Research On Line-protection Including Distributed Energy Generation

When distributed energy generation accessed to existing network, there will produce a negligible impacts such as power quality, line-loss, protection, etc. This research develops a line protection scheme containing distributed energy generation under the influence of distributed energy generation for the impact of distributed network relay protection. When the 10 kV distributed network accesses to multiple distributed energy generation, the study select one of the case to research the impact on each part of the distribution network. This distributed energy generation divided original distribution network into three parts and need to develop different protection schemes for each part.By analysis, a certain influence on the fault current after distributed energy generation accessed to distribution network and therefore corresponding two different protection operation setting should be set. O n the base of traditional three-current protection, this study makes appropriate adjustment on protection criterion for adj usting any kinds of fault. It is all known to us that traditional three-current protection will lose in some type of fault. Thus the study uses positive sequence, negative sequence and zero sequence of the fault current to form protection criterion. The criterion makes sure any faults have a certain protection range including two-phase short circuit.At last, this research models 10 kV distribution network simulation on PSCAD. After simulation analysis, the protection scheme will act on any types of fault.