Applications of an Optimal Multi-Objective Technique for Integrated Control Structure Selection and Tuning

Godoy, Rodrigo Juliani Correa de; Garcia, Cláudio

doi:10.1016/j.ifacol.2017.08.1185

Cited by 1 publication

(2 citation statements)

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“…In this regard, we propose the implementation of a hierarchical structure. (El Wajeh et al 2023 [21,22] ;) The main advantage of this configuration is that a regulatory task is entrusted to individual controllers, where the PID type is one whose stability has been widely demonstrated. Thus, each process unit will stay stable as long as its controllers reject disturbances of low amplitude and frequency.…”

Section: Pwc Structurementioning

confidence: 99%

“…However, when the aforementioned assumptions are not met, plantwide control strategies become necessary to control the entire process. [18][19][20][21][22][23][24] These strategies involve analyzing the global behaviour of the plant to simultaneously address the impact of local disturbances. To achieve this, a hierarchical pathway has been designed to concentrate control efforts on regulating the critical stage of the process.…”

Section: Introductionmentioning

confidence: 99%

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Plant‐wide control for processes with recycle and narrow feasible sets

Obando,

Muñoz

2023

Can J Chem Eng

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Recycling mass and energy is a feature in almost all plants and industries. It is reported as an inevitable characteristic in actual industries due to differences between the designed processes and implementation. When a process is set, engineers identify inefficiencies in the planned performance and utilize recycles to try to reduce this difference. However, although recycles help in improving a plant's overall performance compared with a serial arrangement, its effect on dynamic plant behaviour is seldom considered, and these changes begin to impact the features of processes like controllability and stability. Similarly, even though recycles affect the feasible region of individual equipment, its effect is not verified. Based on the aforementioned background, several studies have demonstrated that advanced control strategies allow for the improvement of the dynamic behaviour of complex plants. Different techniques, such as model‐based predictive control and plant‐wide control (PWC), also show that their implementation reduces the effects of recycles. However, there is no explicit methodology to design these controllers and address the impacts of recycles on dynamic behaviour and feasibility. Additionally, there is no tuning procedure to design controllers that optimize the dynamic performance of plants, including the control system. In this context, this work presents an analysis to characterize the effects of recycles on the dynamic behaviour of plants, including how they affect the feasible operating region. Based on the previous analysis, a control methodology is also proposed to design the PWC strategy, explicitly addressing the dynamical phenomena of recycles in processes.

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Section: Pwc Structurementioning

confidence: 99%