Distributed Arc Suppression Strategy for Single-Line-to-Ground Faults in Distribution Networks Based on Cooperative Control of Multiple Power Routers

Traditional arc suppression devices for single-lineto-ground (SLG) faults in distribution networks often sufferfrom functional singularity, low utilization rates during non-faultconditions, and excessive capacity sizing requirements. To addressthese limitations, this paper proposes a distributed arc suppression strategy leveraging the cooperative control of multiple powerrouters (PRs). In steady-state operation, distributed PRs executeactive ground parameter compensation (AGPC) to dynamicallymitigate zero-sequence voltage offsets induced by three-phaseline-to-ground parameter asymmetry. Upon the occurrence ofan SLG fault, a voltage-current coordinated mechanism isactivated. Specifically, the current-controlled PR (CC-PR) servesas a current support unit by injecting adjustable currents toundertake the primary burden of fault current compensation.Simultaneously, a voltage-controlled PR (VC-PR) acts as a voltageclamping unit to ensure precise control of the residual voltage viaa unified voltage reference. This method facilitates the flexibleallocation of suppression capacity among multiple PRs, therebyeffectively alleviating individual capacity demands. The proposedstrategy is validated through MATLAB/Simulink simulations andhardware-in-the-loop (HIL) real-time results.