Comparative SSR Results of Using a Doubly-fed Induction Generator-based Offshore Wind Farm and a Steam Turbine Generator System Connected to the Same Series-Capacitor Compensated Network

This paper compares subsynchronous resonance (SSR) results in two power generation systems (PGSs). One is a traditional steam turbine generator (STG) system based on a synchronous generator (SG), and the other is an offshore wind farm (OWF) system based on an equivalent aggregated doubly-fed induction generator (DFIG) driven by an equivalent aggregated wind turbine. The d-q axis equivalent-circuit models of the two PGSs under three-phase balanced loading conditions are derived to establish the complete system models, including the STG-based PGS, the DFIG-based OWF PGS, the electrical network of the IEEE Second Benchmark Model (SBM), system-1. The studied two PGSs' small-signal stability and transient simulation results are systematically performed and compared. The simulation results show that the special unstable modes in the two studied configurations can cause unstable SSR characteristics.