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Application of series capacitor in long transmission line is a cost effective method to increase power transfer. But presence of series capacitor has sometimes been limited because of the concern for subsynchronous resonance phenomenon in transmission line. SSR is basically an electrical power system condition where the electrical network exchanges energy with the turbine generator at one or more of the natural frequencies of the combined system below the synchronous frequency of the system. Presence of SSR torque causes oscillation which causes shaft fatigue and possible damage or failure of shaft. Long transmission line needs series or shunt compensation for power flow control as well as for mitigating the SSR phenomenon. An idea of this paper is to damp SSR by adding static synchronous series compensator (SSSC, Series device) or Static compensator (STATCOM, Shunt device). This paper shows that damping characteristics obtained by SSSC is better than STATCOM for damping SSR phenomenon. The results are obtained by modelling a lineralized system in MATLAB and study is performed on the system adapted from the IEEE first bench mark model for Eigen value analysis. [ABSTRACT FROM PUBLISHER]

The main focus of this paper is to analyse IMDU characteristics to damp subsynchronous resonance. IMDU is coupled to T-G shaft. The advantage of using IMDU to damp SSR is that we need no other controller. The IEEE First Benchmark Model for subsynchronous studies is used to study eigenvalue analysis and time domain simulations. The time domain simulation study under large disturbances condition is carried out with IMDU located at the HP turbine end of T-G shaft. The coupling coefficient between IMDU and masses were varied, and its effects on SSR mitigation and transient stability were observed. The scheme enhances the system performance considerably and torsional oscillations are damped out at all levels of series compensation [ABSTRACT FROM PUBLISHER]