Minimization of Power System Stabilizer Torsional Interaction on Large Steam Turbine-Generators

A unique filter design is reported which, when used in a Power System Stabili minimizes the stabilizer effect at the shaft torsional natural frequencies. The results of analytical studies illustrating the requirement to reduce such interaction and the effectiveness of the new filter for a specific application are presented. Field tests which support the conclusions of the analytical studies are included. An associated monitoring function is described which provides protection against torsional instability in the event of critical component failure in the stabilizer. Implementation considerations are discussed.