Analysis and Synthesis of Discrete-Time Repetitive Controllers

Tomizuka, Masayoshi; Tsao, Tsu‐Chin; Chew, Kok-Kia

doi:10.1115/1.3153060

Cited by 537 publications

(265 citation statements)

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“…Do ponto de vista de controle, a capacidade de rastreamento de referência e de rejeição de distúrbios, que são inerentes nestas aplicações, são requisitos imprescindíveis. Por estes motivos, a aplicação do chamado Controlador Repetitivo (CR) (Hara et al, 1988;Tomizuka et al, 1989) têm sido considerada como uma alternativa para a compensação de erros de regime permanente na maioria destas aplicações, tais como em UPSs (Michels et al, 2004;Escobar et al, 2007;Zhou et al, 2006), fontes CA (Tzou et al, 1997) e filtros ativos de potência conectados em paralelo na rede elétrica (Grino et al, 2007;Olm, Ramos, Castello-Castelló and Cardoner, 2010). O CR está atualmente, também sendo utilizado no controle de inversores para outras aplicações, tais como em geração distribuída (Mastromauro et al, 2009), correção de fator de potência (Wu et al, 2010) e fontes CC (Escobar et al, 2005).…”

Section: Introductionunclassified

“…Adicionalmente, nestas aplicações, o comportamento da carga não-linear é similar a um distúr-bio exógeno sincronizado com o sinal de referência (Michels et al, 2004). Existem vários tipos de CRs adequados para implementação digital (Tomizuka et al, 1989;Kempf et al, 1993). Para inversores PWM, o algoritmo do tipo filtro-Q é o esquema mais utilizado ser de rápida execução e velocidade convergência e possuir código de baixa complexidade.…”

Section: Introductionunclassified

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Análise comparativa de controladores repetitivos modificados para aplicação em inversores PWM

Michels¹,

Stefanello

Gründling³

2012

Sba Controle & Automação

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Comparative Analysis of Modified Repetitive Controllers for Applications in PWM InvertersConventional repetitive controllers are not suitable for applications were reference or disturbances are periodic where its fundamental frequency is subject to variation. However, this is a situation commonly encountered in applications of pulse-width modulated inverters feeding nonlinear loads or connected to the grid. Several approaches to mitigate this problem have been proposed in the literature, but there is no studies with comparative analysis among them. This paper provides a comparative analysis of three modified repetitive controllers developed to solve this problem. The following methods are covered in the analysis: i) continuous adjustment of the sampling rate; ii) truncation of the number of samples per reference cycle to the nearest integer and iii) adjustment of a fictitious sampling rate in order to maintain constant the number of samples of the controller per reference cycle. These existing approaches are depicted in details

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Section: Introductionunclassified

Análise comparativa de controladores repetitivos modificados para aplicação em inversores PWM

Michels¹,

Stefanello

Gründling³

2012

Sba Controle & Automação

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“…Otherwise, alternative techniques should be applied in order to avoid closed-RHS plane zero-pole cancellations [22]. Moreover, there is no problem with the improperness of G x (z) because the internal model provides the repetitive controller with a high positive relative degree.…”

Section: Digital Repetitive Control Under Constant Frequencymentioning

confidence: 99%

“…• A trivial structure which is often used for G x (z) in case that G 0 (z) is minimum-phase is [22]:…”

Section: Digital Repetitive Control Under Constant Frequencymentioning

confidence: 99%

Adaptive compensation strategy for the tracking/rejection of signals with time-varying frequency in digital repetitive control systems

Olm

Ramos

Costa‐Castelló

2010

Journal of Process Control

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Digital repetitive control is a technique which allows to track periodic references and/or reject periodic disturbances. Repetitive controllers are usually designed assuming a fixed frequency for the signals to be tracked/rejected, its main drawback being a dramatic performance decay when this frequency varies. A usual approach to overcome the problem consists of an adaptive change of the sampling time according to the reference/disturbance period variation. However, this sampling period adaptation implies parametric changes affecting the closed-loop system behavior, that may compromise the system stability. This article presents a design strategy which allows to compensate for the parametric changes caused by sampling period adjustment. Stability of the digital repetitive controller working under timevarying sampling period is analyzed. Theoretical developments are illustrated with experimental results.

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“…The benefit of RC is that it does not require the same initial condition each trial. For more detail on discrete RC see [7], [16], [17].…”

Section: Office Building Temperature Controlmentioning

confidence: 99%

Learning/repetitive control for building systems with nearly periodic disturbances

Vinther

Chandan

Alleyne

2013

2013 European Control Conference (ECC)

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Abstract-In this paper, learning/repetitive control is proposed for improvement of existing feedback control loops for temperature regulation in buildings. A single zone office building is used as an example, with real weather data for Phoenix Arizona and realistic occupancy load schedules. Simulations have shown a decrease in the average set point tracking error of more than 50%, even without additional energy consumption. This can be achieved in situations where the load disturbances have enough repeatability and a repeatable-to-nonrepeatable ratio can be computed to determine if learning should be used and at which frequencies. Furthermore, the increased tightness in reference tracking could be used to lower energy consumption by moving the reference set point closer to the boundaries of the allowable temperature range.

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Analysis and Synthesis of Discrete-Time Repetitive Controllers

Cited by 537 publications

References 0 publications

Análise comparativa de controladores repetitivos modificados para aplicação em inversores PWM

Análise comparativa de controladores repetitivos modificados para aplicação em inversores PWM

Adaptive compensation strategy for the tracking/rejection of signals with time-varying frequency in digital repetitive control systems

Learning/repetitive control for building systems with nearly periodic disturbances

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