Invention Reference Number
This technology provides a synchronization control method for microgrids with grid-forming inverters that enhances both the stability and speed during interconnection, whether between microgrids or with the main utility grid. By reducing harmful transients, the method enables seamless transitions across operating modes. This approach minimizes power quality disruptions and unplanned black start caused by inverter tripping and supports resilient uninterrupted power delivery. This method strengthens the reliability and robustness of distributed energy systems during transition events.
Description
The innovation introduces an adaptive synchronization process for microgrids operating with grid-forming inverters. Seamless interconnection between grid-forming inverter, or between grid-forming inverters and the bulk grid, typically faces differences in phase, frequency, and voltage, which can cause damaging overcurrents, oscillations, or even system shutdowns. This method overcomes those challenges by dynamically adjusting inverter control parameters and aligning system conditions in real time. Unlike conventional passive relay-based synchronization, which may require minutes to complete, this approach maintains continuous readiness, enabling reconnection within seconds. The method further enhances stability by dynamically adapting the grid-forming inverter’s virtual impedance prior to synchronization, ensuring smoother transitions between islanded and interconnected operation. This reduces stress on critical power electronics, minimizes transient disturbances, and strengthens the resilience of distributed energy resources.
The method applies across multiple microgrid configurations, and scales, from single-phase to three-phase systems, and can support diverse energy assets such as energy storage inverters and other power-electronic based generation with grid forming controls.
Benefits
- Enables seamless synchronization between grid-forming assets
- Faster synchronization time, improving system resilience
- Reduced power transients and equipment stress
- Enhanced reliability and continuity of energy supply
- Broad applicability across different inverter-based microgrid systems
Applications and Industries
- Utility and grid operators managing distributed energy resources
- Industrial facilities requiring reliable backup power integration
- Community microgrids seeking improved resilience
- Renewable energy projects integrating storage and inverter-based assets
- Microgrid controller solutions managing fleets of networked microgrids
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
