Using standard forms for controller design

Atherton, D.P.; Boz, Ali Fuat

doi:10.1049/cp:19980377

Cited by 33 publications

(18 citation statements)

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“…Using IMC principles for the inner loop simplifies the design procedure. Using a PI-PD structure, which is proved to give better closed loop performances for process transfer functions with unstable poles or an integrator [11]- [13], and large time constants or complex poles [14], improves the performance of the closed loop. The outer loop PI-PD controllers' parameters are identified by the use of standard forms, which is a simple algebraic approach to controller design.…”

Section: Fig 1: Cascade Control Systemmentioning

confidence: 99%

“…Results with a single zero were also given so that the feedback loop would follow a ramp input with zero steady-state error but these expressions are not appropriate for step response design. For a closed loop transfer function with one zero it is easy to present results for these optimum transfer functions as the position of the zero varies and this is done in reference [11].…”

Section: Standard Formsmentioning

confidence: 99%

See 1 more Smart Citation

Improved cascade control structure for enhanced performance

Kaya¹,

Tan²,

Atherton³

2007

Journal of Process Control

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Abstract:In conventional single feedback control, the corrective action for disturbances does not begin until the controlled variable deviates from the set point. In this case, a cascade control strategy can be used to improve the performance of a control system particularly in the presence of disturbances. In this paper, an improved cascade control structure and controller design based on Standard forms, which was initially given by authors, is suggested to improve the performance of cascade control. Examples are given to illustrate the use of the proposed method and its superiority over some existing design methods.

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Section: Fig 1: Cascade Control Systemmentioning

confidence: 99%

Section: Standard Formsmentioning

confidence: 99%

Improved cascade control structure for enhanced performance

Kaya¹,

Tan²,

Atherton³

2007

Journal of Process Control

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“…For example 5 1 can be found from [2,4]. This means that the optimum controller parameters for low order plants may be found directly by simple algebra.…”

Section: General Integral Squared Ermr Criteriamentioning

confidence: 99%

Limitations of PID controllers

Atherton

Majhi

1999

Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251)

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The objective of the paper is to outline the limitations of classical PID controllers acting on the error signal for control of a plant modelled as a linear transfer function.It is shown how a modified form of controller, a PI-PD controller, which corresponds to PI control of a plant transfer function changed by the PD feedback can produce improved control in several situations. This implementation avoids the derivative kick problem associated with derivative action in the forward path, which still exists when a filter is included. Further, the PD in the inner feedback loop enables placement of the open loop poles in appropriate positions thereby providing good control for open loop system transfer functions having resonances, unstable, or integrating poles. The simulation results show significantly improved performance of the proposed control method particularly for the latter processes.

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“…with K and b positive to model an integrating process with no dead-time, and G(s) = Ke-="/s (6) with K positive to model an integrating process with dead-time.…”

Section: Consider the Following Transfer Functionsmentioning

confidence: 99%

A PI-PD controller design for integrating processes

Kaya

Atherton²

1999

Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251)

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A model-based PI-PD controller design, which enables a tighter control for integrating processes because of more tuning parameters, is proposed. Several procedures for obtaining the parameters of the PI-PD controller are possible but one of the simplest approaches, which is used in this paper, is to employ ISTE standard forms as this enables the design to be completed using simple algebra. Also, an exact method for model extraction of some integrating processes which may or may not have a time delay is presented. The method is compared with several existing methods to control integrating processes and it is shown that the proposed method is superior to existing ones.

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Using standard forms for controller design

Cited by 33 publications

References 0 publications

Improved cascade control structure for enhanced performance

Improved cascade control structure for enhanced performance

Limitations of PID controllers

A PI-PD controller design for integrating processes

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