Industrial Simulation of PID and Modified-MPID Controllers for Coupled-Tank System

Most of the chemical industries required to control the liquid or fluid level in many of the processes unit of process industries. Often it becomes more difficult to control when the tanks are cascaded in coupled as the level of one tank influences the level of other one. The present work attempts to investigate and compare the control behavior of level control of two noninteracting coupled-type systems using conventional PID and modified-MPID control action. Usually, PID controller is used for this purpose with certain limitation such as higher overshoot, response time, settling time, etc. In this work, certain modifications in the conventional PID controllers with PID-PD, PI-PD, and I-PD controllers to overcome these limitations have been presented and compared. The modified-MPID controller simulation results yield the better results when it is applied to control the level of noninteracting coupled-tank system.