@inproceedings{BuedelKuhlmannHerkommeretal.2021, author = {B{\"u}del, Johannes and Kuhlmann, Kai and Herkommer, Christian and Teigelk{\"o}tter, Johannes}, title = {Advanced Control Methods for High Performance Dual Two-Level Inverter for Traction Application}, series = {Electromechanical Drive Systems 2021; ETG Symposium; 9-10 Nov. 2021}, booktitle = {Electromechanical Drive Systems 2021; ETG Symposium; 9-10 Nov. 2021}, isbn = {978-3-8007-5685-8}, year = {2021}, abstract = {The topology of the dual two-level inverter in combination with an electrical machine with open-end winding is an optimal solution for the realization of high requirements from the automotive sector for high-performance traction drives. In this publication, methods for extending the operating range and improving output voltage and current quality are presented for synchronous as well as asynchronous PWM methods for the entire operating range for this system configuration. Emphasis is placed on symmetrical power sharing between the inverters to maximize the power range. Optimal integration of the system is achieved by the topology-related possibility of DC fast charging of the energy storages from a DC grid without an additional charging unit.}, subject = {Wechselrichter}, language = {en} } @inproceedings{BuedelTeigelkoetterStocketal.2020, author = {B{\"u}del, Johannes and Teigelk{\"o}tter, Johannes and Stock, Alexander and Herkommer, Christian and Kuhlmann, Kai}, title = {High Dynamic Power Balancing for Dual Two-Level Inverters during High-Speed Machine Operation}, series = {2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)}, booktitle = {2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)}, isbn = {978-1-7281-9807-1}, doi = {10.23919/EPE20ECCEEurope43536.2020.9215695}, year = {2020}, abstract = {This paper aims to present optimized square-wave modulation strategies for the dual two-level inverter, fed by two separate and galvanically isolated energy sources, to balance and control the energy distribution of both inverter systems. Especially for high-speed operation, the methods keep the machine in the required state while decreasing the switching operations to a minimum. Method one aims to compensate voltage fluctuations of variable DC-link voltages, while the second method ensures a symmetrical power distribution for the two inverter systems. In addition, both methods offer the possibility of adapting the amplitude of the usually fixed fundamental load voltage during square-wave modulation.}, subject = {Wechselrichter}, language = {en} } @inproceedings{BuedelTeigelkoetterStocketal.2021, author = {B{\"u}del, Johannes and Teigelk{\"o}tter, Johannes and Stock, Alexander and Kuhlmann, Kai and Lang, Klaus and Ott, Patrick}, title = {Testing of High-Power Traction Batteries}, series = {SMSI 2021 - System of Units and Metreological Infrastructure}, booktitle = {SMSI 2021 - System of Units and Metreological Infrastructure}, isbn = {978-3-9819376-4-0}, doi = {10.5162/SMSI2021/C7.}, pages = {294 -- 295}, year = {2021}, abstract = {Electric drives in road vehicles with a battery as energy storage are about to be introduced to the mass market. In order to guarantee the quality and operational safety of battery-powered vehicles, considerable efforts must be made by car manufacturers and their suppliers. Since the properties of the batteries significantly determine the performance of the vehicles, special test benches with precise measuring systems are required for the accurate determination of the battery properties. The safety devices of the traction batteries must also be tested on high-performance test benches. In this paper the necessary test benches and the corresponding measuring systems are presented. Estimations of the measurement uncertainty and possibilities to increase measurement accuracy are presented.}, subject = {Traktionsbatterie}, language = {en} } @inproceedings{BuedelKuhlmannTeigelkoetter2024, author = {B{\"u}del, Johannes and Kuhlmann, Kai and Teigelk{\"o}tter, Johannes}, title = {Improved DC-Charging for Traction Drives with Hybrid Powered Dual Two-Level Inverter}, series = {2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe)}, booktitle = {2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe)}, doi = {10.23919/EPE23ECCEEurope58414.2023.10264409}, year = {2024}, abstract = {This contribution aims to present a new concept for power sharing of traction drives supplied by local DC grids such as partly or full equipped trolley wire nets. Therefore, a dual two-level inverter with two separate energy storages and an open-end winding machine is used. New control algorithms allow the charging of the energy sources whether two batteries, a combination of a battery and a fuel cell or a combination of battery and a flying capacitor is used. Within the scope of battery performance, this application is able to absorb or deliver the required power from a DC grid and still feed the electrical machine to enable a driving movement of the electric vehicle. As the presented concepts enable voltage balancing due to different battery loads and the use of only one dynamic energy storage in the charging operation, the shown application aims to achieve the high utilization of an electric vehicle powered by a (partly equipped) DC-grid.}, subject = {Wechselrichter}, language = {en} } @inproceedings{BuedelTeigelkoetterKuhlmann2023, author = {B{\"u}del, Johannes and Teigelk{\"o}tter, Johannes and Kuhlmann, Kai}, title = {Stoßstromversuche zur Qualifizierung von sicherheitsrelevanten Komponenten im Antriebsstrang eines Elektrofahrzeuges}, series = {Testen und Validieren elektrischer Antriebsstr{\"a}nge 2023}, booktitle = {Testen und Validieren elektrischer Antriebsstr{\"a}nge 2023}, doi = {doi.org/10.51202/9783181024126}, year = {2023}, abstract = {Progress in the development of traction batteries requires high-performance test benches to qualify the safety-relevant components in the battery management system (BMS) for use in electric vehicles. Since all possible fault cases under all permissible operating conditions must be covered during qualification, only synthetic test circuits, in which a test requires only a short setup time, are used for this task. In this paper, an n-stage surge current generator for the generation of high short-circuit currents is presented. Using the example of a four-stage resonant circuit surge current converter, the advantages of this test circuit are explained and demonstrated by measurements. Furthermore, instructions for measuring the surge currents are given.}, subject = {Elektrofahrzeug}, language = {en} } @inproceedings{BuedelHerkommerKuhlmannetal.2021, author = {B{\"u}del, Johannes and Herkommer, Christian and Kuhlmann, Kai and Teigelk{\"o}tter, Johannes}, title = {Advanced DC-charging Methods for Traction Drives with Dual Two-Level Inverter During Machine Operation}, series = {2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)}, booktitle = {2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)}, doi = {10.23919/EPE21ECCEEurope50061.2021.9570611}, year = {2021}, abstract = {This paper aims to present a concept and especially developed control methods for an open-end winding traction drive, powered by a dual two-level inverter, where the two separate energy sources can be charged via a DC grid during operation and while being standstill. For achieving a high quality DC-current, the parasitic Back-EMF harmonics of the electrical machine will be compensated. The application aims to achieve high utilisation of the electric vehicle in combination with a partly equipped trolley wire net.}, subject = {Wechselrichter}, language = {en} }