A unified approach to controller saturation

Hui, Keung; 許強,

doi:10.5353/th_b4257447

Cited by 4 publications

(6 citation statements)

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“…Nevertheless, satisfactory results from their applications provide the required validations. Other designs are investigated elsewhere (Hui andChan 1998, 1999).…”

Section: Frequency Domain Designs Of Saturation Compensatorsmentioning

confidence: 99%

“…Since there is now one± one correspondence between the controller-compensato r and the 3DoF controller, equivalence is completely established for single saturation systems. In spite of its original intention to treat plant uncertainties, the control synthesis work of Horowitz (1983) can now be acknowledged as containing the general compensation framework for SISO systems subject to single saturation non-linearity (Hui 1995).…”

Section: Single Saturation Systemsmentioning

confidence: 99%

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Design of rate and amplitude saturation compensators using three degrees of freedom controllers

Hui¹

2001

International Journal of Control

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This paper proposes two frequency-domain design techniques for rate and amplitude saturation compensators formulated as three degrees of freedom controllers. For single constraint systems, it shows an equivalence between the a posteriori compensator design and the a priori controller synthesis proposed by Horowitz. For rate and amplitude constrained systems, the three degrees of freedom controller is a special case of the general saturation compensator. Through multivariable frequency domain analysis of the compensators, hidden properties of the three degrees of freedom controller are revealed. These inherent properties are utilized in compensator designs by techniques shaping the characteristic loci and speci® cation of singular values. Simulated examples illustrate the success of the design methods.

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“…Nevertheless, satisfactory results from their applications provide the required validations. Other designs are investigated elsewhere (Hui andChan 1998, 1999).…”

Section: Frequency Domain Designs Of Saturation Compensatorsmentioning

confidence: 99%

Section: Single Saturation Systemsmentioning

confidence: 99%

Design of rate and amplitude saturation compensators using three degrees of freedom controllers

Hui¹

2001

International Journal of Control

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“…Item 2. Control output is rate constrained (17) and plagued by derivative saturation, giving rise to adverse effects reminiscent of non-minimum phase and time-delay systems. Item 3.…”

Section: Remarksmentioning

confidence: 99%

“…The first one is to set fk, rg in fF 4 , F 5 g. The other two are for general compensators. The design principle is based on phase angle specifications (17). If the system response using the conditioning technique (F 2 ) is not satisfactory, this would be reflected in a small phase margin of the G H (jù) plot.…”

Section: Designs Of Fixed-structure Compensatorsmentioning

confidence: 99%

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New design methods of actuator saturation compensators for proportional, integral and derivative controllers

Hui

Chan

1997

Proceedings of the Institution of Mechanical Engineers, Part I:

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This paper proposes five new schemes of saturation compensator designs for PID (proportional, integral and derivative) controllers. Unlike previous works, these are derived using frequency domain techniques. Based on stability analysis of the compensated systems, comparisons of stabilities of the compensation schemes relative to each other are established, with the result that their relative orders depend only on the PI=PID parameters. A new class of variable-structure compensators is also proposed. These variable-structure compensators combine the advantages of their individual constituents to achieve better results. Design procedures, for both fixed-and variable-structure compensators, are then presented as the main theme of this paper. Results for the relative stabilities and design procedures are illustrated with examples, showing the validity and superiority of the proposed methods.

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