Title: A multi-port non-isolated bidirectional DC-DC converter

Authors: Sepideh Bahravar; Karim Abbaszadeh; Javad Olamaei

Addresses: Department of Electrical and Computer Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran ' Department of Electrical and Computer Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran ' Department of Electrical and Computer Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran

Abstract: In this paper, an extended topology for the design of a high voltage gain n-port bidirectional DC-DC converter with decreased voltage stress on the switches is developed. First, dual-port and three-port conventional converters are investigated; afterwards, the extended four and n-port bidirectional converters are analysed based on the concept of these basic models. Some advantages of the proposed topology are its simple configuration with a reduced number of switches and small size due to the use of no transformer in the topology. In the results, the voltage stress on switches, minimum and maximum current values of the inductors and the voltage gain between the lower voltage source and the upper one are calculated for the extended n-port converter. As a typical case, a four-port converter is designed and simulated by the PSCAD software and by controlling the duty cycle of the converter, which is extracted from an incremental conduction algorithm, the maximum power of the photovoltaic (PV) module is extracted in varying environmental conditions. In addition, to validate the operational performance of the four-port converter and evaluate the presented analysis, a prototype was fabricated and the experimental results were also presented.

Keywords: bidirectional DC-DC converter; photovoltaic module; maximum power point tracking; MPPT; multi-port DC-DC converter; non-isolated DC-DC converter.

DOI: 10.1504/IJPELEC.2022.119796

International Journal of Power Electronics, 2022 Vol.15 No.1, pp.86 - 115

Received: 12 Jun 2019
Accepted: 16 Sep 2019

Published online: 16 Dec 2021 *

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