Design of IMC filter for PID control strategy of open-loop unstable processes with time delay

2010 ◽  
Vol 7 (1) ◽  
pp. 93-110 ◽  
Author(s):  
M. Shamsuzzoha ◽  
Mikhail Skliar ◽  
Moonyong Lee
Keyword(s):  
Time Delay ◽  
Control Strategy ◽  
Pid Control ◽  
Open Loop ◽  
Unstable Processes

scholarly journals Sliding Mode Control with Dynamical Correction for Time-Delay Piezoelectric Actuator Systems

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 132 ◽  
Author(s):  
Javier Velasco ◽  
Oscar Barambones ◽  
Isidro Calvo ◽  
Joseba Zubia ◽  
Idurre Saez de Ocariz ◽  
...  
Keyword(s):  
Time Delay ◽  
Sliding Mode Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Open Loop ◽  
Open Loop Control ◽  
Loop Control ◽  
Mode Control ◽  
Control Response ◽  
Dynamical Correction

In piezoelectric actuators (PEAs), which suffer from inherent nonlinearities, sliding mode control (SMC) has proven to be a successful control strategy. Nonetheless, in micropositioning systems with time delay, integral proportional control (PI), and SMC, feedback control schemes have a tendency to overcompensate and, consequently, high controller gains must be rejected. This may produce a slow and inaccurate response. This paper presents a novel control strategy that deals with time-delay micropositioning systems aimed at achieving precise positioning by combining an open-loop control with a modified SMC scheme. The proposed SMC with dynamical correction (SMC-WDC) uses the dynamical system model to adapt the SMC inputs and avoid undesirable control response caused by delays. In order to develop the SMC-WDC scheme, an exhaustive analysis on the micropositioning system was first performed. Then, a mixed control strategy, combining inverse open-loop control and SMC-WDC, was developed. The performance of the presented control scheme was analyzed and compared experimentally with other control strategies (i.e., PI and SMC with saturation and hyperbolic functions) using different reference signals. It was found that the SMC-WDC strategy presents the best performance, that is, the fastest response and highest accuracy, especially against sudden changes of reference setpoints (frequencies >10 Hz). Additionally, if the setpoint reference frequencies are higher than 10 Hz, high integral gains are counterproductive (since the control response increases the delay), although if frequencies are below 1 Hz the integral control delay does not affect the system’s accuracy. The SMC-WDC proved to be an effective strategy for micropositioning systems, dealing with time delay and other uncertainties to achieve the setpoint command fast and precisely without chattering.

Feedback Filter PID Control for Integrator and Time Delay Processes

2012 ◽  
Vol 490-495 ◽  
pp. 1321-1325
Author(s):  
Wei Tang ◽  
Xiao Xiang Ji
Keyword(s):  
Time Delay ◽  
Pid Control ◽  
Pid Controller ◽  
Control Method ◽  
Open Loop ◽  
Point Tracking ◽  
Feedback Model ◽  
Pole Type ◽  
Simulation Results ◽  
Controlled Object

A PID controller based on a typical feedback model is introduced because of instability of a kind of integrator and time delay process on open-loop condition. All-pole-type approximating method is adopted to deal with delay part of the controlled object approximately,and confirmed parameters of PID controller is obtained by importing a strategy of confirming parameters of PID controller based on a kind of typical feedback model from IMC principle.The designed control method shows better set point tracking performance based on initialed parameters point and better interference suppression performance of the controlled object.The structure of the controller is simple, and parameters are easy to adjust, the improved controller is easy to apply to practical projects.The simulation results show its effectiveness

An Enhanced PID Control Strategy for Unstable Processes

Automatica ◽  
1998 ◽  
Vol 34 (6) ◽  
pp. 751-756 ◽  
Author(s):  
JIN HYUN PARK ◽  
SU WHAN SUNG ◽  
IN-BEUM LEE
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Unstable Processes

PID Control of Unstable Processes with Time Delay: A Comparative Study

2007 ◽  
Vol 40 (2) ◽  
pp. 145-163 ◽  
Author(s):  
Han-Qin Zhou ◽  
Qing-Guo Wang ◽  
Leang-San Shieh
Keyword(s):  
Time Delay ◽  
Comparative Study ◽  
Pid Control ◽  
Unstable Processes

PID Control of Unstable Processes with Time Delay

2009 ◽  
Vol 33 (5) ◽  
pp. 721-728 ◽  
Author(s):  
Soo-Lyong Lee ◽  
Yun-Hyung Lee ◽  
Jong-Kap Ahn ◽  
Jung-Ki Son ◽  
Ki-Tak Ryu ◽  
...  
Keyword(s):  
Time Delay ◽  
Pid Control ◽  
Unstable Processes
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