Transformer Optimisation of the Integrated AC/DC–DC/AC Bidirectional Converter for Vehicle to Grid Interfacing

Ashot Melkonyan, Jiabin Wang, Kai Kriegel, Khoa Dang Hoang, Roman Nestlinger

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

For a Vehicle to Grid (V2G) interfacing an integrated AC/DC-DC/AC bi-directional converter is presented in this paper. It is realised as a combination of 2.5 kW DC-AC grid inverter and bidirectional Dual Active Bridge (DAB) dc-dc converter for battery charging and for feeding the electric energy stored the battery back into the grid. For the target micro-sized electrical cars, the main challenge is the realization of a light-weight power converter. Particularly the high frequency power transformer design optimization and high frequency effects like skin and proximity losses in the transformer windings are analysed in details. Based on finite element method (FEM) numerical simulation as well as on analytical approach the stranding level proximity losses in a Litzwire are estimated and an optimal number of the Litzwire strands as well as their diameter are determined for minimum losses in a given transformer. The resulting high efficiency bi-directional DAB converter with optimised transformer for Electrical Vehicle battery charging and grid interfacing system is implemented in a prototype design.

Original languageEnglish
Title of host publicationProceedings - PCIM Europe 2013
Subtitle of host publicationInternational Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
PublisherMesago PCIM GmbH
Pages428-437
Number of pages10
Volume1
ISBN (Print)9783800735051, 9781629933085
Publication statusPublished - 14 May 2013
Externally publishedYes
EventInternational Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Europe 2013 - Nuremberg, Germany
Duration: 14 May 201316 May 2013

Publication series

NamePCIM Europe Conference Proceedings
PublisherMesago Messe Frankfurt GmbH
Volume1
ISSN (Electronic)2191-3358

Conference

ConferenceInternational Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Europe 2013
CountryGermany
CityNuremberg
Period14/05/1316/05/13

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