TY - JOUR A1 - Steffen, Jonas A1 - Lengsfeld, Sebastian A1 - Jung, Marco A1 - Ponick, Bernd A1 - Herranz Gracia, Mercedes A1 - Spagnolo, Aristide A1 - Klöpzig, Markus A1 - Schleicher, Klaus A1 - Schäfer, Klaus T1 - Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems JF - Energies N2 - 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. Y1 - 2021 U6 - https://doi.org/10.3390/en14113106 SN - 1996-1073 VL - 14 IS - 11 ER - TY - CHAP A1 - Jonas, Steffen A1 - Lengsfeld, Sebastian A1 - Jung, Marco A1 - Ponick, Bernd A1 - Herranz Gracia, Mercedes A1 - Spagnolo, Aristide A1 - Schleicher, Klaus, A1 - Schäfer, Klaus T1 - Design of a Medium Voltage Generator and Power Converter for High Power Wind Energy Conversion Systems T2 - 2020 55th International Universities Power Engineering Conference (UPEC) Y1 - 2020 U6 - https://doi.org/10.1109/UPEC49904.2020.9209886 SP - 1 EP - 5 ER -