pecblocks: Generalized block diagram modeling of power electronic converters for grid solar and storage applications.
Project description
pecblocks
Power Electronic Converter Blocks (pecblocks) use the output of detailed electromagnetic transient (EMT) simulations to produce generalized block diagram models of power electronic systems. The process uses deep learning with customized block architectures. The outputs are reduced-order models that meet specified accuracy requirements, while providing important advantages over the original EMT models:
- Converter Block models have fewer nodes and can take longer time steps, resulting in shorter simulation times
- Converter Block models are continuously differentiable, making them compatible with control design methods
Models will run in both time domain and frequency domain. The scope includes not only the power electronic converter, but also the photovoltaic (PV) array, maximum power point tracking (MPPT), phase-lock loop (PLL) control, output filter circuits, battery storage if present, etc. The applications include but may not be limited to solar power inverters, energy storage converters, motor drives, and other power electronics equipment.
User Instructions
Developer Instructions
Familiarity with Python, git
and sphinx
is expected. The developer may need credentials for this
project on GitHub, ReadTheDocs, and/or PyPi. The application program interface (API) and the schema
for JSON files are documented in the ReadTheDocs Manual.
Python 3.7.6 and later have been used for testing. From a command prompt in this directory, Install the necessary Python modules with:
git clone https://github.com/pnnl/pecblocks.git
cd pecblocks
pip install -r requirements.txt
pip install -e .
The project on ReadTheDocs will re-build automatically upon commits to the git repository. To build and run the documentation locally:
- Change to the
docs
subdirectory of your git clone - The first time only, invoke
pip install -r requirements.txt --upgrade-strategy only-if-needed
make html
- From a browser, open the file
docs\_build\html\index.html
from the directory of your git clone
To deploy the project on PyPi, staring in the directory of your git clone, where setup.py
is located:
- Make sure that the version number in
setup.cfg
andsrc\pecblocks\version.py
is new. - Invoke
build_package.bat
on Windows. This copies quick-start examples into the source tree, and does the following steps:- Invoke
rd /s /q dist
on Windows (would berm -rf dist
on Linux or Mac OS X) python -m build
twine check dist/*
should not show any errors
- Invoke
twine upload -r testpypi dist/*
requires project credentials for pecblocks on test.pypi.org (Note: this will reject if version already exists, also note that testpypi is a separate register to pypi)pip install -i https://test.pypi.org/simple/ pecblocks==0.0.3
for local testing of the deployable package, example version 0.0.3 (Note: consider doing this in a separate Python test environment)twine upload dist/*
for final deployment
If this doesn't work, some preparatory steps may be required:
- Invoke
pip install build
andpip install twine
if necessary - Project credentials are required for pecblocks on pypi.org. If 2-Factor-Authentication is enabled an API token needs to be used.
Directories
- data contains the training data used in project publications and examples
- docs contains the source files for user documentation
- examples contains the end-user scripts and configuration files to run various examples
- src contains the Python package code to be deployed on PyPi
In the examples subdirectory:
- data_prep processes ATP, lab, and newer Simscape outputs into a format form pecblocks
- dev contains archived examples, scripts, and models for developing the deployable package, and investigating Thevenin vs. Norton model sensitivity (no longer actively used)
- dll contains C/C++ and Python code for standalone evaluation of HWPV models in continuous time domain, using Backward Euler integration
- ex1 contains the first examples of inverter subsystem models (no longer actively used)
- helics contains a co-simulation example with Python federates
- hwpv contains the primary examples from project publications
- initialization was used to develop better initialization of the linear H1 block (no longer actively used).
- lcl uses phasor arithmetic to calculate voltages and currents at the inverter bridge terminals, from voltages and currents at the PCC. But this is an acausal operation, not good for control design. (no longer actively used)
- media contains graphics of training data sets and output comparisons.
- pv1 contains single-phase inverter modeling code, later incorporated into the generalized package for deployment (no longer actively used)
- sdomain contains a lightweight model evaluation test for Raspberry Pi, using numpy but not torch
- simscape processes MATLAB/Simscape outputs into a format for pecblocks (no longer actively used)
- training downloader and configuration for a quick-start example
License
See License
Notice
This material was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the United States Department of Energy, nor Battelle, nor any of their employees, nor any jurisdiction or organization that has cooperated in the development of these materials, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness or any information, apparatus, product, software, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or Battelle Memorial Institute. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
PACIFIC NORTHWEST NATIONAL LABORATORY
operated by
BATTELLE
for the
UNITED STATES DEPARTMENT OF ENERGY
under Contract DE-AC05-76RL01830
Copyright 2021-2024, Battelle Memorial Institute
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