@inproceedings{29235, author = {{Gottschalk, Sebastian and Aziz, Muhammad Suffyan and Yigitbas, Enes and Engels, Gregor}}, booktitle = {{Software Business - 12th International Conference, ICSOB 2021, Drammen, Norway, December 2-3, 2021, Proceedings}}, editor = {{Wang, Xiaofeng and Martini, Antonio and Nguyen-Duc, Anh and Stray, Viktoria}}, pages = {{205–220}}, publisher = {{Springer}}, title = {{{Design Principles for a Crowd-Based Prototype Validation Platform}}}, doi = {{10.1007/978-3-030-91983-2_16}}, volume = {{434}}, year = {{2021}}, } @inbook{25528, abstract = {{Developing effective business models is a complex process for a company where several tasks (e.g., conduct customer interviews) need to be accomplished, and decisions (e.g., advertisement as a revenue stream) must be made. Here, domain experts can guide the choices of tasks and decisions with their knowledge. Nevertheless, this knowledge needs to match the situation of the company (e.g., financial resources) and the application domain of the product/service (e.g., mobile app) to reduce the risk of developing ineffective business models with low market penetration. This is not covered by one-size-fits-all development methods without tailoring before the enaction. Therefore, we conduct a design science study to create a situation-specific development approach for business models. Based on situational method engineering and our previous work in storing knowledge of methods and models in distinct repositories, this paper shows the situation-specific composition and enaction of business model development methods. First, the method engineer composes the development method out of both repositories based on the situational context. Second, the business developer enacts the method and develops the business model. We implement the approach in a tool and evaluate it with a industrial case study on mobile apps.}}, author = {{Gottschalk, Sebastian and Yigitbas, Enes and Nowosad, Alexander and Engels, Gregor}}, booktitle = {{Product-focused Software Process Improvement}}, keywords = {{Business Model Development, Situational Method Engineering, Lean Development, Kanban Boards, Canvas Models}}, location = {{Turin}}, publisher = {{Springer}}, title = {{{Situation- and Domain-specific Composition and Enactment of Business Model Development Methods}}}, year = {{2021}}, } @book{29876, author = {{Schröder, Dierk and Böcker, Joachim}}, isbn = {{978-3-662-62699-3}}, pages = {{1625}}, publisher = {{Springer Nature}}, title = {{{Elektrische Antriebe – Regelung von Antriebssystemen}}}, doi = {{10.1007/978-3-662-62700-6}}, year = {{2021}}, } @inproceedings{29849, abstract = {{DC-DC converters for on-board chargers (OBC) of electrical vehicles are usually galvanically isolated allowing modular single-phase PFC front-end solutions, but require transformers which are more bulky, costly and lossy than inductors of non-isolated DC-DCs. Furthermore, for vehicle-to-grid applications, bidirectional converters with transformers are generally more complex and have a higher count on semiconductor switches than transformerless solutions. However, when using non-isolated DC-DC converters within an OBC, the large common-mode (CM) capacitance comprising capacitive parasitics of the traction battery as well as explicit Y-capacitors connecting the high-voltage DC-system (HV-system) within specific HV-loads to ground has to be considered. For the PFC front-end stage, when supplied from the three-phase mains this means that generation of high-frequency and high-amplitude CM voltages, as it is common e.g. with the conventional six-switch full-bridge converter, has to be strictly avoided. For this reason, a modified topology is suggested leading to a different mode of operation and to a very low common-mode noise behaviour: The three-phase four-wire full-bridge PFC with split DC-link, whose midpoint is connected to the mains neutral provides very stable potentials at the DC-link rails and therefore it can be classified as Zero-CM-topology.For dedicated single-phase operation, as required for most OBC, an additional balancing leg may be added to the topology to reduce the required DC-link capacitance and allow non-electrolytic capacitors.The function of the bidirectional Zero-CM three-phase four-wire full-bridge PFC was verified by simulation and on an 11 kW-laboratory sample. The power factor is above 0.999 and an efficiency of 98 % is measured.}}, author = {{Strothmann, Benjamin and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{2021 IEEE Applied Power Electronics Conference and Exposition (APEC)}}, keywords = {{Three-phase four-wire, OBC, Y2G, PFC, CM, EY charger, balancing circuit}}, publisher = {{IEEE}}, title = {{{Common-Mode-Free Bidirectional Three-Phase PFC-Rectifier for Non-Isolated EV Charger}}}, doi = {{10.1109/apec42165.2021.9487462}}, year = {{2021}}, } @article{29657, author = {{Brosch, Anian and Wallscheid, Oliver and Böcker, Joachim}}, journal = {{IEEE Open Journal of Industry Applications}}, pages = {{47–63}}, publisher = {{IEEE}}, title = {{{Model Predictive Control of Permanent Magnet Synchronous Motors in the Overmodulation Region Including Six-Step Operation}}}, doi = {{10.1109/OJIA.2021.3066105}}, volume = {{2}}, year = {{2021}}, } @inproceedings{29663, author = {{Gedlu, Emebet Gebeyehu and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{2021 IEEE International Electric Machines & Drives Conference (IEMDC)}}, pages = {{1–8}}, title = {{{Temperature estimation of electric machines using a hybrid model of feed-forward neural and low-order lumped-parameter thermal networks}}}, doi = {{10.1109/IEMDC47953.2021.9449548}}, year = {{2021}}, } @article{29892, author = {{Rehlaender, Philipp and Schafmeister, Frank and Böcker, Joachim}}, issn = {{0885-8993}}, journal = {{IEEE Transactions on Power Electronics}}, keywords = {{Electrical and Electronic Engineering}}, number = {{9}}, pages = {{10065--10080}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Interleaved Single-Stage LLC Converter Design Utilizing Half- and Full-Bridge Configurations for Wide Voltage Transfer Ratio Applications}}}, doi = {{10.1109/tpel.2021.3067843}}, volume = {{36}}, year = {{2021}}, } @inproceedings{29895, author = {{Korthauer, Bastian and Rehlaender, Philipp and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{2021 IEEE Applied Power Electronics Conference and Exposition (APEC)}}, publisher = {{IEEE}}, title = {{{Design and Analysis of a Regenerative Snubber for a 2.2 kW Active-Clamp Forward Converter with Low-Voltage Output}}}, doi = {{10.1109/apec42165.2021.9487130}}, year = {{2021}}, } @article{22162, author = {{Book, Gerrit and Traue, Arne and Balakrishna, Praneeth and Brosch, Anian and Schenke, Maximilian and Hanke, Sören and Kirchgässner, Wilhelm and Wallscheid, Oliver}}, issn = {{2644-1314}}, journal = {{IEEE Open Journal of Power Electronics}}, pages = {{187--201}}, title = {{{Transferring Online Reinforcement Learning for Electric Motor Control From Simulation to Real-World Experiments}}}, doi = {{10.1109/ojpel.2021.3065877}}, year = {{2021}}, } @article{29653, author = {{Weber, Daniel and Heid, Stefan and Bode, Henrik and Lange, Jarren and Hüllermeier, Eyke and Wallscheid, Oliver}}, journal = {{IEEE Access}}, pages = {{35654–35669}}, publisher = {{IEEE}}, title = {{{Safe Bayesian Optimization for Data-Driven Power Electronics Control Design in Microgrids: From Simulations to Real-World Experiments}}}, doi = {{10.1109/ACCESS.2021.3062144}}, volume = {{9}}, year = {{2021}}, } @inproceedings{29850, abstract = {{In electric vehicles (EV) the large common-mode (CM) capacitance comprising capacitive parasitics of the traction battery as well as explicit Y-capacitors connecting within specific loads the high-voltage DC-system (HV-system) to ground, can cause issues when using non-isolated EV Chargers. One solution for a power factor correction (PFC) rectifier that is capable to operate with a non-isolated DC-DC converter, is the three-phase four-wire full-bridge PFC, with split DC-link, whose midpoint is connected to the mains neutral. Therefore, it provides very stable potentials at the DC-link rails and accordingly can be classified as Zero-CM topology, which facilitates a common-mode-free operation. When to be operated at a single-phase supply, which is a common requirement for On-board chargers (OBCs) this topology results in the voltage-doubler PFC (V2-PFC) being characterised by a comparably large DC-link voltage ripple at mains frequency. If the DC-link capacitance shall be minimized, for instance to avoid lifetime-limited electrolytic capacitors, two more circuits in addition to the original V2-PFC are proposed for keeping the common-mode-free operation: A balancing circuit (BC), that balances the voltages over the split capacitors and a ripple port (RP), that buffers the 100 Hz power pulsation of the mains. For both circuits the available two bridge legs of the three-phase topology in single-phase operation may be utilized. A 3.7 kW laboratory sample verifies the functionality of the additional circuits in conjunction with the V2-PFC and achieves an efficiency of 95 %.}}, author = {{Strothmann, Benjamin and Book, Gerrit and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{PCIM Europe digital days 2021; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management}}, pages = {{1--8}}, title = {{{Single-Phase Operation of Common-Mode-Free Bidirectional Three-Phase PFC-Rectifier for Non-Isolated EV Charger with Minimized DC-Link}}}, year = {{2021}}, } @inproceedings{29871, abstract = {{LLC resonant converters typically employ power MOSFETs in their inverter stage. The generally weak reverse recovery behaviour of the intrinsic body diodes of those MOSFETs causes significant turn-on losses when being forced to hard commutations. Continuous operation in this way will lead to self-destruction of the transistors. Consequently, zero-voltage switching (ZVS) is essential in a MOSFET-based inverter stage. To ensure ZVS, the LLC converter is operated in the inductive region. On the contrary, IGBTs show dominant turn-off losses and are therefore conventionally not applied in LLC converters typically requiring high switching frequencies to achieve low output voltages. However, if the LLC converter is intentionally designed for capacitive operation, zero-current switching (ZCS) is enabled and thus robust and cost-efficient IGBTs can be applied in the inverter stage. The aim of this work is to investigate the use IGBTs in the inverter of an LLC converter. The theory behind the capacitive operated LLC is derived using a switched simulation model and compared with the fundamental harmonic approximation (FHA). The results prove FHA to be useless for practical converter design. Instead, a stress value analysis based on switched model simulations is proposed to the design a capacitive operated LLC utilizing ZCS. A 2 kW prototype for on-board EV applications was built to verify the theory and design approach. The prototype confirms the derived theory and thus the deployment of IGBTs in the inverter stage of LLC resonant converters. Synchronous rectification turns out to require a specific control solution, but if given the resulting efficiency in the most critical operation point exceeds the value of a MOSFET-based (inductive operated) LLC-design of an identical application. Therefore, this concept should be further developed.}}, author = {{Urbaneck, Daniel and Rehlaender, Philipp and Böcker, Joachim and Schafmeister, Frank}}, booktitle = {{2021 IEEE Applied Power Electronics Conference and Exposition (APEC)}}, location = {{Arizona}}, title = {{{LLC Converter in Capacitive Operation Utilizing ZCS for IGBTs – Theory, Concept and Verification of a 2 kW DC-DC Converter for EVs}}}, year = {{2021}}, } @article{30030, author = {{Stender, Marius and Wallscheid, Oliver and Böcker, Joachim}}, issn = {{0885-8993}}, journal = {{IEEE Transactions on Power Electronics}}, keywords = {{Electrical and Electronic Engineering}}, number = {{11}}, pages = {{13261--13274}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Accurate Torque Control for Induction Motors by Utilizing a Globally Optimized Flux Observer}}}, doi = {{10.1109/tpel.2021.3080129}}, volume = {{36}}, year = {{2021}}, } @inproceedings{30031, author = {{Stender, Marius and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC)}}, publisher = {{IEEE}}, title = {{{Accurate Torque Estimation for Induction Motors by Utilizing a Hybrid Machine Learning Approach}}}, doi = {{10.1109/pemc48073.2021.9432615}}, year = {{2021}}, } @inproceedings{30029, author = {{Stender, Marius and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society}}, publisher = {{IEEE}}, title = {{{Combined Electrical-Thermal Gray-Box Model and Parameter Identification of an Induction Motor}}}, doi = {{10.1109/iecon48115.2021.9589225}}, year = {{2021}}, } @inproceedings{30032, author = {{Stender, Marius and Wallscheid, Oliver and Böcker, Joachim}}, booktitle = {{2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC)}}, publisher = {{IEEE}}, title = {{{Gray-Box Loss Model for Induction Motor Drives}}}, doi = {{10.1109/pemc48073.2021.9432491}}, year = {{2021}}, } @inproceedings{30084, author = {{Karakaya, Kadiray and Bodden, Eric}}, booktitle = {{2021 IEEE 21st International Working Conference on Source Code Analysis and Manipulation (SCAM)}}, publisher = {{IEEE}}, title = {{{SootFX: A Static Code Feature Extraction Tool for Java and Android}}}, doi = {{10.1109/scam52516.2021.00030}}, year = {{2021}}, } @inproceedings{29665, author = {{Hanke, Sören and Wallscheid, Oliver and Böcker, Joachim}}, publisher = {{IET Digital Library}}, title = {{{Comparison of Artificial Neural Network and Least Squares Prediction Models for Finite-Control-Set Model Predictive Control of a Permanent Magnet Synchronous Motor}}}, doi = {{10.1049%2Ficp.2021.1122}}, year = {{2021}}, } @article{29664, author = {{Wallscheid, Oliver}}, journal = {{IEEE Open Journal of Industry Applications}}, publisher = {{IEEE}}, title = {{{Thermal Monitoring of Electric Motors: State-of-the-Art Review and Future Challenges}}}, year = {{2021}}, } @article{21251, author = {{Kirchgässner, Wilhelm and Wallscheid, Oliver and Böcker, Joachim}}, issn = {{0885-8969}}, journal = {{IEEE Transactions on Energy Conversion}}, number = {{3}}, pages = {{2059 -- 2067}}, title = {{{Data-Driven Permanent Magnet Temperature Estimation in Synchronous Motors with Supervised Machine Learning: A Benchmark}}}, doi = {{10.1109/tec.2021.3052546}}, volume = {{36}}, year = {{2021}}, }