Hierarchical Grid-Interactive Power Performance Enhancement Method for D-PMSG-Based Virtual Synchronous Wind Turbines

Virtual synchronous generator (VSG) control is widely applied in grid-interactive inverters due to its similarity to synchronous generators. The VSG frequency variation is delayed by the synchronous swing equation to provide additional inertia support, which also leads to a slower power response. When applied to wind turbines (WTs), VSG reduces their power tracking ability, compromises the wind power capture efficiency, and affects the dispatch commands execution. The response to external frequency causes more power changes in WTs, making it difficult for wind power capture to keep up due to the mass of the rotor and blades, bring extra operational risks for WTs. To address these issues, this paper proposes a hierarchical gridinteractive power performance enhancement method for DPMSG-based virtual synchronous wind turbines (VSWTs). The power performance is enhanced by coordinating the synchronous swing equation and voltage excitation equation parameters. The grid-forming power flow and electromechanical status of the VSWT are integrated to extend the kinetic energy (KE) utilization limits to ensure the efficiency and safety of the VSWT during the KE utilization-based wind power capture regulation. The proposed method comprehensively improves the gridinteractive power performance of VSWTs, and the effectiveness has been validated through comparative simulations.