Dynamic Transfer Among Alternative Controllers

Stefan F Graebe and Anders Ahlén

12th IFAC World Congress, Sydney, Australia, July 19-23, 1993.

Abstract:

Advanced control strategies and modern consulting provide new challenges for the classical problem of bumpless transfer. It can, for example, be necessary to transfer between an only approximately known existing analogue controller and a new digital or adaptive controller without accessing any states. Transfer ought to be bi-directional and not presuppose steady state, so that an immediate back-transfer is possible if the new controller should drive the plant unstable.

In this paper we present a scheme that meets these requirements. By casting the problem of bi-directional transfer into an associated control problem, systematic analysis and design procedures from systems theory can be applied. The paper includes laboratory and industrial applications.

Related publications:

Book Chapter in CRC Control Handbook 1996 on the above theme.
Paper IEEE Trans. CST, on the above theme.
Report on a systematic technique for scalar anti-windup design.
Conference paper (Reglermöte 96) on multivariable antiwindup design.