Stability Comparison between Hybrid-Synchronous Controlled and Droop Controlled Grid-Forming Inverters Under Varying Grid Short-Circuit Capacity Ratio

This paper first analyzes and compares the small-signal stability of hybrid synchronous control (HSC) and general droop control under grid short-circuit ratio (SCR) variation conditions using impedance analysis. It is found that the hybrid synchronous control can enhance the stability of the grid-forming inverter under strong grid for the grid SCR variation, and the simulation simulation results prove the findings.