Abstract: Aiming at the shortcoming of speed low-pass filter on low frequency performance, the concept of minimizing of torsionals is presented. It reduces torsionals in feedback speed and has no influence on low-frequency performance. Using speed after minimizing of torsionals as feedback, the restraint is reduced considering torsionals stability. The governor can have high response speed and has few effects on torsionals stability. One method of minimizing of torsionals is presented, who is assemble mode. Robustness is analyzed of the method. It is verified using test data from industry site.

Key words: Steam turbine generator, Torsional oscillation Minimizing of torsionals