New modular structure DC-DC converter without electrolytic capacitors for renewable energy applications

Abstract

Electrolytic capacitors are extensively used in power converters but they are bulky, unreliable, and have short lifetimes. This paper proposes a new capacitor-free high step-up dc-dc converter design for renewable energy applications such as photovoltaics (PVs) and fuel cells. The primary side of the converter includes three interleaved inductors, three main switches, and an active clamp circuit. As a result, the input current ripple is greatly reduced, eliminating the necessity for an input capacitor. In addition, zero voltage switching (ZVS) is achieved during switching transitions for all active switches, so that switching losses can be greatly reduced. Furthermore, a three-phase modular structure and six pulse rectifiers are employed to reduce the output voltage ripple. Since magnetic energy stored in the leakage inductance is recovered, the reverse-recovery issue of the diodes is effectively solved. The proposed converter is justified by simulation and experimental tests on a 1-kW prototype.

Publication DOI: https://doi.org/10.1109/TSTE.2014.2334604
Divisions: College of Engineering & Physical Sciences
Additional Information: © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: DC-DC converter,electrolytic capacitor,fuel cells,modularization,photovoltaics,power loss
Publication ISSN: 1949-3029
Last Modified: 26 Feb 2024 08:16
Date Deposited: 30 Jun 2016 12:25
Full Text Link: http://ieeexplo ... rnumber=6878458
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PURE Output Type: Article
Published Date: 2014-10
Published Online Date: 2014-09-14
Accepted Date: 2014-06-24
Submitted Date: 2014-01-24
Authors: Hu, Yihua
Cao, Wenping (ORCID Profile 0000-0002-8133-3020)
Finney, Stephen J.
Xiao, Weidong
Zhang, Fengge
McLoone, Seán F.

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