A practical method for assessing the performance of control loops subject to random load changes

A method is described for detecting load changes and characterizing subsequent responses in single-input-single-output (SISO) feedback control loops. The method is computationally simple and suitable for on-line implementation in a controller. Load changes are detected using a statistical change det...

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Bibliographic Details
Published inJournal of process control Vol. 15; no. 4; pp. 393 - 405
Main Author Salsbury, Timothy I.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2005
Subjects
Control performance assessment
HVAC systems
Load change detection
Control performance assessment
HVAC systems
Load change detection
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ISSN0959-1524
1873-2771
DOI10.1016/j.jprocont.2004.08.004

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Summary:A method is described for detecting load changes and characterizing subsequent responses in single-input-single-output (SISO) feedback control loops. The method is computationally simple and suitable for on-line implementation in a controller. Load changes are detected using a statistical change detection procedure that uses zero-crossings information to account for autocorrelation. Responses are characterized by a normalized index that can be related to a damping ratio in a second-order model. Results are presented from applying the method to data from a simulated control loop and two temperature control loops in a large office building.
ISSN:0959-1524
1873-2771
DOI:10.1016/j.jprocont.2004.08.004