This book is intended for researchers, teachers, and students willing to ex-
plore conceptual bridges between the fields of Automatic Control and Power
Electronics. The need to bring the two disciplines closer has been felt, for
many years, both by Power Electronics specialists and by Automatic Control
theorists, as a means of fruitful interaction between the two scientific com-
munities. There have, certainly, been many steps given in that direction in
the last decade as evidenced by the number of research articles in journals,
special sessions in conferences, and summer courses throughout the world.
