A comparative study of negative sequence support of grid-forming voltage source converters with current prioritization schemes

Negative sequence support (NSS) functions are required during faults and unbalanced grid conditions in terms of power quality and grid support. During asymmetrical faults, the current limiting control (CLC) is essential for safe converter control. However, the chosen NSS function, the CLC design, and the grid-forming (GFM) control strategy are highly co-dependent and determine the overall fault-ride through (FRT) performance, which motivate the present comparative study.