Towards Intelligent PID Control

Åström, Karl Johan; Hang, Chang C.; Persson, Per

doi:10.1016/b978-0-08-040185-0.50014-2

Cited by 32 publications

(27 citation statements)

References 6 publications

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“…This provides a very effective tool to understand the system dynamics behavior while under perturbation. It is important to mention that the term "intelligent" already exists in the literature in the work of Aström et al, but with a different meaning [13]. Aström and coworkers gave some efficient rules for an optimal tuning of the PID's gains, which was considered as an intelligent way for the tuning.…”

Section: Introductionmentioning

confidence: 99%

Model-free approach based on intelligent PD controller for vertical motion reduction in fast ferries

Ticherfatine¹,

Zhu²

2018

Turk J Elec Eng & Comp Sci

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Abstract:A new model-free approach was investigated to control two moving flaps and a T-foil of a fast ferry traveling in the head sea. Considered as a highly perturbed system, fast ferries in sea waves suffer from the undesirable effects of pitch and heave motions causing severe vertical accelerations that lead to the discomfort of passengers who then experience seasickness. To appropriately control this multivariable system, a model-free control strategy was adopted.An augmented PD controller with compensating terms resulting from an online identification of an ultralocal model of the system was designed. Relying only on input-output data and using online numerical differentiation based on a fast estimation technique, a nonphysical model was designed and continuously updated to capture all the unknown system dynamics, uncertainties, and perturbations. The resulting controller, known as an intelligent PD (iPD) controller, has been proven to be of a reduced design complexity but able to cope with the system's changing characteristics under high perturbations. The robustness to parameter variations was analyzed and compared to a classic PD controller's performance. The results showed that good reductions in the system's vertical motions and seasickness were obtained with a low computational cost. Moreover, the iPD successfully exhibited very robust behavior based on its model-free property when changing the system parameters and the operating velocity.

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Section: Introductionmentioning

confidence: 99%

Model-free approach based on intelligent PD controller for vertical motion reduction in fast ferries

Ticherfatine¹,

Zhu²

2018

Turk J Elec Eng & Comp Sci

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“…The identification of a point of the process frequency response can be performed either using a proportional regulator, which brings the closed-loop system to the stability boundary, or by a relay forcing the process output to oscillate. Åström and Hägglund (Åström, et al, 1984;Åström, et al, 1992;Schei, 1994;Åström, et al, 1995;Leva, et al, 2002) report an important and interesting approach. Their method is based on the Ziegler-Nichols frequency domain design formula.…”

Section: Introductionmentioning

confidence: 99%

“…To simplify this task, PID controllers can incorporate auto-tuning capabilities, which may reduce dramatically the start-up period. The autotuners are equipped with a mechanism capable of automatically computing a reasonable good set of parameters when the regulator is connected to the process (Åström, et al, 1984;Åström, et al, 1992;Åström, et al, 1995;Leva, et al, 2002). Auto-tuning is a very desirable feature and almost every industrial PID controller provides it nowadays.…”

Section: Introductionmentioning

confidence: 99%

Introducing a Novel Auto-Tuner as an Educational Tool

Nașcu

Keyser

Ionescu

2006

IFAC Proceedings Volumes

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This paper presents 2 student projects regarding a recently developed extension of the widely used relay-feedback PID auto-tuner. The proposed method consists of two steps: process identification and controller design. First, a non-iterative procedure is suggested for identification of two points on the process Nyquist curve. A second-orderplus-dead-time model is obtained and then used for PID controller design based on the internal model principle (IMC). For the identification of the two points on the Nyquist curve a pure relay in the feedback loop (as used in standard auto-tuning) and a relay which operates on the integral of the error are used. The method is illustrated on two applications: a continuous stirred tank reactor and a boost DC-DC converter. These examples are relevant for the students following the basic course in control engineering. The influence of changing a design parameter -the desired closed loop behaviour -is shown. The several tuning options lead to changes in the performance, making the method a useful tool in control education.

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“…Åström and Hägglund (Åström and Hägglund, 1984;Hang et al, 1991;Åström et al, 1992) report an important and interesting approach. Their (basic) method is based on the Ziegler-Nichols frequency domain design formula (Ziegler and Nichols, 1942), but they have also described plenty of extensions.…”

Section: Introductionmentioning

confidence: 99%

The Next Generation of Relay-Based PID Autotuners (PART 1): Some Insights on the Performance of Simple Relay-Based PID Autotuners

Ionescu

Keyser

2012

IFAC Proceedings Volumes

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The paper presents theoretical insights which might lead to further development of improved relay-based PID autotuners. The analysis is based on the first generation of autotuners, namely the widely used Åström-Hägglund relay-feedback tuner. The analysis is accompanied by illustrative examples. The performance of the autotuners is evaluated against a reference PID controller which is designed using computer aided design tools and assuming full knowledge of the system's transfer function. The paper is concluded by pointing towards some ideas to design a more generally valid version of the PID autotuner.

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Towards Intelligent PID Control

Cited by 32 publications

References 6 publications

Model-free approach based on intelligent PD controller for vertical motion reduction in fast ferries

Model-free approach based on intelligent PD controller for vertical motion reduction in fast ferries

Introducing a Novel Auto-Tuner as an Educational Tool

The Next Generation of Relay-Based PID Autotuners (PART 1): Some Insights on the Performance of Simple Relay-Based PID Autotuners

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