Reduction of Oscillations in Generator Turbine due to Sub- Synchronous Resonance by using Fuzzy Controller

Whenever a series compensated transmission line is connected across the transmission line there exists a problem known as Sub-Synchronous Resonance at particular impedance. This will lead to damage of the turbine shafts and other major parts of the generator. So, this can be avoided by the use of the FACTS devices(1,2) supplemented with the auxiliary control devices(3-7). Many FACTS controllers have been proposed by using GCSC, TSSC,TCSC etc., But, the damping can be best obtained by the use of the Distributed Static Series Compensator along with controlled with the Fuzzy Logic based Damping Controller(FLDC). This paper mainly deals with the reduction of the oscillations that occur due to the SSR by using FLDC and also the comparison is made with the convention\al PI controller in order to get best view of the performance of FLDC. Key Terms: D-FACTS, SSR, FLDC, PI Controller