Impact of Distributed Generation on Distribution Systems Reliability considering Recloser-fuse Miscoordination-a Practical Case Study

摘要

Using Distributed Generation (DG) is an interesting topic that has drawn attention of electrical engineers in recent years. The presence of these generation units in distribution systems, although has many advantages and benefits, has to be applied after performing detailed studies and investigations due to their complexities in operation, control and protection of network. DGs are connected to distribution networks with the aim of reliability improving. On the other hand, installation of DG may destroy the protection coordination which causes the system reliability to become worse. This conflict has been investigated on a practical distribution system in Iran and the results have been presented. Because of the large number of temporary faults in the studied feeder and their long repair time, which is because of special recloser-fuse coordination scheme of the feeder, reliability analysis is done considering both permanent and temporary faults.