Estimation of Structural Mechanical Damping in Multi-mass of Turbine Generator for SSTI Study

This paper provides a practical method for estimating structural mechanical damping in sub-synchronous torsional interaction (SSTI) analysis with limited information on the generators. The risk of SSTI is generally assessed by comparing turbine generator that electrical system problematic mode frequency domain followed time simulation studies to confirm occurrence interaction. Unfortunately, often neglected simply because data unavailable. Only modal ratio provided practice, and study results incorrect should be misleading. thus presents accurately estimate multi-mass model based Rayleigh Caughey models. Comprehensive both using PSCAD/EMTDC demonstrate accuracy efficacy proposed estimation method. Theoretical aspects applicability two models are also discussed.