A high-efficiency high energy density buffer architecture for power pulsation decoupling in grid-interfaced converters

Shibin Qin, Yutian Lei, Christopher Barth, Wen Chuen Liu, Robert Carl Nikolai Pilawa Podgurski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A high-efficiency high-energy-density buffer architecture is proposed for power pulsation decoupling in power conversion between DC and single phase AC. We present an active decoupling solution that yields improved efficiency and reduced circuit complexity compared to existing solutions. By connecting a buffer converter in series with the main decoupling capacitor, the main capacitor is allowed larger ripple for improved energy utilization (and thus much reduced volume), while the DC bus voltage is maintain close to ripple free. The buffer converter has low voltage stress and is only processing a small fraction of the total power of the entire architecture, allowing a very small active circuit volume and very high system efficiency. A control scheme is proposed to exploit the small remaining bus ripple to compensate the power loss in the power converter and balance the power cycle of the buffer architecture. A 2 kW hardware prototype has been built to demonstrate the benefit of the proposed solution. The hardware prototype achieves 20 times capacitance reduction and 2 times overall volume reduction compared to the conventional passive decoupling solution. An energy density of 110 W/inch3 and an efficiency above 98.7% across a wide load range has been experimentally verified.

Original languageEnglish (US)
Title of host publication2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages149-157
Number of pages9
ISBN (Electronic)9781467371506
DOIs
StatePublished - Oct 27 2015
Event7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015 - Montreal, Canada
Duration: Sep 20 2015Sep 24 2015

Publication series

Name2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015

Other

Other7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015
CountryCanada
CityMontreal
Period9/20/159/24/15

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Qin, S., Lei, Y., Barth, C., Liu, W. C., & Pilawa Podgurski, R. C. N. (2015). A high-efficiency high energy density buffer architecture for power pulsation decoupling in grid-interfaced converters. In 2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 (pp. 149-157). [7309682] (2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2015.7309682