| Title |
A Study on the Possibility and Countermeasures of Sub Synchronous Oscillation in Korea Power Grid |
| Authors |
신정훈(Jeong-Hoon Shin) ; 조윤성(Yoon-Sung Cho) ; 허견(Kyeon Hur) ; 맹종호(Jong-Ho Maeng) ; 박상호(Sang-Ho Park) |
| DOI |
https://doi.org/10.5370/KIEE.2025.74.11.1810 |
| Keywords |
Weak Grid; Sub Synchronous Oscillation; Grid Code; IBRs; Dynamic Reactive Power Support |
| Abstract |
On April 28, 2025, Spain experienced Sub-Synchronous Oscillation (SSO) caused by high penetration of inverter-based renewable energy in a weak grid environment with low Short Circuit Ratio (SCR), along with a blackout. This study simulates a comparable event in the Korean power grid using PSS/E. A three-phase fault in the Anjwa region resulted in voltage oscillations. After the voltage exceeded 1.1 pu, which led to the tripping of 6 GW of renewable generation, the frequency dropped below 59.3 Hz, causing a further 4.5 GW of renewable generation to disconnect. STATCOM and GFM-ESS were implemented to mitigate voltage oscillations through dynamic reactive power support. Further analysis using PSCAD on a simplified grid revealed that the Power Plant Controller (PPC), combining VQ and PF control, effectively resolved the oscillation problem. |