Technical FAQs 4

What is effective grounding in photovoltaic (PV) systems?

Effective grounding in photovoltaic (PV) systems is the creation of a low-impedance reference to ground at the AC side of the inverter—or group of inverters—that is designed to be compatible with the distribution network’s requirements and existing grounding scheme.

Are PV inverters current- regulated sources?

Modeling PV Inverters as Current-Regulated Sources. In 2017, IEEE approved a sixth part to IEEE C62.92 Guide for Application of Neutral Grounding in Electrical Utility Systems—Part VI: Systems Supplied by Current-Regulated Sources.

What is a PV inverter?

Unlike generators, PV inverters are current limited power sources protected by built-in relay functions that can disconnect within a few cycles of detecting abnormal grid operation. Some variables in conventional IEEE effective grounding calculations are not defined for PV inverters.

Can a PV inverter deenergize a distribution feeder?

To comply with standards established by the Institute of Electrical and Electronics Engineers (IEEE)—specifically, IEEE 1547—PV inverters connected to the grid will deenergize the distribution feeders immediately during certain abnormal grid operation scenarios, including grid line-to-ground faults and loss of a line.

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