Co-ordinated single-variable excitation control and governing of turboalternators

The feasibility of implementing a control strategy for the co-ordinated excitation control and governing of an AC turbogenerator is examined. The proposed control scheme uses only one extra control signal, that of rotor acceleration, in addition to the two conventional feedback signals of terminal voltage into the excitation system and rotor-speed deviation into the governing system. Theoretical studies are performed using multivariable function-minimisation techniques which have been extended to include dynamic-sensitivity calculations. An experimental investigation is performed on a laboratory micromachine system to confirm the results of the theoretical investigation. The method gives significant improvements in system performance following a large disturbance, with good correlation between theory and practice