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Research Article

Design and analysis of quasi-resonant high-gain impedance source DC–DC converter for DC microgrid

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Received 30 Sep 2022, Accepted 16 Jul 2023, Published online: 04 Sep 2023
 

ABSTRACT

This paper presents a quasi-resonant, isolated, high-gain, Y-source, DC/DC converter for a DC microgrid. Here, quasi-resonance is obtained by the LC tank during the shoot through period, resulting in natural commutation at the turn-off instant of the MOSFETs. The LC tank is formed by an additional parallel capacitor (Cp) and transformer leakage inductance. The high voltage gain is obtained by including an isolation transformer with lower turns ratio, coupled inductor and voltage doubler. Here, frequency is modulated to regulate the output voltage with ON period (Ton) constant. This converter’s zero current switching feature allows it to operate at a higher switching frequency and thus enhances the power density and efficiency. This converter’s continuous input current feature is an added advantage. The proposed converter inherits all the benefits of traditional impedance source converters. Finally, a 250 W hardware prototype is developed, and its performance is tested in the laboratory.

Abbreviations

Ap=

Area product

AC=

Alternating current

CIC=

Continuous input current

DC=

Direct current

DG=

Distributed generation

DIC=

Discontinuous input current

dST=

Shoot-through duty

HFT=

High-frequency transformer

ISC=

Impedance source converter

LED=

Light-emitting diodes

PV=

Photovoltaic

RCD=

Resistor-capacitor-diode

RES=

Renewable energy sources

ZCS=

Zero current switching

Disclosure statement

No potential conflict of interest was reported by the author(s).

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