Power system stability improvement considering drive train oscillations of virtual synchronous generator?regulated type?4 wind turbines

The type-4 wind turbine generators (WTGs) can provide inertial frequency response by implementing the virtual synchronous generator (VSG) concept. However, unstable torsional oscillations (TOs) would be induced in multi-mass-spring drive-train which destabilize entire power system. In this study, participation factor analyses are performed for a system inclusive of thermal unit and aggregated WTG system's eigenvalues characterized possible detrimental impacts TOs on inertia provision process overall stability demonstrated related limits identified. A comprehensive active damper (CA-TOD) supercapacitor-based energy storage (ESS) presented discussed to implement CA-TOD. state charge (SoC) regulator is also employed set reference speed difference turbine-generator. Small-signal studies electro-magnetic transient (EMT) simulations evaluate functionality CA-TOD SoC controller estimate their dynamics. robust performance compared band-pass filter-based TOD sweeping key control parameters VSG emulating parameter uncertainty. Key results cross-verified EMT multimachine