Advantages:
- Improves system stability even with well-designed individual IBR controllers
- Introduces a coordinated voltage feedback control to mitigate oscillations
- Works across multiple testbeds and conditions, including 3–7 Hz disturbances
- Proven in both simulations and hardware for real-world performance validation
Summary:
As inverter-based resources (IBRs) become more prevalent in modern power grids, particularly in weak grid areas, conventional control strategies increasingly struggle to prevent harmful oscillations and maintain stability, especially near the system's steady-state power transfer limits. Even when individual inverters are properly tuned, grid-wide instabilities can still arise under conditions such as low short-circuit ratios or external disturbances.
This technology introduces a coordinated control strategy in which one or more IBRs modulate their reactive current in response to high pass filtered voltage feedback. This dynamic adjustment of the q-axis current reference effectively damps oscillations and supports system stability. The approach improves both small- and large-signal performance and has been validated through extensive electromagnetic transient simulations and real-world hardware testing. The result is a robust, scalable, and easy-to-implement solution for utilities and grid operators seeking to ensure reliable renewable integration and grid performance.
This image shows three voltage feedback control schemes tested on inverter-based resources (IBRs). By modulating reactive current using high pass filtered voltage input, the coordinated control improves stability across different weak grid scenarios.
Desired Partnerships:
- License
- Sponsored Research
- Co-Development