Repositories

All STEPSS repositories are hosted under the SPS-L GitHub organization.

Repository Index

Repository	Role	Language	Visibility
stepss-java-ui	Java-based GUI front-end (v3.40)	Java	Public
stepss-pyramses	Python API/wrapper for RAMSES and the Helios power-flow engine	Python	Public
stepss-userguide	LaTeX user documentation and models reference	LaTeX	Public
stepss-uramses	User-defined device models framework	Fortran	Public
stepss-eigenanalysis	Small-signal / eigenvalue analysis tools	MATLAB	Public
stepss-cg-studio	Visual block diagram editor for CODEGEN models	Python/JS	Public
stepss-ramses	Core RAMSES simulation engine	Fortran	Private
stepss-PFC	Power-flow calculator (Newton-Raphson)	Fortran	Private
stepss-helios	Modern C++ reimplementation of the PFC power-flow calculator, with a C API shared library wrapped by PyRAMSES (pyramses.helios); releases ship CLI and C API binaries for Linux/macOS/Windows	C++	Private
stepss-dyngraph	Dynamic graph / topology module	Fortran	Private
stepss-Codegen	DSL-to-Fortran model code generator	Fortran	Private
stepss-docs	This documentation website	Astro/Starlight	Public

Public Repositories

STEPSS (GUI)

The main graphical user interface for STEPSS, built with Java (Swing/AWT) and the Ant build system.

• Repository: github.com/SPS-L/stepss-java-ui
• License: Apache License 2.0
• Requirements: Java 20 (64-bit)
• Build: ant build
• Run: java -jar dist/stepss.jar

stepss-pyramses

Python interface to the RAMSES simulator providing scripting access to simulations, plus the pyramses.helios module for AC power flows with the bundled Helios engine (Windows, Linux, and macOS).

• Repository: github.com/SPS-L/stepss-pyramses
• Install: pip install pyramses
• Documentation: PyRAMSES section on this site
• Includes: Nordic test system example; runnable power-flow examples under examples/helios/

stepss-userguide

The original LaTeX source for the STEPSS documentation (models reference and user guide).

• Repository: github.com/SPS-L/stepss-userguide
• Build: pdflatex stepss_doc.tex (run twice)
• Main file: stepss_doc.tex

stepss-uramses

Framework for compiling and linking custom Fortran models with RAMSES.

• Repository: github.com/SPS-L/stepss-uramses
• Platforms: Windows (Intel Fortran) and Linux (gfortran)
• Build (Linux): make -f Makefile.gfortran all

stepss-eigenanalysis

MATLAB-based tool for small-signal stability analysis using eigenvalues extracted from RAMSES.

• Repository: github.com/SPS-L/stepss-eigenanalysis
• Requirements: MATLAB R2016a+, PyRAMSES
• Methods: QZ, ARPACK, JDQR

stepss-cg-studio (CODEGEN Studio)

Browser-based visual editor for building CODEGEN user-defined models with drag-and-drop blocks.

• Repository: github.com/SPS-L/stepss-cg-studio
• Requirements: Python 3.10 or later
• Install: pip install stepss-cg-studio
• Run: cg-studio → open http://localhost:8765
• Documentation: CODEGEN Studio guide on this site

Contributing

Contributions to public repositories are welcome. For each repository:

1. Fork the repository
2. Create a feature branch
3. Submit a pull request

For issues or feature requests, use the GitHub Issues tab on the relevant repository.