This book is the fully revised and updated second edition of Power System Dynamics and Stability (Wiley, 1997). As well as providing essential information on the physical understanding of complex dynamics, explained using simplified models, the book now includes important recent developments in power system technology. These are flexible alternating current transmission systems (FACTS), wide-area monitoring systems (WAMS) and devices enabling the efficient integration of renewable and distributed generated power into the national grid. There is also an analysis of how to control and limit power system failure, examining the stability and reliability of modern power systems. Overall, it is a practical guide to the field with mathematical models using MATLAB and SIMULINK and simulation techniques.