Influence analysis of neutral point grounding mode on the single-phase grounding fault characteristics of distribution network with distributed generation

The amplitude and distribution of single-phase ground fault current in the original distribution network are affected by the access of distributed generation (DG). In addition to the access capacity of the DG, the influence of the neutral point grounding coordination mode and fault point location between the distribution network side and the DG side on the fault current is more significant and complex. The single-phase grounding fault of the DG after it is tied to the 10kV distribution network is analyzed, and the fault current amplitude and its distribution under different coordination modes of the distribution network side and the neutral point grounding of the DG side are discussed. The simulation results show that the change of the distribution network side grounding mode has little effect on the single-phase grounding fault current, which is mainly reflected in the change of the fault current amplitude, while the change of the distribution generation side grounding mode causes the change of the fault current amplitude and also affects the distribution of the fault current, which brings difficulties to the relay protection setting.