A simple method of tuning PID controllers for stable and unstable FOPTD systems

Sree, R. Padma; Srinivas, M. N.; Chidambaram, M.

doi:10.1016/j.compchemeng.2004.04.004

Cited by 126 publications

(37 citation statements)

References 11 publications

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“…We limit this comparison to tuning rules only here. PID controller with present tuning rule is compared with other available tuning rules (Lee et al, 2000;Padmasree et al, 2004;Chen et al, 2008) for the open loop unstable system, Example 1 and another first order unstable process. For comparison purpose, we consider same values of to calculate PID parameters with respective PID control strategies.…”

Section: Processmentioning

confidence: 98%

Synthesis of PID controller for unstable and integrating processes

Panda¹

2009

Chemical Engineering Science

141

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Section: Processmentioning

confidence: 98%

Synthesis of PID controller for unstable and integrating processes

Panda¹

2009

Chemical Engineering Science

141

View full text Add to dashboard Cite

“…the other controllers. Thus under perfect parameter conditions, the Proposed method [1] gives best performance compared to that of IMC(Wang/Hang) [5] and Huang-Chen [2] methods. Though Visioli [3] method gives a large overshoot, it gives better performance for ISE, and IAE values.…”

Section: A) Pid Controller For Un-stable Systemmentioning

confidence: 99%

“…For an Uncertainty of +0.2 in the process gain (Kp), Visioli [3] method could not stabilise the system. Proposed method [1] leads to better disturbance rejection. [5].The Simulation results results presented above validate the theorotical results.…”

Section: A) Pid Controller For Un-stable Systemmentioning

confidence: 99%

“…In the present section, a PID controller is designed for Unstable FOPTD system using two tuning parameters (i.e α 1 and β ).Let us consider a FOPTD system, G(s) = Kp * e − .s τs−1 (1) with '+' sign for stable systems and '-' sign for unstable systems. Let us consider a PID controller.…”

Section: A) Pid Controller For Un-stable Systemmentioning

confidence: 99%

“…The design of PID controllers for unstable FOPTD model has attracted attention recently. R.Padma Sree and M.Chidambaram [1] had proposed a simple method based on matching the coefficients of the powers of 's' in the numerator and the denominator of the closed loop transfer function for Stable and Unstable systems. In present paper, using MATLAB/Simulink simulation is performed for varying levels of uncertainties in the process model parameters of a FOPTD plant, in order to determine the stability ranges.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design, Tuning and Analysis of a Robust PID Controller for FOPTD Unstable Systems with Uncertainty in the Process Model Parameters

Patil¹,

Maghade²

2015

International Journal of Innovative Research in Electrical, Ele

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Abstract:In this paper, extensive simulations are performed on the FOPTD Unstable systems having uncertain process model parameters (i.e process gain (Kp), time constant ( τ ) and dead time (t d ), in order to design a robust PI/PID controller with better disturbance rejection and servo response, without compromising the robust performance (Robust stability) of the system. A simple PI/PID controller design and tuning method is described and compared from the point of view of the control system robustness for the First order plus time delay (FOPTD) process. For FOPTD Un-stable systems, the step responses obtained by the proposed method when uncertainty in the process model parameters exist, are compared to the responses obtained by Visioli

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Simple model reduction technique for transfer function models

Goud

Rao

Chidambaram

2021

Asia-Pacific J Chem Eng

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In this work, a novel model reduction method is proposed for transfer function models. The method is based on equating the ratio of the coefficients of the ‘s’, powers of ‘s’ in the numerator to the corresponding coefficients of the s, powers of ‘s’ in the denominator of the closed‐loop transfer function of the higher order process to the closed‐loop transfer function of the reduced order model with PI controlling settings. Using this method, a stable higher order process is reduced to a first‐order plus time delay (FOPTD) model. The step response of the closed loop of the reduced order model is compared with the corresponding higher order process. The efficiency of the proposed method is shown for several examples and for the experimental temperature control process. By the proposed reduction method for higher order processes without zero, the reduced model time constant is simply written with the addition of the all time constants of the higher order process.

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A simple method of tuning PID controllers for stable and unstable FOPTD systems

Cited by 126 publications

References 11 publications

Synthesis of PID controller for unstable and integrating processes

Synthesis of PID controller for unstable and integrating processes

Design, Tuning and Analysis of a Robust PID Controller for FOPTD Unstable Systems with Uncertainty in the Process Model Parameters

Simple model reduction technique for transfer function models

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