Analytically Validated SSCI Assessment Technique for Wind Parks in Series Compensated Grids

This work highlights limitations in existing screening approaches to assess low-frequency interactions during interconnection studies of grid-connected inverters (GCIs), such as wind power plants. It then proposes a new screening methodology capable of addressing these limitations for realistic representations of power system components and GCIs. It demonstrates that the asymmetric input admittance characteristics of GCIs, whose consideration is required for proper stability assessment, can be accurately extracted with the proposed adequate scanning method implemented in an electromagnetic transient (EMT) software package. This is verified through rigorous validation against analytical formulations developed for field validated type-III and type-IV wind turbine models. It shows that the technique is capable of correctly assessing stability in all presented cases. All results are validated against detailed EMT simulations.