Differential buck single phase grid connected AC-DC converter with active power decoupling using a flipping Capacitor

Gottardo, Davide; De Lillo, Liliana; Empringham, Lee; Costabeber, Alessando

Abstract

This paper introduces a new single-phase AC-DC converter capable of achieving independent voltage control across a dedicated power decoupling capacitor, by exploiting the same full bridge that controls the grid current in combination with two bidirectional switches, soft com¬mutated at the line frequency (ZVS). A suitable control of the capacitor voltage is used to completely decouple pulsating grid power from the DC-link, enabling the use of smaller film capacitors instead of electrolytic capacitors for power decoupling, improving reliability and increasing power density. This is achieved without additional high switching frequency devices. Furthermore, the interference occurring between rectified grid current and power decoupling capac¬itor current is exploited in order to reduce the RMS current in the full bridge, thus improving conversion efficiency.


This work is being developed at University of Nottingham within the framework of project SENSIBLE.

Citation

Gottardo, D., De Lillo, L., Empringham, L., & Costabeber, A. Differential buck single phase grid connected AC-DC converter with active power decoupling using a flipping Capacitor. Presented at 8th International Symposium on Power Electronics for Distributed Generation Systems (PEDG 2017)

• Conference Name: 8th International Symposium on Power Electronics for Distributed Generation Systems (PEDG 2017)
• End Date: Apr 20, 2017
• Acceptance Date: Feb 6, 2017
• Online Publication Date: Jul 11, 2017
• Publication Date: Apr 18, 2017
• Deposit Date: Sep 21, 2017
• Publicly Available Date: Sep 21, 2017
• Peer Reviewed: Peer Reviewed
• Keywords: Stress, Power electronics
• Public URL: https://nottingham-repository.worktribe.com/output/856278
• Publisher URL: http://ieeexplore.ieee.org/document/7972438/
• Related Public URLs: https://www.pedg2017.org/
• Additional Information: © 2017 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. This conference is published at ISSN 2329-5767.
• Contract Date: Sep 21, 2017