Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems
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 c...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/11/3106 |
| _version_ | 1827691458291826688 |
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| author | Jonas Steffen Sebastian Lengsfeld Marco Jung Bernd Ponick Mercedes Herranz Gracia Aristide Spagnolo Markus Klöpzig Klaus Schleicher Klaus Schäfer |
| author_facet | Jonas Steffen Sebastian Lengsfeld Marco Jung Bernd Ponick Mercedes Herranz Gracia Aristide Spagnolo Markus Klöpzig Klaus Schleicher Klaus Schäfer |
| author_sort | Jonas Steffen |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T11:01:58Z |
| format | Article |
| id | doaj.art-f1af5c7a71414866a92b9d82532fe402 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T11:01:58Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-f1af5c7a71414866a92b9d82532fe4022023-11-21T21:30:07ZengMDPI AGEnergies1996-10732021-05-011411310610.3390/en14113106Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion SystemsJonas Steffen0Sebastian Lengsfeld1Marco Jung2Bernd Ponick3Mercedes Herranz Gracia4Aristide Spagnolo5Markus Klöpzig6Klaus Schleicher7Klaus Schäfer8Department Converters and Drive Technology, Fraunhofer Institute for Energy Economics and Energy System Technology, 34119 Kassel, GermanyDepartment Converters and Drive Technology, Fraunhofer Institute for Energy Economics and Energy System Technology, 34119 Kassel, GermanyDepartment Converters and Drive Technology, Fraunhofer Institute for Energy Economics and Energy System Technology, 34119 Kassel, GermanyInstitute for Drive Systems and Power Electronics, Leibniz University Hannover, 30167 Hannover, GermanyCorporate Technology, Siemens AG, 91058 Erlangen, GermanyCorporate Technology, Siemens AG, 91058 Erlangen, GermanyCorporate Technology, Siemens AG, 91058 Erlangen, GermanyCorporate Technology, Siemens AG, 91058 Erlangen, GermanyFlender GmbH, Vogelweiherstr. 1-15, 90441 Nürnberg, GermanyThis 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.https://www.mdpi.com/1996-1073/14/11/3106wind energy conversion systems (WECS)permanent magnet synchronous generator (PMSG)DC-cascadepower rectifiermedium voltage insulation |
| spellingShingle | Jonas Steffen Sebastian Lengsfeld Marco Jung Bernd Ponick Mercedes Herranz Gracia Aristide Spagnolo Markus Klöpzig Klaus Schleicher Klaus Schäfer Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems Energies wind energy conversion systems (WECS) permanent magnet synchronous generator (PMSG) DC-cascade power rectifier medium voltage insulation |
| title | Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems |
| title_full | Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems |
| title_fullStr | Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems |
| title_full_unstemmed | Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems |
| title_short | Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems |
| title_sort | design of a medium voltage generator with dc cascade for high power wind energy conversion systems |
| topic | wind energy conversion systems (WECS) permanent magnet synchronous generator (PMSG) DC-cascade power rectifier medium voltage insulation |
| url | https://www.mdpi.com/1996-1073/14/11/3106 |
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