Technical FAQs 4

What if no load is connected to the inverter after a grid disconnect?

Scenarios where no load is connected to the inverter after the grid disconnects represent the theoretical worst case in terms of over-voltage magnitude, but in such cases there is no load to be damaged by any over-voltage. Hence testing here focuses primarily on scenarios where at least some load is present.

Is there a correlation between inverter power and over-voltage?

The inverter was tested at 100% inverter power and 10% load power to test a worst case loading scenario. There is possibly a positive correlation between the input voltage and the maximum output over-voltage, but the magnitude of the over-voltage is relatively low.

Does NREL have a test plan for inverter grid integration?

For this work, a test plan that is currently under development by the Forum on Inverter Grid Integration Issues (FIGII) has been implemented in a custom test setup at NREL. A later report describing results of GFO testing will follow.

Do distributed generation inverters mitigate transient and temporary overvoltage?

M. E. Ropp, M. Johnson, D. Schutz, and S. Cozine, “Effective grounding of distributed generation inverters may not mitigate transient and temporary overvoltage,” presented at the Western Protective Relay Conference, 2012. R. Bravo and S. Robles, “Residential Solar PV Inverter Test Report,” Southern California Edison, Dec. 2013.

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