A synchrophasor measurement based method for assessing damping torque contributions from power system stabilizers

This paper proposes a method for assessing the damping torque contribution of generators equipped with power system stabilizers (PSSs) using synchrophasor measurements from disturbance events exhibiting lightly damping oscillations. The method is based on an extension to the Heffron-Phillips and deMello-Concordia synchronizing and damping torque analysis method to include the sensitivities for the terminal bus voltage angle. It requires only examining the phase relationship between the oscillatory components of the generator rotor angle and its terminal bus voltage angle. The method can also be applied to time responses from simulation programs.