Dual two-stage isolated bidirectional DC-DC converter for DC grid storage

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Abstract

One of the trends for low-voltage dc grids is the use of a two-line dc distribution in order to facilitate the interface to present-time ac grids, and also to allow the flexible use of diverse loads. Another feature of such dc grids is the distributed storage elements in houses and buildings. This storage system needs an isolated power converter to interface battery and grid. This paper presents the analysis, design and experimental validation of a 30 kW two-stage dual converter, interfacing a ±350 Vdc or battery ±380 Vdc grid and a bank. The first stage consists of a non-isolated synchronous Boost converter with current control. Whereas the second stage is an isolated bidirectional C3LC converter providing same static characteristics in both ways of energy transfer.

Original languageEnglish
Title of host publication2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
Subtitle of host publicationThe International Power Electronics Conference , Niigata (JPN), 20-24 May2018
PublisherInstitute of Electrical and Electronics Engineers
Pages1447-1454
Number of pages8
ISBN (Electronic)9784886864055
DOIs
Publication statusPublished - 22 Oct 2018
Event8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018 - Niigata, Japan
Duration: 20 May 201824 May 2018

Conference

Conference8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
Country/TerritoryJapan
CityNiigata
Period20/05/1824/05/18

Keywords

  • Bidirectional DC-DC converter
  • dc microgrids
  • energy storage
  • LLC converter

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