Active Stability Enhancement of Grid-Connected Converter Clusters Considering the Impact of Internal Interaction and Converter Locations

This article proposes an emergency stability enhancement strategy leveraging postdisturbance multiconverter power coordination, specifically applicable to systems with unknown converter-level parameters. First, a single-feeder grid-connected system elected as the representative case study and a small-signal model is developed with explicit modeling of generation unit interactions. Based on this model, system stability trends under varying power allocation are analyzed. Subsequently, a hierarchical flexible stability enhancement strategy is proposed, which prioritizes ensuring that the total output of converters remains unchanged to avoid the o influence on the upper-level scheduling as much as possible and followed by further adjustment which will induce controlled total output variations. Finally, experimental results are presented to validate the efficacy of the proposed approach.