Z-tool: Open-Source Frequency-Domain Analysis Toolbox for EMT Models
A Python-based implementation for the stability analysis of converters
Etch - The Energy Transmission Competence Hub - have released an open-source Python-based implementation for the stability analysis of AC/DC power systems.
The PSCAD-based tool is available to download free here
The core functionalities are impedance/admittance characterization and small-signal stability assessment. The analysis relies on an existing system model in the EMT simulation software PSCAD.
The following features are currently implemented and validated:
- Voltage perturbation-based admittance scan at several nodes, including MMC-based systems and black-box components
- Stability assessment via Generalized Nyquist Criteria applicable to standalone-stable MIMO systems
- Oscillation mode identification via eigenvalue decomposition (EVD) and bus participation factors
- Passivity assessment and Singular Value Decomposition functions
The flowchart below summarizes a common usage of the tool for stability studies, including frequency-domain system identification (frequency_sweep) and several stability analysis functions (stability_analysis):
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