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http://hdl.handle.net/11375/25885
Title: | CLOSED-LOOP DYNAMIC REAL-TIME OPTIMIZATION WITH STABILIZING MODEL PREDICTIVE CONTROL |
Authors: | Sundaresan Ramesh, Praveen |
Advisor: | Mhaskar, Prashant Swartz, Christopher |
Department: | Chemical Engineering |
Publication Date: | 2020 |
Abstract: | Real-time optimization (RTO) is a supervisory strategy at the upper level of the industrial process automation architecture that computes optimal set-point trajectories that are in turn passed on to the lower-level advanced controller for tracking. In recent times, process industries have been operating plants in an increasingly dynamic environment thus motivating the replacement of the traditional steady-state RTO with a dynamic RTO (DRTO). Conventionally, the DRTO problem involved computing optimal input trajectories without incorporating the e ects of the lower-level controller that motivated the development of a closed-loop DRTO (CL-DRTO). A previously published CL-DRTO strategy optimizes set-point trajectories based on an economic cost function, while including the lower-level MPC calculations with an assumption that the process is open-loop stable. But the economic optimum, in certain process industries, could lead to operating the plant at or around an unstable steady-state. Therefore, the goal of this research is to develop a CL-DRTO formulation that enables handling unstable operating points via an underlying MPC with stability constraints. In this work, we focus on a traditional two-layer DRTO approach due to its close ties to the industrial automation architecture. To this end, a stabilizing MPC that handles trajectory tracking for unstable systems is embedded within the upper-level DRTO, resulting in a multi-level dynamic optimization problem. Subsequently, this optimization problem is reformulated by applying a simultaneous solution approach. The economic bene ts realized by the proposed strategy are illustrated through applications to both linearized and nonlinear dynamic models for single-input single-output (SISO) and multi-input multi-output (MIMO) CSTR case studies. |
URI: | http://hdl.handle.net/11375/25885 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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sundaresanramesh_praveen_202009_masc.pdf | 1.55 MB | Adobe PDF | View/Open |
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