The materials presented in this work are based on the notes used in courses taught sporadically to
graduate students and practicing engineers over a period of thirty-five years. The objective here
is to present the fundamental materials and concepts in power system stability in a tutorial form
The materials covered were dictated by the need of the course attendees. This is certainly not an
exhaustive treatment of all aspects of the subject found in the literature. Some of the topics
usually found in text books on power system stability are not covered. For example, detailed
descriptions and workings of excitation and governor control systems are not included. However,
the effect of excitation control on stability has been covered in some detail.