OpenIBR

Power electronics-connected renewable generation, battery storage, and data centers dominate the interconnection queue and are displacing the synchronous machines that historically anchored voltage, frequency, and phase stability. To maintain a reliable power system through this evolution, these inverter-based resources (IBRs) must provide stabilizing dynamic behaviors and maintain compatibility with protection systems. Without a paradigm shift, grids with high renewables penetration risk widespread instability, as underscored by the Brazil blackout of August 2023 and the Iberian Peninsula blackout of April 2025.

OpenIBR facilitates better long-term grid planning and is based on three core principles: simplicity, so planning engineers can predict how a plant will behave; grid-forming controls, so that grid behavior mirrors the physics that the grid runs on; and transparency, so it can be verified, not taken on faith.

The library provides an open-source grid-forming controller that emulates a simplified synchronous machine in software. Instead of tracking an external reference, the inverter establishes its own voltage, frequency, and phase, behaving like a well-damped, voltage-forming source. Its tuning parameters are native power-system quantities, so engineers can screen for stability and protection with the analytical tools they already use.

By providing a transparent, validated, and interoperable foundation for inverter behavior, OpenIBR can help resolve long-standing bottlenecks and accelerate the safe integration of inverter-based resources and large electronic loads. Developers, utilities, and regulators can plan around a shared, verifiable design, not a patchwork of proprietary black boxes.