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HELMpy is an open source package of power flow solvers, including the Holomorphic Embedding Load Flow Method (HELM).

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HELMpy is an open source package of power flow solvers.

This package contains the Holomorphic Embedding Load flow Method (HELM) and the Newton-Raphson (NR) algorithm. The intention of HELMpy is to support research, especially on the HELM, and to contribute with the development of open source code related to this subject. The developed code is properly commented and organized so it would be easy to understand and modify.


This package is compatible with Python 3.6 and 3.7.


This package was developed by Tulio Molina and Juan José Ortega as a part of their thesis research to obtain the degree of Electrical Engineer at Universidad de los Andes (ULA) in Mérida, Venezuela.

HELMpy Guide

Please refer to HELMpy user's guide.pdf.

Setting up a virtual environment

Under Linux:

python3.7 -m venv venv

Activating the virtual environment

Under BASH:

source venv/bin/activate

Installing requirements


python -m pip install -r requirements.txt

Running tests

pytest test

Freezing the requirements

python -m pip freeze --all --exclude-editable > requirements.txt

Commit all upgrades

git commit requirements.txt
git push origin master

License - AGPLv3

HELMpy, open source package of power flow solvers developed on Python 3
Copyright (C) 2019 Tulio Molina and Juan José Ortega

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see <>.

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