Process control system
OwnerKetil Strand Anderson, Erik Wilsher +2inventors
InventorsKetil Strand Anderson, Erik Wilsher, Magne Hillestad, Svein Olav Hauger
Life of this patent
Estimating the term…
Abstract
The invention relates to a control system, especially one for use in the control of industrial plant such as a polymerisation reactor. In particular, the invention provides a method of controlling a process comprising the steps of: a) generating a first-principle model corresponding to the process; b) inputting data describing the current and desired future process conditions; c) generating a linear approximation to the model which is valid for said current conditions; d) using said linear approximation to determine an approximate solution to a control problem related to the process; and e) controlling the process using said approximate solution.
Claims10
A method of controlling a process comprising the steps of:
- a) generating a first-principle model corresponding to the process;
- b) inputting data describing the current and desired future process conditions;
- c) generating a linear approximation to the model which is valid for said current conditions;
- d) using said linear approximation to determine an approximate solution to a control problem related to the process;
- and
- e) controlling the process using said approximate solution.
A method as claimed in any preceding claim wherein the approximate solution thereby determined is used to determine a more precise solution.
A method as claimed in any preceding claim wherein the first-principle model is used to calculate a control response.
A method as claimed in any preceding claim wherein the generation of linear approximation to the model is repeated as required using new input data.
A method as claimed in any preceding claim wherein the process is a polymerisation process.
A control apparatus for controlling a process comprising a controller, input and output means and a model, wherein:
- a) said model is a fundamental model corresponding to the process;
- b) means is provided for inputting data describing the current and desired future process conditions;
- c) means is provided for calculating a linear approximation to the model which is valid for said input conditions;
- d) means is provided for using said linear approximation to determine an approximate solution to a control problem related to the process;
- e) means is provided to generate output signals for controlling the process using the solution of part (d) above.
Dependencies are inferred from the claim text.