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Chemical Product and Process Modeling

Ed. by Sotudeh-Gharebagh, Rhamat / Mostoufi, Navid / Chaouki, Jamal

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Estimating Output Variance in Closed Loop Systems

Ming T. Tham
  • School of Chemical Engineering and Advanced Materials, Newcastle University, UK
/ Richard W. Jones
  • Mads Clausen Institute for Product Innovation, Southern Denmark University, Sonderborg, Denmark
/ Ibrahim Al-Hinai
  • Petroleum Development Oman, Oman
Published Online: 2007-03-07 | DOI: https://doi.org/10.2202/1934-2659.1026

This paper attempts to address a common difficulty encountered when trying to justify a process control revamp or upgrading project — the ability to quantify potential savings/profits. A relatively simple procedure that is applicable to both continuous and digital controllers is described. Given models of the process and the controller, knowledge of the disturbance frequencies and their variances, the method is able to predict accurately the variance of the controlled output of linear control systems.

Keywords: output variance; control benefits assessment; control performance

Published Online: 2007-03-07

Citation Information: Chemical Product and Process Modeling. Volume 2, Issue 1, ISSN (Online) 1934-2659, DOI: https://doi.org/10.2202/1934-2659.1026, March 2007

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