TY - CHAP A1 - Raab, Alexander A1 - Frauenknecht, Dominik A1 - Wellhöfer, Anatoli A1 - Luther, Matthias A1 - Kuri, Ananya T1 - Hybrid EMT and Phasor based MMC-HVDC Model for Advanced Power System Simulation N2 - 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. Y1 - 2022 UR - 10.1109/PESGM48719.2022.9917109 PB - IEEE ER - TY - CHAP A1 - Raab, Alexander A1 - Scheibe, Christian A1 - Wellhöfer, Anatoli A1 - Nguyen, T.T.-T. A1 - Frauenknecht, Dominik A1 - Mehlmann, Gert T1 - Converter-based Control using Co-Simulation with a Power System Simulation Tool T2 - NEIS 2021 - 9th Conference on Sustainable Energy Supply and Energy Storage Systems N2 - 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. Y1 - 2021 SN - 978-3-8007-5651-3 SP - 25 EP - 30 PB - VDE Verlag ER - TY - CHAP A1 - Raab, Alexander A1 - Frauenknecht, Dominik A1 - Mehlmann, Gert A1 - Luther, Matthias A1 - Wellhöfer, Anatoli T1 - Hybrid Phasor- and EMT-based Multi-Terminal MMC-HVDC Model with Grid-Forming Control T2 - 2023 IEEE Power & Energy Society General Meeting (PESGM) N2 - 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. Y1 - 2023 SN - 978-1-6654-6441-3 U6 - https://doi.org/10.1109/pesgm52003.2023.10253370 SN - 1944-9933 PB - IEEE ER - TY - CHAP A1 - Frauenknecht, Dominik A1 - Schweinshaut, Bernd A1 - Raab, Alexander A1 - Mehlmann, Gert A1 - Luther, Matthias A1 - Wiest, Pascal A1 - Heyde, Chris Oliver A1 - Wellhöfer, Anatoli ED - VDE ETG, T1 - Stability Analysis of Converter-Dominated Power Systems by Phasor-Based and Electromagnetic Transient Simulation T2 - 15. VDE ETG/VDI/VDE-GMA-Fachtagung „Netzregelung und Systemführung“ Y1 - 2024 SN - 978-3-8007-6292-7 ER -