High subsynchronous vibrations forced a trip in turbine operation at just 27 MW versus the rated 46 MW. Changes to the bearing clearances and configurations mitigated the vibrations but were not ...

Mechanical damping of the turbine generator (T-G) is higher at higher power level. Subsynchronous torsional interaction (SSTI) depends on the degree of coupling between the HVDC converter and the T-G, ...