying the admittance matrix of EVs for harmonic and supraharmonic propagation studies

• Derives Y FCM for EV chargers using switching-pattern information from detailed Simulink converter models. • Unified harmonic and supraharmonic framework (from100 Hz–10 kHz) enabling multi- frequency coupling assessment and propagation studies in LV networks. • Stochastic/Monte Carlo variability study with heterogeneous EV populations (2-level and 3-level Vienna) and randomized allocations across nodes and iterations. • Simulation-based validation under distorted (flat-topped) supply voltage using background harmonics up to the 10th order and comparison against time-domain switching results. • Demonstrates that on weak grids the voltage response is dominated by the injected frequency, with comparatively small sideband magnitudes. The growing penetration of power-electronic loads such as EVs in low-voltage networks motivates accurate models for harmonic and supraharmonic impact assessment. This paper proposes a parameterized framework for EV front-end converters in which a detailed Simulink switching model is used to identify the frequency coupling matrix (FCM) and the resulting frequency-dependent admittance. Based on a focused literature review, the FCM approach is adopted to capture cross-frequency, cross-sequence, and cross-phase interactions. The framework is applicable to both two-level VSC and three-level Vienna-type converters and their control strategies, enabling scalable frequency-domain propagation studies. A charging-hub case study demonstrates integration of the identified admittances into a network model, where disturbance propagation is quantified via controlled current injection and evaluation of the resulting nodal voltage spectra.