Improved cascade control structure for enhanced performance

In conventional single feedback control, the corrective action for disturbances does not begin until the controlled variable deviates from the set point. In this case, a cascade control strategy can be used to improve the performance of a control system particularly in the presence of disturbances. In this paper, an improved cascade control structure and controller design based on standard forms, which was initially given by authors, is suggested to improve the performance of cascade control. Examples are given to illustrate the use of the proposed method and its superiority over some existing design methods

Depth of anesthesia control using internal model control techniques

The major difficulty in the design of closed-loop control during anaesthesia is the inherent patient variability due to differences in demographic and drug tolerance. These discrepancies are translated into the pharmacokinetics (PK), and pharmacodynamics (PD). These uncertainties may affect the stability of the closed loop control system. This paper aims at developing predictive controllers using Internal Model Control technique. This study develops patient dose-response models and to provide an adequate drug administration regimen for the anaesthesia to avoid under or over dosing of the patients. The controllers are designed to compensate for patients inherent drug response variability, to achieve the best output disturbance rejection, and to maintain optimal set point response. The results are evaluated compared with traditional PID controller and the performance is confirmed in our simulation

Tuning Control for Debutanizer Column

The performance of various conventional control strategies was compared against the self tuning Proportional Integral Derivative (PID) controller which examined when been applied in composition control of a debutanizer column. Tuning of PID control strategies studied and analyzed included Smith Predictor control, Internal Mode control, Cascade control, Feedback control and Feedforward-feedback control. The comparisons were done by MATLAB Simulation using Identification Tool (IDENT) and SIMULINK. The comparison for each control strategy performance was studied in terms of response towards set point changes and disturbance rejection towards error, manipulated variable which is valve opening and the scope. The success of control strategies are determined by the stability of the process model obtained from each control strategies

Smith predictor with sliding mode control for processes with large dead times

The paper discusses the Smith Predictor scheme with Sliding Mode Controller (SP-SMC) for processes with large dead times. This technique gives improved load-disturbance rejection with optimum input control signal variations. A power rate reaching law is incorporated in the sporadic part of sliding mode control such that the overall performance recovers meaningfully. The proposed scheme obtains parameter values by satisfying a new performance index which is based on biobjective constraint. In simulation study, the efficiency of the method is evaluated for robustness and transient performance over reported technique

Inverted decoupling internal model control for square stable multivariable time delay systems

Accepted manuscriptThis paper presents a new tuning methodology of the main controller of an internal model control structure for n×n stable multivariable processes with multiple time delays based on the centralized inverted decoupling structure. Independently of the system size, very simple general expressions for the controller elements are obtained. The realizability conditions are provided and the specification of the closed-loop requirements is explained. A diagonal filter is added to the proposed control structure in order to improve the disturbance rejection without modifying the nominal set-point response. The effectiveness of the method is illustrated through different simulation examples in comparison with other works

A survey of recent advances in fractional order control for time delay systems

Several papers reviewing fractional order calculus in control applications have been published recently. These papers focus on general tuning procedures, especially for the fractional order proportional integral derivative controller. However, not all these tuning procedures are applicable to all kinds of processes, such as the delicate time delay systems. This motivates the need for synthesizing fractional order control applications, problems, and advances completely dedicated to time delay processes. The purpose of this paper is to provide a state of the art that can be easily used as a basis to familiarize oneself with fractional order tuning strategies targeted for time delayed processes. Solely, the most recent advances, dating from the last decade, are included in this review

Controller design for periodic disturbance rejection

Master'sMASTER OF ENGINEERIN

Online Implementation Of Imc Based Pid Controller In Batch Esterification Reactor.

Esterification is one of important process that operates in a batch reactor. Since the inherent nonlinear properties of this batch reactor, the control of such reactor to ensure an efficient operation remains a great challenge

Design of Pid Controller for FODPT and IPDT System

One of the past control procedures is the PID control which is used many industries. It can be comprehended on the grounds that it is tuneable effectively and the control structure is basic. In the meantime a few tasteful results have been demonstrated utilizing PID control as a part of control system, in mechanical control despite everything it has an has a widespread variety of presentations. As per a study it has been found that each control area requires PID type for process control systems directed which was studied in 1989. For a long time PID control has been an energetic study subject. Since numerous process plants have comparable dynamics which is PID controlled and it has been found from less plant data it is possible to set acceptable controller. In this few controller design techniques is been presented for PID-type, and resulting details for the tuning algorithms is discussed. The PID control are all described fully, and some differences of the classic PID structure are presented. The perceived experimental Ziegler–Nichols tuning formula and for the PID controller design algorithms approaches have been made for finding the corresponding FOPDT model. Some other simple PID setting formulae such as the Cohen–Coon formula, Chien–Hrones–Reswick formula, Zhuang–Atherton optimum PID controller, Wang–Juang–Chan formula and is presented. Some of the design techniques on PID control is presented, such as Smith predictor design and IMC control design. At long last, a few thoughts on the structure of the controller determinations for process control system are given