The growing need to the clean and renewable energy has led to the fast development of wind power
systems all over the world. Large wind farms are going to be connected to electrical networks which have been
series compensated to guarantee the safe and stable transmission of bulk power. However a series compensated
power system may encounter with a very important problem known as subsynchronous resonance (SSR). Flexible ac
transmission systems (FACTS) controllers are widely applied to mitigate subsynchronous oscillations.