Fuzzy logic based control of STATCOM for mitigation of SSR

Subsynchronous resonance is well known phenomenon in Series compensated transmission line. Flexible AC Transmission System (FACTS) devices can be used to enhance the performance of the transmission line and to mitigate SSR with auxiliary controllers. The use of STATCOM a FACTS device is increasing in the power system for enhancing power transfer capability and dynamic reactive power support in power system. In this paper a Fuzzy logic control method for STATCOM is proposed and applied for damping oscillations caused by SSR. The performance of the proposed controller has been tested on Second bench mark model for SSR studies. Time domain simulations have been carried out with MATLAB/SIMULINK. Significant improvement of damping of torsional oscillations has been achieved with the proposed fuzzy logic supplementary controller.