Control System Design for 3×3 Processes Based on Effective Transfer Function and Fractional Order Filter
G. Hemanth Krishna1, R. Kiranmayi2, M. Rathaiah3
1G.Hemanth Krishna, PG Student, Department of EEE, JNTUA, Anantapur (A.P), India.
2R.Kiranmayi, Professor, Department of EEE, JNTUA, Anantapur (A.P), India.
3M.Rathaiah, Assistant Professor, (Ad-hoc), Department of EEE, JNTUA, Anantapur (A.P), India.
Manuscript received on 16 August 2019 | Revised Manuscript received on 28 August 2019 | Manuscript Published on 06 September 2019 | PP: 637-642 | Volume-8 Issue- 6S, August 2019 | Retrieval Number: F11270886S19/19©BEIESP | DOI: 10.35940/ijeat.F1127.0886S19
Open Access | Editorial and Publishing Policies | Cite | Mendeley | Indexing and Abstracting
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (

Abstract: Designing of PI/PID controller with fractional order set point filter is proposed to achieve the improved performance of 3×3 processes. But the design of controller for such higher dimensional multivariable processes is too difficult task because of interaction involved between the process variables. So interaction must be taken into design consideration. In this method of design determines the interaction between the variables using RGA and RNGA methods and uses it in converting the multivariable processes into multiple single loops. The interaction problems between the loops are overcome by incorporating the decouplers in the control loops. Then, the Effective Transfer Function (ETF) has obtained to design PI/PID controller for each individual element as in single input processes. The fractional order filter is also added to improve the servo response of the processes. Hence, the proposed system improves the overall performance by minimizing the interaction effects due to set point variations. This method is also validate by using a case study.
Keywords: Interactive Process, Relative Gain Array, Effective Open Loop Process, Multivariable Processes, Fractional Order Filter, Decoupler.
Scope of the Article: Low-power design