Optimal Design of DC Fast-Charging Stations for EVs in Low Voltage Grids

Marjan Gjelaj, Chresten Træholt, Seyedmostafa Hashemi Toghroljerdi, Peter Bach Andersen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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    DC Fast Charging Station (DCFCS) is essential for widespread use of Electric Vehicle (EVs). It can recharge EVs in direct current in a short period of time. In recent years, the increasing penetration of EVs and their charging systems are going through a series of changes. This paper addresses the design of a new DCFCS for EVs coupled with a local Battery Energy Storage (BES). DCFCS is equipped with a bidirectional AC/DC converter for feeding power back to the grid, two lithium batteries
    and a DC/DC converter. This paper proposes an optimal size of the BES to reduce the negative impacts on the power grid through the application of electrical storage systems within the DC fast charging stations. The proposed solution decreases the charging time and the impact on the low voltage (LV) grid significantly. The charger can be used as a multifunctional grid-utility such as congestion management and load levelling. Finally, an optimal design of the DCFSC has been done to evaluate the feasibility and the operability of the system in different EVs load conditions.
    Original languageEnglish
    Title of host publicationProceedings of 2017 IEEE Transportation Electrification Conference
    Publication date2017
    ISBN (Print)9781509039531
    Publication statusPublished - 2017
    Event2017 IEEE Transportation Electrification Conference and Expo - Chicago, United States
    Duration: 22 Jun 201724 Jun 2017


    Conference2017 IEEE Transportation Electrification Conference and Expo
    Country/TerritoryUnited States
    Internet address


    • DC fast charging station
    • Battery energy storage
    • Electric vehicle


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