Power electronics systems are physical devices that can be modelled mathematically as controlled dynamical systems. This makes them suitable for the application of existing control theory, particularly in the design of their regulatory subsystems. For years there has been a perceived need to bring the disciplines of power electronics and theoretical control into closer co-operation, demonstrating the potentially great advantages of, at first sight, rather obscure control theory to power specialists while making control technicians better aware of the fundamental needs and limitations of...