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Single greatest challenge is to address the possibility that DG will cause network protectors to open under non-fault conditions; for example, when DG output causes reverse power flows on network protector(s).

Whether the length of time required to analyze DG impacts is longer than radial systems due to greater complexity of network systems, particularly on grid networks with many primary feeders and secondary transformers.

Development of a generic standard for integration of DG presents potential challenges due to significant differences in network system design within and among utilities, particularly for grid systems that have evolved over time.

Similar to radial systems, need to ensure fault current contribution by DG does not exceed the fault duty ratings of primary and/or secondary equipment; for example, circuit breakers.

If clearing times for DG exceed those of the network protectors, need to address potential mis-coordination or de-sensitization of protection systems.

Identifying mitigation options for synchronous generators that potentially could remain on line and contribute fault current to primary and secondary faults.

There are challenges with interconnecting DG into spot and grid networks.

Network Interconnection Opportunities and Challenges

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