Analysis and Improvement of Active Arc Suppression Algorithm Considering Effect of Distribution Line Parameters

Abstract

Considering the influence of self impedance and phase-to-phase coupling of the distribution feeders, an analysis is made on the full-compensation zero-residual-current arc-suppression algorithms for the single-phase grounding faults of active inverters, and some ideas are proposed for their improvement. An equivalent injection current formula is derived for the active inverter based on full-compensation fault arc-suppression, which shows that the active arc-suppression injection current is determined by the faulted phase voltage and the zero-sequence input impedance at the fault position. Based on the analysis of the active-current and active-voltage arc-suppression algorithms, it is proposed to optimize active-current arc-suppression algorithm by correcting current flow through the arc-suppression coil, measuring the fault resistance and locating the fault section. The active voltage arc-suppression algorithm can be optimized by such methods as monitoring the load current and locating the single-phase grounding fault position. The results of this study can provide an important theoretical basis for improving the active arc suppression algorithms for single-phase grounding faults in the distribution networks.

Keywords

• distribution network
• arc suppression coil
• full compensation
• zero residual current
• active arc suppression