Assessmentof controller performance: a relay feedback approach
Resource
Chemical Engineering Science 58(2), 497-512
Journal
Chemical Engineering Science 58(2)
Pages
497-512
Date Issued
2003
Date
2003
Author(s)
Thyagarajan, T.
Yu, Cheng-Ching
Huang, Hsiao-Ping
DOI
246246/2006111501232996
Abstract
Assessment of control loop performance is one of the important tasks to be carried out in a plant, regardless of the control strategy. The
present work utilizes the shape information from single relay feedback test to assess the performance of a feedback system. The process
considered is a typical 2rst-order plus dead time process and the controller used is PI type of controller. An ideal relay is introduced in the
feedback loop before the controller. The shape of the relay output characterizes the performance of the controller. The mismatch in the
integral time can also be observed from the shape. Based on the shape information, analytical expressions for relay feedback responses
are derived and straightforward procedures are evolved to assess the performance of the controller. The proposed scheme assesses the
controller performance and computes the new tuning parameters, in case retuning of the controller is necessary. The robustness of the
method is also tested for second-order plus dead time as well as for higher order systems. More importantly the present approach employs
only one relay test for (1) assessment and (2) retuning of the controller. It provides a reliable way that is compatible even to a non-expert
operator to assess the controller performance.
Subjects
Relay feedback
Performance assessment
Monitoring
Autotuning
Intelligent control
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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