• • The LLC-FOVSG resolves the inherent trade-off between active power transient damping and frequency response overshoot that plagues conventional FOVSG, as verified on a 100 kV·A hardware testbed; this eliminates a critical barrier to grid-code compliance for inverter-dominated grids.
• • By embedding a lead-lag correction into the rotor motion equation, the strategy maintains the reduced-order advantage of fractional-order virtual inertia while adding a single tunable parameter, avoiding the nonlinear parameter drift and threshold selection complexity of adaptive control schemes.
• • The small-signal model of the LLC-FOVSG provides a systematic parameter design procedure, replacing the heuristic tuning of prior FOVSG approaches; this reduces commissioning time and ensures repeatable dynamic performance across different grid strengths.
• • Comparative tests confirm that the LLC-FOVSG suppresses active power oscillations without the frequency overshoot observed in FOVSG, directly mitigating the risk of overcurrent protection tripping and power device failure in high-penetration power electronics systems.