Process identifier and its application to industrial control

Crowe, J.; Johnson, Michael

doi:10.1049/ip-cta:20000131

Cited by 18 publications

(11 citation statements)

References 9 publications

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“…Modified relay feedback methods using a two-level signal, a saturation-relay or a preload relay have been proposed to increase the accuracy of the identified frequency data set, by reducing the high order harmonic terms of the relay output [4][5][6]. Also, a modified relay-based technique and a phase-locked loop identifier using sinusoidal signals have been proposed to remove the harmonics completely [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Enhanced frequency response estimator to guarantee pre-specified phase angle and static disturbance rejection with all harmonics removed

Sung

Lee

2008

Korean J. Chem. Eng.

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We propose a new frequency response estimation method in order to guarantee a pre-specified phase angle of the estimated model under static disturbance circumstances with rejecting harmonics completely. The proposed method uses one cycle of the conventional relay feedback signal followed by a sinusoidal signal. The sinusoidal signal in a cyclic steady state has no harmonics, resulting in exact frequency response estimates. Also, it guarantees the pre-specified phase angle and removes the effects of static disturbances by adjusting the reference value of the sinusoidal signal.

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Section: Introductionmentioning

confidence: 99%

Enhanced frequency response estimator to guarantee pre-specified phase angle and static disturbance rejection with all harmonics removed

Sung

Lee

2008

Korean J. Chem. Eng.

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“…The PLL estimator from (Mataušek & Šekara, 2011;Šekara & Mataušek 2011c) is a further development of the idea firstly proposed in (Crowe & Johnson, 2000) and used in (Clarke & Park, 2003). The SheMa estimator is a further development of the estimator proposed by Aström and Hägglund (1984) as an improvement of the Ziegler-Nichols experiment.…”

Section: Closed-loop Estimation Of Model Parametersmentioning

confidence: 99%

PID Controller Tuning Based on the Classification of Stable, Integrating and Unstable Processes in a Parameter Plane

Šekara¹,

Mataušek²

2012

Frontiers in Advanced Control Systems

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“…Then, methods of the critical experiment based on the PLL (Phase Locked Loop) principle for process characterization have been developed [11,12], etc. In accordance with these techniques for estimation of model parameters uu ,, k  and A and controller design (control adaptation), certain modifications of the relay experiment and PLLs have been developed [15][16][17][18][19][20][21][22][23][24].…”

Section: The Application Of Relay Techniques and Phase-locked Loomentioning

confidence: 99%

“…method of the critical experiment suggested by ZN, is still actual and inspiring for process dynamics estimation regardless if it is performed in the time or in the frequency domain. These two directions in the process characterization through critical experiment under certain conditions imply analysis of the process response in the time domain (the first direction) and in the frequency domain (the second direction) for assumed form of the transfer function of the process model [3][4][5][6][7][8][9][10][11][12][13][14]. Many of developed methods are referred to uncontrolled process (open-loop system), so their application is limited.…”

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confidence: 99%

Modern methods of design, analysis, optimization and implementation of conventional control algorithms for processes with finite and infinite degrees of freedom

Šekara

2017

IJEEC

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-This paper presents characterization methods for a large class of industrial processes using a critical experiment as well as modern methods of design, analysis, optimization and implementation of conventional control algorithms. Special attention is set to the process characterization methods using relay techniques and phase-locked loops in order to form a general process model which serves as a base for adequate controller design. This general process model adequately approximates processes which behaviour can be described with linear mathematical models with finite and infinite degrees of freedom including conventional finite dimension systems, time-delay systems, systems whose behaviour is dominated by a wave and transport problems such as mass and energy transfer, systems described with fractional differential equations etc. Based on characterization, an important accent is also put on the design of PI/PID controller due to their large application in industry which exceeds 93% compared to all the other controllers according to Honeywell's surveys. In order to illustrate validity of characterization model and effectiveness of presented design method, the paper provides an example of optimal PID controller designed under constraints on robustness and sensitivity to the measurement noise. Digital implementation is considered for both the controllers with rational and those with non-rational transfer functions. At the end, controller analytical design methods are elaborated and analytical formulae for PI/PID controllers tuning are presented.

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Process identifier and its application to industrial control

Cited by 18 publications

References 9 publications

Enhanced frequency response estimator to guarantee pre-specified phase angle and static disturbance rejection with all harmonics removed

Enhanced frequency response estimator to guarantee pre-specified phase angle and static disturbance rejection with all harmonics removed

PID Controller Tuning Based on the Classification of Stable, Integrating and Unstable Processes in a Parameter Plane

Modern methods of design, analysis, optimization and implementation of conventional control algorithms for processes with finite and infinite degrees of freedom

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