The analysis of distributed generation influence on feeder protection

This paper studies that the influence of the distributed power access to radial distribution network to power feeder protection and uses Matlab/simulink to establish the corresponding model of power distribution network and containing DG. According to different capacity of DG and access to different positions, the influence of the DG to the distribution feeders short-circuit current distribution and quick break current protection is analyzed in distributed power. Analysis results show that the greater capacity of DG units, the greater impact of the original feeder protection. When DG in the upstream of feeder protection, DG will help increase the scope of protection. On the contrary, when DG access to the downstream of protection, DG generates shunting effect which decreases the scope of protection, so the original protection need install direction components.