A new approach to the discretization of continuous-time controllers
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Keller, J. P.
Anderson, B. D.O.
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Abstract
A method for discretizing continuous-time controllers is derived, using principles of controller approximation. It focuses on the closed-loop use of the discrete-time controller. The resulting approximation criterion is a measure of the 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, 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.
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Proceedings of the American Control Conference
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