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    <title language="eng">Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems</title>
    <abstract language="eng">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.</abstract>
    <parentTitle language="eng">Energies</parentTitle>
    <identifier type="issn">1996-1073</identifier>
    <identifier type="doi">10.3390/en14113106</identifier>
    <enrichment key="opus.import.data">@Articleen14113106, AUTHOR = Steffen, Jonas and Lengsfeld, Sebastian and Jung, Marco and Ponick, Bernd and Herranz Gracia, Mercedes and Spagnolo, Aristide and Klöpzig, Markus and Schleicher, Klaus and Schäfer, Klaus, TITLE = Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems, JOURNAL = Energies, VOLUME = 14, YEAR = 2021, NUMBER = 11, ARTICLE-NUMBER = 3106, URL = https://www.mdpi.com/1996-1073/14/11/3106, ISSN = 1996-1073, 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., DOI = 10.3390/en14113106</enrichment>
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    <author>Jonas Steffen</author>
    <author>Sebastian Lengsfeld</author>
    <author>Marco Jung</author>
    <author>Bernd Ponick</author>
    <author>Mercedes Herranz Gracia</author>
    <author>Aristide Spagnolo</author>
    <author>Markus Klöpzig</author>
    <author>Klaus Schleicher</author>
    <author>Klaus Schäfer</author>
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    <title language="eng">Design of a Medium Voltage Generator and Power Converter for High Power Wind Energy Conversion Systems</title>
    <parentTitle language="eng">2020 55th International Universities Power Engineering Conference (UPEC)</parentTitle>
    <identifier type="doi">10.1109/UPEC49904.2020.9209886</identifier>
    <enrichment key="opus.import.data">@INPROCEEDINGS9209886, author=Jonas, Steffen and Lengsfeld, Sebastian and Jung, Marco and Ponick, Bernd and Herranz Gracia, Mercedes and Spagnolo, Aristide and Schleicher, Klaus, and Schäfer, Klaus, booktitle=2020 55th International Universities Power Engineering Conference (UPEC), title=Design of a Medium Voltage Generator and Power Converter for High Power Wind Energy Conversion Systems, year=2020, volume=, number=, pages=1-5, doi=10.1109/UPEC49904.2020.9209886</enrichment>
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    <author>Steffen Jonas</author>
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    <author>Mercedes Herranz Gracia</author>
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