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Article

Transient Stability Analysis and Post-Fault Restart Strategy for Current-Limited Grid-Forming Converter

Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria
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Academic Editor: Andrea Mariscotti
Energies 2022, 15(10), 3552; https://doi.org/10.3390/en15103552
Received: 30 March 2022 / Revised: 27 April 2022 / Accepted: 11 May 2022 / Published: 12 May 2022
Grid-forming converters are attracting attention for their significant advantages in terms of stability in a weak grid and simulated inertia. However, while they offer great flexibility due to the use of power semiconductors, they are also affected by their low current-carrying capacity. This means that during a fault, instead of the usual voltage control, a current limiting control is active, which changes the dynamic performance of the converter and influences transient stability. This manuscript focuses on the dynamic performance of grid-forming converters during the restart phase at the post-fault period, and proposes an initial phase threshold to prevent the converter from going into current saturation. Based on this, the manuscript proposes several restart strategies during the post-fault period, by using some fast resynchronization methods in order to meet the requirements of the converter’s stable operation and fast active power restoration. Finally, the above findings and the proposed strategies are validated by a joint control hardware-in-the-loop system. View Full-Text
Keywords: grid-forming; current limit; large-signal; Low-Voltage Ride Through (LVRT); post-fault; controller hardware-in-the-loop grid-forming; current limit; large-signal; Low-Voltage Ride Through (LVRT); post-fault; controller hardware-in-the-loop
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MDPI and ACS Style

Zhang, Z.; Lehmal, C.; Hackl, P.; Schuerhuber, R. Transient Stability Analysis and Post-Fault Restart Strategy for Current-Limited Grid-Forming Converter. Energies 2022, 15, 3552. https://doi.org/10.3390/en15103552

AMA Style

Zhang Z, Lehmal C, Hackl P, Schuerhuber R. Transient Stability Analysis and Post-Fault Restart Strategy for Current-Limited Grid-Forming Converter. Energies. 2022; 15(10):3552. https://doi.org/10.3390/en15103552

Chicago/Turabian Style

Zhang, Ziqian, Carina Lehmal, Philipp Hackl, and Robert Schuerhuber. 2022. "Transient Stability Analysis and Post-Fault Restart Strategy for Current-Limited Grid-Forming Converter" Energies 15, no. 10: 3552. https://doi.org/10.3390/en15103552

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