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Mr. Jonas Steffen
Fraunhofer Institute for Energy Economics and Energy System Technology IEE, Kassel, Germany

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Research Keywords & Expertise

0 Power Converters
0 Power Electronics
0 Renewable Energy
0 Control of Electrical Machines
0 Control and Modelling of Power Converters

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Journal article
Published: 26 May 2021 in Energies
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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.

ACS Style

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 2021, 14, 3106 .

AMA Style

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. 2021; 14 (11):3106.

Chicago/Turabian Style

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 14, no. 11: 3106.

Conference paper
Published: 27 October 2016 in 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)
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A study of permanent magnet synchronous generator, constructed as a ring-generator, is presented in this paper. With this approach a milestone in reducing weight of wind turbines in high power applications like 10 MW generators can be reached. As proof-of-concept a scaled generator with a rated power of 200 kVA will be realized in a test bench. A distributed control and an active damping of axial mechanical vibrations approach is done. In order to achieve axial damping, the generator is divided in several electrical segments.

ACS Style

Axel Seibel; Cornelia Stubig; Matthias Wecker; Jonas Steffen; Kutralingam Kandasamy; Axel Mertens; Sebastian Nielebock. Distributed control of a multi-pole permanent magnet synchronous generator for wind turbine application. 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) 2016, 1 -10.

AMA Style

Axel Seibel, Cornelia Stubig, Matthias Wecker, Jonas Steffen, Kutralingam Kandasamy, Axel Mertens, Sebastian Nielebock. Distributed control of a multi-pole permanent magnet synchronous generator for wind turbine application. 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe). 2016; ():1-10.

Chicago/Turabian Style

Axel Seibel; Cornelia Stubig; Matthias Wecker; Jonas Steffen; Kutralingam Kandasamy; Axel Mertens; Sebastian Nielebock. 2016. "Distributed control of a multi-pole permanent magnet synchronous generator for wind turbine application." 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) , no. : 1-10.

Conference paper
Published: 01 September 2015 in 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)
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This paper proposes a novel control strategy for multiphase interleaved dc-dc converters for EV battery charging applications. The proposed control strategy allows to adapt the number of active phases and the switching frequency according to the output power. This strategy results to an increased partial load efficiency and current handling capability of the semiconductors while the size of the semiconductor, the magnetic components and the cooling system size is reduced. An experimental validation of the proposed method is presented.

ACS Style

Marco Jung; Georgios Lempidis; Daniel Holsch; Jonas Steffen. Optimization considerations for interleaved DC-DC converters for EV battery charging applications, in terms of partial load efficiency and power density. 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe) 2015, 1 -9.

AMA Style

Marco Jung, Georgios Lempidis, Daniel Holsch, Jonas Steffen. Optimization considerations for interleaved DC-DC converters for EV battery charging applications, in terms of partial load efficiency and power density. 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe). 2015; ():1-9.

Chicago/Turabian Style

Marco Jung; Georgios Lempidis; Daniel Holsch; Jonas Steffen. 2015. "Optimization considerations for interleaved DC-DC converters for EV battery charging applications, in terms of partial load efficiency and power density." 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe) , no. : 1-9.

Conference paper
Published: 01 September 2015 in 2015 IEEE Energy Conversion Congress and Exposition (ECCE)
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This paper deals with the optimization of the components of a multiphase interleaved operated buck converter for battery charging applications and proposes two control strategies. The proposed control strategies allow the number of active phases and the switching frequency to be adapted according to the output power, enabling a significant increase to the power handling capability without increasing the size of the power semiconductor. This can be further exploited to decrease the size of the semiconductor and the cooling system for a given power. In addition, the partial load efficiency of the converter is increased significantly. Finally an experimental validation is presented.

ACS Style

Marco Jung; Georgios Lempidis; Daniel Holsch; Jonas Steffen. Control and optimization strategies for interleaved dc-dc converters for EV battery charging applications. 2015 IEEE Energy Conversion Congress and Exposition (ECCE) 2015, 6022 -6028.

AMA Style

Marco Jung, Georgios Lempidis, Daniel Holsch, Jonas Steffen. Control and optimization strategies for interleaved dc-dc converters for EV battery charging applications. 2015 IEEE Energy Conversion Congress and Exposition (ECCE). 2015; ():6022-6028.

Chicago/Turabian Style

Marco Jung; Georgios Lempidis; Daniel Holsch; Jonas Steffen. 2015. "Control and optimization strategies for interleaved dc-dc converters for EV battery charging applications." 2015 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 6022-6028.