  In this paper, an enhancement to the well known Phasor Power Oscillation
Damper is proposed, aiming to increase its performance. Fundamental to the
functioning of this controller is the estimation of a phasor representing
oscillatory behaviour at a particular frequency in a measured signal. The
phasor is transformed to time domain and applied as a setpoint signal to a
controllable device. The contribution in this paper specifically targets the
estimation algorithm of the controller: It is found that increased estimation
accuracy and thereby enhanced damping performance can be achieved by
introducing a prediction-correction scheme for the estimator, in the form of a
Kalman Filter. The prediction of the phasor at the next step is performed based
on the control signal that is applied at the current step. This enables more
precise damping of the targeted mode.
  The presented results, which are obtained from simulations on a
Single-Machine Infinite Bus system and the IEEE 39-Bus system, indicate that
the proposed enhancement improves the performance of this type of controller.
