Practice Test GeeksSE Engr. - Solar Energy Engineering Certification Practice Test
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Energy Storage and Grid Integration Flashcards

7 cards from real SE ENGR. practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Energy Storage and Grid Integration flashcards as text

  1. Under a volt-VAR function, how does an inverter respond when local grid voltage rises above the reference?

    Answer: It absorbs reactive power

    Absorbing VARs lowers local voltage, counteracting the overvoltage.

  2. What does a frequency-watt function do when grid frequency rises above nominal?

    Answer: Reduces active power output

    Over-frequency indicates excess generation, so DER curtail active power to help restore balance.

  3. An inverter rated 100 kVA operating at 0.9 power factor can deliver at most how much real power?

    Answer: 90 kW

    Real power = apparent power x power factor = 100 kVA x 0.9 = 90 kW.

  4. What distinguishes a grid-forming inverter from a grid-following inverter?

    Answer: It establishes its own voltage and frequency reference

    Grid-forming inverters behave as voltage sources, setting voltage and frequency rather than following them.

  5. What is the main purpose of ramp-rate control in a PV-plus-storage plant?

    Answer: Smooth rapid output changes from cloud transients

    Storage absorbs or supplies power to limit how fast plant output changes, protecting grid stability.

  6. IEEE 1547-2018 limits a DER's total rated-current distortion (TRD) to what value?

    Answer: 5%

    IEEE 1547-2018 caps total rated-current distortion at 5% of rated current.

  7. The "duck curve" describes which grid challenge associated with high solar penetration?

    Answer: Midday net-load dip followed by a steep evening ramp

    Solar reduces midday net load, then demand must be met by a steep ramp as the sun sets.