Optimal output feedback design of a shunt reactor controller for damping torsional oscillations

Abstract Suppression of the torsional oscillations of a turbogenerator by means of a shunt reactor placed at the turbogenerator terminals has been proposed by others and would appear to be the most promising of all the counter-measures suggested so far. This paper investigates the damping of subsynchronous resonance (SSR) oscillations by using such a shunt reactor stabilizer and placing it at the high voltage instead of the low voltage side of the generator step-up transformer. It shows how the shunt reactor controller (SRC) is designed by employing optimal output feedback techniques. A digitally computed step-by-step solution of the 31 non-linear differential equations yields the transient response of the non-linear system and illustrates the stabilizing effect of the shunt reactor controller, even for an initially unstable plant.