Title :
A new approach to the discretization of continuous-time controllers
Author :
Keller, J.P. ; Anderson, B.D.O.
Author_Institution :
Department of Systems Engineering, Research School of Physical Sciences, Australian National University, G.P.O. Box 4, Canberra, A.C.T., Australia.
Abstract :
A new method for discretising continuous-time controllers is derived, using principles of controller approximation (Anderson & Yi [1]). It focuses on the closed-loop use of the discrete-time controller. The resulting approximation criterion is a measure for stability of the control system, provides an upper bound on the sampling time for which stability can be guaranteed and because it is based on continuous-time controller approximation it indicates the cost of discretization in terms of performance degradation. The discrete-time controller is obtained through minimization of this criterion, which can be performed with standard software used in H¿ controller design.
Keywords :
Australia; Control systems; Costs; Degradation; Open loop systems; Sampling methods; Software standards; Stability criteria; Time measurement; Upper bound;
Conference_Titel :
American Control Conference, 1990
Conference_Location :
San Diego, CA, USA
