EPRI’s OpenDER model aims to accurately represent steady-state and dynamic behaviors of inverter-based distributed energy resources (DERs). The model follows interconnection standards or grid-codes and is informed by the observed behaviors of commercial products. Currently, model version 2.1 includes photovoltaic (PV) and battery energy storage system (BESS) DER behaviors according to the capabilities and functionalities required by the IEEE standard 1547-2018. This first-of-its-kind model can be used to run snapshot, Quasi-Static Time Series (QSTS), and a variety of dynamic analyses to study the impacts of DERs on distribution operations and planning.

This project is licensed under the terms of the BSD-3 clause license.

Resources

OpenDER is under active development. Use the following resources to get involved.

• EPRI OpenDER homepage (link)
• Model specification: IEEE 1547-2018 OpenDER Model: Version 2.1, EPRI, Palo Alto, CA: 2023. 3002026631 (link)
• OpenDER model interface to OpenDSS for circuit level analysis (link)

Development Objective

• Harmonize accurate interpretations of the IEEE Std 1547-2018 DER interconnection standard among all the stakeholders, including utilities, distribution analysis tool developers, and original equipment manufacturers (OEMs).
• Build consensus through an open-to-all DER Model User’s Group (DERMUG), which will utilize EPRI developed model specifications and codes and provide feedback for continuous improvement of the OpenDER model.
• Help the industry properly model the DERs that are (or to be) grid interconnected and evaluate the associated impacts on distribution circuits accurately.

Overall Block Diagram

Dependencies

Python >= 3.7

numpy

pandas

matplotlib

Dependencies of the package are auto-installed by pip command below.

Installation

pip install opender

Example of Using the DER Model

Example script: main.py

This example generate DER output power in a dynamic simulation to demonstrate DER trip and enter service behavior. The grid voltage is set to be alternating between 1 and 1.11 per unit every ~10 minutes. DER should be observed to enter service and trip periodically.

Other examples can be found in the Examples directory. Click the .ipynb files to see example scripts and execution results.

Unit tests

Dependency: pytest

Execution command: pytest path-to-package\tests