Design of PI controller for Liquid Level System using Siemens Distributed Control System
C. B. Kadu1, Sujata Tidame2, P. S. Vikhe3, S. M. Turkane4

1C. B. Kadu*, Instrumentation & Control Engineering, Pravara Rural Engineering College, Loni, India.
2Sujata Tidame, Instrumentation & Control Engineering, KBT College of Engineering, Nashik, India.
3P. S. Vikhe, Instrumentation & Control Engineering, Pravara Rural Engineering College, Loni, India.
4S. M. Turkane, Electronics & Telecommunication Engineering, Pravara Rural Engineering College, Loni, India. 

Manuscript received on 5 August 2019. | Revised Manuscript received on 11 August 2019. | Manuscript published on 30 September 2019. | PP: 2783-2789 | Volume-8 Issue-3 September 2019 | Retrieval Number: C5005098319/2019©BEIESP | DOI: 10.35940/ijrte.C5005.098319
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: The PI controller design for a liquid level system using the weighted geometric center method is discussed. Every real-time process have dead time. This dead time leads to the generation of oscillation in the system response. The oscillation generated due to dead time introduces instability in system performance. This paper presents a tuning method based on calculating a geometric center in the stability region for a higher order system. In this, the stability region calculated by plotting (Kp, Ki)-plane based on boundary locus stability technique. Further centre point computed in the stability locus by a geometric center method. This center point will provide Kp, Ki value for tuning the PI controller. The First Order Plus Dead Time (FOPDT) process considered to elaborate the method for computing the tuning parameters. A nonlinear time-delay system and a plant having time-delay response are controlled in simulation. The performance of the newly obtained PI controller based on weighted geometric center method is compared with the existing results to show the usefulness of the control scheme. Moreover, disturbance rejection ability of the newly obtained PI controller based on weighted geometric center method is demonstrated by applying disturbances. In addition, the designed controller implemented using Siemens DCS PCS7 V8.1 platform.
Keywords: PI Controller, Weighted Geometric Center, Stability Boundary Locus, Siemens Distributed Control System.

Scope of the Article:
Distributed Computing