Set point weighted modified Smith predictor for delay dominated integrating processes

2019 ◽  
Author(s):  
Somak Karan ◽  
Chanchal Dey
Keyword(s):  
Smith Predictor ◽  
Set Point ◽  
Modified Smith Predictor

scholarly journals Set Point Weighted Modified Smith Predictor for Higher Order Integrating Processes with Time Delay

2019 ◽  
Vol 8 (4) ◽  
pp. 11237-11239 ◽  
Keyword(s):  
Time Delay ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Higher Order ◽  
Smith Predictor ◽  
Control Synthesis ◽  
Pid Controllers ◽  
Set Point ◽  
Point Tracking ◽  
Modified Smith Predictor

This Paper Presents About The Synthesis Of Two-Degree-Of-Freedom Control Structure Based On Modified Smith Predictor Control For Higher Order Integrating Processes With Time Delay. This Control Synthesis Is Done Based On Chengqiang Yin Method. It Has Two Pid Controllers- One Is Set Point Tracking Controller Based On Direct Synthesis Method And The Other Is Disturbance Rejection Controller Based On Imc Principle. In This Work, A Set Point Weight Is Added With Pid Controller To Reduce Peak Overshoots And Settling Time In The Modified Smith Predictor. Two Simulation Examples Are Given To Demonstrate The Validity Of This Method.

scholarly journals Enhanced PID Controllers Design Based on Modified Smith Predictor Control for Unstable Process with Time Delay

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Chengqiang Yin ◽  
Jie Gao ◽  
Qun Sun
Keyword(s):  
Time Delay ◽  
Disturbance Rejection ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Engineering Application ◽  
Smith Predictor ◽  
Superior Performance ◽  
Set Point ◽  
Point Tracking ◽  
Modified Smith Predictor

A two-degree-of-freedom control structure is proposed for a class of unstable processes with time delay based on modified Smith predictor control; the superior performance of disturbance rejection and good robust stability are gained for the system. The set-point tracking controller is designed using the direct synthesis method; the IMC-PID controller for disturbance rejection is designed based on the internal mode control design principle. The controller for set-point response and the controller for disturbance rejection can be adjusted and optimized independently. Meanwhile, the two controllers are designed in the form of PID, which is convenient for engineering application. Finally, simulation examples demonstrate the validity of the proposed control scheme.

Simplified tuning of IMC based modified smith predictor for UFOPDT processes

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Somak Karan ◽  
Chanchal Dey
Keyword(s):  
Closed Loop ◽  
Performance Enhancement ◽  
Chemical Reactor ◽  
Internal Model Control ◽  
Smith Predictor ◽  
Tuning Parameter ◽  
Set Point ◽  
Point Tracking ◽  
Model Control ◽  
Modified Smith Predictor

AbstractA simplified tuning guideline for internal model control (IMC) based modified Smith predictor technique is reported here for unstable lag dominated first-order processes with dead time (UFOPDT). Pole location in right half section of s-plane signifies the unstable behaviour of UFOPDT processes. Mostly, chemical processes like isothermal chemical reactor, bioreactor, dimerization reactor, fluid catalytic cracker etc. are found to be lag dominated and unstable along with considerable time delay. Smith predictor technique based control methodology is considered to be a well-accepted approach for such cases. However, conventional Smith predictor technique is not capable enough for controlling UFOPDT processes. Whereas modified Smith predictor is found to be quite competent in such cases as its design involves more than one controller. Modified Smith predictor structure is capable to provide desirable closed loop response during set point tracking along with the load recovery phases. To mitigate the tuning complexity of multiple controllers involved in modified Smith predictor designing, suggested IMC structure employs single tuning parameter λ i.e. closed loop time constant for all three controllers concerned. Noticeable performance enhancement is reported by the proposed scheme as no overshoot is observed during set point tracking. Moreover, smooth and efficient load rejection behaviour is also obtained. Supremacy of the proposed tuning is established through closed loop performance comparison with others’ reported modified Smith predictor based tuning relations for chemical reactor and bioreactor in terms of performance indices as well as stability margins.

Performance Analysis of Modified Smith Predictor for Integrating and Time-Delay Processes

2011 ◽  
Vol 53 (4) ◽  
pp. 261-270
Author(s):  
G. Saravana Kumar ◽  
R.S.D. Wahidabanu ◽  
K.G. Arun Raajesh
Keyword(s):  
Time Delay ◽  
Performance Analysis ◽  
Smith Predictor ◽  
Modified Smith Predictor
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