An Implementation of Different Non Linear PID Controllers on a single Tank level Control using Matlab

Abstract

A Single tank level control system has one rectangular tank which has inflow of liquid into the tank and out flow through valve. The control System is intended to maintain the level of liquid in the tank at some predefined value irrespective of changes inflow of tank. Conventional PID controller gives better results due to changes in load. Thus change in inflow or changes in predefined values are treated as disturbances to the process. According to these disturbances we need to implement better tuning algorithms to PID controllers. But industrial conventional PID controllers exhibits nonlinear output for the given error values. Thus the approach of non linear PID controller is to include the disturbance parameters to conventional PID controller. The behavior is observed with step input. In this paper we implemented different non linear PID control algorithms on tank level control System and their responses are observed.

Controlling a Single Tank Liquid Level System with Classical Control Methods and Reinforcement Learning Methods

“…Selamet et al have implemented the control of the liquid tank system with the most optimal controller parameters by using the PSO algorithm to specify the parameters of the PID and LQR methods [38]. Sastry et al have performed the control of the single tank system using a nonlinear PID controller [39]. Kum et al have carried out the tank system with a sliding mode controller.…”

Design and implementation of PID based flow rate control using PLC

“…Then, the process called tuning defines the parameters of a PID controller. There have been various PID tuning techniques have been implemented and applied by researchers in various PID control structures [4][5][6][7]. It is not possible to realize an analytical approach for the plants which have unknown mathematical models owing to the difficulty in finding controller parameters.…”