5. Transient stability of grid-forming inverters
Huy-Ngoc Duong*, Mohammad Hasan Ravanji, and Behrooz Bahrani - Department of Electrical and Computer Systems Engineering, Monash University, Melbourne
Transient stability of grid-forming inverters
- Power systems are undergoing a transition from traditional synchronous generators to inverter-based resources.
- Grid-forming inverters (GFMIs) are a promising solution for providing synthetic inertia, black-start capability, islanded operation, and reliable performance under weak-grid conditions.
- However, unlike synchronous generators, which can supply fault currents up to 3–5 per-unit (pu), GFMIs are typically limited to 1.2–1.5 pu.
- Therefore, a current limiter is a necessary control component in GFMIs and has a significant impact on their transient stability.
- This poster proposes a framework for estimating the transient stability margin of GFMIs under the influence of current limiters.
- Equal Area Criteria and Lyapunov’s Direct Method are developed for application to GFMIs equipped with current limiters.
- The estimation error of the proposed methods is less than 20%, as benchmarked against Experimental results.