The Tracking Ratio Station

Research output: Contribution to journalArticle

Abstract

In ratio control, the control objective is to keep the ratio between two signals, normally flow measurements, at a desired value in spite of variations in setpoints and load disturbances, and possible control signal saturations. This paper presents a new ratio control scheme, the Tracking Ratio Station, that manages to handle all these situations. It is also able to keep the ratio when one of the controllers takes a local setpoint or is switched to manual control. The Tracking Ratio Station determines the setpoints of the two flow loops so that the one with the largest control error follows the external setpoint, whereas the one with the smallest control error follows the process output of the opposite control loop. The paper illustrates the properties of the Tracking Ratio Station in terms of both simulations and industrial field tests.

Details

Authors
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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Control Engineering

Keywords

  • Ratio control, Ratio Station, Blending, In-line blending, Mixing, Process control, Tracking Ratio Station
Original languageEnglish
Pages (from-to)122-130
Number of pages9
JournalControl Engineering Practice
Volume69
Publication statusPublished - 2017 Dec
Publication categoryResearch
Peer-reviewedYes

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