The contents of this book are intended for those concerned with the simulation of the performance of generation systems. The subject is of importance to practising electrical engineers because of the many situations that arise in the design and operation of modem electromechanical systems and electrical power systems. The simulation programs contained in this book cover the prediction of generator performance for both large and small scale units. Synchronous generators of the round rotor and salient-pole variety of ratings of between a few Megawatts to around 1200 MW are invariably used by public supply companies for the generation of electrical power. For industrial purposes a variety of types of generator are used, including steam and gas turbines, and medium to low speed diesel engine driven generators, the former for those cases where process steam is available and the latter often in the role of marine generation or in a standby role.