Multileg Interleaved Buck Converter for EV Charging: Discrete-Time Model and Direct Control Design

Stefania Cuoghi, Riccardo Mandrioli, Lorenzo Ntogramatzidis and Grandi Gabriele
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Stefania Cuoghi: School of Electrical Engineering, Computing and Mathematical Sciences, Curtin University, 6102 Bentley, Australia
Riccardo Mandrioli: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40121 Bologna, Italy
Lorenzo Ntogramatzidis: School of Electrical Engineering, Computing and Mathematical Sciences, Curtin University, 6102 Bentley, Australia
Grandi Gabriele: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40121 Bologna, Italy

Energies, 2020, vol. 13, issue 2, 1-18

Abstract: This paper presents the modeling and the implementation of the digital control of a multileg interleaved DC-DC buck converter for electrical vehicle (EV) charging. Firstly, we derive a discrete averaged model of an n-leg interleaved buck converter (IBC). Secondly, we present a direct tuning procedure for one primary discrete PIDF (PID + filter) and multiple secondary PI controller. The objective of the control system is to regulate the current flow in each leg of the converter. This task is accomplished by introducing a novel control paradigm that simultaneously addresses two aims: on the one hand, the control scheme must guarantee an acceptable level of robustness under load variations; while on the other, an even distribution of power on each leg must be ensured at any operational condition. The proposed strategy hinges on a technique that combines simplicity and precision in the fulfillment of design frequency specifications. We use simulations and a digital signal processor (DSP) based experimental implementation of the design technique to validate the proposed methodology.

Keywords: buck converter; interleaved converter; electric vehicle; phase margin; gain crossover frequency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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