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Performance assessment and diagnosis of refinery control loops

Thornhill, NF; Oettinger, M; Fedenczuk, P; (1998) Performance assessment and diagnosis of refinery control loops. In: (Proceedings) AlChE Symposium Series Number 320. (pp. pp. 373-379). : Snowbird, Utah, USA. Green open access

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Abstract

This paper discusses the application of control loop performance assessment (Desborough and Harris, 1992) in a refinery setting. In a large process it is not feasible to tailor the parameters of the algorithm to every individual control loop. A procedure is illustrated for selecting default values which make it possible to implement the technology on a refinery-wide scale. For instance, it is shown that the prediction horizon perameter in the CLPA algorithm can be set so that the analysis is sensitive to the persistent signals that cause loss of performance. Default values are suggested for refinery applications.A frequent cause of loss of performance in a control loop is a persistent oscillation due to a valve nonlinearity or a tuning fault. The paper presents an operational signatures in the form of an estimate of the closed loop impulse response that suggest the causes of such oscillations.

Type: Proceedings paper
Title: Performance assessment and diagnosis of refinery control loops
Event: AlChE Symposium Series Number 320
Open access status: An open access version is available from UCL Discovery
Additional information: Imported via OAI, 14:26:47 5th May 2005
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/537
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