Normalized Error-Based PI Controller and Its Application to the DC–DC Buck Converter

Satyajit Chincholkar (), Mohd Tariq (), Majid Poshtan and Mohamed Sharaf
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Satyajit Chincholkar: Department of Electronics and Telecommunication Engineering, School of E&TC Engineering, MIT Academy of Engineering, Pune 412105, India
Mohd Tariq: Department of Electrical Engineering, Zakir Husain College of Engineering and Technology (ZHCET), Aligarh Muslim University, Aligarh 202002, India
Majid Poshtan: Department of Electrical Engineering, Cal Poly State University, San Luis Obispo, CA 93407, USA
Mohamed Sharaf: Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia

Mathematics, 2024, vol. 12, issue 2, 1-15

Abstract: In this article, the structure of the normalized error-based proportional-integral (PI) controller is presented and its application to the DC–DC buck converter is discussed. The main motivation is to overcome the drawbacks of saturation and the limited range of controller gains offered by the traditional PI controller. Initially, the theoretical structure and advantages of an improved PI controller are shown. Next, the problem of regulation of the step-down DC–DC converter is addressed using the proposed controller. The objective is to keep the load voltage constant even when the converter parameters vary. The averaged state-space model of the converter is presented and a detailed stability analysis based on the Lypunov indirect method is carried out. The results show an improved range of controller parameters when the proposed controller is employed. Finally, some simulation results are shown to illustrate the effect of controller parameter variations on the output response. These results also verify the ability of the proposed controller to handle the changes in the load, input voltage, and reference voltage of the converter. Moreover, a comparative simulation study validates the superior transient response of the proposed normalized error-based PI controller over the traditional PI controller.

Keywords: normalized error-based control; buck converters; control system analysis (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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