A Unified Controller Design Method for Multiple Control Structure with Perspective to Parametric Independent Control of Boost Converter

Document Type : Article

Authors

Department of Electrical Engineering, National Institute of Technology, Patna 800005, Bihar, India

10.24200/sci.2024.62633.7945

Abstract

In this work, a unified approach for controller design has been presented which can be used in different control structures. To validate the proposal, output voltage regulation of the boost converter has been considered as control problem. The control structure considered are single feedback control structure, parallel control structure, two-degree of freedom internal model control structure and cascade control structure. In these control structures, the transfer function model obtained through simple closed-loop test has been used to derive the controller parameter. This modelling makes the control scheme independent of boost converter circuit parameter information as well as loads. The controller parameters in all these structures have been obtained through direct synthesis design in frequency domain. Experimental results for nominal and perturbed values are illustrated under changing set-point command and load-disturbance (variation in input voltage and duty cycle). Using small gain theorem, robustness of all the structures is evaluated where cascade control structure is found to have stability of 60% change in gain uncertainty. Performance of cascade structure is observed to be better in comparison with other structures. The control performance of the proposed work has also been compared with the recently reported works.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 16 April 2024

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