@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{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} }