scholarly journals Fractional-Order Predictive PI Controller for Dead-Time Processes With Set-Point and Noise Filtering

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 183759-183773
Author(s):  
P. Arun Mozhi Devan ◽  
Fawnizu Azmadi B. Hussin ◽  
Rosdiazli Ibrahim ◽  
Kishore Bingi ◽  
Hakim Q. A. Abdulrab
Keyword(s):  
Fractional Order ◽  
Dead Time ◽  
Pi Controller ◽  
Noise Filtering ◽  
Set Point

Practical Tuning Rule Development for Fractional Order Proportional and Integral Controllers

2008 ◽  
Vol 3 (2) ◽  
Author(s):  
YangQuan Chen ◽  
Tripti Bhaskaran ◽  
Dingyü Xue
Keyword(s):  
Fractional Order ◽  
Dynamic Systems ◽  
Disturbance Rejection ◽  
Dead Time ◽  
Pi Controller ◽  
First Order ◽  
Tuning Method ◽  
Peak Sensitivity ◽  
Practical Nature ◽  
Tuning Rules

This paper presents a new practical tuning method for fractional order proportional and integral (FO-PI) controller. The plant to be controlled is mainly first order plus delay time (FOPDT). The tuning is optimum in the sense that the load disturbance rejection is optimized yet with a constraint on the maximum or peak sensitivity. We generalized Ms constrained integral (MIGO) based controller tuning method to handle the FO-PI case, called F-MIGO, given the fractional order α. The F-MIGO method is then used to develop tuning rules for the FOPDT class of dynamic systems. The final developed tuning rules only apply the relative dead time τ of the FOPDT model to determine the best fractional order α and at the same time to determine the best FO-PI gains. Extensive simulation results are included to illustrate the simple yet practical nature of the developed new tuning rules. The tuning rule development procedure for FO-PI is not only valid for FOPDT but also applicable for other general class of plants.

Fractional-order Predictive PI Controller for Process Plants with Deadtime

2020 ◽  
Author(s):  
P. Arun Mozhi Devan ◽  
Fawnizu Azmadi Hussin ◽  
Rosdiazli Ibrahim ◽  
Kishore Bingi ◽  
Hakim Abdulrab
Keyword(s):  
Fractional Order ◽  
Pi Controller ◽  
Process Plants

Automatic control for DO and pH in the activated sludge process in a coke wastewater treatment plant

1998 ◽  
Vol 37 (12) ◽  
pp. 141-148 ◽  
Author(s):  
B. K. Lee ◽  
S. W. Sung ◽  
H. D. Chun ◽  
J. K. Koo
Keyword(s):  
Wastewater Treatment ◽  
Control System ◽  
Activated Sludge ◽  
Automatic Control ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Pi Controller ◽  
Activated Sludge Process ◽  
Set Point ◽  
Coke Wastewater

The objective of this study is to develop an automatic control system for dissolved oxygen (DO) and pH of the activated sludge process in a coke wastewater treatment plant. A discrete type autotuned proportional-integral (PI) controller using an auto-regressive exogenous (ARX) model as a process model was developed to maintain the DO concentration in aerators by controlling the speed of surface aerators. Also a nonlinear pH controller using the titration curve was used to control the pH of influent wastewater. This control system was tested in a pilot scale plant. During this pilot plant experiment, there was small deviation of pH and the electric power consumption of surface aerators was reduced up to 70% with respect to the full operation when the DO set point was 2 mg/l. For real plant operation with this system, the discrete PI controller showed good tracking for set point change. The electricity saving was more than 40% of the electricity consumption when considering surface aerators. As a result of maintaining the DO constantly at the set point by the automatic control system, the fluctuation of effluent quality was decreased and overall improvement of the effluent water quality was achieved.

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