Revision of IEEE Standard 1547 Additional Topics

Foreshadowing IEEE Std. 1547-2018, this article by the National Rural Electric Cooperative Association (NRECA) discusses many changes in the standard that are expected to affect utility interconnection decisions and practices.

This article is the fourth and final of the NRECA series on the standard.


Revision of IEEE Standard 1547 Additional Topics (Walling 2017)
This article highlights a host of topics not previously covered and which are not strongly related to each other. Stakeholders seeking an overview of the new and unique terminology of the standard, a technical overview of islanding requirements, or power quality limitations will find this article useful.

Topics Covered

  • Unique terminology used in the standard
  • Feeder island and recloser coordination
  • Intentional islands, including "utility microgrids"
  • Power quality
  • Data communications and interoperability
  • Distributed energy resource testing and evaluation

Key Takeaways

Utility Microgrids

"Utility microgrids"—known as intentional Area EPS islands in the standard—are where an intentional island is formed around a utility substation and its feeders, or a single feeder or portion of a feeder. Where utilities choose to implement this capability, or are being required to be regulators or other entities, for reliability or resilience purposes, the standard addresses the special requirements involved, and then only when the intentional island is isolated from the Area EPS.

Power Quality

IEEE Std. 1547-2018 makes the requirements for power quality more explicit and quantitative, which facilitate enforcement of the requirements with less ambiguity. Quantitative limits for flicker, rapid voltage changes, interharmonics, and transient overvoltage are discussed and contrasted with prior versions of the standard.