| Title |
Power Transfer Stability Analysis of Grid Forming Converters |
| Authors |
이성전(Seong-Jeon Lee) ; 곽주식(Joosik Kwak) ; 이규섭(Gyu-Sub Lee) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.9.1451 |
| Keywords |
Grid forming converter; Short circuit ratio; Stability analysis; Voltage sourced converter; X/R Ratio |
| Abstract |
With the growth of renewable energy sources (RES) and energy storage systems (ESS), the number of distributed generators (DGs) integrated into power systems via voltage source converters (VSCs) has been increasing. VSCs are operated either in grid-following (GFL) or grid-forming (GFM) control modes. While the GFM mode offers the advantage of not requiring a phase-locked loop (PLL) for grid synchronization, it exhibits a stability issue when the grid impedance decreases. To analyze the stability concerns of GFM inverters, a PSCAD simulation-based study was conducted considering the short-circuit ratio (SCR) and the grid impedance X/R ratio (the ratio of inductive to resistive impedance). The results demonstrate that GFM inverters become more unstable as the SCR increases and the X/R ratio decreases. |