DC Series Arc Fault Detection and Self- Extinguishing Method With Power Stage Design of Module Level Power Electronics

A DC optimizer can achieve maximum power generation for each photovoltaic (PV) panel. However, it increases the possibility of arc fault between the PV panel and DC optimizer. This paper proposes the DC series arc fault detection and self-extinguishing method for the DC optimizer through the power stage design. The proposed method adopts the characteristics of series arc fault resistance according to the PV current. The relationship between the arc fault resistance and PV current is theoretically analyzed according to the parameter change of the passive components. The power stage analysis can determine the passive parameters, such as the inductor and capacitor, to detect faults and self-extinguish. The simulation and experimental results employing the boost-type DC optimizer verify the performance of the proposed arc fault detection and extinguishing method.