@article{OeserZieglerAckva, author = {Oeser, David and Ziegler, Andreas and Ackva, Ansgar}, title = {Single cell analysis of lithium-ion e-bike batteries aged under various conditions}, series = {Journal of power sources}, volume = {397}, journal = {Journal of power sources}, issn = {0378-7753}, doi = {10.1016/j.jpowsour.2018.06.101}, pages = {25 -- 31}, language = {en} } @article{AckvaDresselEndres2013, author = {Ackva, Ansgar and Dreßel, Bernd and Endres, Julian}, title = {Umrichter in Hybridstruktur als Entwicklungswerkzeug und Pr{\"u}fsystem f{\"u}r elektrische Antriebe}, series = {FHWS Science Journal}, volume = {1}, journal = {FHWS Science Journal}, number = {2}, address = {W{\"u}rzburg}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-484}, pages = {25 -- 36}, year = {2013}, abstract = {Die Entwicklung, Applikation und der Test von Wechselrichtern, insbesondere f{\"u}r Traktionsantriebe, ist mit einem hohen Aufwand f{\"u}r die Bereitstellung einer passenden Testumgebung verbunden. F{\"u}r gew{\"o}hnlich werden diese Tests in der Entwicklung als auch in der Fertigung mit Hilfe von Motor-Generator Pr{\"u}fst{\"a}nden durchgef{\"u}hrt, die wiederum f{\"u}r unterschiedliche Leistungsklassen vorgehalten werden m{\"u}ssen. In diesem Beitrag wird eine neuartige hochdynamische Umrichtertopologie vorgestellt, die als universelles Entwicklungs-, Applikations- und Pr{\"u}fsystem f{\"u}r Umrichter eingesetzt werden kann. Derzeit wird dieser Umrichter in Hybridstruktur im Rahmen eines Forschungsprojektes an der FHWS realisiert.}, language = {de} } @article{WolzKempkesAckvaetal.2013, author = {Wolz, Christoph and Kempkes, Joachim and Ackva, Ansgar and Sch{\"a}fer, Uwe}, title = {Nichtlineare Berechnung von permanentmagneterregten Gleichstrommotoren mit konzentrierten Wicklungen}, series = {FHWS Science Journal}, volume = {1}, journal = {FHWS Science Journal}, number = {2}, address = {W{\"u}rzburg}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-457}, pages = {89 -- 98}, year = {2013}, abstract = {Steigende Anforderungen an Hilfsantriebe im Automotive-Bereich verlangen im Hinblick auf Energie- und Kosteneffizienz innovative Berechnungsmethoden des magnetischen Kreises. Der magnetische Kreis moderner Permanentmagnet-Gleichstrommotoren kleiner Leistung weist ein signifikantes S{\"a}ttigungsverhalten auf. Er ist derart ausgelegt, dass die von den Permanentmagneten erzeugten magnetischen Feldst{\"a}rken nicht wie {\"u}blich dominieren, sondern die bestromten Ankerspulen vergleichbare Feldst{\"a}rken erzeugen. Lineare Berechnungen mit konstanten Permeabilit{\"a}ten bzw. Induktivit{\"a}ten f{\"u}hren zu nicht mehr akzeptablen Ungenauigkeiten. Mittels transienter FEM-Simulationen ist es m{\"o}glich die jeweiligen Fl{\"u}sse in den Zahnspulen in Abh{\"a}ngigkeit von der Ankerposition und den Spulenstr{\"o}men zu bestimmen. F{\"u}r kurze Motorl{\"a}ngen sind grunds{\"a}tzlich 3D-FEM-Berechnungen n{\"o}tig. Es wurde ein Modellansatz gefunden, mit dem der Einsatz von 3D-FEM-Rechnungen stark reduziert und die {\"U}berlagerung der Fl{\"u}sse in jedem Zahn zuverl{\"a}ssig und schnell beschrieben werden k{\"o}nnen. Dadurch kann die Rechen- und Entwicklungszeit erheblich reduziert werden.}, language = {de} } @article{BayerSchreibmannAckvaetal., author = {Bayer, Sven and Schreibmann, Vitaliy and Ackva, Ansgar and Balzer, Arndt and Braun, Peter}, title = {PedElEc: Towards a Better Understanding of Ageing Processes of E-Bike Batteries}, series = {Applied mechanics and materials}, volume = {848}, journal = {Applied mechanics and materials}, issn = {1662-7482}, doi = {10.4028/www.scientific.net/AMM.848.119}, pages = {119 -- 122}, language = {en} } @incollection{AckvaDresselEndres, author = {Ackva, Ansgar and Dreßel, Bernd and Endres, Julian}, title = {Umrichter in Hybridstruktur als Entwicklungswerkzeug und Pr{\"u}fsystem f{\"u}r elektrische Antriebe}, series = {Elektrische Antriebstechnologie f{\"u}r Hybrid- und Elektrofahrzeuge}, booktitle = {Elektrische Antriebstechnologie f{\"u}r Hybrid- und Elektrofahrzeuge}, editor = {Sch{\"a}fer, Heinz}, isbn = {978-3-8169-3239-0}, pages = {431 -- 443}, language = {en} } @article{AckvaHueckmannMolchanov, author = {Ackva, Ansgar and H{\"u}ckmann, Benjamin and Molchanov, Oleksii}, title = {Chancen und Grenzen von Active Balancing f{\"u}r Batteriemodule}, series = {EMobile plus solar}, volume = {95}, journal = {EMobile plus solar}, number = {3}, issn = {1869-957X}, language = {en} } @article{ZieglerOeserHeinetal., author = {Ziegler, Andreas and Oeser, David and Hein, Thiemo and Montesinos Miracle, Daniel and Ackva, Ansgar}, title = {Run to Failure: Aging of Commercial Battery Cells beyond Their End of Life}, series = {Energies}, volume = {13}, journal = {Energies}, number = {8}, doi = {10.3390/en13081858}, 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} } @article{RaabKraemerAckva, author = {Raab, Sebastian and Kr{\"a}mer, Andreas and Ackva, Ansgar}, title = {Determination of RMS Current Load on the DC-Link Capacitor of Voltage Source Converters Using Direct Current Control}, series = {IEEE transactions on power electronics}, volume = {36}, journal = {IEEE transactions on power electronics}, number = {1}, issn = {0885-8993}, doi = {10.1109/TPEL.2020.3000243}, pages = {968 -- 977}, language = {en} } @article{BohnBayerStolzetal., author = {Bohn, Gunther and Bayer, Sven and Stolz, M. and Ackva, Ansgar and Arndt, Bernhard}, title = {Lifetime Simulation of Rechargeable Batteries for Solar Powered Fishing Lights}, series = {Applied mechanics and materials}, volume = {848}, journal = {Applied mechanics and materials}, issn = {1662-7482}, doi = {10.4028/www.scientific.net/AMM.848.115}, pages = {115 -- 118}, language = {en} } @article{EndresBayerLinkeetal., author = {Endres, Julian and Bayer, Fabian and Linke, Andreas and Ackva, Ansgar}, title = {Modular Real-Time Development Platform for Power Electronic Systems}, series = {Bodo's power systems}, journal = {Bodo's power systems}, number = {7}, issn = {1863-5598}, pages = {58 -- 60}, 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} } @article{HeinZieglerOeseretal., author = {Hein, Thiemo and Ziegler, Andreas and Oeser, David and Ackva, Ansgar}, title = {A capacity-based equalization method for aged lithium-ion batteries in electric vehicles}, series = {Electric power systems research}, volume = {191}, journal = {Electric power systems research}, issn = {0378-7796}, doi = {10.1016/j.epsr.2020.106898}, language = {en} } @article{ZieglerOeserHeinetal., author = {Ziegler, Andreas and Oeser, David and Hein, Thiemo and Montesinos Miracle, Daniel and Ackva, Ansgar}, title = {Reducing Cell to Cell Variation of Lithium-Ion Battery Packs During Operation}, volume = {9}, doi = {10.1109/ACCESS.2021.3057125}, pages = {24994 -- 25001}, language = {en} } @incollection{KempkesWolzAckvaetal., author = {Kempkes, Joachim and Wolz, Christoph and Ackva, Ansgar and Sch{\"a}fer, Uwe}, title = {Nichtlineare Berechnung von permanentmagneterregten Gleichstrommotoren mit konzentrierten Wicklungen}, series = {Vortr{\"a}ge der 4. VDE/VDI-Tagung vom 17. bis 18. September 2013 in N{\"u}rtingen}, booktitle = {Vortr{\"a}ge der 4. VDE/VDI-Tagung vom 17. bis 18. September 2013 in N{\"u}rtingen}, publisher = {VDE}, address = {Berlin}, language = {de} } @inproceedings{ZieglerOeserArndtetal., author = {Ziegler, Andreas and Oeser, David and Arndt, Bernhard and Ackva, Ansgar}, title = {A Universal, Modular and Bidirectional Active Balancing System for Lithium-Ion Cells}, series = {Proceedings of the 10th International Scientific Symposium on Electrical Power Engineering}, booktitle = {Proceedings of the 10th International Scientific Symposium on Electrical Power Engineering}, editor = {University of Košice, Technical}, isbn = {978-80-553-3324-3}, pages = {400 -- 405}, 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} } @inproceedings{EndresAckva, author = {Endres, Julian and Ackva, Ansgar}, title = {Parallel Hybrid Three-Phase Inverter with Direct Current Control and Current Error Compensation}, series = {PCIM Europe 2015; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management; Proceedings of}, booktitle = {PCIM Europe 2015; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management; Proceedings of}, editor = {PCIM GmbH, Mesago}, isbn = {978-3-8007-3924-0}, pages = {619 -- 626}, language = {en} } @inproceedings{ZieglerOeserHeinetal., author = {Ziegler, Andreas and Oeser, David and Hein, Thiemo and Ackva, Ansgar}, title = {Development and Application of an Active Balancing System for Lithium-Ion Cells}, series = {2019 IEEE Vehicle Power and Propulsion Conference (VPPC)}, booktitle = {2019 IEEE Vehicle Power and Propulsion Conference (VPPC)}, isbn = {978-1-7281-1249-7}, doi = {10.1109/VPPC46532.2019.8952317}, pages = {1 -- 6}, language = {en} } @inproceedings{BraunSchreibmannAckvaetal., author = {Braun, Peter and Schreibmann, Vitaliy and Ackva, Ansgar and Balzer, Arndt and Bayer, Sven}, title = {PEDELEC}, series = {Proceedings of the 6th RMUTP International Conference on Science, Technology and Innovation for Sustainable Development: Current Challenges towards Creative and Green Economy}, booktitle = {Proceedings of the 6th RMUTP International Conference on Science, Technology and Innovation for Sustainable Development: Current Challenges towards Creative and Green Economy}, 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} } @inproceedings{AckvaEndresHofmann, author = {Ackva, Ansgar and Endres, Julian and Hofmann, Martin}, title = {Novel line-side inverter with active filter option: Two paralleled inverters with high speed direct current control algorithms}, series = {Power Electronics for Distributed Generation Systems (PEDG), 2013 4th IEEE International Symposium on}, booktitle = {Power Electronics for Distributed Generation Systems (PEDG), 2013 4th IEEE International Symposium on}, isbn = {978-1-4799-0692-5}, doi = {10.1109/PEDG.2013.6785635}, pages = {1 -- 6}, 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{ZieglerOeserArndtetal., author = {Ziegler, Andreas and Oeser, David and Arndt, Bernhard and Ackva, Ansgar}, title = {Comparison of Active and Passive Balancing by a Long Term Test Including a Post-Mortem Analysis of all Single Battery Cells}, series = {2018 International IEEE Conference and Workshop in {\´O}buda on Electrical and Power Engineering (CANDO-EPE)}, booktitle = {2018 International IEEE Conference and Workshop in {\´O}buda on Electrical and Power Engineering (CANDO-EPE)}, isbn = {978-1-7281-1154-4}, doi = {10.1109/CANDO-EPE.2018.8601165}, pages = {15 -- 20}, 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{OeserZieglerArndtetal., author = {Oeser, David and Ziegler, Andreas and Arndt, Bernhard and Ackva, Ansgar}, title = {Effectiveness of Active Balancing on High Dispersion Batteries}, series = {2018 International IEEE Conference and Workshop in {\´O}buda on Electrical and Power Engineering (CANDO-EPE)}, booktitle = {2018 International IEEE Conference and Workshop in {\´O}buda on Electrical and Power Engineering (CANDO-EPE)}, isbn = {978-1-7281-1154-4}, doi = {10.1109/CANDO-EPE.2018.8601129}, pages = {21 -- 26}, 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 = {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{SchmittAckva, author = {Schmitt, Maximilian and Ackva, Ansgar}, title = {Active damping of common-mode oscillations in electric drive systems using direct current control}, 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.2017.8098940}, pages = {1 -- 9}, language = {en} } @inproceedings{SchmittDresselAckva, author = {Schmitt, Maximilian and Dreßel, Bernd and Ackva, Ansgar}, title = {Requirements for current and voltage measurement systems in direct current controlled industrial power inverters}, series = {Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC), 2015 IEEE 13th Brazilian}, booktitle = {Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC), 2015 IEEE 13th Brazilian}, isbn = {978-1-4799-8779-5}, doi = {10.1109/COBEP.2015.7420023}, pages = {1 -- 6}, 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{GoebelRaabLandaueretal., author = {G{\"o}bel, Lukas and Raab, Sebastian and Landauer, Markus and Ackva, Ansgar}, title = {Resonant Switching and Power Control of DC-DC-Converters with a Variable Transmission Path}, series = {20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)}, booktitle = {20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)}, editor = {IEEE,}, isbn = {9781538641453}, pages = {1 -- 9}, language = {en} } @inproceedings{SchmittAckva, author = {Schmitt, Maximilian and Ackva, Ansgar}, title = {A Novel Control Strategy for Reducing Common-Mode Currents in Bidirectional Drive Systems}, series = {20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)}, booktitle = {20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)}, publisher = {IEEE}, isbn = {9781538641453}, pages = {1 -- 9}, 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} } @inproceedings{EndresAckva, author = {Endres, Julian and Ackva, Ansgar}, title = {A parallel three-phase converter system for ripple current compensation and passive filter reduction}, 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.2015.7309135}, pages = {1 -- 9}, language = {en} } @inproceedings{RaabAckva, author = {Raab, Sebastian and Ackva, Ansgar}, title = {Active Filtering of DC Ripple Currents Between Converter and Low-Resistive DC Load}, series = {PCIM Europe}, booktitle = {PCIM Europe}, isbn = {9783800746460}, pages = {1854 -- 1859}, language = {en} } @inproceedings{GoebelRaabAckva, author = {G{\"o}bel, Lukas and Raab, Sebastian and Ackva, Ansgar}, title = {A FPGA-Based Algorithm for Soft Switched DC-DC Converters with a Variable Transmission Path}, series = {PCIM Europe}, booktitle = {PCIM Europe}, isbn = {9783800746460}, pages = {1092 -- 1097}, language = {en} } @inproceedings{RaabAckva, author = {Raab, Sebastian and Ackva, Ansgar}, title = {An Approach for Active Damping of DC Ripple Currents in Low-Resistive DC Systems}, series = {20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)}, booktitle = {20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)}, editor = {IEEE,}, isbn = {9781538641453}, pages = {1 -- 9}, language = {en} } @inproceedings{BohnTaubLinkeetal., author = {Bohn, Gunther and Taub, J. and Linke, Andreas and Bayer, Sven and Oeser, David and Ziegler, Andreas and Ettl, P. and Ackva, Ansgar}, title = {High-resolution Interferometric Measurement of Thickness Change on a Lithium-Ion Pouch Battery}, series = {3rd International Conference on Environmental and Energy Engineering (IC3E 2019)}, volume = {281}, booktitle = {3rd International Conference on Environmental and Energy Engineering (IC3E 2019)}, doi = {10.1088/1755-1315/281/1/012030}, pages = {8}, abstract = {Volume change of graphite leads to change in thickness of battery storage layers during discharging and charging. Pouch cell lithium ion batteries are used in the field of electric vehicles and solar home storage. This paper shows a measurement setup for the three-dimensional measurement of thickness change on a flat 6.7mm thick pouch cell using a white light interferometer. With a measuring field of 7.05mm diameter the resulting 3D thickness change record contains 226000 3D readings. The measuring points have a lateral distance of 13.1μm. The repeatability of the measurement is 312.8nm for the individual values and 64.1nm for the average value. In addition, this paper shows how the storage capacity of this pouch cell drops over 30 charge cycles.}, 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{AckvaHueckmannMolchanov, author = {Ackva, Ansgar and H{\"u}ckmann, Benjamin and Molchanov, Oleksii}, title = {Chancen und Grenzen von Active Balancing f{\"u}r Batteriemodule}, series = {EMA-N{\"u}rnberg Elektromobilit{\"a}tsausstellung und Fachtagung, 2014, N{\"u}rnberg}, booktitle = {EMA-N{\"u}rnberg Elektromobilit{\"a}tsausstellung und Fachtagung, 2014, N{\"u}rnberg}, language = {en} } @article{HeinOeserZiegleretal., author = {Hein, Thiemo and Oeser, David and Ziegler, Andreas and Montesinos-Miracle, Daniel and Ackva, Ansgar}, title = {Aging Determination of Series-Connected Lithium-Ion Cells Independent of Module Design}, series = {Batteries}, volume = {9}, journal = {Batteries}, number = {3}, doi = {10.3390/batteries9030172}, abstract = {In this work, a battery consisting of eight commercial NMC/graphite cells connected in series was cycled to 60\% of its initial capacity. During the test, special care was taken to ensure that the results were not influenced by either the module assembly or the module design. For this purpose, the cells were virtually connected in a laboratory environment with the help of the test device as if they were operated together in a battery. Extrinsic influences that affect cell aging were thus reduced to a minimum. Differential Voltage Analysis (DVA), Electrochemical Impedance Spectrum (EIS), and relaxation measurements were performed to analyze the aging behavior of each cell. The results show that despite a theoretically perfect module design, Cell-to-Cell Variations (CtCV) occurred during aging. The shifting Depth of Discharge (DoD) values among the cells further amplify CtCV. Lithium plating was also observed in the faster aging cells after cyclic aging, suggesting that this aging effect contributes significantly to the development of CtCV. After the aging test, the battery was equipped with an active balancing system that maximizes capacity utilization. More important, the balancing charges which are calculated iteratively within the used balancing algorithm show a strong correlation to the pure capacity losses and thus provide a new way to determine the capacity values of each cell individually without disassembling the battery.}, language = {en} } @inproceedings{RaabAckva, author = {Raab, Sebastian and Ackva, Ansgar}, title = {Non-linear hybrid filter for the DC-side ripple current of voltage source converters}, series = {2022 International Symposium on Electromagnetic Compatibility - EMC Europe}, booktitle = {2022 International Symposium on Electromagnetic Compatibility - EMC Europe}, publisher = {IEEE}, isbn = {978-1-6654-0788-5}, issn = {2325-0364}, doi = {10.1109/emceurope51680.2022.9901278}, abstract = {The paper deals with the design of DC-side filters for three-phase voltage source converters of drives connected to an industrial or automotive DC-grid. It points out the problem of designing a filter if the DC-grid impedance and structure are unknown. Therefore, it presents a new non-linear hybrid filter whose filter effect is less dependent on the impedance of the downstream DC-grid and with better immunity against external interferences. The analytical and simulation based design process is explained with help of a concrete example. Results are validated by measurements on an experimental set-up.}, language = {en} } @phdthesis{SchmittPetzoldtAckvaetal., author = {Schmitt, Maximilian and Petzoldt, J{\"u}rgen and Ackva, Ansgar and Stadler, Alexander}, title = {Aktive Dämpfung von Gleichtaktstörungen in elektrischen Antriebssystemen}, publisher = {TU Ilmenau}, address = {Ilmenau}, pages = {156}, abstract = {Die vorliegende Arbeit besch{\"a}ftigt sich mit der Entstehung und Wirkung von Gleichtaktst{\"o}rungen in elektrischen Antriebssystemen. Parasit{\"a}re Gleichtaktimpedanzen bilden zusammen mit Gegentaktimpedanzen des Antriebssystems parasit{\"a}re Resonanzschwingkreise aus, welche von den Schalthandlungen der eingesetzten Umrichter im Antriebssystem zum Schwingen angeregt werden. Einer der beiden Schwerpunkte befasst sich mit der Entwicklung einer analytischen Berechnungsmethode, um die vorhandenen parasit{\"a}ren Gleichtaktpfade sowie deren Resonanzfrequenzen zu ermitteln. Der zweite Schwerpunkt behandelt die M{\"o}glichkeit der aktiven D{\"a}mpfung von Gleichtaktst{\"o}rungen. Hierzu analysiert ein Algorithmus jede einzelne Schaltflanke im Umrichter auf deren Wirkung im Gleichtaktsystem. Anschließend kann diese zeitlich derart verschoben werden, dass die Schaltflanke eine bestm{\"o}gliche D{\"a}mpfung im Gleichtaktsystem erzielt. Einleitend werden die notwendigen Grundlagen zur Umrichtertechnik sowie der Ausbildung und Anregung von Resonanzschwingkreisen am Beispiel eines RLC-Reihenschwingkreises erkl{\"a}rt, der stellvertretend f{\"u}r das stark reduzierte Gleichtaktmodell eines modernen Antriebssystems steht. Die Literaturrecherche gibt einen detaillierten Einblick {\"u}ber aktuelle Methoden der Reduktion von Gleichtaktst{\"o}rungen wieder. Viele wissenschaftliche Ver{\"o}ffentlichungen behandeln modifizierte Ansteuerverfahren f{\"u}r die eingesetzten Umrichter, welche gezielt die Gleichtaktspannungen eines jeden Spannungsraumzeigers ausnutzen. Die Theorie und Funktionsweise des neuen Steuerverfahrens HCad, wird mathematisch hergeleitet und anhand eines idealen Simulationsmodells untersucht. Die Auswertung der Simulationsergebnisse erm{\"o}glicht es bereits, die d{\"a}mpfende Wirkung unter idealen Bedingungen zu quantifizieren. Die Umsetzung eines praxisnahen Laborpr{\"u}fstands dient der Verifikation und dem Vergleich realer Messungen mit den in der Simulation gewonnen Erkenntnissen. Die durchgef{\"u}hrten Messreihen best{\"a}tigen die M{\"o}glichkeit, Gleichtaktst{\"o}rungen mithilfe einer zeitlichen Flankenverschiebung im Umrichter zu bek{\"a}mpfen. Des Weiteren ist gezeigt, dass die Anwendung der aktiven Gleichtaktd{\"a}mpfung neben der eigentlichen Aufgabe eines Steuerverfahrens in vollem Umfang und {\"u}ber den kompletten Modulationsbereich eines Umrichters m{\"o}glich ist.}, language = {de} } @techreport{Ackva, author = {Ackva, Ansgar}, title = {Hochdynamischer Umrichter in Hybridstruktur : Schlussbericht im F{\"o}rderprogramm FHprofUnt : Laufzeit des Vorhabens: 01.10.2012 bis 30.09.3015}, publisher = {Hochschule f{\"u}r angewandte Wissenschaften W{\"u}rzburg-Schweinfurt}, address = {Schweinfurt}, doi = {10.2314/gbv:876282885}, pages = {21}, language = {de} } @techreport{Ackva, author = {Ackva, Ansgar}, title = {Vorhabenbezeichnung: Bat-PA-40 : Schlussbericht : Berichtszeitraum: 01.02.2018 bis 31.01.2019}, publisher = {Hochschule f{\"u}r Angewandte Wissenschaften W{\"u}rzburg-Schweinfurt}, doi = {10.2314/kxp:1681868938}, language = {de} } @techreport{AckvaKuechler, author = {Ackva, Ansgar and K{\"u}chler, Andreas}, title = {Konvergenz elektrischer Energietechnologien : Akronym: KEE-TECH : Schlussbericht zur Erstellung des Strategiekonzepts}, publisher = {Hochschule f{\"u}r angewandte Wissenschaften W{\"u}rzburg-Schweinfurt}, address = {W{\"u}rzburg}, doi = {10.2314/GBV:883086484}, pages = {7}, language = {de} } @techreport{Ackva, author = {Ackva, Ansgar}, title = {Multilevel-Umrichter Pr{\"u}fsystem : Schlussbericht : Berichtszeitraum: 01.09.2014-31.08.2015}, publisher = {Hochschule f{\"u}r angewandte Wissenschaften W{\"u}rzburg-Schweinfurt}, address = {Schweinfurt}, doi = {10.2314/gbv:872408639}, pages = {30}, language = {de} } @inproceedings{AckvaOmbachJunak, author = {Ackva, Ansgar and Ombach, G. and Junak, J.}, title = {Numerical coupled analysis of DC motors including saturation and commutation effects}, series = {2005 European Conference on Power Electronics and Applications}, booktitle = {2005 European Conference on Power Electronics and Applications}, language = {en} } @inproceedings{AckvaReinoldOlesinski, author = {Ackva, Ansgar and Reinold, H. and Olesinski, R.}, title = {A simple and self-adapting high-performance current control scheme for three phase voltage source inverters}, series = {PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference}, booktitle = {PESC '92 Record. 23rd Annual IEEE Power Electronics Specialists Conference}, publisher = {IEEE}, isbn = {0-7803-0695-3}, doi = {10.1109/PESC.1992.254848}, abstract = {An adaptive optimized regulator (AOR) for three-phase voltage source inverters is presented. The zero-voltage vectors are used systematically to reduce the switching frequency and can be reached by switching only one inverter leg. In the steady stage the controller applies to the machine only those three voltage vectors which are directly adjacent to the machine voltage (similar to pulse width modulation). Adaptive identification of position and amplitude of the determining machine voltage vector is realized by multilevel hysteresis comparators and a switching table. The dynamic performance is as excellent as for the three-phase bang-bang controller, and the hardware implementation is very simple}, language = {en} }