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arXiv · 2610.32095

Model-Free Output-Admittance Reshaping for Stability Enhancement of Grid-Connected Inverters

Runnan Wang·Wanrong Li·Huawei Yuan·Sinan Li
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Abstract

Grid-connected inverters can be unstable when their current-control loops interact with an uncertain external network. Returning the existing controller to improve damping also alters current tracking because tracking dynamics and output admittance are coupled. This paper adds a local model-free control (MFC) loop around the existing current controller to reduce output admittance while closely preserving nominal current-tracking dynamics. The added loop uses local inverter parameters without an external grid or neighbouring converter model. A Norton formulation separates reference tracking from the current response to terminal-voltage disturbances and establishes a tracking-preservation condition for admittance reshaping. Reducing the disturbance response makes the inverter behave more like an ideal controlled current source. Averaged-model simulations show reductions exceeding 65% in the magnitudes of all four dq output-admittance elements over 10-200 Hz, with closely preserved current-tracking dynamics. Generalised Nyquist analysis predicts small-signal stability for all sampled grid-impedance cases with MFC, compared with 90.0% without MFC.

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Runnan Wang, Wanrong Li, Huawei Yuan, Sinan Li. 2026-10-23. Model-Free Output-Admittance Reshaping for Stability Enhancement of Grid-Connected Inverters. https://arxiv.org/abs/2610.32095

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