Pole-assignment adaptive stabiliser

Abstract

A fixed gain power system stabiliser is inadequate to provide acceptable damping characteristics as the operating point changes. For the first time in power system an adaptive Pole Assignment stabiliser is developed to overcome this problem by fixing the poles of the transfer function Gd(s) = Δδ/ΔPm. The development of the control algorithm has been made using the delta operator rather than the shift operator as this removes numerical problems at fast sampling rates. The delta operator also gives transfer functions very similar to those of the continuous system and, therefore allows simplifications of the control design by reducing the order of the numerator of the discrete-time transfer function. Comparative results of the adaptive Pole Assignment controller and a fixed parameter stabiliser show the improvement in response obtained with the adaptive algorithm as the operating point changes.