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http://dx.doi.org/10.9713/kcer.2020.58.3.390

Control Methods for Operation on the Saturation Edge  

Ahn, Gwang Noh (Department of Chemical Engineering, Kyungpook National University)
Lim, Sanghun (Department of Chemical Engineering, Kyungpook National University)
Sung, Su Whan (Department of Chemical Engineering, Kyungpook National University)
Lee, Jietae (Department of Chemical Engineering, Kyungpook National University)
Publication Information
Korean Chemical Engineering Research / v.58, no.3, 2020 , pp. 390-395 More about this Journal
Abstract
For some processes with saturations, economical operating points are on the saturation edges. Traditional feedback controllers cannot be used to regulate such processes on the saturation edges because there are abrupt dynamics changes and no feedback information at saturations. Optimization-based methods such as the model predictive control can treat this control problem without difficulty when the saturation levels and dynamics are known and not varying. Otherwise, an adaptation scheme to track the saturation levels and dynamics should be included. Here, for very simple methods to treat this control problem, two control methods based on the recent slope seeking method and the relay feedback method are proposed. Their performances are evaluated with simulations applying them to a second order liquid level system with saturation. Simulations show that these proposed control methods can find and maintain operating point of the saturation edge under 5% relative error.
Keywords
Control on the Saturation Edge; Extremum Seeking Control; Relay Feedback Control; Vaporization; Chemical Reaction;
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