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This paper presents liquid level control of interacting spherical tank system using PI controller. The spherical tank is divided into four regions and for each region a particular PI controller is designed. Initially the parameters are tuned using the conventional tuning formulae of Ziegler-Nichols. Although conventional tuning formula gives a good stating solution but it lacks in obtaining all the...
Most of the modern industries have multivariable processes wherein interactions exist. As the process outputs and inputs are coupled, designing controller for MIMO processes is a challenging task. The effective open-loop transfer functions (EOTFs) between the paired process input-output variables have complex high order dynamics. While many of the decoupling control methods uses effective transfer...
In process control industries, one of the major and serious problems is presence of overshoot in controlled variables. This paper deals with elimination of overshoot In step response by using conventional PID controller with cascade lead compensator. In this cascade technique, lead compensator is used in the inner loop and PID controller connected in the outer loop. The process industry consists of...
In many process industries storage tanks are used to restore liquids requiring level control. Liquid height in each tank shows integrating plus dead time (IPDT) behavior. When two such tanks are connected in series gives us a double integrating plus dead time (DIPDT) process. A DIPDT process itself is unstable for step inputs/changes. Hence it is recommended to use a controller for stabilizing the...
In present analysis, based on different tuning techniques for first order plus dead time process (FOPDT) are designed for Pade's approximation of the time delay. The PID controller is used for obtaining the response of the system. The obtained inverse response is compensated by applying inverse response compensator based on the general concept of Smith predictor. The response of the system is compared...
In this paper SOPDT model is approximated using Pade's approximation and PI-PD controller is used to obtain system response where controller parameters are obtained with the help of Ziegler Nichols tuning technique. The response of PI-PD controller is compared with that of PI, PD, PID and it is shown that its response is better than other controllers.
This paper analyzes the performance and robustness of some of the structures of dead-time compensators that have been proposed in literature. The analysis is made using the two most typical models of processes with delay that are found in the process industry. All the structures are compared to a simple two degree of freedom Smith predictor. The comparative analysis shows that for the cases studied...
One of the main problemsin the performance of process industries in first order plusdead time (FOPDT) system is because the presence of time delay in the system which can lead to destabilization of the system. This paper briefly explains about comparative study of two specified optimal performance controller modelling techniques like Two-Point Method (TPM) and Sunderesan and Krishnaswamy Method (SKM)...
In almost all industries the processes are nonlinear in nature. The nonlinear systems Preoccupied for study are the conical tank and spherical tank systems that is approximated to a first order equation. The control of level is carried out by using FOPIC technique. Fractional order calculus is a down order calculus having an area of arithmetic that has the derivative and integral from noninteger order...
This paper presents a new PI tuning method for first order systems with a long dead time. The PI tuning rule is aimed to be simple so that it would be easy to design and apply the controller to industrial processes. The proposed tuning rule is found by z-domain design techniques, in order to get the fastest response without overshoot. The results obtained by the proposed method have been compared...
Proportional, integral and derivative (PID) controller has been widely used in many aspects of the industries since its theory was published. In this paper, a systematic approach for the tuning strategy of MacPID controller parameters for first order plus dead time (FOPDT) model is proposed. This method aims to simplify the process PID parameters adjustment and to achieve a desired effect in the same...
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