ABSTRACT
This chapter describes the basics of direct current (DC) machines, synchronous machines, induction machines, transformers, circuit breakers, power systems analysis, and power systems control. It presents an overview of the power system stability phenomena including physical concepts, classification, and definition of related terms. Electric machines are necessary for electric power generation. Field winding is an exciting system that may be an electrical winding or a permanent magnet and is located on the stator. In the motoring operation the DC machine is made to work from a DC source and to absorb electrical power. The torsional oscillations in the subsynchronous range could, under certain conditions, interact with the electrical system in an adverse manner. An induction motor or asynchronous motor is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction. Induction generators and motors produce electrical power when their shaft is rotated faster than the synchronous frequency.
