Photovoltaic inverter AC voltage 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).
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].
Three factors mainly involve in the disconnection of PV inverter when a fault occurs: 1) loss of grid voltage synchronization, 2) enormous AC current, and 3) excessive DC-link voltage. To fulfill the FRT standard requirements and keep the PV system connected to the grid, when a fault occurs two key problems should be addressed by the PV system.
Firstly, it is analysed that the grounding fault in PV modules will cause an adverse impact for the PV inverter system such as the third-harmonic voltage, the DC bias voltage and the CGCC. Secondly, instead of searching the faulty location with algorithms and separating the faulty section out, this paper proposes a control strategy to continue .
photovoltaic (PV) inverters address new advanced grid support functions (GSFs), there is increasing interest in inverter perfor- mance in the case of abnormal grid conditions.
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