An induction machine damping unit for damping SSR in a series compensated power system

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.