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Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems

Author

Listed:
  • Jonas Steffen

    (Department Converters and Drive Technology, Fraunhofer Institute for Energy Economics and Energy System Technology, 34119 Kassel, Germany
    These authors contributed equally to this work.)

  • Sebastian Lengsfeld

    (Department Converters and Drive Technology, Fraunhofer Institute for Energy Economics and Energy System Technology, 34119 Kassel, Germany
    These authors contributed equally to this work.)

  • Marco Jung

    (Department Converters and Drive Technology, Fraunhofer Institute for Energy Economics and Energy System Technology, 34119 Kassel, Germany
    Institute of Technology, Resource and Energy-Efficient Engineering, Bonn-Rhein-Sieg University of Applied Sciences, 53757 Sankt Augustin, Germany)

  • Bernd Ponick

    (Institute for Drive Systems and Power Electronics, Leibniz University Hannover, 30167 Hannover, Germany)

  • Mercedes Herranz Gracia

    (Corporate Technology, Siemens AG, 91058 Erlangen, Germany)

  • Aristide Spagnolo

    (Corporate Technology, Siemens AG, 91058 Erlangen, Germany)

  • Markus Klöpzig

    (Corporate Technology, Siemens AG, 91058 Erlangen, Germany)

  • Klaus Schleicher

    (Corporate Technology, Siemens AG, 91058 Erlangen, Germany)

  • Klaus Schäfer

    (Flender GmbH, Vogelweiherstr. 1-15, 90441 Nürnberg, Germany)

Abstract

This paper shows a new concept to generate medium voltage (MV) in wind power application to avoid an additional transformer. Therefore, the generator must be redesigned with additional constraints and a new topology for the power rectifier system by using multiple low voltage (LV) power rectifiers connected in series and parallel to increase the DC output voltage. The combination of parallel and series connection of rectifiers is further introduced as DC-cascade. With the resulting DC-cascade, medium output voltage is achieved with low voltage rectifiers and without a bulky transformer. This approach to form a DC-cascade reduces the effort required to achieve medium DC voltage with a simple rectifier system. In this context, a suitable DC-cascade control was presented and verified with a laboratory test setup. A gearless synchronous generator, which is highly segmented so that each segment can be connected to its own power rectifier, is investigated. Due to the mixed AC and DC voltage given by the DC-cascade structure, it becomes more demanding to the design of the generator insulation, which influences the copper fill factor and the design of the cooling system. A design strategy for the overall generator design is carried out considering the new boundary conditions.

Suggested Citation

  • Jonas Steffen & Sebastian Lengsfeld & Marco Jung & Bernd Ponick & Mercedes Herranz Gracia & Aristide Spagnolo & Markus Klöpzig & Klaus Schleicher & Klaus Schäfer, 2021. "Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems," Energies, MDPI, vol. 14(11), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3106-:d:562780
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    References listed on IDEAS

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    1. Klemen Drobnič & Lovrenc Gašparin & Rastko Fišer, 2019. "Fast and Accurate Model of Interior Permanent-Magnet Machine for Dynamic Characterization," Energies, MDPI, vol. 12(5), pages 1-20, February.
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    Cited by:

    1. Gianfranco Chicco & Andrea Mazza & Salvatore Musumeci & Enrico Pons & Angela Russo, 2022. "Editorial for the Special Issue “Verifying the Targets—Selected Papers from the 55th International Universities Power Engineering Conference (UPEC 2020)”," Energies, MDPI, vol. 15(15), pages 1-8, August.
    2. Yuzhe Zhang & Xiaodong Liu & Haitao Li & Zhenbin Zhang, 2023. "A Model Independent Predictive Control of PMSG Wind Turbine Systems with a New Mechanism to Update Variables," Energies, MDPI, vol. 16(9), pages 1-15, April.
    3. Sebastian Lengsfeld & Sebastian Sprunck & Simon Robin Frank & Marco Jung & Marc Hiller & Bernd Ponick & Stefan Mersche, 2022. "An Approach to the Design and the Interactions of a Fully Superconducting Synchronous Generator and Its Power Converter," Energies, MDPI, vol. 15(10), pages 1-22, May.

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