Adequacy of the Single-Generator Equivalent Model for Stability Analysis in Wind Farms With VSC-HVDC Systems

Due to the complexity of detailed models, single-generator equivalent model (SEM) a wind farm is commonly used facilitate stability analysis. However, adequacy SEM for analysis in direct-drive farms with VSC-HVDC systems still uncertain. Therefore, this article analyzes two aspects: oscillation modes and sub-synchronous (SSO) enhancement by optimizing parameters. Firstly, various critical are characterized according frequency, comparison these between two-generator presented. The effect aggregation on discussed. Then, impact permanent magnet synchronous generator (PMSG) parameters inside-wind-farm/wind-farm-grid SSO explored. It revealed that change PMSG parameters, damping identical. This implies can be improve multi-machine system PSCAD/EMTDC simulations further performed verify theoretical