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

Ziqian Zhang, Carina Lehmal, Philipp Hackl and Robert Schuerhuber
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Ziqian Zhang: Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria
Carina Lehmal: Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria
Philipp Hackl: Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria
Robert Schuerhuber: Institute of Electrical Power Systems, Graz University of Technology, 8010 Graz, Austria

Energies, 2022, vol. 15, issue 10, 1-26

Abstract: 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.

Keywords: grid-forming; current limit; large-signal; Low-Voltage Ride Through (LVRT); post-fault; controller hardware-in-the-loop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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