Mitigation of induction generator effect due to SSR with STATCOM in synchronous generator

Torsional oscillations of the shaft in steam turbine driven synchronous generator is form of Subsynchronous resonance (SSR) in power system. But SSR can also be revealed in the form of induction generator effect (IGE) in power system. This paper analyses the possibility of the IGE effect of SSR in synchronous generators and proposes its mitigation technique. Flexible AC Transmission System (FACTS) devices can be used to enhance the performance of the transmission line. STACOM a FACTS device suitable for enhancing power transfer capability and dynamic VAR support in power system is proposed for the mitigation of SSR due to IGE. The performance of the proposed device has been tested on the IEEE First bench mark model for SSR studies, to mitigate the IGE due to SSR. Time domain simulations have been carried out with DIGSILENT Power Factory for conformation.