Avaliação de controles PID adaptativos para um sistema de aquecimento resistivo de água

Berto, Maria Isabel; Sá, Fabiana Rodrigues de; Silveira, Vivaldo

doi:10.1590/s0101-20612004000300030

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Two controllers were previously configured to keep the set point of the hot water temperature in the heat system (Berto and Silveira Junior 2004). The first one maintains the tank's hot water temperature (TE601) within a ±2C variation, switching to on/off the status of an electrical resistance (RET601) placed in the water tank.…”

Section: Methodsmentioning

confidence: 99%

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Design and Performance of Conventional and Fuzzy Controls for a High Temperature Short Time Pasteurization System

Berto¹,

Silveira

2011

J Food Process Engineering

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Fuzzy control was applied in a high-temperature short time (HTST) pasteurization system and experimentally evaluated and compared with proportional-integralderivative (PID)/feedback and PID/feedback/feedforward controllers. The product, a juice model solution, was pasteurized for 91C/40 s in a three-stage plate heat exchange (regeneration, heating and cooling sections). Hot water and propylene glycol were responsible to heat and cool the product, respectively. A control system was designed to assure the pasteurization temperature manipulating the hot fluid flow rate. Controllers were evaluated by means of dynamic behavior of the pasteurization temperature and performance criteria after the imposed step changes of the product inlet temperature. Configured controllers kept the process temperature within HTST requirements, having a variation of Ϯ0,5C, and the similar values of performance criteria indicate an efficiency for all three tested controllers. PRACTICAL APPLICATIONSThe continuous need for better food products, standardized within the consumer demands, has expanded the applications and the search for solutions using automation and control techniques. The use of control strategies and automation in chemical, petroleum and other industrial processes are more intensive as compared with the same applications in food industries. The complex execution of experimental tests in lab-scale or pilot plants is the main reason for the great number of simulations in the process control area. Based on the importance of accomplishing experimental errors and uncertainties, this paper results from an extensive research developed in a pilot plant of HTST process. Theoretical methods for tuning controllers were applied and evaluated. Conventional controllers (PID/feedback and PID/ feedback/feedforward) were tuned and compared with fuzzy control, one of the most recognized nonconventional controllers. Results showed that the requirements to maintain pasteurization temperature after changes in inlet process conditions were performed in all three strategies, indicating the accomplishment of the research purpose.cessing. It is used to sterilize a wide range of liquid foods, including milk, fruit juices and concentrates, cream, yogurt, salad dressing, egg and ice cream mixes (Fellows 2000). Orange juice pasteurization studies have been demonstrated that lower temperatures are sufficient to inactivate microorganism activities, although, to prevent the loss of cloudiness, bs_bs_banner Journal of Food Process Engineering ISSN 1745-4530 58 Journal of Food Process Engineering 36 (2013) 58-65

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Section: Methodsmentioning

confidence: 99%

“…In the heat section, an oscillation of ±95 L/h brought about to the set point of the hot water flow rate (483 L/h) for a period of 30 s. During these tests, a PID controller kept the changes in the inlet hot water temperature within the change of ±0.5C (Berto and Silveira Junior 2004).…”

mentioning

confidence: 99%

Design and Performance of Conventional and Fuzzy Controls for a High Temperature Short Time Pasteurization System

Berto¹,

Silveira

2011

J Food Process Engineering

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“…The behavior bias of the process variables in heat exchangers under step perturbation of a manipulated variable is to track an S-shaped curve, as shown in [3], as the reaction curve of a high temperature short time (HTST) pasteurization in plate heat exchanger was obtained, and in [4], as the reaction curves of the cooling of a Newtonian fluid in a double pipe heat exchanger were studied. In the study of dynamic characteristics of a double-pipe heat exchanger, presented in [5], the transient response of the system tracked an S-shaped curve after a dead-time component.…”

Section: Introductionmentioning

confidence: 99%

Variation of Transfer Function for Dynamic Behavior of a Vegetable Oil Refrigeration Unit

Oliveira¹,

Gonçalves²,

Brittes³

et al. 2016

Modelling, Simulation and Identification / 841: Intelligent Systems and Control

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The knowledge of the dynamic behavior of a process variable is essential for characterizing the process and defining the control logic configuration to be implemented in automated plants. This work aims to characterize the dynamic behavior of a cooling process of vegetable oil under different perturbation, starting from the same initial steady state conditions. The experimental unit is consists of two sectors: 1) modular heating and 2) cooling of the vegetable oil. In the second section there are three cooling modules: 2a) set of serial finned heat exchangers with forced-air; 2b) nebulization system and 2c) plate heat exchanger with chilled water as cold fluid. Both heat exchangers showed a good adjustment to a linear second-order function for each perturbation applied. The processes, however, showed low level nonlinear behavior. In regard to these nonlinearities, the process curves were adjusted to a nonlinear second-order function with parametersproportional gain, perturbation intensity and time constantvarying with the manipulated variable. It was verified that the proposed model is suitable for the process in the considered operating range of the manipulated variable.

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“…Donadon (1998) analisou alguns métodos recursivos de estimação de parâmetros da família dos mínimos quadráticos aplicados ao controle adaptativo auto-ajustável. A implementação de um controle convencional PID para obter um ajuste fino na temperatura de entrada da água de aquecimento em um processo de pasteurização foi proposto por Berto (2004).…”

Section: Controle Adaptativounclassified

Desenvolvimento, implementação e avaliação de desempenho de um controlador adaptativo do tipo self-tuning regulator aplicado a um processo FCC

Ribeiro¹,

Filho²

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This work had as main objective the development and implementation of an selftuning regulator (STR) adaptive controller, with subsequent comparison of its performance with a PID (proportional-integral-derivative) controller and two predictive controllers, namely a predictive based on artificial neural networks (MPC-ANN) and a dynamic matrix controller (DMC). These control schemes were all implemented in the developed simulation tool, the FCCGUI -Fluid Catalytic Cracking Graphical User Interface. An artificial neural network, used as a model to estimate controller parameters, was trained and validated. This black box model provided an efficient approach for identification and nonlinear control of the catalytic cracking process. To implement the adaptive controller, three new PID control loops were structured based on statistical studies designed to analyze the effects of process variables and their interactions. The implementation of adaptive control was chosen to be in the manipulated-controlled pair C TCV -SEVER (regenerated catalyst valve opening -reaction severity). After restructuring and improvements in the simulator FCCGUI, several simulations were performed for graphical and numerical evaluation of controller performance through ITAE (Integral of Time and Absolute Error) dynamic performance criterion. The adaptive controller presented good results for both tests: servo and regulatory, in comparison with PID strategy without adaptation and other strategies available to the simulator, MPC-ANN and DMC. The ability to adjust the parameters of the controller makes it a promising strategy for systems that suffer from continuous changes in their process variables or setpoints.

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Avaliação de controles PID adaptativos para um sistema de aquecimento resistivo de água

Cited by 3 publications

References 6 publications

Design and Performance of Conventional and Fuzzy Controls for a High Temperature Short Time Pasteurization System

Design and Performance of Conventional and Fuzzy Controls for a High Temperature Short Time Pasteurization System

Variation of Transfer Function for Dynamic Behavior of a Vegetable Oil Refrigeration Unit

Desenvolvimento, implementação e avaliação de desempenho de um controlador adaptativo do tipo self-tuning regulator aplicado a um processo FCC

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