hls paper presents a novel trend toward retirement of the strong oscillations
which may exist if the power system is exposed to Subsynchronous Resonance(SSR)
phenomenon. Since these harmful oscillations are mainly due to the oscillatory modes of
the turbo-generator shaft, the idea of this trend is to suggest an approp~iate design of the
shaft-parameters such that the SSR phenomenon may be fundamentally avoided. The
effect of shaft parameters like the spring constant and the inertia constant on the shape
and location of these oscillatory modes is extensively studied. Modal analysis, eigenvalue
analysis, and nonlinear time simulation are used as tools to design a turbo-generator shak
which achieve minimum oscillations. Practical constraints are raken In consideration in a
way that the proposed design can be agreeably manufactured