Dynamic Transfer Among Alternative Controllers
and Its Relation to Antiwindup Controller Design
Stefan F Graebe
IEEE Transactions on Control Systems Technology,
vol 4, pp 92-99, January 1996. © 1996 IEEE.
Also: Internal Report UPTEC 94078R, Dept. of Technology,
Undesirable transients are often generated when
a control system switches between different
control strategies. The paper discusses how to handle such
problems, by introducing additional control loops around the
latent (non-active) controllers.
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.
We present a scheme that meets these requirements.
By casting the problem of bi-directional transfer
into an associated tracking control problem,
systematic analysis and design procedures from
control theory can be applied.
The associated control problem also has
a correspondence to the design of antiwindup controllers.
The paper includes laboratory and industrial applications.
- Related publications:
Book Chapter in CRC Control Handbook
1996 on the above theme.
Conference paper (IFAC World
Congress 1993), on the above theme.
Report on a systematic technique
for scalar anti-windup design.
Conference paper (Reglermöte 96)
on multivariable antiwindup design.
Personal use of this material is permitted.
However, permission to reprint/republish this material for
advertising or promotional purposes or for creating new
collective works for resale or redistribution to servers or lists,
or to reuse any copyrighted component of this work in other works
must be obtained from the IEEE.