Research of Smith Predictor Algorithm used in Large Time- Delay System

2012 ◽  
Vol 4 (16) ◽  
pp. 209-218
Author(s):  
Zhou Zhe Min
Keyword(s):  
Time Delay ◽  
Large Time ◽  
Delay System ◽  
Smith Predictor ◽  
Time Delay System

Simulation and Analysis to Control Algorithms of the Large Time-Delay System Based on Simulink

2012 ◽  
Vol 532-533 ◽  
pp. 654-658
Author(s):  
Shi Zhe Li ◽  
Yong Guang Ma ◽  
Zheng Zhao
Keyword(s):  
Time Delay ◽  
Large Time ◽  
Industrial Process ◽  
Fast Response ◽  
Delay System ◽  
Smith Predictor ◽  
Model Parameters ◽  
Time Delay System ◽  
Industrial Process Control ◽  
Delay Phenomenon

Because of the universal existence of time-delay phenomenon in industrial process control, this paper analyzes the characteristics of two kinds of control methods, discusses the relations between general control algorithm and Smith predictor compensation, and simulated studies the mismatch of model, the change of delay time and the effect of the disturbance to the system. Simulation results show that: improved Smith predictor controller has the advantages of fast response and low overshoot. Especially in the case of the mismatch of model, it has better robustness and stronger anti-interference ability. The improved Smith predictor brings a good quality, which has little sensitivity to the model parameters. It provides a kind of method to overcome the time delay.

Robust Fractional Order Proportional Integral Control for Large Time-Delay System

2014 ◽  
Vol 716-717 ◽  
pp. 1614-1619
Author(s):  
Rui Hao Xin ◽  
Chun Yang Wang ◽  
Xue Lian Liu ◽  
Ming Qiu Li ◽  
Duan Yuan Bai
Keyword(s):  
Time Delay ◽  
Fractional Order ◽  
Delay Time ◽  
Large Time ◽  
Delay System ◽  
Order System ◽  
Time Delay System ◽  
Proportional Integral ◽  
Integral Controller ◽  
Proportional Integral Controller

In this paper, a new control method for large time delay system is proposed. Firstly, the decreasing time delay controller is used to remodel large delay time plant into small delay time plant. Then, a fractional robust proportional-integral controller (FOPI) is designed, using the phase margin and cut-off frequency at a specified point in the Bode plot of flat robust conditions, to guarantee the desired control performance and the robustness of the high order system to the gain order system. For comparison between the fractional order proportional integral controller and the traditional integer order PID (IOPID) controller, the IOPID controller is also designed following the same proposed tuning specifications. The simulation results indicates that the both designed controllers work efficiently. Furthermore, the FOPI controller makes the large time-delay system get better control effect, the system has high robustness, adaptive ability and anti-jamming ability.

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