Contributions to the control and dynamic optimization of processes with varying delays

Abstract : This Ph.D. work studied the control and optimization of dynamical systems subject to varying time delays.State and control time delays are a well-known problem in control theory, with a potential to decrease performances during transient regimes, or even to jeopardize controllers closed-loop stability. Such variable delays play a key role in many applications in process industries.In a first part, we studied the closed-loop control of a system subject to varying and uncertain metrology delays. We established new results on robust stability under explicit conditions on the controller gain. In a second part, we tackled the problem of the dynamic optimization of systems exhibiting input dependent delays due to transport phenomena in complex hydraulic architectures. We designed an iterative optimization algorithm and guaranteed its convergence through a detailed analysis.
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Charles-Henri Clerget. Contributions to the control and dynamic optimization of processes with varying delays. Automatic Control Engineering. PSL Research University, 2017. English. ⟨NNT : 2017PSLEM053⟩. ⟨tel-01822877⟩

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