Full-Topology Real-Time Simulation Modeling Method and the Application in Super-Synchronous Oscillation Analysis of Large-Scale Offshore Wind Farms

In response to an actual super-synchronous oscillation event in an offshore wind farm, this paper proposes a full-topology real-time simulation (FTRT) scheme based on a self-developed universal link library execution device. The technical challenges of FTRT are systematically analyzed, and a complete modeling and implementation methodology is established. Using this scheme, a hardware-in-the-loop real-time simulation platform incorporating the same type of field controller is built, and the 70 Hz voltage oscillation is accurately reproduced. The analysis reveals that the submarine-cable-based transmission network possesses an inherent resonance point in the super-synchronous frequency band. The system stability boundary is then evaluated by comparing the phase–frequency characteristics of the grid-side and wind-farm impedances. Finally, oscillation suppression measures, including controller parameter unification, impedance reshaping, and SVG (Static Var Generator) deployment, are proposed and verified. The adopted FTRT technology overcomes the accuracy limitations of conventional offline simulations and simplified mechanism analyses, and the results can provide reliable, direct engineering decision support for the planning, design, and operation of offshore wind farms.