Isolated DC/DC Multimode Converter with Energy Storage Integration for Charging Stations

Hoffmann, Felix; Pereira, Thiago; Liserre, Marco

doi:10.1109/ecce44975.2020.9235471

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…Since the proposed battery design does not require a DC-DC converter for controlling the EV charging process, the additional losses caused by the MOSFETs can be compared against the saved converter losses. The achieved efficiency of DC-DC converters used in fast charging stations lies around 96-98% [32,33]. Hence, the proposed system has a competitive efficiency compared to a battery buffered fast charging station with power converter.…”

Section: Discussionmentioning

confidence: 98%

Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles

et al. 2021

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This paper introduces a novel design of an electric vehicle (EV) fast charging station, consisting of a battery energy storage system (BESS) with reconfigurable cell topology. The BESS comprises two battery strings that decouple the power flow between EV and grid, to enable charging powers above the grid capacity. The reconfigurable design is achieved by equipping the battery cells with semiconductor switches and serves two main purposes. First, it aims at solving cell unbalance issues to increase safety, reliability, and lifetime of the battery. Second, it enables the BESS to actively control the EV charging process by changing its cell configuration in a real-time fashion, making a DC-DC converter redundant. The paper presents a modelling approach that captures the reconfigurable design including the controlling algorithm used for cell engagement. The simulation results show that the BESS is able to fulfil the EV request with sufficient accuracy for most of the fast charging process. However, the switching of cells leads to variations in the charging current that can potentially exceed the tolerance band defined in IEC61851-23. Therefore, complementary measures are suggested to achieve a suitable current control during all phases of the charging process. The estimated BESS efficiency during the EV fast charging process is 93.3%. The losses caused by the reconfigurable design amount to 1.2% of the provided energy. It is demonstrated that the proposed design has a competitive efficiency compared to a battery buffered fast charging station with DC-DC converter.

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Section: Discussionmentioning

confidence: 98%

Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles

et al. 2021

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“…Finally, hybrid/passive topologies can also be used to implement the cells for reducing the volume trough the elimination of inherent auxiliary circuits, cf. Figure 10 (g)-(i) [26].…”

Section: Design Considerations Of the Insulated Cellmentioning

confidence: 99%

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

Pereira

Hoffmann

Zhu

et al. 2021

IEEE Trans. Power Electron.

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Multiwinding-Transfomer-based (MTB) DC-DC converter did emerge in the last 25 years as an interesting possibility to connect several energy systems and/or to offer higher power density because of the reduction of transformer core material and reduction of power converter stages. MTB DC-DC converters can be considered as an interesting compromise between non-modular and a modular DC-DC converter since they are themselves modular in the construction. This eventually leads to some fault-tolerant possibilities since the multiwinding transformer (MWT) connects multiples ports and if one of them is not working anymore and it can be isolated, the others might still continue operating. Unfortunately, it is exactly the MWT that creates most of the technical challenges of this class of DC-DC converters because of the cross-coupling effects among the cells which make especially the resonant-topology very challenging to be designed. This paper reviews the history of the MTB DC-DC and then provides a classification of them, comparing them with Figure of Merits (FOM) and focusing on which is the maximum possible number of windings and which are the most suited magnetic core types. The problems coming from cross-coupling and the possible fault-tolerant operation are analysed with the help of simulation and experimental results.

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“…The multi-terminal dc/dc converter is a different topology choice, which can provide more connectivity, e.g., electrical vehicle charging station and storage, was proposed in [76], as shown in Fig. 14.…”

Section: The Building Blocks Of the Renewable Energy Systemsmentioning

confidence: 99%

The Role of Renewable Energy System in Reshaping the Electrical Grid Scenario

Buticchi

Lam

Ruan

et al. 2021

IEEE Open J. Ind. Electron. Soc.

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Renewable Energy Systems have been in the spotlight of the academic and industrial research for more than two decades, thanks to the development of several fields related to the Electrical Engineering. More recently, with the increasing complexity of the individual renewable energy systems and the interconnection to the grid, the scientific panorama has been witnessing to a convergence of different topics, which span across several IEEE-IES thematic areas: power electronics, electrical machines, smart grids, energy storage, transportation electrification and aerospace. After a brief overview of the renewable energy technologies, this work deals with how the convergence of multiple technologies developed to provide marginal support to the grid has evolved into the foundation of the future utility grid and expanded to transportation sector. It will be shown how the design of a renewable energy system cannot prescind anymore from the electrical grid and from the ancillary services that are requested. Example of convergence are given for a smart transformer application and for a transportation application.

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Isolated DC/DC Multimode Converter with Energy Storage Integration for Charging Stations

Cited by 7 publications

References 14 publications

Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles

Double-String Battery System with Reconfigurable Cell Topology Operated as a Fast Charging Station for Electric Vehicles

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

The Role of Renewable Energy System in Reshaping the Electrical Grid Scenario

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