The GIST 2217-Bus Test System: A Public-Data Synthetic Model of the Korean Power Grid

Abstract

No model of the Korean transmission system at native resolution is publicly available, which makes reproducible research on one of the world's most distinctive grids difficult-an islanded interconnection with extreme separation between generation and the Seoul Metropolitan Area load center, low renewable penetration, and heavy reliance on extra-high-voltage (EHV) transmission. Working strictly from public data, and for research purposes only, we present the GIST 2217-bus test system, a geographically grounded synthetic model of the Korean grid. Unlike fully synthetic cases, whose lines match no real corridor, and aggregated public Korean models, it derives its 345 and 154 kV layout from the OpenStreetMap/OpenInfraMap power layer by a multi-source shortest-path reassembly of overhead-line geometry, gap-fills unreachable substations with a geographic minimum-spanning-tree backbone, and calibrates the aggregate circuit length to published national statistics (94/100/109% at 765/345/154 kV). The model spans 2217 buses, 512 generation and renewable sources (144 GW), 3708 AC line circuits plus four high-voltage direct-current (HVDC) converter links, 3324 transformers, and reactive resources (shunts and 11 FACTS devices), serialized to a PSS/E-compatible CSV schema. The model is distributed as a frozen operating point-taps, setpoints, and bus voltages settled once offline and baked into the data-so a single deterministic pandapower Newton-Raphson pass (with reactive limit enforcement and HVDC converter settling) reproduces an 85 GW high demand snapshot at a single connected operating point (mean transmission voltage 0.995 pu, 2.6 % losses), structurally consistent with the independent public KPG193 model. The dataset, maps, and tooling are released as a citable platform for power flow, planning, and decarbonization studies.