The Interction of Torsional Reasonances with Network Resonances in Synchronous Generators

Subsynchronous torsional resonances have interacted with subsynchronous network resonances to cause shaft failures-in synchronous generators. But what of their interactions in the supersynchronous span of the frequency spectra? Are they safe? These questions have become relevant as more network resonances are being added to the power system through the increasing use of static VAR compensators and their smoothing filters. The paper offers a few answers to these questions using the phase modulation theory of the torsional interaction phenomenon.