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arXiv · 2607.10653

Open-Source Python Tool for Grid Converter Output Admittance Identification

Juho Määttä·Jarno Kukkola·Janne Seppänen·Marko Hinkkanen
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Abstract

Frequency-domain analysis based on converter output admittance is a key tool for studying converter-driven stability in power grids. This paper presents a Python-based identification tool built on a completely open-source simulator, eliminating the need for commercial licenses such as MATLAB or PSCAD and improving configurability through an MIT-licensed stack. The identification method uses steady-state signal injection with a sinusoidal sweep, deriving frequency-domain admittance from time-domain simulations. Analytical output-admittance models are developed for both grid-forming (disturbance-observer-based) and grid-following (phase-locked-loop-based) control to verify the numerical results. The tool's results are compared against a commercial PSCAD-based alternative, demonstrating accurate admittance identification across control methods. Code and examples are available online to support reproducibility.

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Juho Määttä, Jarno Kukkola, Janne Seppänen, Marko Hinkkanen. 2026-07-12. Open-Source Python Tool for Grid Converter Output Admittance Identification. https://arxiv.org/abs/2607.10653

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