An analytic expression for closed-loop output behavior under multiloop PID control

Ko, Byung Su; Edgar, Thomas F.; Lee, Jietae

doi:10.1007/bf02705373

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…It is apparent from literature that the single input single output (SISO) PID controller design is valuable for real process plant. The multiloop PID controller is also commonly [19][20][21] used in the multiple input multiple output process.…”

Section: July 2008mentioning

confidence: 99%

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PID controller design for integrating processes with time delay

Shamsuzzoha

Lee

2008

Korean J. Chem. Eng.

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A simple IMC-PID controller design technique is proposed on the basis of the IMC principle for two representative integrating processes with time delay. Further, it is extended to integrating processes with negative and positive zero as well. The proposed PID controller design method is mainly focused on the disturbance rejection, which causes the overshoot in the setpoint response, and a two-degree-of-freedom (2DOF) control structure is used to eliminate this overshoot. The simulation results show the superiority of the proposed tuning rule over other existing methods, when the controller is tuned to have the same robustness level by evaluating the peak of the maximum sensitivity (Ms). The closed loop time constant (λ) has only one user-defined tuning parameter in the proposed method. A guideline is suggested for the selection of λ for different robustness levels by evaluating the value of Ms over a wide range of θ/τ ratios.

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Section: July 2008mentioning

confidence: 99%

“…The following IMC filter is utilized (20) The resulting IMC controller becomes (21) Therefore, the ideal feedback controller is obtained as…”

Section: First Order Delay Integrating Process (Fodip)mentioning

confidence: 99%

PID controller design for integrating processes with time delay

Shamsuzzoha

Lee

2008

Korean J. Chem. Eng.

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“…The former technique was originally developed by Harris based on the minimum variance control (MVC). Following Harris' MVC approach, other monitoring control systems, such as feedforward/feedback systems, internal model control (IMC) control, multi-input/multioutput (MIMO) feedback systems, cascade control systems , and multiloop proportional−integral−derivative (PID) control systems, have also been proven useful in prioritizing the activities of process engineers. This can potentially benefit from assessing the controller performance of the current operating system.…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of Cascade Control Loop Status Using Performance Analysis Based Approach

Yea

Chen

2006

Ind. Eng. Chem. Res.

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On the basis of the achievable performance of the control outputs, fault diagnosis of two cascade control systems, including series cascade control (SCC) and parallel cascade control (PCC), is developed. Without any prior knowledge of complicated operating processes and/or external inputs perturbing the operating system, the accurate fault identification can be achieved by a series of the statistical hypothesis procedures applied to the currently measured data. To isolate possible faults, the output variances of the primary and secondary loops are separated into cascade-invariant (CI) and cascade-dependent (CD) terms, respectively, by the Diophantine decompositions. After a sequence of the hypotheses tests is performed on the CI and the CD terms of current control and the achievable performance conditions, the hierarchical diagnosis trees for the primary and secondary outputs are established, respectively, to explore possible faults. The final faults can be inferred by merging both diagnosis trees. The statistical inference systems for SCC and PCC structures are the same. The performance of the proposed method is demonstrated via two examples, including a simulation case with a single fault and a pilot-level tank system with multiple faults.

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Heat transfer characteristics of the fluidized bed through the annulus

Shedid

Hassan

2015

Heat Mass Transfer

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An analytic expression for closed-loop output behavior under multiloop PID control

Cited by 5 publications

References 11 publications

PID controller design for integrating processes with time delay

PID controller design for integrating processes with time delay

Diagnosis of Cascade Control Loop Status Using Performance Analysis Based Approach

Heat transfer characteristics of the fluidized bed through the annulus

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