Do PV inverters need AC side grounding?
When a PV plant is installed in the distribution feeder, the plant shall meet the IEEE standard and the interface requirements of the local utility company. Some utility companies require PV inverters to have AC side grounding in order to assure compatibility with their grounding scheme, generally referred to as effective grounding.
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.
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.
Are PV inverters current- regulated sources?
Modeling PV Inverters as Current-Regulated Sources. In , 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.
Can a PV inverter deenergize a distribution feeder?
To comply with standards established by the Institute of Electrical and Electronics Engineers (IEEE)—specifically, IEEE —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.
How does a PV inverter protect against a grid fault?
Protective relay functions are built directly into the PV inverter. A PV inverter does not have any mechanical inertia. During a grid fault condition, the inverter short circuit current is equivalent to its rated current and the inverter disables its operation within one or a few cycles.
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