@inproceedings{RaabFrauenknechtWellhoeferetal., author = {Raab, Alexander and Frauenknecht, Dominik and Wellh{\"o}fer, Anatoli and Luther, Matthias and Kuri, Ananya}, title = {Hybrid EMT and Phasor based MMC-HVDC Model for Advanced Power System Simulation}, publisher = {IEEE}, abstract = {The objective of this paper is the implementation and comparison of a hybrid phasor-based (RMS) and electromagnetic transient (EMT) modular multilevel converter high voltage direct current (MMC-HVDC) model for advanced and detailed studies of large power systems. The general modeling approach for hybrid simulation of modular multilevel converters for HVDC applications with the corresponding control concepts is described. The HVDC model can be divided into AC and DC components with different simulation time steps and representation using network partitioning. The connected AC grids and converter models are considered in the phasor-based time domain, while the DC connection is simulated in the electromagnetic-transient time domain. The coupling of the models is established by the total energy control of the MMC. The hybrid approach is evaluated in comparison to an average MMC HVDC model in an EMT simulation. The results show the advantages of the hybrid model. The model can be simulated with comparatively low computational effort, while the DC transients can be represented in detail during disturbances.}, language = {en} } @inproceedings{RaabScheibeWellhoeferetal., author = {Raab, Alexander and Scheibe, Christian and Wellh{\"o}fer, Anatoli and Nguyen, T.T.-T. and Frauenknecht, Dominik and Mehlmann, Gert}, title = {Converter-based Control using Co-Simulation with a Power System Simulation Tool}, series = {NEIS 2021 - 9th Conference on Sustainable Energy Supply and Energy Storage Systems}, booktitle = {NEIS 2021 - 9th Conference on Sustainable Energy Supply and Energy Storage Systems}, publisher = {VDE Verlag}, isbn = {978-3-8007-5651-3}, pages = {25 -- 30}, abstract = {The objective of this contribution is to implement a Co-simulation approach for control systems within RMS-based stability analyses of power systems. Inter-process communication via shared memory connects the specialized and focused software environments and enables the data exchange between them. A model of a point-to-point VSC-HVDC system with main controls is presented as the test system to be investigated. Simulations with the model in a fault case show that the results generated with the new approach are similar to those of a single-instance simulation with converted models. Simultaneously, in contrast to the existing alternatives the presented approach exhibits the benefits of Co-simulation related to efforts, costs, efficiency and model continuity, while the models remain within specialized best-in-class tools.}, language = {en} } @inproceedings{ScheibeSemerowMenkeetal., author = {Scheibe, Christian and Semerow, Anatoli and Menke, Jasmin and La Seta, Piergiovanni and Raab, Alexander and Mehlmann, Gert and Luther, Matthias}, title = {A Novel Co-Simulation Concept using Interprocess Communication in Shared Memory}, series = {2019 IEEE Power and Energy Society General Meeting}, booktitle = {2019 IEEE Power and Energy Society General Meeting}, publisher = {IEEE Computer Society Press}, isbn = {978-1-7281-1981-6}, issn = {1944-9925}, doi = {10.1109/PESGM40551.2019.8973964}, abstract = {The paper describes a novel co-simulation concept for power system analysis using interprocess communication via shared memory. This innovative approach enables manufacturers, utilities and other parties a continuous and efficient use of simulation models within the phases of preliminary investigations, planning, design and operation. It paves the way for the practical implementation of the concept of a digital twin. Besides the technical specification of the process communication, the realization of process synchronization and the model interfaces are comprehensively discussed. Performance topics are practically treated. Finally, as an application of the novel concept, a successfully implemented study in a power system simulation tool is demonstrated in order to prove its practical feasibility.}, language = {en} } @article{BrostRaabKleinoederetal., author = {Brost, Alexander and Raab, Jens and Kleinoeder, Andreas and Kurzendorfer, Tanja and Bourier, Felix and Koch, Martin and Hoffmann, Matthias and Strobel, Norbert and Kurzidim, Klaus and Hornegger, Joachim}, title = {Medizinische Bildverarbeitung f{\"u}r die minimal-invasive Behandlung von Vorhofflimmern}, series = {Deutsche Zeitschrift f{\"u}r klinische Forschung, Innovation und Praxis (DZKF)}, volume = {17}, journal = {Deutsche Zeitschrift f{\"u}r klinische Forschung, Innovation und Praxis (DZKF)}, number = {6}, publisher = {Mediengruppe Oberfranken Fachverlage GmbH \& Co. KG}, pages = {36 -- 41}, language = {en} } @inproceedings{DobhanEberhardtHasenederetal., author = {Dobhan, Alexander and Eberhardt, Lars and Haseneder, Markus and Raab, Heiko and Rabenstein, Steffen and Treutlein, Axel and Wahyudi, Vincent and Storath, Martin and Storath, Martin}, title = {Digitalization in Small-Load-Carrier Management}, series = {Proceedings of the 27th International Conference on Enterprise Information Systems}, booktitle = {Proceedings of the 27th International Conference on Enterprise Information Systems}, publisher = {SCITEPRESS - Science and Technology Publications}, doi = {10.5220/0013363200003929}, pages = {848 -- 855}, language = {en} } @inproceedings{HartmannDobhanEngelmannetal., author = {Hartmann, J{\"u}rgen and Dobhan, Alexander and Engelmann, Bastian and Eberhardt, Lars and Heusinger, Moritz and Raab, C and Schleif, Frank-Michael and T{\"u}rk, M.}, title = {Optimierung von Prozessen und Werkzeugmaschinen durch Bereitstellung, Analyse und Soll-Ist-Vergleich von Produktionsdaten: Digitalkonferenz}, language = {en} } @inproceedings{RaabFrauenknechtMehlmannetal., author = {Raab, Alexander and Frauenknecht, Dominik and Mehlmann, Gert and Luther, Matthias and Wellh{\"o}fer, Anatoli}, title = {Hybrid Phasor- and EMT-based Multi-Terminal MMC-HVDC Model with Grid-Forming Control}, series = {2023 IEEE Power \& Energy Society General Meeting (PESGM)}, booktitle = {2023 IEEE Power \& Energy Society General Meeting (PESGM)}, publisher = {IEEE}, isbn = {978-1-6654-6441-3}, issn = {1944-9933}, doi = {10.1109/pesgm52003.2023.10253370}, abstract = {The objective of this paper is to apply a hybrid phasor-(RMS) and electromagnetic transient-based (EMT) simulation approach to a multi-terminal modular multilevel converter high voltage direct current (MT MMC-HVDC) model. The MMC of the MT-HVDC are implemented with grid-following and grid-forming control. An overview of the MT MMC-HVDC is given and the grid-forming and voltage droop control are described. The AC and DC networks of the MMC are divided into an RMS and an EMT partition with different simulation time steps. The grid-forming and grid-following control with inner AC current control are assigned to the RMS partition. The total energy and inner converter control are assigned to the EMT partition. The model is initialized for a correct transition from power flow to time domain simulation. The approach is implemented in a meshed power system model, where grid-forming MMC provide voltage and frequency for an offshore wind farm and a synchronous grid. The simulations are performed with the AC networks in RMS and the DC networks in EMT. The results show that the interactions between the AC and DC grids can be studied in a hybrid simulation framework. The DC system response is detailed, while the AC system is reduced to machine and controller dynamics.}, language = {en} } @inproceedings{FrauenknechtSchweinshautRaabetal., author = {Frauenknecht, Dominik and Schweinshaut, Bernd and Raab, Alexander and Mehlmann, Gert and Luther, Matthias and Wiest, Pascal and Heyde, Chris Oliver and Wellh{\"o}fer, Anatoli}, title = {Stability Analysis of Converter-Dominated Power Systems by Phasor-Based and Electromagnetic Transient Simulation}, series = {15. VDE ETG/VDI/VDE-GMA-Fachtagung „Netzregelung und Systemf{\"u}hrung"}, booktitle = {15. VDE ETG/VDI/VDE-GMA-Fachtagung „Netzregelung und Systemf{\"u}hrung"}, editor = {VDE ETG,}, isbn = {978-3-8007-6292-7}, language = {en} }