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Inclusion of input saturation in the design of dynamically operable plants
Bibliography: leaves 109-113.
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2014
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| _version_ | 1867613244712026113 |
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| access_status_str | Open Access |
| author | Baker, Rhoda |
| author2 | Swartz, Chris |
| author_browse | Baker, Rhoda Swartz, Chris |
| author_facet | Swartz, Chris Baker, Rhoda |
| author_sort | Baker, Rhoda |
| collection | Thesis |
| description | Bibliography: leaves 109-113. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/5343 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:04.194Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/5343 Inclusion of input saturation in the design of dynamically operable plants Baker, Rhoda Swartz, Chris Chemical Engineering Bibliography: leaves 109-113. Dynamic operability reflects the quality with which a plant can be controlled using feedback, and is a function of both the design of the plant and its associated control system. A plant designed on the basis of steady-state considerations alone could exhibit poor dynamic characteristics, leading to a loss of economic performance and a reduced capacity to effectively handle safety and environmental constraints. This motivates the need for the development of quantitative techniques for dynamic operability assessment, as well as its incorporation into procedures for process plant design. Optimization-based approaches to dynamic operability assessment permit simultaneous consideration of performance-limiting factors of nonminimum phase characteristics, input constraints and model uncertainty, and also provide considerable flexibility in the choice of performance criteria, decision variables and constraints. Recent work has incorporated operability requirements as constraints within a single optimal plant design problem formulation (Mohideen et at., 1997; Bahri et at.,1996). Young and Swartz (1997) considered the rigorous inclusion of input saturation effects in optimizing control. Actuator saturation introduces discontinuities in the system model and, to avoid potential problems using a sequential optimization approach, two alternative formulations were proposed for solving the problem within a simultaneous solution framework. Input saturation discontinuities were handled by the introduction of slack variables and their inclusion in either bilinear or mixed-integer constraints resulting in a nonlinear or mixed-integer linear programming problem respectively. The formulations were applied to a linear system with dead time to find the economically optimal operating point for a controller with fixed structure and tunings when disturbance deviations are taken into account. It was shown that using a strictly linear controller in this case would lead to an overly conservative estimate of the feasible operating range and consequently, a suboptimal operating point. 2014-07-31T11:12:29Z 2014-07-31T11:12:29Z 2000 Master Thesis Masters MSc http://hdl.handle.net/11427/5343 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Baker, Rhoda Inclusion of input saturation in the design of dynamically operable plants |
| thesis_degree_str | Master's |
| title | Inclusion of input saturation in the design of dynamically operable plants |
| title_full | Inclusion of input saturation in the design of dynamically operable plants |
| title_fullStr | Inclusion of input saturation in the design of dynamically operable plants |
| title_full_unstemmed | Inclusion of input saturation in the design of dynamically operable plants |
| title_short | Inclusion of input saturation in the design of dynamically operable plants |
| title_sort | inclusion of input saturation in the design of dynamically operable plants |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/5343 |
| work_keys_str_mv | AT bakerrhoda inclusionofinputsaturationinthedesignofdynamicallyoperableplants |