The Effects of Prime-Mover and Excitation Control on the Stability of Large Steam Turbine Generators

The increasing sizes of steam-turbine generators, and the increasing reactances of the transmission systems that interconnect them, are rapidly aggravating the problems of both transient and dynamic stability, but the design requirements for these two areas can conflict. The valuable contribution that contintiously-acting excitation control can make towards the alleviation of these problems is widely acknowledged, whilst this paper demonstrates that the exploitation of the potentialities of electro-hydraulic governing systems may be expected to reduce the stringency of the requirements made on excitation systems.