LQR based Control Strategies for a Spherical Tank Level Process
Ka. Suriyaprabha1, D. Rathikarani2

1Ka. Suriyaprabha*, Department of Instrumentation and Control Engineering, A.V.C. College of Engineering, Mayiladuthurai, Tamil Nadu, India.
2Dr. D. Rathikarani, Department of Electronics and Instrumentation Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India.
Manuscript received on January 12, 2020. | Revised Manuscript received on January 22, 2020. | Manuscript published on February 10, 2020. | PP: 2637-2641 | Volume-9 Issue-4, February 2020. | Retrieval Number: D1578029420/2020©BEIESP | DOI: 10.35940/ijitee.D1578.029420
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Abstract: Spherical tank finds wide application in gas plants and process industries, petro chemical industries, paper manufacturing and water treatment industries. In a spherical tank, controlling the level is a critical entity. Due to change in shape, the system displays high nonlinear behavior which in turn exhibits the non-linear characteristics. The system’s nonlinearity complicates in the design of conventional PI controllers. In this work, The PI controller gains are formulated as the optimal state-feedback gains. A PSO has been accustomed optimally discover the weighting matrices, related to the various optimum state-feedback regulator design whereas minimizing ISE and the controller effort. The performance of the proposed PSO based LQRPI controller is contrasted with those of GA-LQRPI and LQRPI controllers. 
Keywords: Spherical Tank, PI Controller, LQR and PSO.
Scope of the Article: Control and Automation