Modeling and control of Type-2 wind turbines for sub-synchronous resonance damping

• Dynamic modeling of Type-2 wind turbines for sub-synchronous resonance studies.
• Systematic design of a power system stabilizer for Type-2 wind turbines.
• Assessment of Type-2 wind turbines to suppress sub-synchronous resonance events.

The rapid increase of wind power penetration into power systems around the world has led transmission system operators to enforce stringent grid codes requiring novel functionalities from renewable energy-based power generation. For this reason, there exists a need to asses whether wind turbines (WTs) will comply with such functionalities to ensure power system stability. This paper demonstrates that Type-2 WTs may induce sub-synchronous resonance (SSR) events when connected to a series-compensated transmission line, and with proper control, they may also suppress such events. The paper presents a complete dynamic model tailored to study, via eigenanalysis, SSR events in the presence of Type-2 WTs, and a systematic procedure to design a power system stabilizer using only local and measurable signals. Results are validated through a case study based on the IEEE first benchmark model for SSR studies, as well as with transient computer simulations.