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A Review of Plantwide Control
 Internal report EU CAPENET project (TWG 5
, 1998
"... Most (if not all) available control theories assume that a control structure is given at the outset. They therefore fail to answer some basic questions that a control engineer regularly meets in practice (Foss 1973): "Which variables should be controlled, which variables should be measured, which in ..."
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Cited by 4 (1 self)
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Most (if not all) available control theories assume that a control structure is given at the outset. They therefore fail to answer some basic questions that a control engineer regularly meets in practice (Foss 1973): "Which variables should be controlled, which variables should be measured, which inputs should be manipulated, and which links should be made between them?" These are the question that plantwide control tries to answer. There are two main approaches to the problem, a mathematically oriented approach (control structure design) and a process oriented approach. Both approaches are reviewed in the paper. Emphasis is put on the selection of controlled variables, and it is shown that the idea of "selfoptimizing control" provides a link between steadystate optimization and control. We also provide some definitions of terms used within the area of plantwide control. This paper is an unpublished internal report which was written as part of the European Union CAPE.NET project (wor...
A Review on Process Controllability
 Proceedings of the IFAC Symposium on Analysis, Design and Evaluation of ManMachine Systems
, 1998
"... : Definitions of terms used within process flexibility design and controllability assessment are given and their relations discussed. Methods for controllability evaluation and methodologies for integrating these into the design process are reviewed for some modes of operation. Basically two types o ..."
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: Definitions of terms used within process flexibility design and controllability assessment are given and their relations discussed. Methods for controllability evaluation and methodologies for integrating these into the design process are reviewed for some modes of operation. Basically two types of evaluation and design methods prevail; One type is based upon linear model analysis, whereas another type is based upon physical chemical insight and thus provides nonlinear information. In process design practice the plant piping and instrumentation diagram evolves iteratively using mainly experience and process reasoning to address questions related to plant controllability. It would be desirable to be able to address such questions more quantitatively at different abstraction levels during process design such that controllability evaluation can be integrated into the design process. This paper is an unpublished internal report, which is produced within the EU CAPE.NET project (working...
Towards Integration of Controllability into Plant Design
"... In process design practice the plant piping and instrumentation diagram evolves iteratively using mainly experience and process reasoning to address questions related to plant controllability. It would be desirable to be able to address such questions more quantitatively at different abstraction ..."
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In process design practice the plant piping and instrumentation diagram evolves iteratively using mainly experience and process reasoning to address questions related to plant controllability. It would be desirable to be able to address such questions more quantitatively at different abstraction levels during process design suchthatcontrollabilityevaluation can be integrated into the design process. Only few attempts have been reported towards integrating controllabilityinvestigations into early stages of plant design. This paper reviews literature on controllability from the perspectiveofcontrollability assessment with the aim of identifying tests, whichmay be used at different stages of plant design. First definitions of terms used within process flexibility design and controllability assessment for control structure design are given. Methods for controllabilityevaluation are reviewed for some modes of process operation. Basically twotypes of evaluation and design methods p...
Interaction of Design and Control: Optimization with Dynamic Models
, 1997
"... Process design is usually approached by considering the steadystate performance of the process based on an economic objective. Only after the process design is determined are the operability aspects of the process considered. This sequential treatment of the process design problem neglects the fact ..."
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Process design is usually approached by considering the steadystate performance of the process based on an economic objective. Only after the process design is determined are the operability aspects of the process considered. This sequential treatment of the process design problem neglects the fact that the dynamic controllability of the process is an inherent property of its design. This work considers a systematic approach where the interaction between the steadystate design and the dynamic controllability is analyzed by simultaneously considering both economic and controllability criteria. This method follows a process synthesis approach where a process superstructure is used to represent the set of structural alternatives. This superstructure is modeled mathematically by a set of differential and algebraic equations which contains both continuous and integer variables. Two objectives representing the steadystate design and dynamic controllability of the process are considered. T...