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Research Papers

Design of Reset Control Systems: The PI + CI Compensator

[+] Author and Article Information
Alfonso Baños

 Department Informática y Sistemas, University of Murcia, Murcia 30100, Spainabanos@um.es

Angel Vidal

 Department Informática y Sistemas, University of Murcia, Murcia 30100, Spainavidal@um.es

J. Dyn. Sys., Meas., Control 134(5), 051003 (Jun 05, 2012) (11 pages) doi:10.1115/1.4004773 History: Received September 08, 2010; Revised May 30, 2011; Published June 05, 2012; Online June 05, 2012

Reset compensation has been used to overcome limitations of linear and time invariant (LTI) compensation. In this work, a new reset compensator, referred to as proportional and integral (PI) + CI (Clegg integrator), is introduced. It basically consists of adding a Clegg integrator to a PI compensator, with the goal of improving the closed loop response by using the nonlinear characteristic of this element. It turns out that by resetting a percentage of the integral term in a PI compensator, a significant improvement can be obtained over a well-tuned PI compensator in some relevant practical cases, such as systems with dominant lag and integrating systems. The work is devoted to the development of PI + CI tuning rules for basic dynamic systems in a wide range of applications, including first and higher order plus dead time systems.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 9

System responses and control signals for PI and PI + CI-controllers

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Figure 8

System responses and control signals for PI−IMC, PI−SIMC and PI + CI−SIMC controllers

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Figure 7

System responses and control signals for PI−IMC, PI-des and PI + CI−des controllers

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Figure 6

System responses and control signals for PI−IMC and PI + CI−IMC controllers

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Figure 5

System responses and control signals for PI – IMC, PI – SIMC and PI + CI – SIMC controllers

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Figure 4

System responses and control signals for PI and PI + CI controllers

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Figure 3

PI+CI describing function for several values of preset (kp = τi = 1)

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Figure 2

PI + CI controller structure

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Figure 1

Reset compensator C applied to a LTI plant P

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