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 - Schäfer, Markus A1 - Hofmann, Martin A1 - Bayer, Fabian A1 - Müller, Bernhard A1 - Ackva, Ansgar T1 - Direct Current Control Method for Three-Phase Motor Drives T2 - Ecological Vehicles and Renewable Energies (EVER), 2018 Thirteenth International Conference on Y1 - 2018 U6 - https://doi.org/10.1109/EVER.2018.8362361 SP - 1 EP - 5 ER - TY - CHAP A1 - Raab, Sebastian A1 - Ponomarov, Pavlo A1 - Hofmann, Martin A1 - Schäfer, Markus A1 - Ackva, Ansgar T1 - Performance evaluations of load balancing in industrial power grids using vehicle to grid technology T2 - Power Electronics and Applications (EPE’17 ECCE Europe), 2017 19th European Conference on Y1 - 2017 SN - 978-90-75815-27-6 U6 - https://doi.org/10.23919/EPE17ECCEEurope.2017.8098975 SP - 1 EP - 8 ER - TY - JOUR A1 - Schäfer, Markus A1 - Goetze, Wolf A1 - Hofmann, Martin A1 - Bayer, Fabian A1 - Montesinos Miracle, Daniel A1 - Ackva, Ansgar T1 - Direct current control for grid connected diode-clamped inverters JF - IEEE transactions on industrial electronics Y1 - 2017 U6 - https://doi.org/10.1109/TIE.2016.2636127 SN - 0278-0046 VL - 64 IS - 4 SP - 3067 EP - 3074 ER - TY - CHAP A1 - Hofmann, Martin A1 - Raab, Sebastian A1 - Schäfer, Markus A1 - Ponomarov, Pavlo A1 - Ackva, Ansgar T1 - Measurements on vehicle to grid application in industrial power grid for peak load reduction: Robust bidirectional charger for series production electric and plug-in hybrid vehicles T2 - Power Electronics for Distributed Generation Systems (PEDG), 2015 IEEE 6th International Symposium on KW - Leistungselektronik;Netzstromrichter Y1 - 2015 SN - 978-1-4799-8586-9 U6 - https://doi.org/10.1109/PEDG.2015.7223022 SP - 1 EP - 5 ER - TY - JOUR A1 - Schäfer, Markus A1 - Goetze, Wolf A1 - Hofmann, Martin A1 - Montesinos Miracle, Daniel A1 - Ackva, Ansgar T1 - Three phase transformation for simplified space vector control of multilevel inverters JF - Control and Modeling for Power Electronics (COMPEL), 2015 IEEE 16th Workshop on Y1 - 2015 SN - 978-1-4673-6847-6 U6 - https://doi.org/10.1109/COMPEL.2015.7236453 SP - 1 EP - 7 ER - TY - CHAP A1 - Hofmann, Martin A1 - Schäfer, Markus A1 - Ackva, Ansgar T1 - Grid voltage-sensorless control of direct current controlled multilevel converters T2 - Power Electronics and Applications (EPE’17 ECCE Europe), 2017 19th European Conference on Y1 - 2017 SN - 978-90-75815-27-6 U6 - https://doi.org/10.23919/EPE17ECCEEurope.2017.8099323 SP - 1 EP - 8 ER - TY - CHAP A1 - Hofmann, Martin A1 - Schäfer, Markus A1 - Ackva, Ansgar T1 - Bi-directional charging system for electric vehicles: A V2G concept for charging and discharging electric vehicles T2 - Electric Drives Production Conference (EDPC), 2014 4th International Y1 - 2014 SN - 978-1-4799-5009-6 U6 - https://doi.org/10.1109/EDPC.2014.6984434 SP - 1 EP - 5 ER - TY - CHAP A1 - Schäfer, Markus A1 - Hofmann, Martin A1 - Raab, Sebastian A1 - Ackva, Ansgar T1 - Multilevel direct current control for grid-connected inverters T2 - Power Electronics and Applications (EPE’15 ECCE-Europe), 2015 17th European Conference on Y1 - 2015 SN - 978-9-0758-1522-1 U6 - https://doi.org/10.1109/EPE.2015.7309127 SP - 1 EP - 7 ER - TY - CHAP A1 - Hofmann, Martin A1 - Schäfer, Markus A1 - Ackva, Ansgar T1 - Optimization of direct current controlled multilevel inverters under distorted conditions T2 - Power Electronics and Applications (EPE’16 ECCE Europe), 2016 18th European Conference on Y1 - 2016 SN - 978-9-0758-1524-5 U6 - https://doi.org/10.1109/EPE.2016.7695456 SP - 1 EP - 7 ER - TY - CHAP A1 - Schäfer, Markus A1 - Hofmann, Martin A1 - Raab, Sebastian A1 - Ackva, Ansgar ED - PCIM GmbH, Mesago T1 - FPGA Based Control of an Three Level Neutral Point Clamped Inverter T2 - PCIM Europe 2017; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management; Proceedings of Y1 - 2017 SN - 978-3-8007-4424-4 SP - 1558 EP - 1563 ER - TY - JOUR A1 - Hofmann, Martin A1 - Schäfer, Markus A1 - Montesinos Miracle, Daniel A1 - Ackva, Ansgar T1 - Improved Direct Current Control for Grid Connected Multilevel Inverters JF - IEEE transactions on industrial electronics Y1 - 2020 U6 - https://doi.org/10.1109/TIE.2020.3018055 SN - 0278-0046 SP - 1 EP - 1 ER -