Aanalysis of the impact of grid-forming doubly-fed induction generator parameter on transient stability and small-signal stabilityOA

The Grid-Forming Doubly-Fed Induction Generator(GFM-DFIG)has attracted considerable attention due to its capabilities in voltage self-regulation and inertia support,although stability concerns persist.Transient stability is mainly governed by grid-forming control,whereas small-signal stability is more affected by both the grid-forming control and the current control loop.This paper offers a thorough investigation into how short-circuit ratio(SCR)and system parameters affect the stability of GFM-DFIG,combining transient stability and small-signal stability analyses.First,a full-order model of the GFM-DFIG is established,followed by a reduced-order transient model.Using the transient model,the transient stability limit voltage(TSLV)under permanent fault conditions is calculated,providing a key benchmark for evaluating the generator’s transient stability.A detailed quantitative analysis is then conducted to explore the effects of SCR and parameter variations on the transient stability boundary.Next,small-signal stability is assessed through eigenvalue trajectories and damping ratios,revealing the impact of various parameters.The findings show that optimizing parameter settings can enhance both transient stability and small-signal stability.Finally,simulations are performed to validate the accuracy of the theoretical analyses.