On the robust tuning of controllers with recycle compensators

Armbrust, Nina; Sbárbaro, Daniel

doi:10.3182/20100915-3-it-2017.00036

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…In order to retain the steady-state advantage of recycle and avoid its dynamic penalty, Taiwo − proposed the idea of using the recycle compensator in the control of plants with recycle. Its effectiveness has been widely supported by other researchers. − Its industrial applicability has also been reported by Lakshminarayanan and Takada …”

Section: Introductionmentioning

confidence: 63%

Recycle Compensator Facilitates Rapid Parameterization of Proportional Integral/Derivative (PI/D) Controllers for Open-Loop Unstable Recycle Processes

Bamimore

Taiwo

2015

Ind. Eng. Chem. Res.

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Processes with recycle are quite common in the process industries. It has been pointed out that such processes often exhibit unusual dynamics, such as open-loop instability, which makes the task of designing a model-based controller for them challenging. In this work, a design procedure for rapid parametrization of simple internal model control (IMC)-based proportional integral/derivative (PI/D) controller for open-loop unstable recycle processes is proposed. In the proposed strategy, first, the recycle process model is decomposed into the forward and recycle path. Thereafter, a perfect/approximate compensator is designed for the global process. The final controllers for the global process are then parametrized using the compensated system model and implemented on the system. It was observed that the compensator was able to restore stability to the open-loop unstable recycle process model and simplifies its model order considerably. Simulation results obtained revealed that the recycle compensated system displays better closed-loop performance, in terms of set-point tracking and disturbance rejection. Furthermore, the proposed method results in a closed-loop system that is less sensitive to disturbance and has a smoother control signal with higher gain and phase margins.

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Section: Introductionmentioning

confidence: 63%

Recycle Compensator Facilitates Rapid Parameterization of Proportional Integral/Derivative (PI/D) Controllers for Open-Loop Unstable Recycle Processes

Bamimore

Taiwo

2015

Ind. Eng. Chem. Res.

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“…Recycles enable efficient energy usage and increase the recovery of fuels. [3,4] Alternatively, because recycles cause modifications in dynamic behaviour concerning a plant arranged in cascades, [5,6] the actual operation of plants becomes complex. Conventional control systems cannot handle the dynamic characteristics induced by recycles, [7,8] especially making the plants more sensitive to low-frequency disturbances.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional control systems cannot handle the dynamic characteristics induced by recycles, [7,8] especially making the plants more sensitive to low-frequency disturbances. [3,9] Furthermore, it is crucial to consider the challenge of maintaining process feasibility. While processes are typically proposed to be viable over a wide range of operating conditions, in reality, they only exist within a narrow set of conditions.…”

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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“…One of the famous techniques to tune controller parameters is the usage of compensators. Recycle compensator is one of the famous techniques to tune the controller parameters (Armbrust and Sbarbaro 2010). Minimization of RO plant energy consumption using optimal-based control (Bartman et al 2010) along with alternative energy sources (Chaabene and Sellami 2013) for RO plants also has been introduced by different researchers.…”

Section: Introductionmentioning

confidence: 99%

Design and development of reverse osmosis (RO) plant status monitoring system for early fault prediction and predictive maintenance

et al. 2018

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Automation and reliability are the crucial elements of any advance reverse osmosis plant to meet the environmental and economic demands. Early fault indication, diagnosis and regular maintenance are the key challenges with most of the reverse osmosis plants in the Indian scenario. The present work introduces a modern reverse osmosis (RO) plant status monitoring unit to monitor different plant parameters in real time and early prediction for faults and maintenance. Developed RO plant status monitoring unit consists of a touch screen-based embedded monitoring unit, water quality sensors (pH, TDS), sampling chamber for controlled water flow, flow sensors, pressure and level sensors. The present system has been developed in a modular fashion so that it could be integrated with any capacity of RO plant units. Developed embedded system monitors various parameters of the plant such as input power, efficiency of the plant, level of input and output water tank and also guides operator with instructions for plant operation. Other than this, a dedicated smartphone app interface has been developed for the operator to acquire data from status monitoring unit, storage on smartphone, and transfer it to the cloud. The developed smartphone-based app also provides facility to integrate plant data with Google map with location information for easy understanding and quick action. The system has also a backup facility to transfer data to the server using 2G GSM module during the unavailability of the operator. A dedicated centralized Web server has been developed for real-time visualization of all installed RO plant status monitoring units. Different machine learning techniques have been implemented on acquired sensors data to predict early warnings related to power failure, membrane fouling and scaling, input water shortage, pipe, tank leakage, water quality sensors damage, non-operation or wrong operation of the plant along with different maintenance actions such as membrane water and chemical wash. Developed RO status monitoring unit has been tested with various RO plants having capacity from 500 LPH to 2000 LPH and deployed at various nearby villages of Rajasthan.

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On the robust tuning of controllers with recycle compensators

Cited by 5 publications

References 18 publications

Recycle Compensator Facilitates Rapid Parameterization of Proportional Integral/Derivative (PI/D) Controllers for Open-Loop Unstable Recycle Processes

Recycle Compensator Facilitates Rapid Parameterization of Proportional Integral/Derivative (PI/D) Controllers for Open-Loop Unstable Recycle Processes

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

Design and development of reverse osmosis (RO) plant status monitoring system for early fault prediction and predictive maintenance

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