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5 results on '"Grune, Rayk"'

3. Validation of Wind Turbine Models Based on Test Bench Measurements: A System for Theoretical Representation of the Grid Replica.

Author

Frehn, Anica, Sdun, Jens, Grune, Rayk, and Monti, Antonello

Subjects
TIME-frequency analysis, VOLTAGE references, BENCHES, WIND turbines
Abstract

In recent years, nacelle test benches for wind turbines have been developed internationally. New standards are currently being developed that explicitly refer to the measurement of the electrical properties of wind turbines on these test benches. Thus, they are suitable for measuring the electrical properties required for certification. Another part of the certification is the creation and validation of suitable models of the wind turbine, which are used for stability analyses of the utility grid. Validation requires a suitable model of grid replication on the test benches, which is not yet covered by any applicable standard. Such models should be as simplified a representation of the artificial grid replication as possible to ensure that they are accessible to certification bodies. A model of the grid emulator installed at the CWD of RWTH Aachen University, which was validated with real measurement data, serves as a reference. A step-by-step reduction of the model's depth up to the system's technical representation is followed by a model evaluation with respect to the level of detail and an analysis of time and frequency. The evaluation shows that even a highly simplified model consisting of a reference voltage and an impedance replica meets the requirements for the validation of wind turbine models according to IEC 61400-27-2. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Analysis and mitigation of submodule capacitor overvoltage for MMC-based grid emulator under LVRT test

Author

Li, Zejie, Zhao, Fangzhou, Chen, Xingxing, Munk-Nielsen, Stig, Geske, Martin, Grune, Rayk, and Wang, Xiongfei

Subjects
Testing, Grid emulator, SM capacitor overvoltage, MMC
Abstract

The modular multilevel converter (MMC)-based grid emulator is recently reported as a promising approach for grid-code compliance testing of next-generation wind turbines. This paper reveals the overvoltage on the submodule (SM) capacitor of the MMC-based grid emulator during the low-voltage ride-through (LVRT) test, and proposes an approach to address such issue. First, a simplified average model is developed to quantify the maximum and minimum SM capacitor voltage during the LVRT test. Then, a SM capacitor energy balancing approach is proposed to mitigate the transient overvoltage, which limits the SM capacitor voltage within 60%~110% of the rated voltage. Simulation results have confirmed the correctness of the theoretical analysis.

Published
2022

5. High Voltage Ride Through - Challenges of a 66 kV FRT Test Equipment.

Author

Klosse, Rainer, Krause, Gregor, Grune, Rayk, and Heinecke, Sascha

Subjects
AUTOTRANSFORMERS, OFFSHORE wind power plants, ELECTRIC inductors, VOLTAGE control, WIND turbine efficiency, ELECTRIC power distribution grids
Abstract

High-voltage power equipment like offshore wind farms is exposed to grid faults within its supplying high-voltage power network. It is desirable to perform standardized grid code testing directly on site including all turbine components. The herein presented test equipment is capable to emulate the required undervoltage and overvoltage grid faults on the 66 kV high-voltage level without the need for additional transformers. Its mobile design allows the use at various test sites. Fully installed high-voltage wind turbine systems can be tested without further adjustments and under real environmental conditions. [ABSTRACT FROM AUTHOR]

Published
2020

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