Simplified dead-time compensator for multiple delay SISO systems

Torrico, Bismark C.; Correia, Wilkley Bezerra; Nogueira, Fabrício G.

doi:10.1016/j.isatra.2015.10.018

Cited by 24 publications

(4 citation statements)

References 16 publications

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“…No entanto, este DTC pode ser utilizado apenas para modelos de primeira ordem com atraso. Para resolver esta limitação, foi proposto o Compensador de Atraso de Transporte Simplificado (SDTC, do inglês Simplified Dead-Time Compensator ) (Torrico et al, 2016), possuindo uma estrutura equivalente ao SFSP para modelos de primeira ordem, no entanto, podendo ser utilizado para modelos de ordem superior.…”

Section: Uma Das Mais Relevantes Estruturas Derivadas Do Sp O Preditunclassified

Porque Não Deveríamos Esquecer o Preditor de Smith

Machado

Pereira

Torrico

et al. 2019

Anais Do 14º Simpósio Brasileiro De Automação Inteligente

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Recently, the use of the Smith Predictor was questioned due to issues related to its robustness to process dead-time uncertainties. Thus, this work presents a comparison between a structure derived from Smith Predictor, called Simplified Dead-Time Compensator (SDTC), and PI/PID controllers in terms of performance and robustness. The main results of this comparison show that the SDTC is better or similar than PI/PID controllers in terms of performance and that robustness to dead-time uncertainties can be better quantified in terms of multiplicative uncertainties and robustness index curves. Resumo: Recentemente, o uso do Preditor de Smith foi questionado devido a problemas relacionadasà sua robustezà incertezas no atraso de transporte do processo. Assim, este trabalho apresenta uma comparação entre uma estrutura derivada do Preditor de Smith, denominada Compensador de Atraso de Transporte Simplificado (SDTC), e controladores PI/PID em termos de desempenho e robustez. Os principais resultados desta comparação mostram que o SDTĆ e melhor ou similar aos controladores PI/PID em desempenho e que a robustez quantoà incertezas no atraso de transporte pode ser melhor quantificada em termos de curvas de incerteza multiplicativa e deíndice de robustez.

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Section: Uma Das Mais Relevantes Estruturas Derivadas Do Sp O Preditunclassified

Porque Não Deveríamos Esquecer o Preditor de Smith

Machado

Pereira

Torrico

et al. 2019

Anais Do 14º Simpósio Brasileiro De Automação Inteligente

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“…The works [31,32,34] proposed simplified versions of the FSP, with lower-order controllers compared to the traditional version and equivalent or better robustness and disturbance rejection response.…”

Section: Introductionmentioning

confidence: 99%

Tuning rules for unstable dead-time processes

Rodrigues

Sombra

Torrico

et al. 2021

European Journal of Control

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“…Therefore, its extension to integrating and unstable systems is still the goal of current research. However, in addition to the further development of FSPs [14][15][16], DTCs for unstable and integrating systems can also be designed as stabilized solutions that still provide the disturbance signal, which is important for many applications. The stabilizing controller designed correctly for an unstable plant can first yield a stable circuit with known dominant dynamics, for which we then propose a disturbance observer in the usual way [17].…”

Section: Introductionmentioning

confidence: 99%

Dead-Time Compensation for the First-Order Dead-Time Processes: Towards a Broader Overview

et al. 2021

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The article reviews the results of a number of recent papers dealing with the revision of the simplest approaches to the control of first-order time-delayed systems. The concise introductory review is extended by an analysis of two discrete-time approaches to dead-time compensation control of stable, integrating, and unstable first-order dead-time processes including simple diagnostics of the model used and focusing on the possibility of simplified but reliable plant modelling. The first approach, based on the first historically known dead-time compensator (DTC) with possible dead-beat performance, is based on the reconstruction of the actual process variables and the compensation of input disturbances by an extended state observer (ESO). Such solutions play an important role both in a disturbance observer (DOB) based control and in an active disturbance rejection control (ADRC). The second approach considered comes from the Smith predictor with two degrees of freedom, which combines feedforward control with output disturbance reconstruction and compensation by the parallel plant model. It is shown that these two approaches offer advantageous properties in the case of actuator limitations, in contrast to the commonly used PID controllers. However, when applied to integrating and unstable first-order systems, the unconstrained and possibly unobservable output disturbance signal of the second solution must be eliminated from the control loop, due to the hidden structural instability of the Smith predictor-like solutions. The modified solutions, usually referred to as filtered Smith predictor (FSP), then no longer provide a disturbance signal and thus no longer fully fit into the concept of Industry 4.0, which is focused on further optimization, predictive maintenance in dynamic systems, diagnosis, fault detection and fault identification of dynamic processes and forms the basis for the digitalization of smart production. Nevertheless, the detailed analysis of the elimination of the unstable disturbance response mode is also worth mentioning in terms of other possible solutions. The application of both approaches to the control of a thermal process shows almost equivalent quality, but with different dependencies on the tuning parameters used. It is confirmed that a more detailed identification of the controlled process and the resulting higher complexity of the control algorithms does not necessarily lead to an increase in the resulting quality of the transients, which underlines the importance of the simplified plant modelling for practice.

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Simplified dead-time compensator for multiple delay SISO systems

Cited by 24 publications

References 16 publications

Porque Não Deveríamos Esquecer o Preditor de Smith

Porque Não Deveríamos Esquecer o Preditor de Smith

Tuning rules for unstable dead-time processes

Dead-Time Compensation for the First-Order Dead-Time Processes: Towards a Broader Overview

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