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A robust multi-model predictive controller for distributed parameter systems
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DOI：10.1016/j.jprocont.2011.10.008.png)
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摘要
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In this work a robust nonlinear model predictive controller for nonlinear convection-diffusion-reaction systems is presented. The controller makes use of a collection of reduced order approximations of the plant (models) reconstructed on-line by projection methods on proper orthogonal decomposition (POD) basis functions. The model selection and model update step is based on a sufficient condition that determines the maximum allowable process-model mismatch to guarantee stable control performance despite process uncertainty and disturbances. Proofs on the existence of a sequence of feasible approximations and control stability are given. Since plant approximations are built on-line based on actual measurements, the proposed controller can be interpreted as a multi-model nonlinear predictive control (MMPC). The performance of the MMPC strategy is illustrated by simulation experiments on a problem that involves reactant concentration control of a tubular reactor with recycle. (C) 2011 Elsevier Ltd. All rights reserved.
Keyword:
Plant model mismatch
Proper orthogonal decomposition
Controller stability
Projection methods
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