A loop shaping perspective for tuning controllers with adaptive feedforward cancellation

Byl, Marten; Ludwick, Stephen J.; Trumper, David L.

doi:10.1016/j.precisioneng.2004.04.005

Cited by 60 publications

(52 citation statements)

References 20 publications

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“…De esta manera, un controlador por realimentación de estado para la planta (1)-(2) puede ser aplicado usando la estimación obtenida por medio del observador (10): (13) Donde K p corresponde con el vector de ganancias de realimentación de estado. La ley de control logra el rechazo de la perturbación por medio del término ˆk  C z , ver (11).…”

Section: Control Basado En Un Observador Resonanteunclassified

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Discrete-Time Resonant Observer Based Control for Periodic Signal Rejection

Cortes

Ramos

Costa

2015

IEEE Latin Am. Trans.

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Abstract-Rejection of periodic signals has been a subject of great interest in control theory and engineering applications. Periodic disturbances are usually present in mechatronic, hydraulic and electronics systems, between others. This paper proposes a resonant observer-based control for periodic signal rejection. The observer includes, in an embedded way, an internal model of the disturbance that is based on its harmonic decomposition. The resulting disturbance estimation is used by a control law that cancels the periodic disturbance term while controlling a specified tracking task. The proposed scheme lets the control designer to address the disturbance estimation and tracking problems separately. Experimental results, on a mechatronic test bed, show that the proposed resonant observerbased control successfully rejects periodic disturbances.

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Section: Control Basado En Un Observador Resonanteunclassified

“…En [11] se propone un procedimiento de sintonización en el que los resonadores se ubican en el lazo de control principal. Como se muestra en esa propuesta, se asignan una ganancia y una fase a cada elemento resonador para obtener márgenes de estabilidad apropiados en un marco de diseño frecuencial.…”

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Discrete-Time Resonant Observer Based Control for Periodic Signal Rejection

Cortes

Ramos

Costa

2015

IEEE Latin Am. Trans.

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“…In order to give the maximum robustness to the system, the angles ϕ k of the continuoustime resonators must coincide with the phase of the plant at the considered frequency ω k [6], [14].…”

Section: Resonatorsmentioning

confidence: 99%

Digital AFC control of a three-phase three-wire unity-power-factor PWM rectifier

Orellana

Griñó

2013

2013 9th Asian Control Conference (ASCC)

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Nowadays, ac/dc power converters must fulfill more and more design constraints with respect to the electrical grid: harmonics reduction, operation with sags and swells and/or high grid impedances, etc. This is a challenge for the controllers, since they must be robust enough to ensure the stability of the system, specially when working the conditions are not the ideal ones. In this paper, a discrete-time control technique based on Adaptive Feed-forward Cancellation (AFC) is proposed for a three-phase three-wire rectifier with a LCL input filter. The continuous-time design method for resonators has been translated into the discrete-time domain. Thus, the controller has been entirely designed in discrete-time, avoiding approximate conversions of the controller from the continuous-time domain. Besides, the usual unit computational delay in sampled-data control systems is taken into account. The simulation results show that this kind of resonant control is not only robust, but also presents a good performance.Peer ReviewedPostprint (published version

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“…An alternative implementation of the IMP controller is modulated-demodulated control, sometimes referred to as adaptive feedforward control or adaptive feedforward cancellation [7], [8]. This approach shifts the spectrum of "high" frequency oscillations down to a baseband which includes DC, operates at the baseband, then shifts the baseband spectrum back to high frequency.…”

Section: Introductionmentioning

confidence: 99%

Dynamic phase compensation in Modulated-Demodulated Control for Pulsed jet injection

Hendrickson

M’Closkey

2011

Proceedings of the 2011 American Control Conference

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This paper proposes the addition of dynamic phase compensation to modulated-demodulated controllers used for disturbance rejection/reference tracking and demonstrates a novel application of repetitive control for pulsed jet injection. In cases where a plant has rapidly varying phase near the frequency or frequencies to be controlled, conventional static phase compensation may be inadequate due to the propensity to create peaking in the sensitivity function. Dynamic phase compensation improves the disturbance rejection characteristics of modulated-demodulated controllers by inverting the plant phase over some frequency band in the "baseband" coordinates. Both static and dynamic phase compensation controllers are compared on an experimental apparatus that is used to study pulsed jet injection. The controllers are used to track a square wave in the temporal velocity profile of a pulsed jet of air using active forcing. In this application pulsing the jet improves the mixing and spread of the jet which are useful for energy generation and aerospace applications.

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A loop shaping perspective for tuning controllers with adaptive feedforward cancellation

Cited by 60 publications

References 20 publications

Discrete-Time Resonant Observer Based Control for Periodic Signal Rejection

Discrete-Time Resonant Observer Based Control for Periodic Signal Rejection

Digital AFC control of a three-phase three-wire unity-power-factor PWM rectifier

Dynamic phase compensation in Modulated-Demodulated Control for Pulsed jet injection

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