PID Tuning and Implementation for Level Control Loop Using Delta V DCS

The proposed work focuses on PID tuning method and liquid level control loop implementation. Liquid level control is a sluggish system, hence different tuning methods for tuning PID viz; Internal Model Control method, Ziegler Nichols tuning method, Cohen Coon tuning method and Direct Synthesis tuning method were considered. PID tuning is done using MATLAB and real time PID implementation is done using Delta V DCS system. Simulation studies in MATLAB and real time implementation in DCS is compared to see the performance of the system. The comparative studies show that the simulation results varies from the real time implementation results. Simulation and real time implementation utilizing different PID tuning parameters, viz; ZN, CC, IMC, and DS, reveals that the IMC method of tuning gives the better step response of the PID controller for liquid level system.