Modeling and Performance analysis of FOPID controller for Interacting Coupled Tank System

Abstract

Process control is essential in the industrial process because it guarantees the safety and optimization in a process. Additionally, process control is a useful tool to satisfy the environmental procedure and product quality necessities. In industries, one of the controlling process variables are liquid level, the liquid level controllers are a significant concern popular process and collective illustrative also real-world in engineering methods. Liquid level coupled tank system can be arranged into two fashionable forms of interacting and non- interacting form. In this thesis work only focus on interacting coupled tank control systems, there are many problems which affected the liquid level like nonlinearity of the system, modeling uncertainties and complex analysis, so to overcome those problems, and obtain constant stable output and fast response various controllers are required. Industrial control engineering requires fluid moved and reserved in a container. This thesis work presents the performance analysis of fractional order-PID controller for governing a liquid level of the tank system. Also for more validation of this work test other method of controllers. Various types of fractional-order (FOPID, TID, CRONE, and FOLL) controller and from those fractional order controller techniques FOPID and TID control will be tested to get compare the performance of interacting coupled tank system. The output response is conducted within MATLAB®/Simulink® situation to verify the performances of the system in terms of rising Time (Tr), settling time (Ts), delay time (Td), peak time (Tp), undershoot and Overshoot (Os). The simulation result shows that controlling interacting CTS without disturbance the response is good, but including external disturbance on the second tank the controllers tested on this work is show week response except FOPID controller. The reason is FOPID controller has two more adjust parameter those increase the robustness of the system. From the controllers tested in this thesis work the fractional order proportional integral derivative controller (FOPID) has good performance compare to PID, TID, and digital-PID controllers that tested on this thesis. The performance specification of FOPID controller Os is 14.368%, Tp is 1.014sec, Td is 0.338sec, Ts is 3.581sec and Tr is 336.485ms𝑒𝑐.