@article{SteffenLengsfeldJungetal., author = {Steffen, Jonas and Lengsfeld, Sebastian and Jung, Marco and Ponick, Bernd and Herranz Gracia, Mercedes and Spagnolo, Aristide and Kl{\"o}pzig, Markus and Schleicher, Klaus and Sch{\"a}fer, Klaus}, title = {Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems}, series = {Energies}, volume = {14}, journal = {Energies}, number = {11}, issn = {1996-1073}, doi = {10.3390/en14113106}, 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.}, language = {en} } @inproceedings{SchaeferHofmannBayeretal., author = {Sch{\"a}fer, Markus and Hofmann, Martin and Bayer, Fabian and M{\"u}ller, Bernhard and Ackva, Ansgar}, title = {Direct Current Control Method for Three-Phase Motor Drives}, series = {Ecological Vehicles and Renewable Energies (EVER), 2018 Thirteenth International Conference on}, booktitle = {Ecological Vehicles and Renewable Energies (EVER), 2018 Thirteenth International Conference on}, doi = {10.1109/EVER.2018.8362361}, pages = {1 -- 5}, language = {en} } @inproceedings{RaabPonomarovHofmannetal., author = {Raab, Sebastian and Ponomarov, Pavlo and Hofmann, Martin and Sch{\"a}fer, Markus and Ackva, Ansgar}, title = {Performance evaluations of load balancing in industrial power grids using vehicle to grid technology}, series = {Power Electronics and Applications (EPE'17 ECCE Europe), 2017 19th European Conference on}, booktitle = {Power Electronics and Applications (EPE'17 ECCE Europe), 2017 19th European Conference on}, isbn = {978-90-75815-27-6}, doi = {10.23919/EPE17ECCEEurope.2017.8098975}, pages = {1 -- 8}, language = {en} } @article{SchaeferGoetzeHofmannetal., author = {Sch{\"a}fer, Markus and Goetze, Wolf and Hofmann, Martin and Bayer, Fabian and Montesinos Miracle, Daniel and Ackva, Ansgar}, title = {Direct current control for grid connected diode-clamped inverters}, series = {IEEE transactions on industrial electronics}, volume = {64}, journal = {IEEE transactions on industrial electronics}, number = {4}, issn = {0278-0046}, doi = {10.1109/TIE.2016.2636127}, pages = {3067 -- 3074}, language = {en} } @inproceedings{HofmannRaabSchaeferetal., author = {Hofmann, Martin and Raab, Sebastian and Sch{\"a}fer, Markus and Ponomarov, Pavlo and Ackva, Ansgar}, title = {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}, series = {Power Electronics for Distributed Generation Systems (PEDG), 2015 IEEE 6th International Symposium on}, booktitle = {Power Electronics for Distributed Generation Systems (PEDG), 2015 IEEE 6th International Symposium on}, isbn = {978-1-4799-8586-9}, doi = {10.1109/PEDG.2015.7223022}, pages = {1 -- 5}, language = {en} } @article{SchaeferGoetzeHofmannetal., author = {Sch{\"a}fer, Markus and Goetze, Wolf and Hofmann, Martin and Montesinos Miracle, Daniel and Ackva, Ansgar}, title = {Three phase transformation for simplified space vector control of multilevel inverters}, series = {Control and Modeling for Power Electronics (COMPEL), 2015 IEEE 16th Workshop on}, journal = {Control and Modeling for Power Electronics (COMPEL), 2015 IEEE 16th Workshop on}, isbn = {978-1-4673-6847-6}, doi = {10.1109/COMPEL.2015.7236453}, pages = {1 -- 7}, language = {en} } @inproceedings{HofmannSchaeferAckva, author = {Hofmann, Martin and Sch{\"a}fer, Markus and Ackva, Ansgar}, title = {Grid voltage-sensorless control of direct current controlled multilevel converters}, series = {Power Electronics and Applications (EPE'17 ECCE Europe), 2017 19th European Conference on}, booktitle = {Power Electronics and Applications (EPE'17 ECCE Europe), 2017 19th European Conference on}, isbn = {978-90-75815-27-6}, doi = {10.23919/EPE17ECCEEurope.2017.8099323}, pages = {1 -- 8}, language = {en} } @inproceedings{HofmannSchaeferAckva, author = {Hofmann, Martin and Sch{\"a}fer, Markus and Ackva, Ansgar}, title = {Bi-directional charging system for electric vehicles: A V2G concept for charging and discharging electric vehicles}, series = {Electric Drives Production Conference (EDPC), 2014 4th International}, booktitle = {Electric Drives Production Conference (EDPC), 2014 4th International}, isbn = {978-1-4799-5009-6}, doi = {10.1109/EDPC.2014.6984434}, pages = {1 -- 5}, language = {en} } @inproceedings{SchaeferHofmannRaabetal., author = {Sch{\"a}fer, Markus and Hofmann, Martin and Raab, Sebastian and Ackva, Ansgar}, title = {Multilevel direct current control for grid-connected inverters}, series = {Power Electronics and Applications (EPE'15 ECCE-Europe), 2015 17th European Conference on}, booktitle = {Power Electronics and Applications (EPE'15 ECCE-Europe), 2015 17th European Conference on}, isbn = {978-9-0758-1522-1}, doi = {10.1109/EPE.2015.7309127}, pages = {1 -- 7}, language = {en} } @inproceedings{HofmannSchaeferAckva, author = {Hofmann, Martin and Sch{\"a}fer, Markus and Ackva, Ansgar}, title = {Optimization of direct current controlled multilevel inverters under distorted conditions}, series = {Power Electronics and Applications (EPE'16 ECCE Europe), 2016 18th European Conference on}, booktitle = {Power Electronics and Applications (EPE'16 ECCE Europe), 2016 18th European Conference on}, isbn = {978-9-0758-1524-5}, doi = {10.1109/EPE.2016.7695456}, pages = {1 -- 7}, language = {en} } @inproceedings{SchaeferHofmannRaabetal., author = {Sch{\"a}fer, Markus and Hofmann, Martin and Raab, Sebastian and Ackva, Ansgar}, title = {FPGA Based Control of an Three Level Neutral Point Clamped Inverter}, series = {PCIM Europe 2017; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management; Proceedings of}, booktitle = {PCIM Europe 2017; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management; Proceedings of}, editor = {PCIM GmbH, Mesago}, isbn = {978-3-8007-4424-4}, pages = {1558 -- 1563}, language = {en} } @article{HofmannSchaeferMontesinosMiracleetal., author = {Hofmann, Martin and Sch{\"a}fer, Markus and Montesinos Miracle, Daniel and Ackva, Ansgar}, title = {Improved Direct Current Control for Grid Connected Multilevel Inverters}, series = {IEEE transactions on industrial electronics}, journal = {IEEE transactions on industrial electronics}, issn = {0278-0046}, doi = {10.1109/TIE.2020.3018055}, pages = {1 -- 1}, language = {en} }