scholarly journals Set-Point Tracking and Multi-Objective Optimization-Based PID Control for the Goethite Process

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 36683-36698 ◽  
Author(s):  
Xiaojun Zhou ◽  
Jiajia Zhou ◽  
Chunhua Yang ◽  
Weihua Gui
Keyword(s):  
Pid Control ◽  
Multi Objective Optimization ◽  
Set Point ◽  
Multi Objective ◽  
Point Tracking

Disturbance Rejection FOPID Control of Rotor by Multi-Objective BB-BC Optimization Algorithm

2017 ◽  
Author(s):  
Abdullah Ates ◽  
Baris Baykant Alagoz ◽  
Celaleddin Yeroglu ◽  
Jie Yuan ◽  
YangQuan Chen
Keyword(s):  
Optimization Algorithm ◽  
Flight Control ◽  
Disturbance Rejection ◽  
Low Frequency ◽  
Multi Objective Optimization ◽  
Propulsion Systems ◽  
Set Point ◽  
Multi Objective ◽  
Tuning Method ◽  
Control Application

This paper presents a FOPID tuning method for disturbance reject control by using multi-objective BB-BC optimization algorithm. Proposed method allows multi-objective optimization of set-point performance and disturbance rejection performances of FOPID control system. The objective function to be minimized is composed of the weighted sum of MSE for set-point performance and RDR for disturbance rejection improvement. The proposed optimization performs maximization of RDR and minimization of MSE and it can deal with the tradeoff between RDR performance and step-point performance. Application of the method is shown for auto-tuning of FOPID controller that is employed for control of TRMS model. We observed that low-frequency RDR indices can be used to improve disturbance rejection performance in multi-objective controller tuning problems. Particularly, for flight control application, disturbance reject control is very substantial to robust performance of propulsion systems.

Enhanced Dynamic Set-point Weighting Design for Two-Input-Two-Output (TITO) Unstable Processes

2019 ◽  
Vol 15 (1) ◽  
Author(s):  
Purushottama Rao Dasari ◽  
A. Seshagiri Rao
Keyword(s):  
Pid Control ◽  
Time Delays ◽  
Closed Loop ◽  
Control Law ◽  
Unstable Systems ◽  
Set Point ◽  
Point Tracking ◽  
Unstable Processes ◽  
Tito Systems ◽  
Independent Loops

Abstract Control of unstable systems with time delays usually result in overshoots in the closed loop responses. The intricacy involved in multivariable unstable processes further makes the problem more challenging. In industry, set-point weighting is one of the recommended methods to minimize the overshoot. However, design of the set-point weighting parameters determines the percentage of minimization of the overshoot. In this paper, a method is proposed to design the set-point weighting parameters for unstable multivariable processes which is relatively simple and also reduces the overshoot. Weighting is considered for both proportional (β) and derivative (γ) terms in the PID control law. In the closed loop relation for set-point tracking, the coefficients of ‘s’ and ‘s3’ both in the numerator and denominator are made equal in order to find dynamically β and γ. The obtained expressions for β and γ are simple and dynamically depends on the controller parameters and are applied to TITO systems in present work. Decouplers are used in TITO systems mainly to reduce the interaction between the loops so that they can be viewed as independent loops. Decoupler design suggested by (Hazarika and Chidambaram [1] has been used in this work and two TITO unstable processes with time delays are illustrated here. Comparison with the reported methods available in literature verifies that the proposed method gives improved closed loop performance.

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