396e3d57186c1f28fcb-3f22 20230420062738275 beie:beie director@blueeyesintelligence.org WEB-FORM International Journal of Innovative Technology and Exploring Engineering IJITEE 22783075 10.35940/ijitee https://www.ijitee.org/ 05 30 2023 12 6 Associate Professor, Department of Chemical Engineering, Gayatri Vidya Parishad College of Engineering,Madhurawada, Visakhapatnam (A.P), India Rao Dr. C.V. Nageswara https://orcid.org/0000-0001-5308-885X Putta Mr. Vihari Operations Manager, Coal Gassification Plant, JSP-Angul, Odisha, India. Design of centralized PI controllers for multivariable non square systems is proposed in the present work. The centralized controller is designed based on the direct synthesis method. The method includes approximating the inverse of the process transfer matrix with the effective transfer function matrix. The effective transfer function for each element in the process transfer function matrix is derived by using the relative normalized gain array (RNGA), and relative average residence time array (RARTA) concepts proposed by Cai et al [1]. The transfer function models used in the present work include first order processes with time delay (FOPDT). Maclaurin series is applied to reduce the resulting controllers in to standard PI forms. The design method requires a single tuning parameter (filter time constant) to adjust the performance of the controller. Simulation study is carried out for various case studies and the results show the advantage of proposed method over the literature reported methods. The control algorithms are comparatively analyzed using standard robust stability measure. The designed controllers give a good performance with lesser interaction compared to the literature methods, Davison Method [2] and Tanttu and Lieslehto’s method [3]. 05 30 2023 1 10 CC BY-NC-ND 4.0 10.35940/BEIESP.CrossMarkPolicy www.ijitee.org true No, I did not receive. No conflicts of interest to the best of our knowledge. No, the article does not require ethical approval and consent to participate with evidence. Not relevant. Mr. Putta Vihari has worked to obtain the data for the case study considered. Accordingly, the controller design methodology is decided upon. Second Author, Dr. C. V. Nageswara Rao took up the simulation study using a Simulation tool while training the first author. A method of RNGA based controller design is utilized based on the brainstorming discussion among the authors. As there are few research works which addressed non-square systems this methodology is adopted. Mostly PI controller would suffice maximum variables to control and hence design of PI controller. 10.35940/ijitee.F9518.0512623 https://www.ijitee.org/portfolio-item/F95180512623/