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An Enhanced Performance PID Filter Controller for First Order Time Delay Processes
Shamsuzzoha, Mohammad,Lee, Moonyong The Society of Chemical Engineers, Japan 2007 Journal of chemical engineering of Japan Vol.40 No.6
<P>An analytical tuning method for a PID controller cascaded with a lead/lag filter is proposed for FOPDT processes based on the IMC design principle. The controller is designed for the rejection of disturbances and a two-degree-of-freedom control structure is used to slacken the overshoot in the set-point response. The simulation study shows that the proposed design method provides better disturbance rejection than the conventional PID design methods when the controllers are tuned to have the same degrees of robustness. A guideline of a single tuning parameter of closed-loop time constant (<I>λ</I>) is provided for several different robustness levels.</P>
IMC Based PI/PID Controller Tuning Rule for Time Delay Processes
Mohammad Shamsuzzoha 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
The motivation of this study is to obtain single PI/PID tuning formula for different type of processes with enhanced disturbance rejection performance. A simple tuning formula gives the consistently better performance as compared to well-known SIMC method at the same degree of robustness for stable and integrating process. The performance of the unstable process has been compared with other recently published method which also shows significant advantage in the proposed method. For the selection of the closed-loop time constant, (τc), a guideline is provided over a broad range of time-delay/time-constant ratios on the basis of the peak of maximum uncertainty (Ms). Comparison of the IAE has been conducted for wide range of θ/τ ratio for the first order time delay process. The proposed method gives better performances for wide range of θ/τ ratio as compared to SIMC while Lee et al. shows poor disturbance rejection in lag dominant process.
A unified approach for proportional-integral-derivative controller design for time delay processes
Mohammad Shamsuzzoha 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
An analytical design method for PI/PID controller tuning is proposed for several types of processes withtime delay. A single tuning formula gives enhanced disturbance rejection performance. The design method is based onthe IMC approach, which has a single tuning parameter to adjust the performance and robustness of the controller. Asimple tuning formula gives consistently better performance as compared to several well-known methods at the samedegree of robustness for stable and integrating process. The performance of the unstable process has been comparedwith other recently published methods which also show significant improvement in the proposed method. Furthermore,the robustness of the controller is investigated by inserting a perturbation uncertainty in all parameters simultaneously,again showing comparable results with other methods. An analysis has been performed for the uncertaintymargin in the different process parameters for the robust controller design. It gives the guidelines of the Ms setting forthe PI controller design based on the process parameters uncertainty. For the selection of the closed-loop time constant,(τc), a guideline is provided over a broad range of θ/τ ratios on the basis of the peak of maximum uncertainty(Ms). A comparison of the IAE has been conducted for the wide range of θ/τ ratio for the first order time delay process. The proposed method shows minimum IAE in compared to SIMC, while Lee et al. shows poor disturbance rejectionin the lag dominant process. In the simulation study, the controllers were tuned to have the same degree of robustnessby measuring the Ms, to obtain a reasonable comparison.
Analytical design of PID controller cascaded with a lead-lag filter for time-delay processes
M. Shamsuzzoha,Seunghyun Lee,이문용 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
An analytical method for the design of a proportional-integral-derivative (PID) controller cascaded with a second-order lead-lag filter is proposed for various types of time-delay process. The proposed design method is based on the IMC-PID method to obtain a desired, closed-loop response. The process dead time is approximated by using the appropriate Pade expansion to convert the ideal feedback controller to the proposed PID•filter structure with little loss of accuracy. The resulting PID•filter controller efficiently compensates for the dominant process poles and zeros and significantly improves the closed-loop performance. The simulation results demonstrate the superior performance of the proposed PID•filter controller over the conventional PID controllers. A guideline for the closed-loop time constant, λ, is also suggested for the FOPDT and SOPDT models.