海缆参数对海上风电柔性直流送端系统模式谐振的影响OA

Traditional research on modal resonance has primarily focused on renewable energy connected to grid systems in terrestrial applications.However,the offshore wind power VSC-HVDC system exhibits significant parameter differ-ences between submarine cables and overhead transmission lines,necessitating clarification of the influence mechanism of submarine cable parameters on system modal resonance.We investigated the interaction between wind turbine grid-side converter(GSC)and VSC-HVDC converters,and examined the impact patterns of submarine cable capacitance and reactance on modal resonance.Moreover,we elucidated the resonant interaction between grid-following controlled GSC and grid-forming controlled VSC-HVDC converters,and establised analytical mapping relationships among subma-rine cable capacitance/inductance parameters,open-loop modes,and their residues.Critical discoveries indicate that submarine cable capacitance modifies system modal resonance through resonance intensity variation and open-loop mode displacement,thus the oscillation damping is in nonlinear characteristics in VSC-HVDC system,and submarine cable in-ductance amplifies resonance intensity via residue mechanisms;meanwhile,elevated parameters will intensify the resonance severity and degrade system damping.Time-domain simulations confirm theoretical predictions.Therefore,these distinct mechanisms,contrasting fundamentally with overhead transmission lines behaviors,demand pro-ject-specific submarine cable parameter evaluations for effective modal resonance mitigation.