The authors wish to express their appreciation to their families, in particular to wives Wendy Fuchs and Roshanak Masoum, sons Franz Fuchs, Amir and Ali Masoum, and daughters Heidi Fuchs and Maryam Masoum for their help in shaping and proofreading the manuscript. In particular, the encouragement and support for research at the University of Colorado by Dipl.-Ing. Dietrich J. Roesler, formerly with the US Department of Energy, Washington DC, who was one of the first professionals coining the concept of power quality more than 32 years ago, is greatly appreciated. Lastly, the work initiated by the late Professor Edward A. Erdelyi of the University of Colorado, doctoral advisor to Ewald F. Fuchs, is reflected in part of this book.

Mohammad A.S. Masoum, Professor[email protected][email protected], Curtin University, Department of Electrical and Computer Engineering, GPO Box U1987, Perth, WA 6845, Australia

Ewald F. Fuchs, Professor[email protected][email protected], University of Colorado, Department of Electrical, Computer, and Energy Engineering, Campus Box 425, Boulder, CO 80309, USA

July 2015