About Photovoltaic inverter AC abnormality
The central inverter is considered the most important core equipment in the Mega-scale PV power plant which suffers from several partial and total failures. This paper introduces a new methodology for Failure Causes Analysis (FCA) of grid-connected inverters based on the Faults Signatures Analysis (FSA).
The central inverter is considered the most important core equipment in the Mega-scale PV power plant which suffers from several partial and total failures. This paper introduces a new methodology for Failure Causes Analysis (FCA) of grid-connected inverters based on the Faults Signatures Analysis (FSA).
As DER become prevalent in the distribution system, equipment rating capability and coordination of protection systems merit a closer investigation. This report discusses issues and provides solutions for dealing with fault current contributions from inverter-based DER.
The power curve analysis identifies abnormal behaviors of the inverter, it also allows to check the status of the DC side. It could reduce the recurrent issues and identify the hidden failures in the power plant.
Arc fault detector (AFD) is a part of Arc fault circuit interrupter (AFCI). Apart from AFD, AFCI also have arc fault interrupting device. AFD detects abnormal frequencies (that may be due to arc fault) and Arc fault interrupting device disconnects the circuit in case of fault detected by the AFD [52].
In summary, the above five cases can explain in detail, that the grounding faults in PV modules have a serious impact on the AC side of the inverter. The adverse effects are third-harmonic voltage, the DC bias voltage and the CGCC.
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