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Energy Storage and Grid Integration Flashcards

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  1. What is the primary scope of IEEE 1547-2018?

    Answer: Interconnection and interoperability of DER with electric power systems

    IEEE 1547-2018 defines technical requirements for interconnecting distributed energy resources to the grid.

  2. UL 1741 Supplement SB certifies inverters against which test standard for grid-support functions?

    Answer: IEEE 1547.1-2020

    UL 1741 SB uses IEEE 1547.1-2020 test procedures to verify IEEE 1547-2018 grid-support capabilities.

  3. Under IEEE 1547, within what time must a DER cease to energize after an unintentional island forms?

    Answer: 2 seconds

    IEEE 1547 requires detection and cessation of energization within 2 seconds of island formation.

  4. Per NEC 705.12 (120% rule), a 200 A busbar with a 200 A main breaker allows a maximum backfed PV breaker of:

    Answer: 40 A

    1.2 x 200 A = 240 A, minus the 200 A main leaves 40 A for the PV breaker.

  5. When applying the 120% rule, where must the backfed PV breaker be located on the panelboard?

    Answer: At the opposite end of the busbar from the main breaker

    Placing it at the opposite end prevents busbar sections from carrying more than their rating.

  6. Which IEEE 1547-2018 abnormal performance category has the most robust voltage and frequency ride-through requirements?

    Answer: Category III

    Category III targets high-DER-penetration areas and requires the widest ride-through capability.

  7. Which NEC article specifically covers energy storage systems?

    Answer: Article 706

    NEC Article 706 addresses installation of energy storage systems, while 690 covers PV and 705 interconnections.