Modeling and control of level control process — A comparative study
Tank level control systems are everywhere. All of our process industries mostly depends on this tank level control systems. This paper deals with the modeling and control of a two tank liquid level control system. The considered non linear system is a Single Input Single Output (SISO) system. The goal of the level control is to track the desired level of liquid in to the second tank by controlling the flow rate of the first tank. The tanks are coupled in the interacting and non-interacting ways and a comparison is made between these two systems. The mathematical modeling is done by mass balance method and the PID controller is designed by the trial and error method. The system is simulated with both open loop and closed loop conditions. A comparative study of the time domain response of the two systems while using the PID controller is done by the MATLAB simulation.
Comparative Performance Analysis for Two Tanks Liquid Level Control System with Various Controllers using Matlab
AbstractLiquid level control in tanks and between tanks are basic industrial problem. Often the tanks are so coupled in interacting and non-interacting way they exhibit non-linear behaviour. This paper deals with the level control of two tank system which are connected in interacting and non-interacting mode to control the level of system. In interacting mode the level of first tank will depend on the level of second tank while in case of noninteracting mode level of first tank is independent of level of second tank. Here comparative analysis of the transient response obtained by different controllersConventional controller PID, Feed forward-feedback controller, IMC (Internal Model Controller) and Fuzzy Logic Controller has been done using MATLAB simulation. It has been observed that IMC performs better than other controllers for both interacting and non-interacting mode.
Level Control System using Feedback and F eedforward -Feedback Configuration
A multi tank level control system includes both the example of interacting and non-interacting system. In this system, we have considered three tanks each having equal area and each tank can be assumed as a first order system which are connected in interacting and non-interacting mode. The control system is intended to maintain the level of the third tank at some predefined value irrespective of changes of inflow of first tank. Conventional PID controller is a powerful controller used in process industries to regulate and control process variables. In this paper, we also consider the effect of the disturbance on the response of the system. According to these disturbances, we need to implement feed forward controller with better tuning algorithm. Thus, we implement transfer function of above system and behaviour is observed with step input.