Constraint and limit feasibility handling in a process control system optimizer
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United States of America Patent
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Feb 26, 2008
Grant Date -
Mar 11, 2004
app pub date -
Jun 19, 2003
filing date -
Sep 11, 2002
priority date (Note) -
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Abstract
An optimization technique for use in driving a process plant controller, such as a model predictive controller, uses an organized, systematic but computationally simple method of relaxing or redefining manipulated, control and/or auxiliary variable constraints when there is no feasible optimal solution within pre-established constraints, to thereby develop an achievable solution for use by the controller. The optimization routine uses penalized slack variables and/or redefines the constraint model in conjunction with the use of penalty variables to develop a new objective function, and then uses the new objective function to determine a control solution that bests meets the original constraint limits.
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