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Parameter optimization in linear systems with arbitrarily constrained controller structure

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2 Author(s)
Wenk, C.J. ; University of Connecticut, Storrs, CT, USA ; Knapp, C.

An algorithm is given for optimization of constant parameters in the controller for a time-invariant linear system. The algorithm may be applied to linear controllers of arbitrary structure with any degree of decentralization in the distribution of information. Most important, it is not necessary to provide an initial controller of the specified structure which stabilizes the system. Rather, the structural constraints are initially relaxed to whatever degree necessary to obtain a stabilizating controller. agorithm then gradually restores the constraints, converges to a local optimum solution, when one exists, and stabilizes any open-loop system possessing a controllable unstable subspace. The necessary conditions which the optimum parameters must satisfy are developed for the arbitrarily constrained controller. The method of satisfying these necessary conditions involves use of a standard conjugate direction search together with a combined multiplier and penalty method for invoking the structural constraints. While attention is focused on the deterministic control problem, it is noted that systems with driving disturbances and measurement uncertainty may be handled with no significant modification of the algorithm. The result is a very practical tool for system design via parameter optimization.

Published in:

Automatic Control, IEEE Transactions on  (Volume:25 ,  Issue: 3 )

Date of Publication:

Jun 1980

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